Optimal Chassis Suspension Design for Towbarless Towing Vehicle for Aircraft Taxiing

Zhu, Hengjia; Zhang, Baizhi; LV, Xiao; Qi, Kai; Zhang, Wei

doi:10.4271/2022-01-0291

Cited by 5 publications

References 20 publications

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Dynamic analysis of an aircraft towing slip-out system considering vertical wheel constraints

Lu,

Sun,

Tang

et al. 2024

Transportation Safety and Environment

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To analyze the vertical dynamic characteristics of the aircraft towing system under different constraints on the nose landing gear wheels of the aircraft during the towing slip-out mode, a dynamic model of the towing system considering the constraints between the clamping mechanism and the aircraft nose landing gear wheels was established based on the general towing system dynamic model. On this basis, an analysis was conducted to determine whether considering the aircraft wheel constraints affects the vertical vibration acceleration of the towing vehicle and the nose landing gear in low-speed (10 km/h) and high-speed (40 km/h) operating conditions. With the consideration of constraints at both ends of the aircraft wheels, the vertical acceleration of the towing vehicle's center of mass increased by 153% and 172% at low speed and high speed, respectively, compared to not considering the aircraft wheel constraints. Additionally, with the consideration of constraints at both ends of the aircraft wheels, the vertical acceleration of the nose landing gear's center of mass decreased to 20% and 57% at low speed and high speed, respectively, compared to not considering the aircraft wheel constraints. An analysis of the vertical vibration acceleration of the towing vehicle under different wheel constraint conditions found that the RMS value of the vertical vibration acceleration of the towing vehicle's center of mass was minimized when the clamping angles of the clamping mechanism to the nose landing gear wheels were 63° and 64°, respectively. Under this clamping angle, the influence of the clamping forces at both ends of the clamping mechanism on the vertical vibration acceleration of the towing vehicle was minimal. The research results provide valuable reference for the direct constraints between the clamping mechanism and the nose landing gear wheels in the aircraft towing slip-out system.

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Dynamic analysis of an aircraft towing slip-out system considering vertical wheel constraints

Lu,

Sun,

Tang

et al. 2024

Transportation Safety and Environment

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Modeling and braking analyses of longitudinal-vertical coupling towbarless aircraft taxiing system

Qi,

Wang,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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The variation of tire vertical load has effects on the vehicle braking performance, which may lead to the misjudgment of braking distance and increasement of the accident risks. In order to evaluate the braking distance of the towbarless aircraft taxiing system (TLATS) accurately, a longitudinal-vertical coupling model of the TLATS is established, in which the effects of the vertical vibration on braking dynamics is considered. An 11-degrees of freedom (DOF) dynamic model of the TLATS, which consists of the system longitudinal motion, vertical vibration, and an advanced Lugre tire model, is proposed. The tire vertical dynamic loads are obtained by calculating system vibration differential equations as the input for the Lugre tire model, in which an arbitrary pressure distribution function over the contact patch and load related parameters are used. The Lugre tire model parameters are identified based on the virtual experiment results in ADAMS/Car software through a multi-objective optimization (MOO) method. The proposed tire model is more accurate by comparing with the models using other pressure distribution functions. The advanced Lugre model is integrated into the longitudinal-vertical coupling dynamic model of the TLATS, and the fuzzy PID control method is used to achieve the optimal slip rate during the braking procedure. The tire friction and TLATS’s braking performances in terms of the slip rate, braking speed and braking distance are compared between the coupling and uncoupling models under different traction velocities and the road excitations when a same fuzzy control method is used for the system braking. The results show that the proposed longitudinal-vertical coupling TLATS dynamic model could assess the braking behaviors of the TLATS more accurately than the simplified uncoupling model, which could decrease the potential safety risk of the aircraft towing operation on the airport apron.

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A Novel Position and Posture Measuring Method in the Docking of the Towbarless Towing Vehicle and the Aircraft

Zhu¹,

Chao²,

Zhang³

2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Nowadays the ultrasonic radar, infrared detection, laser scanning radar or other perception technologies have been widely used in the automatic docking conditions. However, it’s not absolutely applicable in severe weather such as heavy rain and snow days, especially in the operation not allowed to fail, for example, the docking of the future unmanned towbarless towing vehicle (TLTV) with the expensive civil plane. A novel mechanism is proposed for relatively position and posture measuring between the TLTV and the aircraft nose tire during the automatic docking operation. The geometrical relationship between the towing vehicle and the nose tire is obtained by mathematical calculation. The position and posture of the nose tire have been obtained by splice angles and the length of rotatable rods connected with the vehicle during the docking operation.</div></div>

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Optimal Chassis Suspension Design for Towbarless Towing Vehicle for Aircraft Taxiing

Cited by 5 publications

References 20 publications

Dynamic analysis of an aircraft towing slip-out system considering vertical wheel constraints

Dynamic analysis of an aircraft towing slip-out system considering vertical wheel constraints

Modeling and braking analyses of longitudinal-vertical coupling towbarless aircraft taxiing system

A Novel Position and Posture Measuring Method in the Docking of the Towbarless Towing Vehicle and the Aircraft

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