非线性振动下卸载系统动力学及运动学特性分析

针对散体物料与振动卸载面间的摩擦、碰撞等相互作用导致的散体复杂运动行为或磨损等问题，基于库仑摩擦力模型及碰撞理论，建立具有非线性振动的卸载系统动力学模型.采用增量谐波平衡法和数值积分法，分别研究激励幅值和刚度比对系统动态特性、振动传递和散体物料流动规律的影响.结果表明，随着激励幅值和刚度比的增大，卸载系统的硬式非线性增强、多解区域变宽、力传递率减小并出现明显的延迟现象；由于轮胎及悬架非线性因素的影响，在相同工况下散体物料呈现出不同的流动状态，并且在跳跃、冲击后出现相对静止和相对前滑等现象.

Dynamic and Kinematic Characteristics Analysis for Unloading System Under Nonlinear Vibration

Aiming at the complex motion state and wear problems of the granules due to the interaction with friction and collision between the granules and the vibration of unloading surfaces， the dynamic model of the unloading system considering nonlinear vibration was proposed based on the Coulomb friction model and collision theory. The effects of excitation amplitude and stiffness ratio on dynamic characteristics， vibration transmission and flow regularity of granules were analyzed by utilizing the incremental harmonic balance method and numerical integration method. The results showed that the hardening nonlinear behavior strengthens， the multi-solution region widens， the force transmissibility decreases and the delay phenomenon appears with the increase of excitation amplitude and stiffness ratio. Different flow state of granules are observed under the same operating condition， and relative rest and forward sliding motion occur after jump and collision due to the influence of nonlinear factor of tire and suspension.