Abstract
Due to the influence of various factors in the planar linkage mechanism, clearances will occur at the kinematic pair unavoidably. The existence of clearances will reduce the kinematic accuracy of mechanisms and have a great influence on reliability of mechanisms. At present, most of researches focus on static reliability of mechanisms or dynamic accuracy reliability of simple mechanisms with a single clearance, while the research on dynamic accuracy reliability of complex multi-link mechanism with several clearances is less. In this paper, a novel modeling and calculation method for dynamic accuracy reliability of complex multi-link mechanism with revolute clearances is proposed, and the impact of different factors on dynamic accuracy reliability of mechanism is researched. Taking 2-DOF 7-bar linkage mechanism as an example, a dynamic model with revolute clearances is derived, and the dynamic accuracy reliability model of mechanism is developed based on stress-strength interference theory. The impact of driving speed, clearance values and friction coefficient at the clearance on dynamic accuracy reliability of mechanism in different variation ranges is studied. The research can not only provide evidence for reliability design of the follow-up mechanism, but also has a reference significance for research on reliability of other mechanisms.
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