中文摘要：

针对起落架刹车抖振问题，以某半轴支柱式主起落架为对象，建立了该起落架的刚柔耦合动力学分析模型，进行了基本动力学模型校验，验证了模型的正确性和有效性。进而基于此模型建立了起落架刹车抖振动力学分析模型，并开展了起落架刹车抖振特性和参数影响研究。研究表明：起落架支柱刚度对起落架纵向刹车抖振现象影响较大，而结构阻尼、轮胎与地面之间摩擦系数对起落架刹车抖振现象影响较小。刹车力矩和刹车频率的增大都会使起落架纵向抖振现象趋于严重，当刹车频率从9Hz增大33％时，轮轴处纵向加速度增长400％以上，轮轴处纵向位移和载荷增大超过100％；当刹车力矩从9000N·m增加33％时，起落架纵向位移和轮轴处纵向载荷增大50％左右，轮轴处的纵向加速度增长率超过200％。

英文摘要：

A rigid-flexible coupling dynamic model of a half-axle main landing gear is built to study the low-frequency brake-induced vibration, namely, gear walk. The simulation results agree well with the experimental observations. This proves the validity of the landing gear dynamic model. With taking into account the longitudinal motion and the braking control system, a full analytical gear walk model is then established. Parameter study regarding landing gear structure and braking torque is conducted. The vibration characteristics are also analyzed. Results indicate that the strut stiffness is of significant influence on gear walk, while the structural damping and the friction coefficient between tire and ground show relatively small effect on it. With the increase of the amplitude and frequency of the braking torque, gear walk becomes more serious. 33% frequency increase leads to 400% increase of the longitudinal acceleration and 100% increase of the displacement and the load. 33% amplitude increase results in 200% increase of the acceleration and 50% increase of the displacement and the load.