摘要
文中提出了一种异常值剔除结合分段小波降噪的实测轮轨廓形平滑方法;建立了某高速动车组拖车非线性动力学模型,通过降速法计算车辆蛇行运动临界速度;对比分析了采用小波降噪和样条拟合方法平滑轮轨廓形对轮轨接触几何关系和车辆蛇行运动的影响。结果表明:样条拟合参数选取不当会导致对原始廓形的欠拟合或过拟合;小波降噪能较好地去除廓形中的噪声和畸变点;合理的轮轨廓形平滑处理可提高动力学仿真效率和计算精度,蛇行运动分岔更符合实际运营情况。
This paper presents a smoothing method which combines outlier elimination and wavelet denoising for wheel/rail profile segments.A nonlinear dynamics model of a high-speed EMU is built,and the hunting of the vehicle system is obtained by continuously decreasing speed.The wavelet denoising algorithm and Simpack’s spline approximation algorithm are adopted to analyze the influence of smoothing methods on wheel/rail contact geometry and vehicle hunting.The results show that the improper spline approximation parameters would lead to underfitting or overfitting the measured profiles.Wavelet denoising can better remove noise and distortion points of the wheel/rail profiles.The proper wheel/rail profile smoothing algorithm can improve the computational efficiency and accuracy in dynamics simulations,and the hunting bifurcation of the vehicle is more consistent with the actual operation.
作者
姜成英
罗仁
JIANG Chengying;LUO Ren(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031 Sichuan,China)
出处
《铁道机车车辆》
北大核心
2023年第3期1-8,共8页
Railway Locomotive & Car
基金
国家自然科学基金(11790282)。
关键词
高速动车组
轮轨廓形
平滑方法
轮轨接触关系
蛇行运动分岔
High-speed train
wheel/rail profiles
smoothing method
wheel/rail contact relationship
hunting bifurcation
