起落架落震试验中缓冲系统投放功量修正方法研究

Study on correction method for released energy of buffer system in the landing gear drop test

起落架落震试验中,投放功量与测试功量的比对用于验证测试系统是否正常,传统的投放功量的计算忽略了起落架弹性支撑质量与非弹性支撑质量重心位移不一致,导致投放功量的计算有一定的误差。建立起落架二质量模型,指出传统计算方法的不足,改进了投放功量的计算方法,并对比了落震试验中几种不同重量级的起落架在改进算法前后测试误差的区别。结果表明:测试误差修正前后的差值约0.15%~1.28%,在小型起落架落震试验中差异较大。同时,考虑了投放锁开锁延迟以及导轮与立柱摩擦带来的下沉速度损耗,对某型起落架落震试验中的下沉速度实时监测,提出了一种试验中适用的监测、修正下沉速度的试验方法,对比了下沉速度修正前后测试误差的变化,试验证明这种方法有效减少了测试误差,误差计算精度提高了约4%。

It is known that comparing the energy between released energy and measured energy in the landing gear drop test can verify whether the measuring system works properly or not.However,the traditional method to calculate the released energy neglected a fact that the supporting elastic displacement and inelastic displacement is not inconsistent,which causes some errors in the calculation.The current study makes adjustment to the method of calculating released energy and compares the errors of landing gears with different weight in the traditional method and correction method.Results obtained show that the difference before and after the correction method is about 0.15%to 1.28%and there is great difference between the error of micro landing gears in the traditional method and correction method.Meanwhile,considering the waste of subsidence velocity caused by the delay of released lock and friction between the impeller and pillar,the subsidence velocity in the landing gear drop test is monitored and an experiment method for monitoring and correcting subsidence velocity is proposed.The comparison of the errors between the test by traditional method and proposed method shows that the method can effectively reduce the error and improve the accuracy.