用于脉冲微推力器的枢轴式微冲量测量系统设计方法

Design method of micro-impulse measuring system based on pivots for pulsed micro-thruster

微冲量测量系统是研究脉冲微推力器推进性能的必备试验手段。提出了一种用于冲量测量的、通用的枢轴式扭摆测量系统的设计方法。首先,基于二阶振动系统微冲量测量模型,提出将冲量量程和误差限、测量噪声误差限、位移传感器量程和误差限作为基本设计条件;其次,根据冲量与系统响应之间关系、位移传感器测量扭转角方法以及冲量瞬间作用模型,提出了测量臂、力臂、扭转刚度系数、转动惯量等关键测量系统参数的约束条件;最后,通过建立基本设计条件与关键系统参数之间关系,给出了设计步骤。该设计方法可以用于星载脉冲微推力器冲量性能测量装置的设计,有很好的通用性和实用性。

Micro-impulse measuring system is the essential experimental support for pulsed micro-thruster development.An universal design method of micro-impulse measuring system based on pivots was put forward.Firstly,based on the second-order vibration system of micro-impulse measurement model,the basic design conditions were brought forward:the impulse measuring range and the corresponding error range,the measuring error range,the displacement sensor range and the corresponding error range.Secondly,according to the relationship between the impulse and the response,the torsional angle measuring method based on the displacement sensor and the impulse instantaneous impacting model,the constraint conditions of the system parameters,such as the measuring arm,the force applied arm,the torsional spring and the moment of inertia,were analyzed.Lastly,the design steps were given according to the relationship between the basic design conditions and the system parameters.The design method is appropriate for the impulse measuring system design for any pulsed micro-thruster,and has good universality and practicability.