基于粘弹性杆的摇臂式起落架着陆响应分析

Analysis of Landing Response of Articulated Landing Gear Based on Viscoelastic Rod

摇臂式起落架作为起落架的重要形式,对其进行着陆响应分析可为起落架缓冲性能评估提供理论依据和参考。应用粘弹性杆建立摇臂式起落架结构动力学简化模型,并采用MATLAB程序建立线性与非线性摇臂式起落架数值求解模型;应用ANSYS/LS-DYNA显式动力学求解技术进行起落架着陆响应分析;对比研究起落架上端节点的载荷历程曲线、位移历程曲线及输出功量曲线。结果表明:着陆过程中载荷曲线和位移曲线收敛过程较短,曲线较为平滑,说明着陆过程较为平缓;从功量曲线的吸能面积比率可知缓冲器的吸能效率较高。研究结果对起落架系统缓冲性能的初步分析以及机身连接处接头细节设计的载荷输入具有积极的参考价值。

As an important form of the landing gear, the articulated landing gear＇s dynamic response analysis of- fers the theoretical foundation and reference for the performance evaluation of landing gear system. The simpli- fied modeling method for structural dynamics analysis of landing gear is proposed based on viscoelastic rod tech- nique. Then, the linear and nonlinear analytical models of the landing gear buffer system are derived. And the response curves of the landing gear are obtained by the MATLAB program. Moreover, ANSYS/I.S-DYNA is used to analyze the landing response of diagonal stanchion landing gear. Finally, the load and displacement curves of the landing gear are obtained, based on these two curves, the energy absorb chart is fitted. Results show that the displacement curve and load curve convergent quickly, which means the process of landing is rela- tively gentle. Through the energy absorb chart it can be concluded that the buffer system of landing gear is of high efficiency, which validates the simplified modeling technique. The result is valuable for studying on the de- sign load of the connection structure.