一种改进的航空发动机高空模拟试验推力测量方法

为满足航空发动机高空模拟试验中推力高精度、快速测量要求,提出一种改进的推力测量方法。建立高空模拟试验推力测量稳态模型和动态模型,对试验振动的影响进行了仿真分析和试验验证,提出了对测量动架振动进行在线补偿的动态推力测量方法。从测量不确定度评估入手,讨论了动态推力测量方法在不确定度方面的局限性,提出了基于数字滤波的稳态推力测量方法。根据两种方法的特点,采用优选算法,在发动机过渡态时输出动态推力测量结果,在发动机稳态时输出稳态推力滤波结果。在发动机高空台试验中的检验结果表明,该方法能实现推力的高精度、快速测量。

An improved method of aero-engine thrust measurement in altitude simulation test

In order to realize high precision and fast thrust measurement in aero-engine high altitude simu lation test,an improved thrust measurement method was proposed.Steady model and dynamic model of thrust measurement were established,and simulation analysis and experimental test were carried out to vali date the influence of vibration on thrust measurement.A dynamic thrust measurement method was pro posed,which compensated the thrust on line through the bench vibration measurement result.In addition,due to the uncertainty of dynamic thrust measurement method,a steady thrust measurement method based on digital filter was proposed.According to the characteristics of the two methods,using the optimization al gorithm,the dynamic thrust measurement results were output during the dynamic process,and the steady thrust filter results were output in a steady state.Finally,the altitude simulation test results show that the method can achieve high precision and fast measurement of thrust.