结果表明，采用非线性控制规律，负载模拟系统的跟踪特性好，且系统能有效抑制强扰动所引起的多余力矩。
The result shows that load simulation system has a nice tracking characteristic by means of nonlinear control law, and the redundant moment brought by strong disturbance can be effectively restrained.
提出了一种采用旋转式换向阀及弹簧蓄能器模拟发动机负载的液压负载模拟系统，详细介绍了该系统的工作原理；
A new hydraulic load simulation system, adopting a rotation directional valve and using a spring accumulator simulating the starter load, is proposed and working principles are described.
设计了液压负载模拟系统中的关键元件旋转式换向阀，建立了其数学模型和仿真模型，并仿真分析其关键参数对液压负载模拟系统的影响规律。
The rotation directional valve, key component of the system, is developed. Influence principles of structural parameters are analyzed based on the mathematical and simulation model.
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