含有斜撑杆的单轮前起落架摆振稳定性分析  

Shimmy stability analysis of single wheel nose gear with side spar

作　　者：周家才 赵艳影[1] 王伟凯 肖相志 ZHOU Jiacai;ZHAO Yanying;WANG Weikai;XIAO Xiangzhi(College of Aircraft Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学飞行器工程学院,南昌330063

出　　处：《振动与冲击》2024年第15期235-243,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(12072140);江西省自然科学基金重点项目(20202ACBL201003)。

摘　　要：以某轻型飞机为研究对象,考虑起落架绕支柱轴线的扭转自由度、起落架支柱下端部产生侧向位移和轮胎侧向变形。基于线性假设,建立了含有斜撑杆和减摆器的单轮前起落架摆振动力学模型。推导出摆振临界速度和临界频率的解析解,研究各结构参数对摆振临界速度的响应曲线,对解析解与数值解的误差进行分析,证明了采用解析解分析起落架摆振的可靠性。分析斜撑杆侧向刚度、侧向阻尼系数和安装点到起落架安装点距离对摆振临界速度的影响。研究表明,不考虑斜撑杆参数将会放大摆振稳定性区域,依此设计的减摆器阻尼偏小,在摆振临界速度附近更易发生摆振现象。因此,在研究该类型的起落架摆振稳定性问题时,斜撑杆的参数影响不能忽略。Here,taking a certain light aircraft as the study object,considering torsional degree of freedom of landing gear around supporting axis,lateral displacement at lower end of landing gear pillar and lateral deformation of tire,based on the linear assumption,the shimmy dynamic model of a single wheel nose gear with diagonal brace and shimmy damper was established.The analytical solutions to shimmy critical speed and critical frequency were derived,response curves of various structural parameters to shimmy critical speed were studied and errors between analytical and numerical solutions were analyzed to prove the reliability of using analytical solutions to analyze landing gear shimmy.Effects of diagonal brace lateral stiffness,its lateral damping coefficient and distance from its installation point to landing gear installation point on shimmy critical speed were analyzed.The study showed that if parameters of diagonal brace are not considered,shimmy stability area can be enlarged,and damping of shimmy damper designed according to this is smaller,and shimmy phenomenon is easier to occur near shimmy critical speed;thus,when studying shimmy stability of this type landing gear,effects of diagonal brace parameters can’t be ignored.

关 键 词：起落架 摆振 稳定性 斜撑杆 

分 类 号：V226[航空宇航科学与技术—飞行器设计]