Hybrid vibration suppression of multiple vibration modes of flexible structures using piezoelectric elements and analog circuit

摘要

There are two main methods to suppress vibration of flexible structures using piezoelectric elements.One is active vibration control and the other is passive vibration suppression.Generally,the former is effective but has stability problems.The latter avoids such instability; however,most of them can suppress only a single vibration mode although flexible structures have multiple vibration modes even in low frequency domain and its controlling force is small.It is true that there are some passive methods to suppress multiple vibration modes using multiple degrees of freedom circuit,however,they have problems in the performance and it is complicated to tune the circuit.Hence,this paper proposes a new hybrid method which solves those problems using analog circuit.The performance of each vibration mode can be tuned independently in this method.Its performance and effectiveness are verified by the experiment and those results are compared with theoretical analysis.