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Oscillations in sliding with dry friction. Friction reduction by imposing synchronised normal load oscillations
International Journal of Engineering Science ( IF 5.7 ) Pub Date : 2020-06-10 , DOI: 10.1016/j.ijengsci.2020.103313
Elena Pasternak , Arcady Dyskin , Iulia Karachevtseva

Frictional sliding occurs in many engineering and natural systems across the scales. Often observed stick slip (jerking) movement is commonly believed to be a consequence of friction rate dependence (static friction is higher than the kinetic one). Using a simple model of a frictionally sliding block connected to a spring we show that even for constant friction the intrinsic velocity oscillations produce the movement pattern resembling stick slip. The rate dependence of friction, while changing the numbers produces qualitatively similar type of movement. The model also suggests that contrary to the common belief the rate dependence of friction is not a mechanism of sound production in bow musical instruments. Furthermore, the rate dependence reduces the clearness of sound producing unwanted harmonics. The alternating nature of the stationary and kinematic phases of stick-slip movement suggests a method of reducing energy dissipation rate. This can be achieved by applying synchronised normal oscillations such that the increases in the normal load fall on the stick phases of the sliding.



中文翻译:

在干摩擦条件下滑动的振荡。通过施加同步的正常负载振荡来减少摩擦

跨尺度的许多工程和自然系统中都发生摩擦滑动。通常认为观察到的粘滑(抽动)运动是摩擦速率依赖性的结果(静摩擦高于动摩擦)。使用连接到弹簧的摩擦滑块的简单模型,我们表明,即使对于恒定摩擦,固有速度振荡也会产生类似于粘滑的运动模式。摩擦的速率相关性在更改数字时会产生定性相似的运动类型。该模型还表明,与通常的看法相反,摩擦的速率依赖性不是弓弦乐器产生声音的机制。此外,速率依赖性降低了产生有害谐波的声音的清晰度。粘滑运动的静止和运动阶段的交替性质提示了一种降低能量耗散率的方法。这可以通过应用同步的正常振动来实现,以使正常负载的增加落在滑动的粘滞相上。

更新日期:2020-06-10
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