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根据液压伺服作动器的工作原理,运用牛顿运动力学和流体运动力学建立其线性化的数学模型。在MATLAB/Simulink环境下,对液压伺服作动器的线性和非线性数学模型进行了仿真分析,研究其考虑非线性环节时液压伺服作动器的阶跃响应、闭环频率特性和开环频率特性,并与其线性数学模型的性能进行比较分析。分析结果表明,死区影响液压伺服作动器的时域动态性能和闭环频率特性,不影响其稳定性。死区使液压伺服作动器的阶跃响应曲线光滑而无振动,但是会延长其调整时间。
According to the working principle of hydraulic servo actuator, the mathematical model of linearization is established by using Newtonian kinematics and fluid dynamics. In the MATLAB / Simulink environment, the linear and nonlinear mathematical models of the hydraulic servo actuator are simulated and analyzed, and the step response, the closed-loop frequency characteristic and the open-loop frequency characteristic of the hydraulic servo actuator are considered when considering the nonlinearity , And compared with the performance of its linear mathematical model. The analysis results show that the dead zone affects the dynamic performance of the hydraulic servo actuator in the time domain and the closed-loop frequency without affecting its stability. The dead band smoothes the step response curve of the hydraulic servo actuator without vibration but prolongs its adjustment time.