Question

How magnification factor related to frequency factor?

Answer 1

. At the same excitation, power output was 0.33 µW when connected to a 470 kΩ impedance-matched resistive load. Figure 6 shows the relationship between open-circuit voltage and displacement magnification factors and frequency. Figure 7 shows the RMS voltage and displacement vs. frequency. All measurements were made at constant input excitation. It is hypothesized that the discrepancies between voltage and displacement magnification factors in Figure 6 at higher frequencies are due to the changing resonant positions of the proof mass along the beam at different frequencies. The different stable positions of the proof mass affect the shape of the first vibration mode and thus the beam deflection shapes and bending moments at the clamp points. Thus, it is thought that the stresses on the piezoelectric material (and output) are altered, while center beam displacement is less affected. Experimental verification of this hypothesis is necessary. At this stage, it is not fully understood why the voltage and displacement experience a drop at 164 Hz (Figure 7) and it will be cause for further investigation. Characterization of the effects of system parameters on voltage output and beam displacement revealed inconsistencies and instabilities of the system. The system is very sensitive to the characteristics