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Gear walk instability caused by brake-disc friction characteristics

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A multi-body dynamic rigid-flexible coupling model of landing gear is established to study the gear walk instability caused by the friction characteristics of the brake disc.After validat-ing the model with the experimental results,the influence of the landing gear structure and braking system parameters on gear walk is further investigated.Among the above factors,the slope of the graph for the friction coefficient of the brake disc and the relative velocity of brake stators and rotors is the most influential factor on gear walk instability.Phase trajectory analysis verifies that gear walk occurs when the coupling of multiple factors causes the system to exhibit an equivalent negative damping trend.To consider a more realistic braking case,a back propagation neural net-work method is employed to describe the nonlinear behavior of the friction coefficient of the brake disc.With the realistic nonlinear model of the friction coefficient,the maximum error in predicting the braking torque is less than 10％and the effect of the brake disc temperature on gear walk is performed.The results reveal that a more negative friction slope may contribute to a more severe unstable gear walk,and reducing the braking pressure is an effective approach to avoid gear walk,which provides help for future braking system design.

Gear walkFriction characteristics of brake discBrake-induced vibrationNegative dampingRigid-flexible couplingNegative slope of braking torque

Xiaoqiong DU、Bin LI、Wen CAI、Linyin LUO

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School of Aeronautics,Northwestern Polvtechnical University,Xi'an 710072,China

Department of Mechanical Engineering,University of Michigan,Ann Arbor 48109,USA

AVIC General Huanan Aircraft Industry Co.Ltd.,Zhuhai 519040,China

National Natural Science Foundation of ChinaProgram of Introducing Talents of Discipline to Universities,ChinaInnovation Foundation for Doctor Dissertation of Northwestern Polytechnical University,China

11872312BP0719007CX2022002

2024

10.1016/j.cja.2023.12.011

中国航空学报(英文版)
中国航空学会

中国航空学报(英文版)

CSTPCDEI
影响因子：0.847
ISSN：1000-9361
年,卷(期)：2024.37(2)
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