Dynamic simulation and analysis of planar four-link mechanism with multi-clearance

In order to study the influence of multi-clearance on the dynamic performance of mechanism, a dynamic model with clearance of mechanism is established based on the system dynamics theory by combining the two-state clearance model of rotating pair. Based on the dynamic model, taking the planar four-link mechanism as the research object, the influence of position and quantity of clearance on acceleration and penetration depth of clearance joint are studied by using ADAMS simulation software. Taking the mean square deviation of rocker acceleration as the quantitative analysis index, all cases of clearance are analyzed quantitatively. The results show that clearance has a great influence on the acceleration of the mechanism. After the system is stabilized, the number and position of clearances will not change the motion state of the journal, and journal and bearing are always in contact. In the case of single clearance, the clearance joint closest to the motor position has the greatest influence on the dynamic response of the mechanism. There are complex coupling effects between multi-clearance joints, and the number of clearances is not the only factor affecting the dynamic performance of the mechanism. The research results have important theoretical guidance value for rational setting of mechanism clearance.