For the crableg electrostatic drive shown in the figure below, do the following assuming E = 155 GPa, rho = 2300 kg/m^3.
Obtain the displacement of the shuttle mass as a function of time (using emdyn files) when DC and AC voltages are applied. Put in damping in a simplified manner on the shuttle mass using Cuette flow model. Use parallel-plate approximation for the electrostatic force on the comb-fingers.
Choose reasonable values of the voltages and frequency of the AC voltage to run a simulation. But the program is general and will run for any values.
As shown in the figure below, a DC voltage is applied between two cantilever beams. Find the pull-in voltage using emstatic code as well as lumped-model, and compare the two. Extra credit of upto 5 "midterm" points if you obtain pull-in time in the absence of damping both with the emdyn code and analytical lumped model. Assume the following values. L1 = 200 um, L2 = 100 um; g = 4 um; Both beams are of uniform cross-section of rectangular shape, 10 um X 2 um. 2 um is the thickness as viewed perpendicular to the screen. Assume E = 155 GPa and rho = 2300 kg/m^3.
