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针对雨刮器建立2自由度非线性摩擦振动动力学模型,基于复模态理论计算复特征值并进行稳定性及其对刮刷速度的依赖性分析;通过数值计算分析摩擦振动对刮刷速度的分岔特性,并利用相轨迹、庞加莱映射、频谱特性分析不同刮刷速度下的非线性振动现象.研究发现:摩擦-速度特性的负斜率是导致系统不稳定的根本原因,增大刮刷速度有利于提高系统的稳定性;在高、低刮速区,随着刮刷速度的下降,系统振动形态遵循周期→准周期→混沌的演化规律,并会伴随显著的粘滑振动;仅高速区的周期振动和非振动条件下,刮刷时无附加的粘滑振动.
A two-degree-of-freedom nonlinear friction and vibration dynamics model is established for the wiper blade. The complex eigenvalue is calculated based on the complex mode theory and its stability and its dependence on the wiping speed are analyzed. The numerical analysis of the frictional vibration on the wiping speed The characteristics of the chaos are analyzed by using the phase locus, the Poincaré mapping, and the spectral characteristics to analyze the nonlinear vibration phenomena under different squeegee velocities. It is found that the negative slope of the friction-velocity characteristic is the root cause of system instability, Speed is beneficial to improve the stability of the system. In the high and low scraping zone, with the decline of the scraping brush speed, the system vibration morphology follows the evolution law of periodic → quasi-periodic → chaos, accompanied by significant stick-slip vibration; District cycle vibration and non-vibration conditions, scraping brush no additional stick-slip vibration.