Chaotic operation and chaos control of travelling wave ultrasonic motor

被引:24
作者
Shi Jingzhuo [1 ]
Zhao Fujie [1 ]
Shen Xiaoxi [1 ]
Wang Xiaojie [1 ]
机构
[1] Henan Univ Sci & Technol, Luoyang 471003, Peoples R China
关键词
Travelling wave ultrasonic motor; Chaos; Phase-space reconstruction; Lyapunov index; Speed control; ANTI-CONTROL;
D O I
10.1016/j.ultras.2013.02.006
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
The travelling wave ultrasonic motor, which is a nonlinear dynamic system, has complex chaotic phenomenon with some certain choices of system parameters and external inputs, and its chaotic characteristics have not been studied until now. In this paper, the preliminary study of the chaos phenomenon in ultrasonic motor driving system has been done. The experiment of speed closed-loop control is designed to obtain several groups of time sampling data sequence of the amplitude of driving voltage, and phase-space reconstruction is used to analyze the chaos characteristics of these time sequences. The largest Lyapunov index is calculated and the result is positive, which shows that the travelling wave ultrasonic motor has chaotic characteristics in a certain working condition Then, the nonlinear characteristics of travelling wave ultrasonic motor are analyzed which includes Lyapunov exponent map, the bifurcation diagram and the locus of voltage relative to speed based on the nonlinear chaos model of a travelling wave ultrasonic motor. After that, two kinds of adaptive delay feedback controllers are designed in this paper to control and suppress chaos in USM speed control system. Simulation results show that the method can control unstable periodic orbits, suppress chaos in USM control system. Proportion-delayed feedback controller was designed following and arithmetic of fuzzy logic was used to adaptively adjust the delay time online. Simulation results show that this method could fast and effectively change the chaos movement into periodic or fixed-point movement and make the system enter into stable state from chaos state. Finally the chaos behavior was controlled. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:1112 / 1123
页数:12
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