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An abnormal carbody swaying of intercity EMU train caused by low wheel-rail equivalent conicity and damping force unloading of yaw damper

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Railway Engineering Science 2023年第3期31卷 252-268页

作者： Yixiao Li Maoru Chi Zhaotuan Guo Shulin Liang State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

Low-frequency carbody swaying phenomenon often occurs to railway vehicles due to hunting instability,which seriously deteriorates the ride comfort of *** paper investigates low-frequency carbody swaying through experimental analysis and numerical *** the tests,the carbody acceleration,the wheel-rail profiles,and the dynamic characteristics of dampers were measured to understand the characteristics of the abnormal carbody vibration and to find out its primary *** and nonlinear numerical simulations on the mechanism and optimization measures were carried out to solve this carbody swaying *** results showed that the carbody swaying is the manifest of carbody hunting *** low equivalent conicity and the decrease of dynamic damping of the yaw damper are probably the cause of this *** optimization measures to increase the equivalent conicity and dynamic damping of the yaw damper were put forward and verified by on-track *** results of this study could enrich the knowledge of carbody hunting and provide a reference for solving abnormal carbody vibrations.

关键词： Low-frequency carbody swaying Intercity EMU equivalent conicity Damping characteristics Test verification

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Influence of Vehicle Parameters on Critical Hunting Speed Based on Ruzicka Model

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Chinese Journal of Mechanical Engineering 2012年第3期25卷 536-542页

作者： CUI Dabin LI Li JIN Xuesong XIAO Xinbiao DING Junjun School of Mechanical Engineering Southwest Jiaotong University Chengdu 610031 China State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China

While introducing foreign advanced technology and cooperating with Chinese famous research institutes,the high-speed vehicles are designed and take the major task of passenger transport in *** high-speed vehicle,the characteristic of shock absorber is an important parameter which determines overall behavior of the *** most existing researches neglect the influence of the series stiffness of the shock absorber on the vehicle dynamic behavior and have one-sided views on the equivalent conicity of wheel *** this paper,a high speed passenger vehicle in China is modeled to investigate the effect of the parameters taking series hydraulic shock absorber stiffness into consideration on Ruzicka *** the vehicle dynamic model,the effect of main suspension parameters on critical speed is *** order to verify the reasonableness of shock absorber parameter settings,vibration isolation characteristics are calculated and the relationship between suspension parameters and the vehicle critical hunting speed is *** study the influence of equivalent conicity on vehicle dynamic behavior,a series of wheel treads with different conicities are set and the vehicle critical hunting speeds with different wheel treads are *** discipline between the equivalent conicity of wheel tread and critical speed are obtained in vehicle nonlinear *** research results show that the critical speed of vehicle much depends on wheelset positioning stiffness and anti-hunting motion damper,and the series stiffness produces notable effect on the vehicle dynamic *** critical speed has a peak value with the equivalent conicity increasing,which is different from the traditional opinion in which the critical speed will decrease with the conicity *** relationship between critical speed and conicity of wheel tread is effected by the suspension parameters of the *** study results obtained offer a method and useful data to designing the

关键词： high-speed vehicle critical hunting speed suspension system equivalent conicity

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A framework for train derailment risk analysis

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Journal of Central South University 2019年第7期26卷 1874-1885页

作者： CHUNG Ming-hwa CHANG Che-hao CHANG Kuan-yuan WU Yu-shiang GAO Shih-feng SHEN Zhe-ping Graduate Institution of Engineering Technology-doctoral National Taipei University of Technology Taipei China Department of Civil Engineering National Taipei University of Technology Taipei China Department of Mechanical Engineering China University of Science and Technology Taipei China Department of Construction and Spatial Design Tungnan University New Taipei China

This study aims to develop a framework based on the Nadal formula to assess train derailment risk. Monte Carlo simulation was adopted to develop 10000 sets of random parameters to assess train derailment risk subject to the curvature radius of the track, the difference between the flange angle and the equivalent conicity, and accelerations from 250 to 989.22 gal during horizontal earthquake. The results indicated that railway in Taiwan, China has no derailment risk under normal conditions. However, when earthquakes occur, the derailment risk increases with the unloading factor which is caused by seismic force. The results also show that equivalent conicity increases derailment risk;as a result, equivalent conicity should be listed as one of maintenance priorities. In addition, among all train derailment factors, flange angle, equivalent conicity and unload factors are the most significant ones.

关键词： derailment performance flange angle equivalent conicity reliability risk earthquake

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Typical wheel–rail profile change rules and matching characteristics of high speed railway in China

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Railway Sciences 2022年第2期1卷 289-306页

作者： Maorui Hou Fengshou Liu Xiaoyi Hu Railway Science and Technology Research and Development Center China Academy of Railway Sciences Corporation LimitedBeijingChina Metals and Chemistry Research Institute China Academy of Railway Sciences Corporation LimitedBeijingChina

Purpose–In order to systematically grasp the changes and matching characteristics of wheel and rail profiles of high speed railway(HSR)in China,172 rail profile measurement points and 384 wheels of 6 high-speed electric motive unites(EMUs)were selected on 6 typical HSR lines,including Beijing–Shanghai,Wuhan–Guangzhou,Harbin–Dalian,Lanzhou–Xinjiang,Guiyang–Guangzhou and Dandong–Dalian for a two-year field ***/methodology/approach–Based on the measured data,the characteristics of rail and wheel wear were analyzed by mathematical statistics *** equivalent conicity of wheel and rail matching in a wheel reprofiling cycle was analyzed by using the measured rail ***–Results showed that when the curve radius of HSR was larger than 2,495 m,the wear rate of straight line and curve rail was almost the *** the line with annual traffic gross weight less than 11 Mt,the vertical wear of rail was less than 0.01 *** wear rate of the rail with the curve radius less than 800 m increased *** wheel tread wear of EMUs on Harbin–Dalian line,Lanzhou–Xinjiang line and Dandong–Dalian line was relatively large,and the average wear rate of tread was about 0.05–0.06 mm$(10,000 km)1,while that of Beijing–Shanghai line,Wuhan–Guangzhou line and Guiyang–Guangzhou line was about 0.03–0.035 mm$(10,000 km)*** the wear range was small,the equivalent conicity increased with the increase of wheel tread *** the wear range of wheel was wide,the wheel–rail contact points were evenly distributed,and the equivalent conicity did not increase ***/value–This research proposes the distribution range of the equivalent conicity in one reprofiling cycle of various EMU trains,which provides guidance for the condition-based wheel reprofiling.

关键词： High speed railway(HSR) Typical railway line Rail wear Wheel wear Wheel–rail interface equivalent conicity

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Wheel Profile Optimization of Speed-up Freight Train Based on Multi-population Genetic Algorithm

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Mechanical Engineering Science 2021年第1期3卷 28-38页

作者： Dabin CUI Pengcheng LEI Xing ZHANG Jingkang PENG School of Mechanical Engineering Southwest Jiaotong UniversityChengduChina

The geometric shape of the wheel tread is mathematically expressed,and geometric parameters affecting the shape of the wheel were extracted as design *** vehicle dynamics simulation model was established based on the vehicle suspension parameters and track conditions of the actual operation,and the comprehensive dynamic parameters of the vehicle were taken as the design *** matching performance of the wheel equivalent conicity with the vehicle and track parameters was discussed,and the best equivalent conicity was determined as the constraint condition of the optimization problem;a numerical calculation program is written to solve the optimization model based on a multi-population genetic *** results show that the algorithm has a fast calculation speed and good *** with the LM profile,the two optimized profiles effectively reduce the wheelset acceleration and improve the lateral stability of the bogie and vehicle stability during straight *** to the optimized profile increases the equivalent conicity under larger lateral displacement of the wheelset,the lateral wheel-rail force,derailment coefficient,wheel load reduction rate,and wear index are reduced when the train passes through the curve *** paper provides a feasible way to ensure the speed-up operation of a freight train.

关键词： Speed-up freight trains Wheel profile optimization Dynamic performance equivalent conicity

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