Effects of clearance joint on impact dynamic characteristics of planar mechanisms

Here, the effects of clearance joint on impact dynamic characteristics of planar mechanisms were studied. At first, a line-contact impact joint model with axial sizes was established. Based on an improved nonlinear normal impact force model and a modified tangential Coulomb friction force model, the effect laws of clearances on impact dynamic characteristics of a planar slider-crank mechanism were studied through analyzing slider acceleration, clearance joint's contact force, acceleration frequency spectra and velocity-acceleration phase diagram under different clearances. The results showed that the larger the clearance, the bigger the oscillation amplitude of the mechanism's dynamic characteristics, and the lower the oscillation frequency; the larger the clearance, the more nonlinear the mechanism's dynamic characteristics.