5 Characterization of a Small Electro-Mechanical Contact Using LDV Measurement Techniques 49 Fig. 5.3 Frequency contact of electrical contact in air [1] Fig. 5.4 Frequency contact of electrical contact in 10cs oil [1] Fig. 5.5 Frequency contact of electrical contact in 20cs oil [1] (FFT) data for each of the setups— one in air, one in 10cs oil, and the last in 20cs oil, as seen in Figs. 5.3, 5.4, and 5.5, respectively. These FFTs aren’t quite right, as an input force measurement is required to get a proper transfer function. This is due to a challenge with the actuation method used. The displacement of the actuator is 14 μm±10%. Without a more complex test fixture, it is nearly impossible to get the actuator positioned to the part within that displacement value. The actuation provided is technically the fluid, including the air, being displaced by the actuator. This fluid movement is what excited the part enough for measurements to be taken by the LDV. Figures 5.6 and 5.7 display the measurement results from the LDV of the first and second bending modes in air. All figures are referenced from Johnson’s results [1].
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