低压透平电液调节系统的建模及仿真研究

Research on Modeling and Simulation of Low Pressure Turbine Electro-hydraulic Regulating System

以某种低压透平电液调节系统为例,分析其多级放大结构的耦合特点,以及应用伺服随动反馈控制先导级滑阀阀口和主滑阀阀口开度变化的机制,建立该系统的数学模型,并采用MATLAB/Simulink对其进行仿真。搭建低压透平电液调节系统试验台,试验结果表明:利用该模型获得的试验结果与仿真结果吻合性较好,验证了该数学模型的正确性和可行性;适当减小主阀芯弹簧刚度以及油缸有效面积,可在不影响稳态输出精度条件下,明显提升低压大流量系统的动态响应速度;减小先导阀弹簧刚度,可在响应速度不变的条件下,减小对控制油压的响应时间,使静态输出特性曲线零位死区减小;给出了能提高系统动态响应速度的优化参数取值。研究成果可为低压大流量伺服控制系统的设计及优化提供参考。

Taking a certain low-pressure turbine electro-hydraulic regulating system as an example,the coupling characteristics of its multi-stage amplification structure and the opening mechanism of the pilot valve port and the main valve port controlled by servo follow-up feedback were analyzed.The mathematical model of the system was established and simulated by using MATLAB/Simulink.The test platform for low pressure turbine electro-hydraulic regulating system was built.The test results shows that the test results obtained by using the model are in good agreement with the simulation results,by which the correctness and feasibility of the mathematical model are verified.Appropriately reducing the spring stiffness of the main valve core and the effective area of the oil cylinder can significantly improve the dynamic response speed of the low-pressure and large flow system without affecting the steady-state output accuracy;by reducing the spring stiffness of the pilot valve,under the condition of constant response speed,the response time to the control oil pressure and the zero dead zone of the static output characteristic curve can be reduced;the optimal parameters which can improve the dynamic response speed of the system are proposed.The research results can provide reference for the design and optimization of the low pressure and large flow servo control system.