Research And Design, Electro-hydraulic Servo Loading System

Electro-hydraulic servo loading system (EHSLS) is an important simulation system in hardware-in-loop flight simulation laboratory, which can simulate aerodynamic loads acting on flight vehicle, such as missiles, planes. It is one of most important devices in the whole flight vehicle simulation system. Aiming at the demand of how to decrease disturbance torque and how to extend loading system's frequency band, this thesis analyses the EHSLS and finds some factors which can influence the system's performance.In this thesis, EHSLS's mathematical model is established. Then, digital simulation and analysis about system is carried out. Last, a prototype equipment is designed to prove conclusion which is achieved from model analysis in theory. The contributions are as follows:(1) Establish the system's mathematical model and get relatively uniform structure of model.(2) According to digital simulation about system, the reason to produce disturbance torque is described. Then, PID control strategy is proposed and invariance theory is introduced to decrease the disturbance torque which is caused by motion of loaded object.(3) Based on system model, influence of connection stiffness which links the loading system and steering system is analyzed, and influence of loading grads is discussed.(4) The electric control system and computer control system about prototype equipment is designed. Then, precision of the equipment is roughly estimated.(5) By means of project of electric control system, the design and manufacture of all circuit is accomplished.