Determining the root causes of various noise, vibration and harshness phenomena in modern automotive drivetrains is a critical task for industry, since noise, vibration and harshness issues often result in worsened driving experience. The aim of the current research is to investigate the dynamics during dry clutch engagement and the associated – often problematic – oscillations. This paper reports the development and partial validation of numerical models to study dry clutch behaviour. The models are used to investigate the influence of clutch and throttle actuation on the occurrence of unwanted clutch oscillations. The dynamic coefficient of friction between the clutch interacting surfaces was measured using a pin-on-disc rig under different slip speeds and contact pressure conditions, which are representative of a typical clutch engagement manoeuvre. The paper highlights the occurrence of instability issues in clutch dynamics (disc radial mode) as potential generators of aggressive noise, vibration and harshness, particularly during two different clutch pedal actuations. Such analysis has not hitherto been reported in the open literature.

中文翻译：

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干式离合器接合振荡期间的噪音、振动和粗糙度

确定现代汽车传动系统中各种噪声、振动和声振粗糙度现象的根本原因是工业的一项关键任务，因为噪声、振动和声振粗糙度问题通常会导致驾驶体验变差。当前研究的目的是研究干式离合器接合期间的动力学以及相关的（通常是有问题的）振荡。本文报告了研究干式离合器行为的数值模型的开发和部分验证。这些模型用于研究离合器和油门驱动对不必要的离合器振荡发生的影响。在不同的滑动速度和接触压力条件下，使用销盘式钻机测量离合器相互作用表面之间的动态摩擦系数，这是典型的离合器接合操作的代表。该论文强调了离合器动力学（盘径向模式）中的不稳定问题的发生，因为它是侵略性噪声、振动和粗糙度的潜在发生器，特别是在两种不同的离合器踏板驱动期间。迄今为止，公开文献中还没有报道过这种分析。