关键词: 起落架, 落震试验, 着陆载荷, 轮胎, 动力学

Abstract: The landing gear drop test is a crucial dynamic test for the landing gear. However, currently, the research general-ly only focuses on the load at the tire ground contact point, with very little attention paid to the load at the wheel axle point. The difference between the two has not been studied in detail. As the load directly transmitted upward to the aircraft body, the load at the wheel axle point is of greater value for the verification of the landing gear landing load on the design of the aircraft body load. Therefore, it is necessary to carry out research on the drop test considering the measurement of the wheel axle load. To this end, based on the development requirements of the oleo- pneumatic dual-wheel landing gear of a certain large civil aircraft: First, the characteristics of the landing loads are studied in combination with the principle of the drop test, and a method of using three-axis force sen-sors arranged at the hinge points to equivalently measure the load at the wheel axle point is proposed. Second, preliminary tests of vertical and horizontal loading are carried out to preliminarily verify the measurement effect of the load at the wheel axle center. Finally, formal drop tests under different rotational speed conditions are con-ducted, and from the perspective of the load difference between the wheel axle point and the ground contact point, the specific dynamic load data and other dynamic characteristics are analyzed in detail. This can provide a refer-ence for the subsequent improvement of the landing gear system design and test technology.

Key words: landing gear, drop test, landing loads, tire, dynamic