Modal Analysis Testing

Response Dynamics has performed modal analysis on a wide array of devices, and products ranging in size from a slice of a wafer to balcony of performing arts structure. Modal analysis is used to determine resonant frequencies and mode shapes of the tested structure or specimen. It is also performed to confirm finite element analysis findings. Modal analysis and finite element modeling are usually performed in conjunction.

Modal testing involves the measurement and analysis of input forces and corresponding response vibrations when a structural system is dynamically excited with either an electromagnetic shaker or a hammer. A low-level dynamic force (usually less than 50 lbs) is applied at one location (driving point) on the structure. The location of the driving point and the measurement points are carefully chosen to identify all modes of vibration of the structure in the desired frequency range. The transfer functions between the driving force and dynamic responses are computed during the measurements.  The measured data are saved to the hard disk for subsequent analysis.