The Modal Survey Test Facility is used to measure dynamic response characteristics of aerospace structures. The facility consists of a seismic block with a t-slot table interface on which test items are mounted to simulate a fixed boundary condition. It is also possible to suspend test items over the facility for freely supported test configurations. Methods of excitation include shaker, hammer, and step relaxation. Shaker excitation types include random, burst random, sine, and stepped sine. The modal data acquisition system computes frequency response functions (FRF's) real time for up to 96 input channels. For tests requiring larger channel counts a breakout/switching rack allows for up to 384 channels to be acquired in 96 channel datasets.
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