A Study on the Influence of Disturbance Factors’ Coupling Effects on the Dynamic Response of the Symmetrical Structure Press Mechanism

The dynamic response of symmetrical press mechanisms is severely affected by revolute clearance, translational clearance, and the elasticity of the components. Therefore, the coupling effects of disturbance factors were studied in this paper, including revolute clearance, translational clearance, and component elastic deformation; the influence of their coupling effects on the dynamic chaos characteristic are also discussed. A dynamic model of a rigid–flexible coupling mechanism with revolute clearance and translational clearance was established. Using MATLAB R2024a to solve the model, chaos identification was researched through phase diagrams, Poincaré maps, and maximum Lyapunov exponents. Under the parameters studied in this paper, the maximum Lyapunov exponents at revolute clearance A (X direction and Y direction) and translational clearance B (X direction and Y direction) were 0.0521, 0.0573, 0.3915, and −0.0287, respectively. The motion state of revolute pair A (X direction and Y direction) and translational pair B (X direction) were more prone to chaotic states; translational pair B (Y direction) was more prone to periodic motion. The influence of various factors on the dynamic response were analyzed. With the increase in driving speed and clearance value, as well as the decrease in friction coefficient, the stability of the mechanism weakened, and the vibration of the mechanism’s dynamic response intensified. This paper provides theoretical support for the establishment of precise dynamic models for multi-link symmetrical structure press mechanisms.