文档介绍：附二: 外文翻译
High Precise Control Method for a New Type of
Piezoelectric Electro—hydraulic Servo Valve
Abstract:A new type of piezoelectric electro-hydraulic servo valve system was proposed. And then multilayer piezoelectric actuator based on new piezoelectric ceramic material was used as the electricity-machine converter of the proposed piezoelectric electro-hydraulic servo valve. The proposed piezoelectric electro -hydraulic servo valve has ascendant pared with conventional the system is of high nonlinearity and uncertainty, it cannot achieve favorable control performance by conventional control develop an efficient way to control piezoelectric electro—hydraulic servo valve high—precise fuzzy control method with hysteresis nonlinear model in feedforward loop was proposed. The control method is separated into two parts:a feedforward loop with Preisach hysteresis nonlinear model and a feedback loop with high-precise fuzzy contro1. Experimental results show that the hysteresis loop and the maximum output hysteresis by the PID control method are % and pm, respectively;the hysteresis loop and the maximum output hysteresis by the proposed control method respectively are % and ,respectively;the maximum tracking error by the PID control method for sine wave reference signal is about % , the maximum tracking error by the proposed control method for sine wave reference sign al is about %.contro1.
Key words:piezoelectric electro—hydraulic servo valve;hysteresis nonlinearity;Preisach model;fuzzy control
1 Introduction
Electro—hydraulic servo system is widely applied in industrial domain drive,machine building, architectural engineering.
The electro-hydraulic servo valve is the kernel of the electro-hydraulic servo system,and its performance has decisive effect Of the whole conventional
drive mode of servo valve has lower resolution and narrower work band width,w