雨刮器非线性黏滑振动及其对刮刷效果的影响

建立基于黏滑振动理论的雨刮器2自由度非线性动力学模型,通过数值计算的方法,利用分岔图和相轨迹证实刮刷过程中普遍存在的黏滑振动现象,并分析不同刮刷速度下的非线性黏滑振动特性;采用时间历程和等高线图分析黏滑振动的时空分布,通过占空比及对刮痕数量的定量统计,对刮刷效果进行评价分析.研究发现:不同刮刷速度下黏滑现象的发生及其振动特性具有复杂的非线性特征;当名义刮刷线速度大于0.725m·s-1时,无黏滑振动现象;提高刮刷速度能有效抑制黏滑振动的发生,减轻刮痕分布的不均匀性对刮刷效果的影响.

Nonlinear Stick slip Vibration and Its Influence on Wiping Effect of Automotive Wiper System

A 2 DOF nonlinear dynamic model of the automotive wiper system based on the theory of stick slip vibration was established. Bifurcation diagram and trajectories on the phase plane were adopted to confirm the pervasive phenomenon of stick slip vibration and to study its characteristics under various wiping velocities through numerical computation. Spatial and temporal distribution of stick slip vibration was analyzed by means of time histories and contour maps. Quantitative index of duty ratio of stick motion and quantity statistics of scraping were introduced to evaluate the wiping effect. The results indicate that the occurring of stick slip vibration and its characteristics under various wiping velocities possess complicated nonlinearity. The nonlinear stick slip vibration vanishes only when the nominal wiping velocity is higher than 0.725 m?s-1. Increasing the wiping velocity benefits the control of stick slip vibration and reduces the adverse influence on wiping effect caused by the heterogeneous distribution of scrapings.