Nonlinear dynamic analysis of traveling wave-type ultrasonic motors

被引:29
作者
Nakagawa, Yosuke [1 ]
Saito, Akira [1 ]
Maeno, Takashi [1 ]
机构
[1] Keio Univ, Dept Mech Engn, Yokohama, Kanagawa 223, Japan
关键词
D O I
10.1109/TUFFC.2008.696
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
In this paper, nonlinear dynamic response of a traveling wave-type ultrasonic motor was investigated. In particular, understanding the transient dynamics of a bar-type ultrasonic motor, such as starting up and stopping, is of primary interest. First, the transient response of the bar-type ultrasonic motor at starting up and stopping was measured using a laser Doppler velocimeter, and its driving characteristics are discussed in detail. The motor is shown to possess amplitude-dependent nonlinearity that greatly influences the transient dynamics of the motor. Second, a dynamical model of the motor was constructed as a second-order nonlinear oscillator, which represents the dynamics of the piezoelectric ceramic, stator, and rotor. The model features nonlinearities caused by the frictional interface between the stator and the rotor, and cubic nonlinearity in the dynamics of the stator. Coulomb's friction model was employed for the interface model, and a stick-slip phenomenon is considered. Lastly, it was shown that the model is capable of representing the transient dynamics of the motor accurately. The critical parameters in the model were identified from measured results, and numerical simulations were conducted using the model with the identified parameters. Good agreement between the results of measurements and numerical simulations is observed.
引用
收藏
页码:717 / 725
页数:9
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