Affiliation:
1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2. Jiangsu Jingjiang Instrument Transformer Co., Ltd., 206 Xingang Avenue, Jingjiang 214500, China
Abstract
To improve the machining quality of the non-resonant elliptical vibration cutting (EVC) device, a compound control method for trajectory error compensation is proposed in this paper. Firstly, by analyzing the working principle of non-resonant EVC device and considering the elliptical trajectory error caused by piezoelectric hysteresis, a dynamic PI (Prandtl-Ishlinskii) model relating to voltage change rate and acceleration was established to describe the piezoelectric hysteresis characteristics of EVC devices. Then, the parameters of the dynamic PI model were identified by using the particle swarm optimization (PSO) algorithm. Secondly, based on the dynamic PI model, a compound control method has been proposed in which the inverse dynamic PI model is used as the feedforward controller for the dynamic hysteresis compensation, while PID (proportion integration differentiation) feedback is used to improve the control accuracy. Finally, trajectory-tracking experiments have been conducted to verify the feasibility of the proposed compound control method.
Funder
National Natural Science Foundation of China
Postdoctoral Science Foundation of China
High Level Personnel Project of Jiangsu Province
Central University Basic Research Fund of China
Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology
Nanjing Foundation for Returnees
Foundation of Jiangsu Science and Technology Association Young Talents
Subject
Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering