Transcription of Support Conditions for Experimental Modal Analysis
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Support Conditions for Experimental Modal Analysis
SOUND AND VIBRATION/JUNE 2007 When Modal testing a structure for model validation, free boundary Conditions are frequently approximated in the lab to compare with free boundary-condition analyses. Free Conditions are used because they are normally easy to simulate analytically and easier to approximate experimentally than boundary condi-tions with fixed Conditions . However, the free Conditions can only be approximated in the lab, because the structure must be supported in some manner. This article investigates and quanti-fies the effects of the Support Conditions on both the measured Modal frequencies and damping factors. The investigation has determined that the measured Modal damping is significantly more sensitive to the Support system (stiffness and damping) than the measured Modal frequency.
10 SOUND AND VIBRATION/JUNE 2007 www.SandV.com When modal testing a structure for model validation, free boundary conditions are frequently approximated in the lab to compare with free boundary-condition analyses.
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