Two additional analyses are performed for this problem:
A static analysis with one terminal grounded and a bolt preload of 50 N is performed. A prestressed modal analysis using the linear perturbation method and the Block Lanczos eigensolver is then executed, where the first 40 modes are requested.
The linear perturbation method for modal analyses is described in Applying Prestress Effects in a Modal Analysis in the Structural Analysis Guide.
A static analysis as described above is run first. A prestressed harmonic response analysis using the full method is used to calculate the frequency response between 57 and 60 kHz with 30 substeps. In this coupled field harmonic response analysis, the linear perturbation method is used to include prestress effects. The applied voltage is 5V.
The linear perturbation method for full harmonic response analyses is described in Prestressed Harmonic Analysis in the Structural Analysis Guide.