Theoretical Modeling and Experimental Research on Variable-displacement Mechanism with Displacement-force-feedback
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摘要: 位移-力反馈型变量机构是典型的阀控缸位置闭环控制系统。通过分析变量机构的系统构成和工作原理,基于线性化理论建立了控制系统的数学模型,并利用液压测试试验台对数学模型的正确性进行了验证。在此基础上,研究了控制系统的比例特性和影响因素。研究结果表明:先导阀中心复位弹簧是影响控制系统比例特性的重要因素,控制系统比例系数随着弹簧刚度系数的增加而减小,而增大弹簧的预压紧力会加大控制系统的闭死区间。Abstract: The variable displacement mechanism with displacement-force-feedback is a typical closed-loop position control system of valve controlled cylinder.According to the composition and operating principle of this variable displacement mechanism,the mathematical model of the control system is built based on linearization theory,and the exactness of the model is demonstrated by using hydraulic test rig.Besides,the proportional characteristic and influence factors of control system are analyzed.The research results show that the central offset spring of pilot valve has an important impact on the proportional characteristic of the control system,and the proportional coefficient of control system is decreased with the increasing of stiffness coefficient of offset spring,while the closure interval of control system is increased with the increasing of pre-packing force of offset spring.
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