【作者】 王婷；

【导师】 杨岳；

【作者基本信息】 中南大学 ， 交通运输工程， 2014， 硕士

【摘要】 摘要：随着铁路客车运行速度的不断提升,其运行安全性、舒适性己成为高速铁路客车动力学性能研究的重点。本文引入田口方法和6σ质量管理方法,开展高速铁路客车轴箱悬挂参数的稳健优化研究,即在外界不确定因素的影响下对车辆轴箱悬挂参数进行优化,降低车辆动力学性能对不确定因素随机波动的敏感性,对提升车辆运行安全性与舒适性具有直接指导作用。对高速铁路客车轴箱系统的结构、特点、组成进行了剖析。对高速铁路客车各组成部分及运动自由度进行了深入分析,构建了车辆多体系统的拓扑结构。基于SIMPACK软件建立了高速车辆多体动力学仿真模型。以轴箱悬挂参数为设计变量,对车辆动力学性能进行仿真,获得了轴箱悬挂参数对车辆平稳性、稳定性性能的影响规律。采用田口方法和多学科优化软件Isight,设计了Isight集成SIMPACK的轴箱悬挂参数田口稳健优化设计流程。以载客量、车速和轨道半径的波动为噪声因子,选取对车辆平稳性和稳定性影响较显著的轴箱悬挂参数作为可控因子,设计内外正交表对轴箱悬挂参数进行田口稳健性优化。通过信噪比(S/N)分析获得了面向车辆平稳性和稳定性的轴箱悬挂参数稳健优化组合,使得车辆的平稳性和稳定性均得到一定程度的提高,在外界因素影响下动力学性能更稳健可靠。在不考虑外界噪声因子影响下,以车辆运行平稳性和稳定性指标为目标,构建了以轴箱悬挂参数为设计变量的多目标优化模型。然后,考虑载客量、车速和曲线轨道半径的变化,引入6σ质量管理方法,构建了轴箱悬挂参数6σ多目标稳健优化模型。在Isight-SIMPACK集成环境下,实现了面向平稳性和稳定性双重目标的轴箱悬挂参数确定性优化和6σ稳健性优化。对比确定性优化和6σ稳健性优化后的运行平稳性和稳定性,结果表明轴箱悬挂参数6σ稳健优化在提高车辆动力学性能的基础上,使车辆动力学性能的稳健性也得到明显改善。采用蒙特卡罗模拟技术,对比分析了田口方法和6σ方法获得的轴箱悬挂结果对车辆运行平稳性和稳定性的稳健性影响。对比分析发现,利用6σ方法比田口方法获得的平稳性指标和稳定性指标的平均值和均方差更小。因而,6σ方法对高速客车轴箱悬挂参数稳健优化,车辆动力学性能更稳健可靠,抗干扰能力也更强。更多还原

【Abstract】 Abstract:With the increasing speed of the railway passenger train, safety and comfort have become the focus of research for dynamic performance of high-speed railway passenger train. In this dissertation, the robust optimization design on axlebox suspension parameters is carried out by taguchi method and six sigma method. Under the influence of uncertain factors, axlebox suspension parameters are optimized to reduce the sensitivity of dynamic performance. It has direct guidance to improve safety and comfort of vehicle.The structure, characteristics and composition of axlebox suspension system are dissected. Components and degree of freedom of high-speed passenger train are analysed, topological structure of vehicle multi-body system is established. Then multi-body dynamics simulation model of the high-speed vehicle is set up by SIMPACK. Axlebox suspension parameters are selected as design parameters, the influence rule, which the axlebox suspension parameters to stationarity and stability, is obtained by dynamics performance simulation.With taguchi method and multidisciplinary optimization software Isight, the process of taguchi robust optimization to axlebox suspension parameters is built by Isight integrating SIMPACK. Passenger capacity, speed and curve radius are selected as noise factors, the axle suspension parameters are selected as controllable factors, axlebox suspension parameters are optimized by taguchi robust optimization. The robust optimal solution of axlebox suspension parameters are obtained through the signal-to-noise ratio (S/N) analysis, stationarity and stability of the vehicle is improved. Under the influence of external factors, the vehicle dynamic performance is more stable and reliableWithout considering outside noise factors, stationarity and stability index are selected as the objective function, multi-objective optimization model is established. Then, considering passenger capacity, speed and curve radius, multi-objective robust optimization model is built by six sigma method. Under Isight-SIMPACK integration environment, deterministic optimization and six sigma robust optimization to axlebox suspension parameters are realized. Compared with the running stationarity and stability of deterministic optimization and six sigma robus optimization, the results show that six sigma robust optimization not only improve the vehicle dynamic performance,and make the robustness of vehicle dynamic performance obviously improved.With monte carlo simulation technique, axlebox suspension parameters which have been obtained by taguchi method and six sigma method to effect of stationarity and stability are compared. The results found that the mean and variance of stationarity and stability are smaller by six sigma method than taguchi method. The results show that the vehicle dynamic performance is more stable and reliable, and anti-interference ability is stronger by six sigma robust optimization design to axlebox suspension parameters of high speed passenger train.更多还原