微推进器作为微小卫星在轨运行的核心部件，对其推力大小的精确测量显得尤为重要。为了克服传统机构存在诸如平衡不稳定、响应慢、需要克服摩擦力等不足，一种基于枢轴承的钟摆型推力测试系统被提出用于微推力测试。首先，建立了该测试系统的动力学模型，并对其阶跃响应进行仿真分析，结果显示响应曲线出现超调、震荡等不稳定的现象。为改善测试系统的动态特性，采用双线性法设计了一动态补偿滤波器，并建立了包含补偿的测试系统的动力学模型，对其动态响应进行数值仿真分析，结构显示固有频率由2.2提高到3.32Hz,阻尼系数由0.02提高到0.707，有效改善了测试系统的动态特性。%The micro-thruster, as a key component in microsatellite, is very important in precise measurement of thrust. To over-come shortcomings,such as unstable equilibrium, slow response and large friction in traditional thrust test facility, a pendulum type structure is chosen in the design of micro-thruster test system. The dynamic model of the test system is built and simu-lated, which shows that the response curve has oscillation and instability. A dynamic compensation filter is designed based on the bilinear method. The response of the test system with compensation is simulated. The results show that the natural frequen-cy increases from 2.2 to 3.32Hz and damping ratio increases from 0.02 to 0.707.
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