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Modal Vibration Testing & Frequency Analysis

Experimental modal analysis is a vibration testing technique for determining the natural frequencies, mode shapes and damping ratios of a structure.

During modal testing, an instrumented hammer, electromagnetic shaker, or piezoelectric actuator is used to excite vibration of the test article.

 

The vibration amplitude and phase (response) to the excitation is measured at multiple locations and frequency response functions are calculated.

Curve fitting techniques are used to extract the natural frequencies, mode shapes and damping ratios of a structure. These modal parameters may be used for finite element analysis (FEA) model validation (correlation) and refinement, failure investigation, vibration troubleshooting and diagnostics, and quality assurance.

Due to the versatility of modal testing it can go by several names such as resonance test, natural frequency measurement, frequency response test (FRF), modal survey, or modal vibration test to name a few.

 

 

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Experimental Modal Analysis
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