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Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (16): 229779-229779.doi: 10.7527/S1000-6893.2023.29779

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles    

Longitudinal dynamics modeling and braking performance of towbarless aircraft taxiing system on wet roads

Hengjia ZHU1,2,3, Kai QI2,4, Liwen WANG2,5, Wei ZHANG2,3,5()   

  1. 1.College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China
    2.Aviation Special Ground Equipment Research Base,CAAC,Tianjin 300300,China
    3.Key Laboratory of Smart Airport Theory and System,CAAC,Tianjin 300300,China
    4.College of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China
    5.Research Institute of Science and Technology,Civil Aviation University of China,Tianjin 300300,China
  • Received:2023-10-30 Revised:2023-12-11 Accepted:2024-02-05 Online:2024-03-14 Published:2024-03-14
  • Contact: Wei ZHANG E-mail:weizhang@cauc.edu.cn
  • Supported by:
    National Natural Science Foundation of China(12002367);Fundamental Research Funds for the Central Universities(3122022066);Experimental Technology Innovation Fund of Civil Aviation University of China(2022CXJJ89)

Abstract:

Aircraft apron ground operation involves three cases: low-speed (less than 6 kn), middle-speed (6–14 kn), and high-speed (more than 14 kn)(1 kn=1.852 km/h). Compared to the traditional low-speed aircraft towing operation, the traction velocity in the new-generation towbarless aircraft taxiing mode can reach 40 km/h. In this case, wet roads have a significant influence on the braking performance of the Towbarless Aircraft Taxiing System (TLATS). The “pseudo” flow dynamic pressure bearing effect is used as equivalent interaction among the tire, water film and road, and an advanced LuGre tire hydroplaning dynamic model is developed by combining the arbitrary pressure distribution function. The wet road tire adhesion experiments are conducted for a specific tire of the AM210 Towbarless Towing Vehicle (TLTV), and the LuGre tire hydrodynamic model parameters are identified based on the experimental results. A co-simulation dynamic model of the LuGre tire hydrodynamic model in MATLAB/Simulink and the TLATS in Adams/View is established. Employing the same fuzzy PID optimal slip rate control method and considering the rough road vibration excitation, the braking performance of the TLATS under wet road conditions with those under dry road conditions is compared. Results show that the vertical tire dynamic load under wet road conditions is smaller than that under dry road conditions, and the tire grip performance decreases with increase in the water film thickness. The braking distances for class A and class C roads with 1 mm water film thickness increase by 30.9% and 31.3%, respectively, compared to that under dry rough roads with an initial braking speed of 40 km/h. The braking distances of 1 mm water film thickness increase by 2.7% and 2.5%, respectively compared to that of 0.5 mm water film thickness under corresponding working conditions. The results could provide a theoretical basis for accurate prediction of safe braking distances on wet roads in aircraft towing operations.

Key words: Towbarless Aircraft Taxiing System (TLATS), Towbarless Towing Vechicle (TLTV), wet road, tire dynamic model, braking dynamics

CLC Number: