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Fundamentals of Structural Dynamics Unrestricted © Siemens AG 2013 All rights reserved. Smarter decisions, better products. Structural Dynamics Agenda Topics How to characterize structural How does my structure How to validate simulation behavior? naturally want to move? models? Fundamentals Modal Analysis Modal Correlation Natural Frequencies, Resonances, Curve fitting, data quality checks Modal Assurance Criteria, Modal Damping (MAC), mode shapes Contribution, Updating ssssttttrrrruuuuccccttttuuuurrrreeee----bbbboooorrrrnnnneeee aaaaiiiirrrr----bbbboooorrrrnnnneeee ssssttttrrrruuuuccccttttuuuurrrreeee----bbbboooorrrrnnnneeee Unrestricted © Siemens AG 2013 All rights reserved. Page 2 11-11-2013 Siemens PLM Software Why are structural dynamics important? Unrestricted © Siemens AG 2013 All rights reserved. Smarter decisions, better products. Product Development Process Troubleshoot Validate e g n a h C f Engineer o t s o C Concept Detail Prototype Production Field Drawing Failure Unrestricted © Siemens AG 2013 All rights reserved. Page 4 11-11-2013 Siemens PLM Software Why identify structural resonance? Durability Performance/Perceived Quality Safety P a i n s Field failure Noise & Vibration problem Product Certification Increasing speed causes: - Steerling wheel shake - Structural integrity - Component breakdown - Driver seat vibration - Ground Vibration Testing - Machine failure - Noise at Driver’s & - Reduce vibration dose value - Poor precision Passenger’s Ears - Flutter phenomena - Inconsistent product quality … … W … h a t ? Excessive vibration problems Unrestricted © Siemens AG 2013 All rights reserved. Page 5 11-11-2013 Siemens PLM Software Aircraft Flutter Unrestricted © Siemens AG 2013 All rights reserved. Page 6 11-11-2013 Siemens PLM Software Tacoma Bridge Collapse Unrestricted © Siemens AG 2013 All rights reserved. Page 7 11-11-2013 Siemens PLM Software Natural frequency of a traffic signal Unrestricted © Siemens AG 2013 All rights reserved. Page 8 11-11-2013 Siemens PLM Software What is a natural frequency? Unrestricted © Siemens AG 2013 All rights reserved. Smarter decisions, better products. Natural Frequency Natural frequency is the frequency at which a system naturally vibrates once it has been forced into motion f(t) x(t) m k c ground Single Degree of Freedom System k    natural frequency (rad/sec) n m Unrestricted © Siemens AG 2013 All rights reserved. Page 10 11-11-2013 Siemens PLM Software

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Fundamentals of Structural Dynamics Structural Dynamics Agenda Topics. Modal Analysis Why are structural dynamics important? Page 112

Experimental Modal Acquisition and Analysis PDF

166 Pages·2014·3.99 MB·English

by Scott Beebe

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Fundamentals of Structural Dynamics Structural Dynamics Agenda Topics. Modal Analysis Why are structural dynamics important? Page 112

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Author:	Scott Beebe
Publication Year:	2014
Pages:	166
Language:	English
File Size:	3.99
Format:	PDF
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