Frictional And Experimental Reserch On Electrohydraulic Servomotor To Simulator

Flying posture Three-axis simulator is a set of equipment with important significance of national defense and economic value, its performance indexes directly relate to the fidelity of simulation results. With the present increasingly austere international situation and the development of modern military techniques in China, the demands for technical level, applying range and request for simulator become higher and higher. Hollow swing and continuous rotary electrohydaulic servomotor with different advantages dividually are widely used in simulations. Compared with them,hollow swing can outputs large torque and continuous rotary can rotate around one shaft continuously. Based on this background, these two kind of motor are studied as object. Aimed at solving their technological problem, the paper does some research on these two kinds of motor.After synthesizing a lot of related literatures and reference materials at home and abroad, the paper summarizes the research on continous rotary and hollow swing electrohydraulic servomotor to simulator. Based on analyzing all the factors that take effect on electrohydraulic servomotor, the paper compares their typical technology.Aimed at improving low-speed performance of servomotor, the paper takes hollow electrohydraulic servo motor as example and anysis friction property of ervo motor by friction-and-wear trial and finite element softwareADINA.The main contents are listed as below. The paper does friction and wear experiment to determine which kind of material is the best and the best percentage. In addition, By finite analysis software ADINA, seal characteristics and friction torque are aquired. Based on those conclusion, the paper adopts ADINA-FSI to aquire the internal characteristics, including deformed structure, the influence of friction torque at low speed and seal. can be exactly computed. In the meantime, the paper takes continuous electrhydraulic servomotor as example. The paper found maths model of electrohydraulic position servo system. Aimed at real system,it compute all the parameters. Based on this,the paper introduces PID control strategy, differential forward feedback control strategy, frictional compensation control strategy and compound control strategy commonly used in simulators. Aimed at the actual system, the simulation of the sine,slope and step signal response under these two control strategies are used. It can be proved that these control strategies can effectively improve the dynamic and static properties of system.The hardware interface circuit of electrohydraulic position servo system and experimental skeme sre developed. Restricted by equipment in our lab, the paper only does some experiment on continuous rotary electrohydraulic servo postion system. The paper does some experiments based on the changed-parameter PID control strategy, differential forward feedback control and friction torque compensation control strategy. Between all these contol strategy, the paper places emphasis on the friction torque compensation control. The experimental results also confirm the theoretic analysis and some significant conclusions are acquired.