Dynamics Optimization Research and Dynamics Accuracy and Reliability Analysis of a Multi-Link Mechanism with Clearances

Abstract

With the development of high-speed and lightweight mechanisms, and the continuous improvement of manufacturing accuracy requirements in industrial production, clearance joints have increasingly become one of the key factors affecting dynamics performance. Poor clearance will seriously compromise stability, accuracy, and dynamics performance. Based on a genetic algorithm, an efficient modeling methodology for the dynamics optimization of a planar complex multi-link mechanism containing multiple clearance joints is put forward. The model comprises a 2-degree of freedom (DOF) nine-bar mechanism that can be used as the main transmission mechanism of a hybrid drive multi-link press, which is taken as the research object. The optimization objective is to minimize the maximum acceleration of the slider and minimize the difference between the actual central trajectory and the ideal trajectory. By optimizing the quality parameters of key components, an optimal solution for the design parameters is obtained, and the effects of the different optimizations of the objective functions on dynamics response are compared and analyzed. At the same time, a new modeling and calculation methodology of the dynamics accuracy and reliability of a complex multi-link mechanism in terms of multiple clearances is proposed, and the effect of optimization on dynamics accuracy and the reliability of the mechanism is analyzed. Based on the optimization results obtained by taking the minimum difference between the actual center trajectory and the ideal trajectory as an optimization objective, the nonlinear characteristics before and after optimization are analyzed through a phase diagram and Poincaré map. A test platform was built to study the dynamics of the mechanism with clearances. Research not only provides a basis for the dynamics optimization of a multi-link mechanism containing clearances but also provides reference significance for the reliability analysis of a multi-link mechanism containing clearances.

Modal Analysis of the Hydrodynamic Force of a Capsule in a Hydraulic Capsule Pipeline

“…Eng. 2023, 11, x FOR PEER REVIEW where h(t − τ) is the complex frequency response function [37]; τ is the re dτ is per unit time; ωn is the natural angular frequency (undamped system ural angular frequency (damped vibration); and ζ is the damp ratio.…”

Modeling and Analysis of the Flap Actuation System Considering the Nonlinear Factors of EMA, Joint Clearance and Flexibility

“…Song et al [34] found that when the link's flexibility was considered, the movement accuracy of a flexible parallel robot was reduced and the motion stability of the mechanism with flexible links was better than that only considering clearance joints. Jiang et al [35] proposed a modeling method for a multi-link mechanism considering the coupling effects of the clearance and flexibility, pointing out that the flexibility can effectively reduce the peaks of dynamic responses. Shen et al [36] established a dynamic model of a solar array system with flexible panels and clearance joints.…”

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