A research on the switching control laws for synchronised switch damping on inductor technique

This paper researches on the control laws of synchronised switch damping on inductor technique (SSDI). The SSDI shunt damping is adaptive to the excitation frequency, and no precise tuning of the shunt parameters is necessary. With this property, the SSDI technique is very adept in handling broadband multimodal and random excitation. The triggering of the switch is decided by a decision algorithm, normally called switching control law, which plays an important role in damping performance. In the original control law, the switch is triggered on each extremum deformation of the shunted piezoelement. It is shown that this switching law maximises the dissipated energy only for monomodal excitation, therefore various control laws were proposed for improving the damping performance in the case of complex multimodal excitation. In this paper, all of the proposed control laws are reviewed and classified. Besides, an enhanced switching law base on modal method is presented and highlighted. Measurements are conduct...