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针对前起落架与飞机机体连接处局部刚度对起落架系统摆振稳定性影响的问题,以前起落架为研究对象,建立了考虑起落架与机体连接处局部刚度影响的起落架摆振分析模型,并采用复特征值优化法对摆振稳定性进行了计算与分析。最后,针对某轻型飞机前起落架,分析了机体连接处局部刚度对起落架系统摆振稳定性的影响,并通过物理试验验证了理论计算的正确性。研究表明:起落架与机体连接处局部刚度对起落架摆振稳定性影响比较明显;连接处局部刚度越小,系统所需临界阻尼越大,系统越不稳定;反之亦然;连接处局部刚度越小,系统摆振频率越小,反之亦然。在防摆设计时,应考虑起落架与机体连接处局部刚度与起落架侧向刚度之间的匹配关系。
Aiming at the problem of the influence of the local stiffness of the connection between the nose landing gear and the airplane body on the stability of the landing gear system, the former landing gear is taken as the research object. The landing gear shimmy analysis model is established considering the local stiffness of the connection between the landing gear and the airframe. And the complex eigenvalue optimization method was used to calculate and analyze the stability of the shimmy. Finally, aiming at the front landing gear of a light aircraft, the influence of the local stiffness of the junction on the stability of the landing gear system is analyzed. The correctness of the theoretical calculation is verified by physical experiments. The results show that the local stiffness of the landing gear to the body connection has an obvious influence on the stability of the landing gear. The smaller the local stiffness of the connection, the greater the critical damping required by the system, the more unstable the system and vice versa. The local stiffness The smaller the system shimmy frequency, and vice versa. In the pendulum design, the matching relationship between the local stiffness of the landing gear and the body connection and the lateral stiffness of the landing gear should be considered.