23 Dynamics_02_modal[1]

23 Dynamics_02_modal[1] - Modal Analysis 1-2 D Y N A M I C...

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Unformatted text preview: Modal Analysis 1-2 D Y N A M I C S D Y N A M I C S D Y N A M I C S D Y N A M I C S Modal Analysis A. Define modal analysis and its purpose. B. Discuss associated concepts, terminology, and mode extraction method. C. Learn how to do a modal analysis in ANSYS. 1-3 D Y N A M I C S D Y N A M I C S D Y N A M I C S D Y N A M I C S Modal Analysis A. Definition & Purpose What is modal analysis? • A technique used to determine a structure’s vibration characteristics: – Natural frequencies. – Mode shapes – Mode participation factors (how much a given mode participates in a given direction) • Most functional of all the dynamic analysis types. 1-4 D Y N A M I C S D Y N A M I C S D Y N A M I C S D Y N A M I C S Modal Analysis … Definition & Purpose Benefits of modal analysis • Allows the design to avoid resonant vibration or to vibrate at a specified frequency (speakers, for example). • Gives engineers an idea of how the design will respond to different types of dynamic loads. • Helps in calculating solution controls (time steps, etc.) for other dynamic analyses. Recommendation: Because a structure’s vibration characteristics determine how it responds to any type of dynamic load, always perform a modal analysis first before trying any other dynamic analysis. 1-5 D Y N A M I C S D Y N A M I C S D Y N A M I C S D Y N A M I C S Modal Analysis B. Terminology & Concepts • General equation of motion: • Assume free vibrations and ignore damping:...
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This note was uploaded on 01/20/2010 for the course ME master taught by Professor Mon during the Spring '09 term at Hanyang University.

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23 Dynamics_02_modal[1] - Modal Analysis 1-2 D Y N A M I C...

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