制动盘摩擦特性导致齿轮行走不稳定

IF 5.3 1区 工程技术 Q1 ENGINEERING, AEROSPACE Chinese Journal of Aeronautics Pub Date : 2023-12-13 DOI:10.1016/j.cja.2023.12.011
Xiaoqiong DU , Bin LI , Wen CAI , Linyin LUO
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引用次数: 0

摘要

建立了起落架多体动态刚柔耦合模型,以研究制动盘摩擦特性引起的齿轮行走不稳定性。在用实验结果验证模型后,进一步研究了起落架结构和制动系统参数对齿轮行走的影响。在上述因素中,制动盘摩擦系数与制动定子和转子相对速度的曲线斜率是对齿轮行走不稳定性影响最大的因素。相位轨迹分析证实,当多个因素的耦合导致系统呈现等效负阻尼趋势时,就会发生齿轮走行。为了考虑更现实的制动情况,采用了反向传播神经网络方法来描述制动盘摩擦系数的非线性行为。利用摩擦系数的现实非线性模型,预测制动扭矩的最大误差小于 10%,并研究了制动盘温度对齿轮行走的影响。结果表明,更负的摩擦斜率可能会导致更严重的不稳定走档,而降低制动压力是避免走档的有效方法,这为未来的制动系统设计提供了帮助。
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Gear walk instability caused by brake-disc friction characteristics

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 validating 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 network 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.

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来源期刊
Chinese Journal of Aeronautics
Chinese Journal of Aeronautics 工程技术-工程:宇航
CiteScore
10.00
自引率
17.50%
发文量
3080
审稿时长
55 days
期刊介绍: Chinese Journal of Aeronautics (CJA) is an open access, peer-reviewed international journal covering all aspects of aerospace engineering. The Journal reports the scientific and technological achievements and frontiers in aeronautic engineering and astronautic engineering, in both theory and practice, such as theoretical research articles, experiment ones, research notes, comprehensive reviews, technological briefs and other reports on the latest developments and everything related to the fields of aeronautics and astronautics, as well as those ground equipment concerned.
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