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©2013 The Japan Society of Mechanical Engineers For the piezoelectric shunt damping technique, active shunt circuits play an essential role for realizing advanced sensor-less piezoelectric vibration control systems. This paper discusses the stability margin of the piezoelectric shunt damping system using the virtual admittance also known as the synthetic admittance. A grounded current amplifier with the drift compensator is developed and its detailed circuit is shown. A physical interpretation of the drift compensator and some remarks are also discussed. From the analysis of the stability-margin of the open-loop transfer function, it is shown that the virtual admittance is suitable for simulating the inductive shunt such as a series LR circuit. The experimental result demonstrates the damping performance of the series LR elements realized by the developed virtual admittance circuit attached to a piezoelectric cantilever.

Development of a Grounded Virtual Admittance Circuit and Piezoelectric Shunt Damping with a Virtual Series LR Elements