| Electro-hydraulic control system which is considered as an exact and effective control mode is extensively used in modern industry. The integration of electro-hydraulic control system's control level (electric, electron) and power level made it having the two advantages of electric and hydraulic pressure, then having a strong function and potential and forming a competitive technical characteristic. The development of modern electro-hydraulic control technology matters closely with the progress of control strategy. For electro-hydraulic control system is usually complicated and nonlinear system, in order to get high-precision, high-response, high-reliability and better robustness, there must be corresponding control strategy.This paper applies linear quadratic optimal control theory in modern control theory to electro-hydraulic system. The paper have established state space mathematic model based on the hydraulic drive 6-DOF parallel robot stewart platform'single channel electro-hydraulic control system, designed LQR optimal controller by MATLAB control system toolbox, and according to simulation study, discussed the impact of the weigh matrix's choice and variation on system's dynamic performance. And based on stewart test platform, the paper have applied LQR controller and PID controller to stewart platform'single channel valve-controlled cylinder system, and made tests on the dynamic performance response and trajectory tracking. The paper have validated LQR controller's applicability by comparing control performance of the two controllers. It's concluded that LQR optimal controller have better dynamic performance comparing PID controller.
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