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针对大型运载火箭伺服机构所受实际负载情况,提出了一种综合负载模拟系统,能够模拟惯性、弹性、摩擦和常值负载。其中惯性负载、弹性负载以及伺服机构的柔性安装基础采用机械结构模拟,摩擦负载和常值负载采用液压系统来实现。分别对伺服机构、液压加载系统以及柔性结构进行建模,并以此为基础构造了系统的综合数学模型。仿真表明,该系统能够复现伺服机构实际工况下的负载特性,加载多余力也能得到很好的抑制。建立了负载模拟试验系统,实现了对各种负载及谐振特性的模拟,为伺服机构的地面测试和深入研究提供必要的实验基础。
According to the actual load situation of large launch vehicle servo system, a comprehensive load simulation system is proposed to simulate inertial, elastic, friction and constant load. Among them, inertia load, elastic load and flexible installation of servo mechanism are based on mechanical structure simulation. Friction load and constant load are realized by hydraulic system. The servo mechanism, hydraulic loading system and flexible structure are modeled separately, and based on which, a comprehensive mathematical model of the system is constructed. The simulation shows that the system can reproduce the load characteristics of the servo under the actual conditions, and the extra load can be well suppressed. The load simulation test system is established to simulate various load and resonance characteristics and provide necessary experimental basis for ground test and in-depth study of servo mechanism.