舰载飞机着舰撞击载荷实测技术研究

针对国内飞机起落架载荷测量中普遍存在的静标动测问题,从理论和机理上分析了静标定的应变法实测动态载荷存在问题的原因。同时,考虑到舰载飞机因定点着舰方式遭受严重的动态载荷,重点研究了舰载飞机着舰撞击载荷的静标动测问题。通过动态落震试验模拟飞机着舰过程,根据测力平台的实测载荷分析,获取了应变法实测载荷精度受动态影响的程度,提出一种改进的惯性修正方法,即:通过落震试验数据辨识质量矩阵,通过辨识的质量矩阵和实测加速度修正应变法的实测载荷。试验结果表明,改进的惯性修正方法进一步提高了垂向载荷的测量精度,显著提高了航向和侧向载荷的实测精度。

A Measurement Technology of Impact Load on Shipborne Aircraft Landing

The common problem of static calibration and dynamic measurement remaining in domestic aircraft landing gear load measurement, the causes of static calibration in dynamic load measurement by strain method are analyzed theoretically and mechanically. At the same time, the focuses, in consideration of carrier based aircraft being subjected to severe dynamic loads due to fixed point landing, is on the static and dynamic measurement of impact loads on carrier based aircraft landing. By simulating the process of aircraft landing through dynamic drop tests and analyzing the measured load on the force measuring platform, the degree of influence of dynamic load on the accuracy of strain method measurement is obtained,and an improved inertia correction method is proposed. The identification of the mass matrix is done by the drop test data, and the correction of the measured load is made by the strain method through the identified mass matrix and measured acceleration. The experimental results show that the improved inertia correction method further improves the measurement accuracy of vertical loads and significantly improves the measurement accuracy of heading and lateral loads