The presence of clearances in mechanisms can result in the degradation of the performance of these devices. This question is investigated analytically with particular attention paid to the response of a slider-crank with clearances. The use of a simple model to predict the effects of clearances in planar mechanisms without the need for complex and exhaustive analysis is considered. It is shown that such a model, called an impact pair, will provide adequate design information for considering the effects of clearances.

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