Working with the LDV system

The sequence of steps followed while workings with the PSV system are shown in Figure 36.4.

Figure 36.4 Workflow during the experiment on LDV

Details of the test setup

Composite plates are coated with white spray for the purpose of better reflection. Plates are experimented in cantilever position as shown in the Figure 36.5 (a).

Figure 36.5 (a) Composite test plate with dynamic shaker

For the dynamic excitation of the composite plate an electro-dynamic shaker is used. A power amplifier (make: LDS, PA500L series) is connected to the shaker for the purpose of amplifying the excitation signal generated by the LDV system. During the experiment, a pseudo random signal in the frequency range of 0-2000 Hz is used for the excitation of the composite plate. Experiment is carried out in two steps. In the first step the plate is excited from 0-800 Hz with a signal voltage of 0.2 V. In the second step the plate is excited from 800-2000 Hz with increased amplifier gain in order to excite the high frequency modes.