外文翻译--新型直动式压电电液伺服阀复合控制方法
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1、 中文 3450 字 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 th
2、e electricity-machine converter of the proposed piezoelectric electro-hydraulic servo valve. The proposed piezoelectric electro -hydraulic servo valve has ascendant performance compared with conventional ones.But the system is of high nonlinearity and uncertainty, it cannot achieve favorable control
3、 performance by conventional control method To develop an efficient way to control piezoelectric electro hydraulic servo valve system A high precise fuzzy control method with hysteresis nonlinear model in feedforward loop was proposed. The control method is separated into two parts: a feedforward lo
4、op 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 4.22 and 2 11 pm, respectively; the hysteresis loop and the maximum output hysteresis by
5、 the proposed control method respectively are 0 74 and 0 37m, respectively; the maximum tracking error by the PID control method for sine wave reference signal is about 5 02 , the maximum tracking error by the proposed control method for sine wave reference sign al is about 0 85 contro1 Key words: p
6、iezoelectric electro hydraulic servo valve; hysteresis nonlinearity; Preisach model; fuzzy control 1 Introduction Electro hydraulic servo system is widely applied in industrial domain nowadays for example robot drive, machine building, architectural engineering The electro-hydraulic servo valve is t
7、he kernel of the electro-hydraulic servo system,and its performance has decisive effect Of the whole system The conventional drive mode of electro hydraulic servo valve has lower resolution and narrower work band width, which restricts the applications of the electro-hydraulic servo valve The propos
8、ed piezoelectric electro-hydraulic servo valve adopts multilayer piezoelectric actuator as electricity-machine converter. This Hew type of piezoelectric electro-hydraulic servo valve has better dynamic performance than that of conventional ones At present, with the research and the development of ne
9、w-type actuator based on new type materials, it is possible to make the new electricity-machine converter with high frequency. New materials include piezoelectric ceramic materials, magnetostrjctive materials, shape memory alloys Thereinto, multilayer piezoelectric actuators based on new piezoelectr
10、ic ceramic materials have many merits such as small cubage, high resolution, high frequency and large drive force Hence, they are widely used in the micro-position device of machine tools and other precision machines 1-6 However, they also have many shortcomings, for example, hysteresis nonlinearity
11、 model in feedforward loop was proposed 2 Work principle and characteristic of new-type of piezoelectric 第 页 1 electro-hydraulic Valve Because the pulling force capacity of multilayer piezoelectric actuator is very poor, it cannot make the slide valve of the electro, hydraulic servo valve bidirectio
12、nallv move. Two multilayer piezoelectric actuators were adopted to solve this problem 7-8. The shortcoming of this method is high cost and system is difficult to contro1. Utilizing the restoring force of a leaf spring, one multilayer piezoelectric actuator can realize bidirectional movement of the s
13、lide valve in this paper. W hen the voltage imposed on multilayer piezoelectric actuator 1s increased, multilayer piezoelectric actuator will elongate and drive the slide valve to move towards the left, which makes the leaf spring deform On the contrary, when the voltage imposed on multilayer piezoe
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