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基于国防和航天对轨/姿控火箭发动机脉冲推力矢量动态测试的重大需求,以压电石英为力敏,研制了压电式推力矢量动态测试系统。在探讨推力矢量描述参数及计算的基础上,提出了一种推力矢量测量方案。根据静力平衡原理,推导了求解推力矢量的一般方程。改进了非线性模态分析方法,以所获取的实际动态响应曲线为基础,建立了测试系统的理论动力学模型,利用拉普拉斯变换与逆变换、卷积定理,研究了系统的动态性能和脉冲推力测量性能。针对脉冲推力测量过程中所产生的误差,提出了一种基于理论动力学模型的加速度补偿算法。实验结果证明了测量方案和加速度补偿算法的可行性。
Based on the great demand of the dynamic test of pulse thrust vector of the orbit / attitude control rocket engine, the dynamic test system of piezoelectric thrust vector was developed based on piezoelectric quartz. Based on the description of thrust vector parameters and calculation, a thrust vector measurement scheme is proposed. According to the principle of static balance, the general equation for solving thrust vector is deduced. The nonlinear modal analysis method is improved. Based on the obtained actual dynamic response curve, the theoretical dynamic model of the test system is established. The Laplace transform, inverse transform and convolution theorem are used to study the dynamic performance of the system And pulse thrust measurement performance. Aimed at the errors caused by pulse thrust measurement, an acceleration compensation algorithm based on theoretical dynamics model is proposed. The experimental results demonstrate the feasibility of the measurement scheme and the acceleration compensation algorithm.