Method for the posture control of bionic mechanical wheel-legged vehicles in hilly and mountainous areas

Authors

  • Kaoxin Pan 1.Key Laboratory of Modern Agricultural Intelligent Equipment in South China, Ministry of Agriculture and Rural Affairs, Guangdong 510630, China; 2.College of Engineering, China Agricultural University, Beijing 100083, China
  • Qing Zhang 1.Key Laboratory of Modern Agricultural Intelligent Equipment in South China, Ministry of Agriculture and Rural Affairs, Guangdong 510630, China; 2.College of Engineering, China Agricultural University, Beijing 100083, China
  • Zhenyu Wang 1. Key Laboratory of Modern Agricultural Intelligent Equipment in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510630, China; 2. College of Engineering, China Agricultural University, Beijing 100083, China
  • Sibo Wang 2. College of Engineering, China Agricultural University, Beijing 100083, China
  • Aobo Zhou 2. College of Engineering, China Agricultural University, Beijing 100083, China
  • Yong You 2. College of Engineering, China Agricultural University, Beijing 100083, China
  • Decheng Wang 2. College of Engineering, China Agricultural University, Beijing 100083, China

Keywords:

hilly areas, bionic machinery, wheel-legged vehicle, posture control, prototype testing

Abstract

In response to the weaknesses of traditional agricultural equipment chassis with poor environmental adaptability and inferior mobility, a novel unmanned agricultural machinery chassis has been developed that can operate stably and efficiently under various complex terrain conditions. Initially, a new wheel-legged structure was designed by drawing inspiration from the motion principles of grasshopper hind legs and combining them with pneumatic-hydraulic linkage mechanisms. Kinematic analysis was conducted on this wheel-legged configuration by utilizing the D-H parameter method, which revealed that its end effector has a travel range of 0-450 mm in the X-direction, 0-840 mm in the Y-direction, and 0-770 mm in the Z-direction, thereby providing the structural foundation for features such as independent four-wheel steering, adjustable wheel track, automatic vehicle body elevation adjustment, and maintaining a level body posture on different slopes. Subsequently, theoretical analysis and structural parameter calculations were completed to design each subsystem of the unmanned chassis. Further, kinematic analysis of the wheel-legged unmanned chassis was carried out using RecurDyn, which substantiated the feasibility of achieving functions like slope leveling and autonomous obstacle negotiation. An omnidirectional leveling control system was also established, taking into account factors such as pitch angle, roll angle, virtual leg deployment, and center of gravity height. Joint simulations using Adams and Matlab were performed on the wheel-legged unmanned chassis, comparing its leveling performance with that of a PID control system. The results indicated that the maximum absolute value of leveling error was 1.08° for the pitch angle and 1.19° for the roll angle, while the standard deviations were 0.21647° for the pitch angle and 0.17622° for the roll angle, demonstrating that the wheel-legged unmanned chassis surpassed the PID control system in leveling performance, thus validating the correctness and feasibility of its full-directional body posture leveling control in complex environments. Finally, the wheel-legged unmanned chassis was fabricated, assembled, and subjected to in-place leveling and ground clearance adjustment tests. The experimental outcomes showed that the vehicle was capable of achieving in-place leveling with response speed and leveling accuracy meeting practical operational requirements under the action of the posture control system. Moreover, the adjustable ground clearance proved sufficient to meet the demands of actual obstacle crossing scenarios. Keywords: hilly areas, bionic machinery, wheel-legged vehicle, posture control, prototype testing DOI: 10.25165/j.ijabe.20241705.8383 Citation: Pan K X, Zhang Q, Wang Z Y, Wang S B, Zhou A B, You Y, et al. Method for the posture control of bionic mechanical wheel-legged vehicles in hilly and mountainous areas. Int J Agric & Biol Eng, 2024; 17(5): 151-162.

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Published

2024-11-08

How to Cite

Pan, K., Zhang, Q., Wang, Z., Wang, S., Zhou, A., You, Y., & Wang, D. (2024). Method for the posture control of bionic mechanical wheel-legged vehicles in hilly and mountainous areas. International Journal of Agricultural and Biological Engineering, 17(5), 151–162. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/8383

Issue

Section

Power and Machinery Systems