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<title>وبلاگ تخصصی آنالیز مودال</title>
<link>http://modal-analysis.blogfa.com/</link>
<description></description>
<language>fa</language>
<generator>blogfa.com</generator>
<lastBuildDate>Sat, 19 Dec 2009 09:51:18 GMT</lastBuildDate>
<item>
<title>لینک دانلود کتاب  Kreyszig و حل المسایل</title>
<link>http://modal-analysis.blogfa.com/post-18.aspx</link>
<description>&lt;FONT color=#cc0099&gt;کتاب Kreyszig:&lt;/FONT&gt;
&lt;P&gt;&lt;/P&gt;
&lt;P&gt;&lt;A href=&quot;http://www.4shared.com/file/176471467/f4b1ebea/Advanced_Engineering_Mathemati.html&quot; target=_blank&gt;Advanced Engineering Mathematics (9th Edition, 2006) - Kreyszig &lt;/A&gt;&lt;BR&gt;&lt;/P&gt;
&lt;P&gt;&lt;FONT color=#cc0000&gt;حل المسایل:&lt;/FONT&gt;&lt;/P&gt;
&lt;P&gt;&lt;/P&gt;
&lt;P&gt;&lt;A href=&quot;http://www.4shared.com/file/176507654/19066d94/Advanced_Engineering_Mathemati.html&quot; target=_blank&gt;Advanced Engineering Mathematics 9ed by Erwin Kreyszig(Even-numbered Problems Solutions 416s)&lt;/A&gt;&lt;/P&gt;</description>
<pubDate>Sat, 19 Dec 2009 09:51:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=18</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-18.aspx</guid>
</item>
<item>
<title>تمرین درس برنامه نویسی</title>
<link>http://modal-analysis.blogfa.com/post-16.aspx</link>
<description>
بعلت درخواست دانشجویان، با توجه به امتحانات میان ترم، این هفته تمرین ارائه نخواهد شد.
</description>
<pubDate>Sun, 23 Nov 2008 09:10:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=16</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-16.aspx</guid>
</item>
<item>
<title>روش  تخمین پارامترهای مودال در OMA</title>
<link>http://modal-analysis.blogfa.com/post-15.aspx</link>
<description>
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&lt;p class=&quot;MsoNormal&quot; dir=&quot;rtl&quot; style=&quot;text-align: right; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;ساده ترین روش به منظور تخمین پارامترهای مودال در &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; روش &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Peak-picking&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; می باشد. فرکانس های طبیعی از طریق
در نظر گرفتن قله های نمودار های طیف قدرت (&lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Power spectral function&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;) به دست می آیند. نقص فرضیات اساسی
(دمپینگ پایین، فرکانس های طبیعی کاملا جدا از هم) منجر به پاسخ های پرخطا در این
روش می گردد. در حقیقت روش شکل های انحرافی محیطی (&lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;operational deflection shapes&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;) را به جای شکل مودها مشخص می کند و
برای مودهای نزدیک به هم مانند یک شکل انحرافی محیطی، انطباق چندین مود خواهد بود.
مشکل دیگر این است که انتخاب فرکانس های طبیعی کار تقریبا دستی است و همچنین این
روش راهبردی برای تخمین دمپینگ ندارد.&lt;o:p /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p class=&quot;MsoNormal&quot; dir=&quot;rtl&quot; style=&quot;text-align: right; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;روش دیگر و البته پیشرفته تر از محاسبه &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;SVD&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; ماتریس های خودهمبستگی و همبستگی
متقاطع طیفی بین خروجی ها استفاده می کند. این روش در منابع مختلف مورد بحث قرار
گرفته است و دارای نام های متفاوتی می باشد. مشهور ترین نام آن &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Frequency Domain Decomposition&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; یا تجزیه حوزه فرکانسی می باشد. دیگر
نام های این روش عبارتند از ؛ &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Principal
Component Analysis&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; (&lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;PCA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;)
، &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Complex Mode Indication Function&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; (&lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;CMIF&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;) . این روش قادر است تعدد مودها
(مودهای مختلف در یک فرکانس) را تشخیص دهد. اما همچنان یک روش نسبتا فردی &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Subjective&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; است. روش های&lt;span&gt; &lt;/span&gt;&lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;PP&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; و
بر پایه &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;SVD&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;
هر دو از روش های غیر پارامتریک محسوب می شوند. در این روش ها فرکانس های ویژه با
نگاه کردن به مشخصه های بر پایه سیگنال بدون فیت کردن و یا تخمین یک مدل پارامتریک
تعیین می شوند. &lt;o:p /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p class=&quot;MsoNormal&quot; dir=&quot;rtl&quot; style=&quot;text-align: right; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;یک روش جالب و پیشرفته تر برای &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Peak-picking &lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span&gt; &lt;/span&gt;روش &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Stochastic subspace identification&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; یا همان &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;SSI&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; می باشد. در روش &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;SSI&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; یک مدل به اصطلاح فضای حالت اتفاقی
مستقیما از داده های خروجی اندازه گیری شده یا همبستگی خروجی ها مشخص می شود. می
توان نشان داد که یک مدل فضای حالت اتفاقی، یک ارائه خوب از ارتعاشات سازه های
تحریک شده توسط نیروهای ناشناخته است، که فرض می شود ورودی سیستم به صورت نویز
سفید است. &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;o:p /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p class=&quot;MsoNormal&quot; dir=&quot;rtl&quot; style=&quot;text-align: right; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;پیشرفت های مهم &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; در موضوعات زیر حاصل شده است&lt;/span&gt;&lt;span dir=&quot;ltr&quot;&gt;&lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;ltr&quot;&gt;&lt;/span&gt;.&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; &lt;span lang=&quot;FA&quot;&gt;&lt;o:p /&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;

&lt;ul&gt;&lt;li&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; در حوزه زمان، روش های &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;NExT-type &lt;/span&gt;&lt;/li&gt;&lt;li&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; در حوزه زمان، روش های &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;ARMA-type&lt;o:p /&gt;&lt;/span&gt;&lt;/li&gt;&lt;li&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; در حوزه زمان، روش های &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Stochastic Realization-based &lt;/span&gt;&lt;/li&gt;&lt;li&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; در حوزه زمان، روش های &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;Stochastic Subspace-based&lt;o:p /&gt;&lt;/span&gt;&lt;/li&gt;&lt;li&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; در حوزه فرکانس، روش های &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;FDD-Type&lt;/span&gt;&lt;/li&gt;&lt;li&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; در حوزه فرکانس، روش های &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%; font-family: tahoma,arial,helvetica,sans-serif;&quot;&gt;LSCF-type&lt;/span&gt;&lt;/li&gt;&lt;/ul&gt;مهندس ملک جعفریان&lt;br /&gt;

&lt;/div&gt;
</description>
<pubDate>Tue, 09 Sep 2008 11:25:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=15</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-15.aspx</guid>
</item>
<item>
<title>مزیت های OMA </title>
<link>http://modal-analysis.blogfa.com/post-13.aspx</link>
<description>
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   UnhideWhenUsed=&quot;false&quot; Name=&quot;Colorful Shading Accent 3&quot;/&gt;
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&lt;p class=&quot;MsoNormal&quot; dir=&quot;rtl&quot; style=&quot;text-align: right; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;اما از جمله مزیت های &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; را می توان چنین نام برد:&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;

&lt;ul&gt;&lt;li&gt;&lt;font size=&quot;1&quot;&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; ارزان است و با سرعت زیادی
     انجام می گیرد. زیرا به تجهیزات پیچیده تحریک و شرایط مرزی شبیه سازی شده
     نیاز ندارد. &lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;1&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;مشخصه های دینامیکی سیستم کامل به جای ترکیب در نقاط
     بیشتری به دست می آید.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;1&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;مشخصه های مدل تحت بارگذاری واقعی در تحریکات با باند
     تصادفی پهن خطی خواهد بود.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;1&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;تمامی و یا بخشی از نقاط می تواند به عنوان مرجع
     استفاده شود. بنابراین الگوریتم مورد استفاده برای &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; می بایست از نوع &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;MIMO&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; باشد. در نتیجه مودهای نزدیک هم
     یا حتی مودهای تکراری به راحتی تشخیص داده می شوند که برای سازه های واقعی
     مختلط مناسب می باشد.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;1&quot;&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; نه تنها برای طراحی دینامیکی،
     کنترل سازه استفاده می شود بلکه برای &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;vibration-based health monitoring&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; و &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;damage detection&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; سازه ها مورد استفاده قرار می
     گیرد. &lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;1&quot;&gt;&lt;span lang=&quot;AR-SA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;سازه
     هاي بزرگ نظير پل و ساختمانها ميتوانند توسط نيروي باد، بار ترافيکي و امواج
     صوتي تحريک شوند، و در سيتمهاي مکانيکي نظير خودروها تحريک ميتواند ؛ بار
     گذازي آيروديناميکي ، تحريک تجهيزات خود سيستم ، ارتعاشات ناشي از جاده و ريل
     باشد . &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;AR-SA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; از اين نيروها
     براي تحريک سازه استفاده ميکند ، و به کمک متوسط گيري و يا فيلترينگ سعي در
     حذف نويزهاي محيطي مي کند.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;1&quot;&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;AR-SA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; خصوصيات مودال سيستم را در حين کار بدست مي آورد. حتي اگر
     سيتم را بتوان در شرايط آزمايشگاه قرار داد و &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;EMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;AR-SA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span&gt; &lt;/span&gt;را بر روي آن ايجاد
     کرد باز هم نميتوان حتي با تحريک هوشمندانه تحريکي همراه با اغتشاش ، سطح و
     نوع تحريکات موجود در محل کار ايجاد کرد&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;1&quot;&gt;&lt;span lang=&quot;AR-SA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;بيشتر
     سيستمها از خود خواص غير خطي نشان ميدهند ، بنابراي خصوصيات مودال بدست آمده
     از روش &lt;/span&gt;&lt;span dir=&quot;ltr&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;EMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;AR-SA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span&gt; &lt;/span&gt;نميتواند ارتباط دقيقي با آن خصيات در
     محيط کاري داشته باشد . بنابراين آنها را خصوصيات مودال کاري مينامند ، که
     داراي اهميت&lt;span&gt; &lt;/span&gt;بسياري ميباشد.&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;مهندس ملک جعفریان&lt;br /&gt;

</description>
<pubDate>Tue, 09 Sep 2008 10:49:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=13</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-13.aspx</guid>
</item>
<item>
<title>معرفی آنالیز مودال محیطی</title>
<link>http://modal-analysis.blogfa.com/post-12.aspx</link>
<description>
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   UnhideWhenUsed=&quot;false&quot; Name=&quot;Light List Accent 6&quot;/&gt;
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   UnhideWhenUsed=&quot;false&quot; Name=&quot;Medium List 2 Accent 6&quot;/&gt;
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   UnhideWhenUsed=&quot;false&quot; Name=&quot;Medium Grid 1 Accent 6&quot;/&gt;
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   UnhideWhenUsed=&quot;false&quot; Name=&quot;Medium Grid 2 Accent 6&quot;/&gt;
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   UnhideWhenUsed=&quot;false&quot; Name=&quot;Medium Grid 3 Accent 6&quot;/&gt;
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   UnhideWhenUsed=&quot;false&quot; Name=&quot;Dark List Accent 6&quot;/&gt;
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   UnhideWhenUsed=&quot;false&quot; Name=&quot;Colorful Shading Accent 6&quot;/&gt;
  &lt;w:LsdException Locked=&quot;false&quot; Priority=&quot;72&quot; SemiHidden=&quot;false&quot;
   UnhideWhenUsed=&quot;false&quot; Name=&quot;Colorful List Accent 6&quot;/&gt;
  &lt;w:LsdException Locked=&quot;false&quot; Priority=&quot;73&quot; SemiHidden=&quot;false&quot;
   UnhideWhenUsed=&quot;false&quot; Name=&quot;Colorful Grid Accent 6&quot;/&gt;
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 &lt;/w:LatentStyles&gt;
&lt;/xml&gt;&lt;![endif]--&gt;&lt;style&gt;
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ol
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ul
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--&gt;
&lt;/style&gt;&lt;!--[if gte mso 10]&gt;
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&lt;![endif]--&gt;

&lt;p style=&quot;margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;در سال های اخیر، روش جدیدی در کاربرد آنالیز مودال ظهور
کرده است. این روش &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;operational modal
analysis&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; نامیده می شود. به نظر می رسد صنعت در این خصوص بر روی لبه دوران
جدیدی ایستاده است، که به کاربردهای جدید به منظور فعالیت های حرفه ای در حوزه صوت
و ارتعاشات می پردازد.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p style=&quot;margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;آنالیز مودال همانگونه که در فصل پیش نیز اشاره شد به طور
وسیعی کاربرد دارد. آنالیز مودال سنتی &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;EMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; از ورودی (تحریک) و خروجی (پاسخ) به منظور تخمین پارامترهای مودال
استفاده می کند. این پارامترها شامل، فرکانس های مودال، نسبت های دمپینگ، شکل
مودها و فاکتورهای مشارکت پذیری مودال می باشند. در هر حال آنالیز مودال سنتی برخی
محدویت هایی دارد :&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p style=&quot;margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;o:p&gt; &lt;/o:p&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;

&lt;!--[if !supportLists]--&gt;&lt;ul style=&quot;font-family: tahoma,arial,helvetica,sans-serif;&quot;&gt;&lt;li&gt;&lt;font size=&quot;2&quot;&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span&gt;&lt;span&gt; &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;در آنالیز مودال سنتی &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;EMA&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; معمولا از تحریک مصنوعی به منظور
اندازه گیری توابع پاسخ فرکانسی (&lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;FRFs&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;)
یا توابع پاسخ ضربه (&lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;IRFs&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;)
استفاده می شود. بسیار مشکل یا حتی غیر ممکن می باشد که این توابع را در فضای تست
یا در سازه های بزرگ محاسبه نمود.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;2&quot;&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span&gt;&lt;span&gt; &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;آنالیز مودال سنتی به محیط آزمایشگاه محدود می شود. در هر
حال در بسیاری از کاربردهای صنعتی، شرایط عملی واقعی به وضوح متفاوت از شرایطی است
که در آزمایشگاه وجود دارد.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;2&quot;&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span&gt;&lt;span&gt; &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;اغلب در آزمایشگاه یک ترکیب به جای سیستم کامل تست می شود،
و شرایط مرزی می بایست به شکل قابل قبولی شبیه سازی شود.&lt;span&gt; &lt;/span&gt;&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;2&quot;&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span&gt;&lt;span&gt; &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span lang=&quot;AR-SA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;سختي
تحريک سازه هاي بزرگ ، بويژه درسازه هاي مهندسي عمران&lt;span&gt; &lt;/span&gt;مانند&lt;span&gt; &lt;/span&gt;پل و ساختمانها.&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font size=&quot;2&quot;&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span&gt;&lt;span&gt; &lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span lang=&quot;AR-SA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;غيرخطي
بودن بسياري از سيستمها و سختي ايجاد تحريک چنين سيتمهايي.&lt;/span&gt;&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;!--[endif]--&gt;&lt;!--[if !supportLists]--&gt;&lt;!--[endif]--&gt;&lt;!--[if !supportLists]--&gt;&lt;!--[endif]--&gt;&lt;!--[if !supportLists]--&gt;&lt;!--[endif]--&gt;&lt;!--[if !supportLists]--&gt;&lt;!--[endif]--&gt;









&lt;p style=&quot;margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;o:p&gt; &lt;/o:p&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p style=&quot;margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; نام تکنیکی است برای انجام آنالیز
مودال روی داده های محیطی، جایی که سازه را به صورت مصنوعی تحریک نمی کنیم، بلکه
اجازه می دهیم بارهای طبیعی سازه را تحریک کنند. به همین دلیل نام های جدید برای
این حوزه از آنالیز مودال در حال پدیدار شدن هستند. نام هایی مانند، آنالیز مودال
محیطی (&lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;ambient modal analysis&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;)
، آنالیز مودال ورودی طبیعی (&lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;natural
input modal analysis&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;) و همچنین نام معمول تنها خروجی (&lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;output-only modal analysis&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;). به خاطر غلط اندازی که ظاهرا در
نام آخر وجود دارد، در سال های اخیر تلاش می شود از نام تنها خروجی استفاده نشود.
زیرا ممکن است این برداشت را ایجاد&lt;span&gt; &lt;/span&gt;کند که
در این نوع آنالیز ورودی نداریم، که برداشت غلطی است. در واقع، ورودی های طبیعی و
ذاتی در سیگنال های خروجی وجود دارند، اما به نحوی که در آنالیز مودال سنتی &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;EMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; این ورودی ها روشن هستند، در این
تکنیک ها روشن نیستند.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p style=&quot;margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;در روزهای نخستین که محققین کار خود را در حوزه آنالیز
مودال آغاز کردند، ایده &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; و
اینکه چگونه می توان در مواردی که ورودی ها دقیقا شناخته شده نیستند، اطلاعات
مودال را به دست آورد، در کلیه تفکرات وجود داشت. محققان از این مسئله آگاهی
یافتند و بسیاری از مقالات قدیمی با این نمونه ها سرو کار داشتند. بحث ها در خصوص
ورودی ها شروع شد و این نتیجه حاصل شد که با دانستن ورودی ها دیگر نیاز به تخمین
آنها نیست. در ادامه محققان در مورد &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;SISO&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;، &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;SIMO&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; و &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;MIMO&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; ( یک ورودی یک خروجی، یک ورودی چند
خروجی و چند ورودی چند خروجی) بحث کردند. در این فرآیند &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; به جز در موارد اندکی که با سازه های
بزرگ سرو کار داشتند، مورد فراموشی واقع شد. از آغاز دهه 1970 تا اواخر دهه 1990
برخی پیشرفت ها در زمینه &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;
اتفاق افتاد، اما در کاربرد با شکست مواجه شد. اما اینکه دلیل این شکست چه بود،
شاید به این دلیل که صنعت دچار فقدان تجهیزات قابل قبول بود.&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p style=&quot;margin-bottom: 0.0001pt; text-align: justify; line-height: 150%; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;در حوالی سال 2000 میلادی شرکت های نرم افزاری مختلف شروع
به توسعه ابزارهای مختلف برای &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;
کردند و کم کم به نقطه ای رسید که اکنون &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 150%;&quot; dir=&quot;ltr&quot;&gt;OMA&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 150%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; به یک تکنولوژی قابل قبول تبدیل شده است. اکنون کنفرانس های
فراوانی وجود دارند که منحصرا به این موضوع پرداخته اند و نرم افزارهای گوناگونی
در این زمینه وجود دارد.&lt;span&gt; &lt;/span&gt;&lt;o:p /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;

&lt;p style=&quot;text-align: right; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;در اوایل دهه 1990&lt;span&gt; &lt;/span&gt;آنالیز مودال عملیاتی &lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 115%;&quot; dir=&quot;ltr&quot;&gt;operational
modal analysis&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; در مهندسی عمران در کاربردهایی مانند اسکله های دریایی، ساختمان
ها، برج ها، پل ها و...&lt;span&gt; &lt;/span&gt;به شکل وسیعی مورد
توجه قرار گرفت.&lt;/span&gt;&lt;span dir=&quot;ltr&quot;&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 115%;&quot; dir=&quot;ltr&quot;&gt;&lt;span dir=&quot;ltr&quot;&gt;&lt;/span&gt; OMA &lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span&gt; &lt;/span&gt;برای مهندسین
مکانیک و هوافضا نیز بسیار جذاب است.&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;&lt;p style=&quot;text-align: right; direction: rtl; unicode-bidi: embed; font-family: tahoma,arial,helvetica,sans-serif;&quot; dir=&quot;rtl&quot; class=&quot;MsoNormal&quot;&gt;&lt;font size=&quot;2&quot;&gt;مهندس ملک جعفریان&lt;/font&gt;&lt;br /&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt; line-height: 115%;&quot;&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 10pt; line-height: 115%;&quot; dir=&quot;ltr&quot;&gt;&lt;o:p /&gt;&lt;/span&gt;&lt;/p&gt;

</description>
<pubDate>Tue, 09 Sep 2008 10:42:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=12</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-12.aspx</guid>
</item>
<item>
<title>ARTeMIS Testor </title>
<link>http://modal-analysis.blogfa.com/post-11.aspx</link>
<description>
&lt;p align=&quot;left&quot; dir=&quot;ltr&quot;&gt;&lt;font color=&quot;#0066ff&quot;&gt;Data Upload &amp; Preliminary Modal Analysis&lt;/font&gt;&lt;br /&gt;&lt;br /&gt;The typical data upload is through the SVS Configuration File that encapsulates geometry, DOF information and references to the measurement files. When upload is complete an automatic preliminary modal analysis can be selected by a single click on a button.&lt;/p&gt;
&lt;p align=&quot;center&quot; dir=&quot;ltr&quot;&gt;&lt;img hspace=&quot;0&quot; border=&quot;0&quot; src=&quot;http://i38.tinypic.com/2npqbp.jpg&quot; /&gt;&lt;/p&gt;
&lt;p align=&quot;center&quot; dir=&quot;ltr&quot;&gt;&lt;img hspace=&quot;0&quot; border=&quot;0&quot; src=&quot;http://i35.tinypic.com/8wl0u1.jpg&quot; /&gt;&lt;/p&gt;
&lt;p align=&quot;left&quot; dir=&quot;ltr&quot;&gt;&lt;font face=&quot;arial, helvetica, sans-serif&quot; color=&quot;#0099ff&quot;&gt;The major features are:&lt;/font&gt;&lt;/p&gt;

&lt;ul style=&quot;direction: ltr; text-align: left;&quot;&gt;&lt;li&gt;&lt;font face=&quot;arial, helvetica, sans-serif&quot;&gt;Import measurements from a wide range of file formats, including ASCII files, Universal File Formats and Wave files. &lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font face=&quot;arial, helvetica, sans-serif&quot;&gt;Unlimited number of channels and data points can be uploaded. &lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font face=&quot;arial, helvetica, sans-serif&quot;&gt;Draw a suitable test geometry inside the software or import one from a file. &lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font face=&quot;arial, helvetica, sans-serif&quot;&gt;Assign DOF information easily using drag and drop. &lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font face=&quot;arial, helvetica, sans-serif&quot;&gt;Inspect the data before using it for post analysis in e.g. ARTeMIS &lt;i&gt;Extractor&lt;/i&gt;. &lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font face=&quot;arial, helvetica, sans-serif&quot;&gt;Control selected data acquisition systems directly inside the software. &lt;/font&gt;&lt;/li&gt;&lt;li&gt;&lt;font face=&quot;arial, helvetica, sans-serif&quot;&gt;Export all collected data (measurements, geometry and DOF information) to ARTeMIS &lt;i&gt;Extractor&lt;/i&gt; by a click on a button, or to popular file formats like Universal File Format.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;











Refrence:  &lt;a href=&quot;http://www.svibs.com/&quot;&gt;Structural Vibration Solutions A/S Co&lt;/a&gt;.</description>
<pubDate>Sat, 30 Aug 2008 08:40:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=11</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-11.aspx</guid>
</item>
<item>
<title>ARTeMIS Extractor</title>
<link>http://modal-analysis.blogfa.com/post-10.aspx</link>
<description>&lt;P dir=ltr align=left&gt;&lt;FONT face=Arial&gt;The ARTeMIS modal software is an open, and user friendly platform for modal testing, modal analysis and modal problem solving. If you can measure the vibrations, ARTeMIS &lt;I&gt;Extractor&lt;/I&gt; can give you the modes in terms of mode shape, natural frequency and damping ratio. &lt;/FONT&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;&lt;FONT size=2&gt;The new automatic mode estimation feature, available in all versions of new release ARTeMIS &lt;I&gt;Extractor&lt;/I&gt; 2008, makes it easier than ever before to perform operational modal analysis. &lt;BR&gt;&lt;BR&gt;No matter if you have small or extreme channel counts, pure ambient excitation or excitation mixed with harmonic signals, the new algorithm provides fast and reliable results of natural frequencies, damping ratios and mode shapes in a matter of seconds.&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;
&lt;P dir=ltr align=center&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;&lt;IMG alt=&quot;&quot; hspace=0 src=&quot;http://i38.tinypic.com/20p63kl.jpg&quot; align=baseline border=0&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;SPAN style=&quot;FONT-FAMILY: Arial&quot;&gt;
&lt;P dir=ltr align=left&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; COLOR: #0066ff; FONT-FAMILY: Tahoma&quot;&gt;Refrence:&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Tahoma&quot;&gt;  &lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial&quot;&gt;&lt;A href=&quot;http://www.svibs.com/&quot;&gt;Structural Vibration Solutions A/S Co.&lt;/A&gt;&lt;/SPAN&gt;&lt;/FONT&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt; &lt;/FONT&gt;&lt;/P&gt;&lt;/SPAN&gt;</description>
<pubDate>Sat, 30 Aug 2008 08:29:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=10</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-10.aspx</guid>
</item>
<item>
<title>Application of Operational Modal Analysis</title>
<link>http://modal-analysis.blogfa.com/post-9.aspx</link>
<description>&lt;P dir=ltr align=left&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Tahoma&quot;&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;There are many applications where Operational Modal Analysis is the natural choice of technology for supplying structural information.&lt;SPAN style=&quot;COLOR: #0066ff&quot;&gt;&lt;?xml:namespace prefix = o ns = &quot;urn:schemas-microsoft-com:office:office&quot; /&gt;&lt;o:p&gt;&lt;/o:p&gt;&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; COLOR: #0066ff; FONT-FAMILY: Tahoma&quot;&gt;Nondestructive testing&lt;BR&gt;&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Tahoma&quot;&gt;In non-destructive testing, NDT, the objective typically is to monitor the health of a structure over time. For this reason it is also known as Structural Health Monitoring, SHM. Since the structure is observed during service no other modal tool can provide modal information in such a case.&lt;o:p&gt;&lt;/o:p&gt;&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; COLOR: #0066ff; FONT-FAMILY: Tahoma&quot;&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;Damage Detection&lt;/FONT&gt;&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Tahoma&quot;&gt;&lt;BR&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;For many years Operational Moda Analysis has been the preferred tool in damage detection of large structures. Mode shapes has been used to identify local damages that caused curvature changes and e.g. the modal frequencies has been used to identify global damages. Research is still extensive in this area combining technologies such as modal analysis, neural networks or response surfaces, and stochastic decision theory.&lt;o:p&gt;&lt;/o:p&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; COLOR: #0066ff; FONT-FAMILY: Tahoma&quot;&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;Vibration Level Documentation&lt;/FONT&gt;&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Tahoma&quot;&gt;&lt;BR&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;If the vibration level needs to be documented in locations where no measurements can be made, Operational Modal Analysis can do it if you have a Finte Element Model, FEM, available. From the modal test you will obtain the modal coordinates or modal response at some measurable locations. These modal responses will then be extrapolated to other unmeasured locations through the mode shapes of the FE model, and by superposition the actual responses at the location is estimated. Even though the FE models only return normal modes this extrapolation will be good most structures.&lt;o:p&gt;&lt;/o:p&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; COLOR: #0066ff; FONT-FAMILY: Tahoma&quot;&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;Fatigue&lt;STRONG&gt;&lt;SPAN style=&quot;FONT-FAMILY: Tahoma&quot;&gt; &lt;/SPAN&gt;&lt;/STRONG&gt;Analysis&lt;/FONT&gt;&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Tahoma&quot;&gt;&lt;BR&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;The above mentioned vibration level documentation can also be extended to estimate the accumulated damage at unmeasured location such as underwater joints etc. In this way, ordinary inspections at e.g. offshore facilities can be optimized, since a few measurement points can give the engineers valuable fatigue estimates to help in the inspection planning.&lt;o:p&gt;&lt;/o:p&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; COLOR: #0066ff; FONT-FAMILY: Tahoma&quot;&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;Scaled Mode Shapes&lt;/FONT&gt;&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Tahoma&quot;&gt;&lt;BR&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;The drawback of Operational Modal Analysis has been that the mode shape scaling has been arbitrary causing incorrect modal participation factors. This has caused problems in applications such as response simulation and structural modification. Recently, however, techniques to obtain the right scaling has been developed and they are now being tested on full scale structures. The results of these tests indicates that for even larger structures it is possible to obtain an accurate Frequency Response Function, FRF, from response measurements only.&lt;o:p&gt;&lt;/o:p&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; COLOR: #0066ff; FONT-FAMILY: Tahoma&quot;&gt;Refrence:&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Tahoma&quot;&gt;  &lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial&quot;&gt;&lt;A href=&quot;http://www.svibs.com/&quot;&gt;Structural Vibration Solutions A/S Co.&lt;/A&gt;&lt;/SPAN&gt;&lt;/FONT&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt; &lt;/FONT&gt;&lt;/P&gt;</description>
<pubDate>Sat, 30 Aug 2008 08:00:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=9</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-9.aspx</guid>
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<title>Benefits of OMA Compared to Traditional Modal Analysis</title>
<link>http://modal-analysis.blogfa.com/post-8.aspx</link>
<description>&lt;P class=MsoNormal style=&quot;MARGIN: 0cm 0cm 0pt; DIRECTION: ltr; unicode-bidi: embed; TEXT-ALIGN: left; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto&quot;&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial&quot;&gt;There are a number of benifits in using the Operational Modal Analysis compared to the more traditional techniques. &lt;/SPAN&gt;&lt;/P&gt;
&lt;P class=MsoNormal style=&quot;MARGIN: 0cm 0cm 0pt; DIRECTION: ltr; unicode-bidi: embed; TEXT-ALIGN: left; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto&quot;&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial&quot;&gt;&lt;/SPAN&gt; &lt;/P&gt;
&lt;P class=MsoNormal style=&quot;MARGIN: 0cm 0cm 0pt; DIRECTION: ltr; unicode-bidi: embed; TEXT-ALIGN: left; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto&quot;&gt;&lt;SPAN style=&quot;FONT-SIZE: 9pt; COLOR: #0067b3; FONT-FAMILY: Verdana&quot;&gt;Multiple Input Multiple Output Modal Technology&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial&quot;&gt;&lt;BR&gt;The Operational Modal Analysis are Multiple Input Multiple Output, MIMO, techniques. This means that the techniques are capable of estimating closely space modes and even repeated modes with a high degree of accuracy. Traditional modal anlysis techniques are typically Single Input Multiple Output, SIMO, or Multiple Input Single Output, MISO, or in the worst case even Single Input Single Output, SISO. Such testing procedures will not be able to find repeated poles due to the lack of mode seperation.&lt;/SPAN&gt;&lt;/P&gt;
&lt;P class=MsoNormal style=&quot;MARGIN: 0cm 0cm 0pt; DIRECTION: ltr; unicode-bidi: embed; TEXT-ALIGN: left; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto&quot;&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial&quot;&gt;&lt;/SPAN&gt; &lt;/P&gt;
&lt;P class=MsoNormal style=&quot;MARGIN: 0cm 0cm 0pt; DIRECTION: ltr; unicode-bidi: embed; TEXT-ALIGN: left; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto&quot;&gt;&lt;SPAN style=&quot;FONT-SIZE: 9pt; COLOR: #0067b3; FONT-FAMILY: Verdana&quot;&gt;Easier Laboratory Modal Testing&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial&quot;&gt;&lt;BR&gt;There is no need for vibration shaker or impact hammer anymore. If you are in your lab doing modal testing in a test rig on some structural component, just do some random tapping on the structure while you are measuring the vibration response in muliple locations. The tapping must be random in time but also spatially. The excitation produced in this way will be a good approximation of a multivariate white noise stochastic process. &lt;/SPAN&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;SPAN style=&quot;FONT-SIZE: 9pt; COLOR: #0067b3; FONT-FAMILY: Verdana; mso-fareast-font-family: &apos;Times New Roman&apos;; mso-bidi-font-family: &apos;Times New Roman&apos;; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA&quot;&gt;Winning Technology in In-situ Modal Testing&lt;/SPAN&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-fareast-font-family: &apos;Times New Roman&apos;; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA&quot;&gt;&lt;BR&gt;Vibration shakers and impact hammers are impossible as excitation sources when it comes to insitu testing of structures, such as buildings or rotating machinery. In cases like this the traditional modalanalyse fails, because there are a number of unknown input acting on the structures. What is a problem for traditional modalanalysis is a strength for Operational Modal Analysis. The more random input sources there are the better the modal results gets. Since the real strength of the technology really lies in the in-situ testing it is no wonder why the technilogy is called Operational Modal Analysis. Another important features that comes for free are that the estimated modes are based on true boundary conditions, and the actual ambient excitation sources.&lt;/SPAN&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;SPAN style=&quot;FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-fareast-font-family: &apos;Times New Roman&apos;; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA&quot;&gt;&lt;FONT face=Tahoma&gt;&lt;FONT color=#0066ff&gt;Refrence:&lt;/FONT&gt;  &lt;/FONT&gt;&lt;FONT face=Arial&gt;&lt;A href=&quot;http://www.svibs.com/&quot;&gt;Structural Vibration Solutions A/S Co.&lt;/A&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;</description>
<pubDate>Sat, 30 Aug 2008 07:52:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=8</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-8.aspx</guid>
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<title>What is operational Modal Analysis</title>
<link>http://modal-analysis.blogfa.com/post-7.aspx</link>
<description>&lt;P dir=ltr align=left&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;You might wonder what Operational Modal Analysis, OMA, is and how it differs from the traditional experimental modal analysis that has been around for the last decades.&lt;/FONT&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;Operational Modal Analysis is also called output-only modal analysis, ambient response analysis, ambient modal analysis, in operation modal analysis, and natural input modal analysis. &lt;/FONT&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;No matter which name that is used the idea is the same: To do modal analisys without knowning and/or controlling the input excitation. &lt;/FONT&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;This new modal technology is capable of estimating the same modal paramters as the traditional known techniques. The modal parameters are the mode shape, the natural frequency and the damping ratio. Some thinks that Operational Modal Analysis just is another name for Operating Deflection Shapes, ODS. This is not the case. Operational Modal Analysis separates noise and input and returns the modal information only. &lt;/FONT&gt;&lt;/P&gt;
&lt;P dir=ltr align=left&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt; &lt;FONT color=#0066ff&gt;Refrence:&lt;/FONT&gt;  &lt;/FONT&gt;&lt;A href=&quot;http://www.svibs.com/&quot;&gt;&lt;FONT face=&quot;arial, helvetica, sans-serif&quot;&gt;Structural Vibration Solutions A/S Co.&lt;/FONT&gt;&lt;/A&gt;&lt;/P&gt;</description>
<pubDate>Sat, 30 Aug 2008 07:50:18 GMT</pubDate>
<comments>http://commenting.blogfa.com/?blogid=modal-analysis&amp;postid=7</comments>
<dc:creator>modal-analysis</dc:creator>
<guid>http://modal-analysis.blogfa.com/post-7.aspx</guid>
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