Analysis of nonlinear dynamics characteristics of a kind of hinged connection structures

• Published in: Archive of applied mechanics (1991) Vol. 93; no. 4; pp. 1725 - 1746
• Main Authors: Shi, Qingping, Zhao, Xueyan, Zhang, Haiyu, Si, Bingquan, Song, Zhenghe, Zhang, Youqiang
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-04-2023; Springer Nature B.V
• Subjects: Agricultural equipment; Classical Mechanics; Contact force; Dynamic structural analysis; Dynamical systems; Engineering; Excitation; Farm machinery; Fatigue life; Finite element method; Harvesters; Mathematical models; Nonlinear dynamics; Original; Stiffness; Theoretical and Applied Mechanics; Nonlinear dynamics; Hinged connections; Nonlinear contact forces; Hinge clearances
• ISSN: 0939-1533; 1432-0681
• DOI: 10.1007/s00419-022-02354-4

The hinged connections are widely used in agricultural machinery, such as the three-point hitch device at the rear of the tractor and the header position adjustment device of the corn harvester. The hinged connections in agricultural machinery allow relative rotations between the connected parts so that the positions of the agricultural equipment can be adjusted according to the operation requirements. Thus, the hinged connections are always subject to large and complex forces during operation, leading to complicated nonlinear vibrations, which significantly impact the operational performance and fatigue life of the agricultural machinery. Therefore, the nonlinear dynamics characteristics of the hinged connections in agricultural machinery are studied in this paper. Firstly, the parts connected by the hinge are simplified to the hinged beam structures according to the mechanical structure characteristics and loading features of the hinged connection structures in agricultural machinery. Then, the equivalent dynamics model of the hinged beam structure is established based on the nonlinear contact force model at the hinged connection and the finite element method. Finally, the effects of parameters such as hinge clearances, excitation frequencies, excitation amplitudes and hinge contact stiffness on the nonlinear dynamics characteristics of the hinged beam structures are analyzed by solving the dynamics responses of the system using numerical simulations. The research results can provide a reference for the optimal design of the hinged connection structures.