Dynamic Modeling and Analysis of Loader Working Mechanism Considering Cooperative Motion with the Vehicle Body

Guodong Liang; Li Liu; Yu Meng; Yanhui Chen; Guoxing Bai; Huazhen Fang

doi:10.3390/machines11010009

Machines (Dec 2022)

Dynamic Modeling and Analysis of Loader Working Mechanism Considering Cooperative Motion with the Vehicle Body

Guodong Liang,
Li Liu,
Yu Meng,
Yanhui Chen,
Guoxing Bai,
Huazhen Fang

Affiliations

Guodong Liang: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Li Liu: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Yu Meng: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Yanhui Chen: School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China
Guoxing Bai: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Huazhen Fang: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China

DOI: https://doi.org/10.3390/machines11010009
Journal volume & issue: Vol. 11, no. 1
p. 9

Abstract

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Achieving precise load detection for Intelligent Loaders is an important task, which directly affects the operation energy efficiency and the fatigue life analysis for the loader’s working mechanism. The operation of the mechanism is regarded as a 3-DOF (degree of freedom) planar motion process coordinated with the vehicle body. Affected by complex dynamic coupling in motion, the existing dynamic models of the mechanism have the problem of insufficient accuracy, which is not conducive to the precise calculation of load. Taking the reverse six-linkage loader as the research object, an accurate dynamic model of the mechanism is established considering its cooperative motion with the vehicle body. Firstly, the kinematic description of the mechanism is given by the Rodriguez method. Then, to overcome the coupling effect caused by the cooperative motion, the sufficient inertia forces of the mechanism are established in joint space using the Lagrange method. Furthermore, to overcome the coupling effect caused by the complex structure, the Newton–Euler method is used to establish the force mapping relations between the joint space and the drive space by multi-body modeling. Finally, the dynamic model of the mechanism in drive space is obtained, and the specific mapping relations between the bucket force, the vehicle driving force, and the drive parameters are given. Compared with existing dynamic models in simulation, the analysis shows that the average and maximum absolute errors of the vehicle driving force calculated by the established model do not exceed 20% of the existing model errors, and the corresponding errors of the bucket force do not exceed 10% of the existing model errors, which proves that the motions of vehicle body and front-end mechanism, as well as the force of the tilt hydraulic cylinder, play important roles in improving the model accuracy. The established model is superior to existing models and is more suitable for cooperative motion with the vehicle body.

Published in Machines

ISSN: 2075-1702 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mechanical engineering and machinery
Website: http://www.mdpi.com/journal/machines

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