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为模拟运载火箭推力矢量伺服机构的工作状态,提出一种包含安装柔性和负载柔性的电液式综合负载模拟系统,能够同时模拟惯性、弹性、摩擦和常值四种负载。根据系统结构组成,建立系统的数学模型,并提出了一种简化系统闭环传递函数的方法,从而得到系统谐振峰频率的理论计算公式。搭建仿真模型,对该系统进行仿真,仿真结果表明可以通过改变质量块2来调整第二谐振峰的频率和幅值,验证了理论计算结果的正确性,同时对各种情况下系统中的谐振峰形态进行了论述,为地面测试系统中谐振峰的调整提供了一定的理论依据和方法指导。
In order to simulate the operation state of thrust vector servo of launch vehicle, an electro-hydraulic integrated load simulation system including installation flexibility and load flexibility is proposed, which can simultaneously simulate four loads of inertia, elasticity, friction and constant. According to the structure of the system, a mathematical model of the system is established, and a method of simplifying the closed-loop transfer function of the system is proposed. The theoretical formula of the resonant frequency of the system is obtained. The simulation model is built to simulate the system. The simulation results show that the frequency and amplitude of the second resonance peak can be adjusted by changing the mass 2, which verifies the correctness of the theoretical calculation results. At the same time, The morphology of the peak is discussed, which provides some theoretical basis and method guidance for adjusting the resonance peak in the ground test system.