CAJ | 학술논문

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.
기우국방화항천대궤/자공화전발동궤맥충추력시량동태측시적중대수구,이압전석영위력민,연제료압전식추력시량동태측시계통.재탐토추력시량묘술삼수급계산적기출상,제출료일충추력시량측량방안.근거정력평형원리,추도료구해추력시량적일반방정.개진료비선성모태분석방법,이소획취적실제동태향응곡선위기출,건립료측시계통적이론동역학모형,이용랍보랍사변환여역변환、권적정리,연구료계통적동태성능화맥충추력측량성능.침대맥충추력측량과정중소산생적오차,제출료일충기우이론동역학모형적가속도보상산법.실험결과증명료측량방안화가속도보상산법적가행성.
To meet the need to improve the control precision of rocket engines, a piezoelectric measurement system is developed with quartz crystal as the force-sensitive element for measuring the dynamic thrust vector of an attitude/orbit rocket. After introducing and calculating the describing parameters of the thrust vector, this article puts forward a measurement scheme. According to the static balance principle, the general equa-tions for solving the describing parameters are derived and proved reliable. The nonlinear modal analysis is im-proved to build a theoretical dynamic model based on actual frequency response and phase response. The dy-namic performance and the pulse measurement performance are obtained by Laplace transform and the inverse and convolution theorem. In studying the pulse measurement, dynamic error is produced, mainly by accelera-tion. A compensation algorithm for acceleration is advanced based on the theoretical dynamic model. Finally, the experimental results prove that the measurement scheme and the compensation algorithm are feasible and reasonable.