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微冲量测量是脉冲微推力器推进性能研究的关键问题之一。利用摆等动力学结构,将冲量测量转化为摆角(位移)测量是微冲量测量的主要研究方法。基于二阶系统模型,在摆无阻尼振动及冲量瞬间耦合的条件下,定量研究了冲量测量的建模误差。研究结果表明,不管作用力的脉冲波形如何,只要作用力时间与摆的振动周期之比足够小且阻尼比足够小,建模误差完全可以忽略。
Micro-impulse measurement is one of the key issues in the research of impulsive micro-thrusters. The use of pendulum kinetic structure, the impulse measurement into swing (displacement) measurement is the main research method of micro-impulse measurement. Based on the second-order system model, the modeling error of impulse measurement was quantitatively studied under the conditions of undamped vibration and instantaneous coupling of impulse. The results show that the modeling error is negligible, no matter what the impulse waveform of the force, as long as the ratio of the force duration to the vibration period of the pendulum is small enough and the damping ratio is small enough.