Reducing chatter in turning using a piezoelectric LR passive shunt strategy
Giuliana Sardi Venter1; Lucas Missura do Paraizo Silva1; Maira Martins da Silva1
1 Sao Carlos School of Engineering - USP
doi:10.20906/CPS/COB-2015-0439
Resumo
The self excited vibration called chatter is a recurring problem during machining. The use of slender boring bars with the purpose of internal turning is an aggravating to the vibration that can lead to poor surface quality and excessive tool wear. In this paper, a passive control strategy is evaluated in experiments. The results are presented using frequency response functions (FRFs), in which the amplitude of vibration for the two main directions of cutting is evaluated. The FRFs are obtained using impact tests. The results are generated for four different scenarios. Firstly, the system is evaluated with no control strategy being applied. Then, the system's response to the use of piezoelectric LR passive shunts in the two main directions of vibration is analysed. The third and fourth scenarios are the ones in which the shunt is connected only to one direction. The paper presents results in which close to 20% reduction in the vibration amplitude can be seen. Numerical simulations are performed using a finite element method approach. The electromechanical coupled structure presents FRFs that are very close the experiments.
Palavras-chave: Smart materials; Piezoelectric materials; Chatter; Passive shunts; Vibration control