Synchronization Decoupling Control Study Of Passive Electric-hydraulic Servo System

Passive electro-hydraulic servo system is known as electro-hydraulic loadsimulator. It is used to simulate aerodynamic hinge moment when a designed productis in the air. It is widely used in the load test of major engineering and defense field.Passive electro-hydraulic servo system consists of loading system and bearing system.The force and angular displacement signals is respectively applied to the loading andbearing system. Since the two parts are connect via connecting shaft, so loadingsystem will output two different moments. One is output force that track commandsignal and another is coupling force because bearing system driven loading system.Passive electro-hydraulic servo system has force/position coupling features. Thedegree of force/position has seriously affects the dynamic characteristics of system.With load simulation towards high load, high frequency and high precision, how toeliminate the force/position coupling of loading system and bearing system becomes acritical issue.Based on a large number of domestic and foreign relevant data, this paper summarizes thedevelopment status at the home and aboard. According to the performance requirement, hydrauliccomponents are chosen, the mathematical model of loading system and bearing system and thewhole system are built, and force/position coupling mechanism and influencing factors areanalyzed from theoretical. A new loading device is given that is duplex synchronous motor andits structure is design. According to the seal problem, the seal performance of duplexsynchronous motor is analyzed using finite element software and that can provide theseal and appropriate compression for the processing of motor. The control performanceof system is analyzed using AMESim software, and system using duplex synchronousmotor is built, and the degree of force/position coupling is analyzed. The experimentplatform is built; dynamic characteristics of loading system and bearing system areanalysis. Synchronization control precisions that loading motor and bearing motor isindirectly reflect though coupling moment. The test results provide experimental date for the synchronous tracking accuracy of synchronous motor and bearing motor insynchronous decoupling strategy.