Abstract
Piezoelectric shunt damping is a unique technique, which utilizes a piezoelectric element as both an actuator and a sensor. In this paper, we develop a virtual impedance circuit with a DSP. The low pass filters are necessary for anti-aliasing, however the system becomes unstable due to the filters. Therefore we conduct stability analysis with the open-loop transfer function and propose a simple method for stabilizing the system. Experimental results show the effectiveness of the proposed method for the shunt damping with the digital virtual impedance.
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