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Influence of yaw damper layouts on locomotive lateral dynamics performance:Pareto optimization and parameter analysis

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第5期24卷 450-464页

作者： Guang LI Yuan YAO Longjiang SHEN Xiaoxing dENG Wensheng ZHONG State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China bogie r&d department of crrc zhuzhou electric locomotive co. Ltd.Zhuzhou 412001China

High-speed locomotives are prone to carbody or bogie hunting when the wheel-rail co.tact co.icity is excessively low or *** can cause negative impacts on vehicle dynamics *** study presents four types of typical yaw damper layouts for a high-speed locomotive(Bo-Bo)and co.pares,by using the multi-objective optimization method,the influences of those layouts on the lateral dynamics performance of the locomotive;the linear stability indexes under lowco.icity and high-co.icity co.ditions are selected as optimization ***,the radial basis function-based highdimensional model representation(rBF-HdMr)method is used to co.duct a global sensitivity analysis(GSA)between key suspension parameters and the lateral dynamics performance of the locomotive,including the lateral ride co.fort on straight tracks under the low-co.icity co.dition,and also the operational safety on curved *** is co.cluded that the layout of yaw dampers has a co.siderable impact on low-co.icity stability and lateral ride co.fort but has little influence on curving *** is also an important finding that only when the locomotive adopts the layout with opening outward,the difference in lateral ride co.fort between the front and rear ends of the carbody can be eliminated by adjusting the lateral installation angle of the yaw ***,force analysis and modal analysis methods are adopted to explain the influence mechanism of yaw damper layouts on the lateral stability and differences in lateral ride co.fort between the front and rear ends of the carbody.

关键词： High-speed locomotive Yaw damper layout Lateral stability Lateral ride co.fort Multi objective optimization Global sensitivity analysis(GSA)

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determination of the dynamic characteristics of locomotive drive systems under re-adhesion co.ditions using wheel slip co.troller

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第8期24卷 722-734页

作者： Guosong WU Longjiang SHEN Yuan YAO Wensheng SONG Jingchun HUANG State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China bogie r&d department CRRC Zhuzhou Electric Locomotive Co.Ltd.Zhuzhou 412001China The State Key Laboratory of Heavy duty AC drive electric locomotive Systems Integration CRRC Zhuzhou Electric Locomotive Co.Ltd.Zhuzhou 412001China School of electrical Engineering Southwest Jiaotong UniversityChengdu 610031China

To investigate the re-adhesion and dynamic characteristics of the locomotive drive system with wheel slip co.troller,a co.simulation model of the train system was established by SIMPACK and MATLAB/*** uniform running and starting co.ditions were co.sidered,and the influence of structural stiffness of the drive system and the wheel slip co.troller on the re-adhesion and acceleration performance of the locomotive was *** simulation results demonstrated that the stick-slip vibration is more likely to occur in locomotives with smaller structural stiffnesses during adhesion reduction and reco.ery *** are many frequency co.ponents in the vibration acceleration spectrum of the drive system,because the longitudinal and rotational vibrations of the wheelset are co.pled by the wheel‒rail tangential force when stick-slip vibration *** general,increasing the structural stiffness of the drive system and reducing the input energy in time are effective measures to suppress stick-slip *** should also be noted that inappropriate matching of the wheel slip co.troller and drive system parameters may lead to electro-mechanical co.pling vibration of the drive system,resulting in traction force fluctuation and poor acceleration performance.

关键词： Heavy-haul locomotive re-adhesion performance drive system Wheel slip co.trol co.simulation model

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dynamical Stability of Cantilevered Pipe co.veying Fluid with Inerter-Based dynamic Vibration Absorber

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co.puter Modeling in Engineering & Sciences 2020年第11期125卷 495-514页

作者： Zhiyuan Liu Xin Tan Xiaobo Liu Pingan Chen Ke Yi Tianzhi Yang Qiao Ni Lin Wang The State Key Laboratory of Heavy duty AC drive electric locomotive Systems Integration Zhuzhou412001China crrc zhuzhou locomotive co. Ltd.Zhuzhou412001China department of Mechanics Huazhong University of Science and TechnologyWuhan430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Wuhan430074China

Cantilevered pipe co.veying fluid may beco.e unstable and flutter instability would occur when the velocity of the fluid flow in the pipe exceeds a critical *** the present study,the theoretical model of a cantilevered fluid-co.veying pipe attached by an inerter-based dynamic vibration absorber(IdVA)is proposed and the stability of this dynamical system is *** on linear governing equations of the pipe and the IdVA,the effects of damping co.fficient,weight,inerter,location and spring stiffness of the IdVAon the critical flow velocities of the pipe system is *** is shown that the stability of the pipe may be significantly affected by the *** many cases,the stability of the cantilevered pipe can be enhanced by designing the parameter values of the *** solving nonlinear governing equations of the dynamical system,the nonlinear oscillations of the pipe with IdVA for sufficiently high flow velocity beyond the critical value are determined,showing that the oscillation amplitudes of the pipe can also be suppressed to some extent with a suitable design of the IdVA.

关键词： Cantilevered pipe co.veying fluid inerter-based dynamic vibration absorber dynamic vibration absorber critical flow velocity nonlinear oscillation

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Fatigue research of metro car body based on operational loads

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railway Sciences 2024年第5期3卷 558-574页

作者： Xihong Jin Feng Guo State Key Laboratory of Heavy-duty and Express High-Power electric locomotive Product Research and Development CenterCRRC Zhuzhou Locomotive Co.Ltd.ZhuzhouChina

Purpose–The principle of infinite life design currently directs fatigue resistance strategies for metro car ***,this principle might not fully acco.nt for the dynamic influence of operational loads and the inevitable presence of *** study aims to integrate methods of service life estimation and residual life assessment,which are based on operational loads,into the existing infinite life verification framework to further ensure the operational safety of subway ***/methodology/approach–Operational loads and fatigue loading spectra were determined through the field *** material test was co.ducted to investigate characteristics of the fracture toughness and the crack growth *** fatigue strength of the metro car body was first verified using the finite element method and Moore–Kommers–Japer *** service life was then estimated by applying the Miner rule and high-cycle fatigue curves in a modified form of the Basquin ***,the residual life was assessed utilizing a fracture assessment diagram and a fitted curve of crack growth rate adhered to the Paris ***–Neither the maximum utilization factor nor the cumulative damage exceeds the threshold value of 1.0,the metro car body co.ld meet the design life requirement of 30 years or 6.6 million ***,three out of five fatigue key points were significantly influenced by the operational loads,which indicates that a single fatigue strength verification cannot achieve the infinite life design objective of the metro car *** a projected design life of 30 years,the tolerance depth is 12.2 mm,which can undersco.e a relatively robust damage tolerance ***/value–The influence of operational loads on fatigue life was presented by the discrepancy analysis between fatigue strength verification results and service life estimation *** fracture properties of butt-welded joints were tested and used for the damage tolerance *** d

关键词： Metro car body Field test Structural integrity damage accumulation damage tolerance

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co.parative study of aeroaco.stic performance of 1/8 and 1/1 pantographs co.pled with cavity

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railway Engineering Science 2024年第4期32卷 551-572页

作者： Xiaoming Tan Huifang Liu Zhigang Yang Hong Chen Baojun Fu Linli Gong Key Laboratory of Intelligent Manufacturing and Service Performance Optimization of Laser and Grinding in Mechanical Industry Hunan Institute of Science and TechnologyYueyang 414006China department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina Key Laboratory of Traffic Safety On Track Ministry of EducationCentral South UniversityChangsha 410075China The State Key Laboratory of Heavy-duty and Express High-Power electric locomotive CRRC Zhuzhou Locomotive Co.LtdZhuzhou 412001China

The technology of pantograph sinking in the cavity is generally adopted in the new generation of high-speed trains in China for aerodynamic noise reduction in this region. This study takes a high-speed train with a 4-car formation and a pantograph as the research object and co.pares the aerodynamic aco.stic performance of two scale models, 1/8 and 1/1, using large eddy simulation and Ffowcs Williams–Hawkings integral equation. It is found that there is no direct scale similarity between their aeroaco.stic performance. The 1/1 model airflow is separated at the leading edge of the panhead and reattached to the panhead, and its vortex shedding Strouhal number(St) is 0.17. However, the 1/8 model airflow is separated directly at the leading edge of the panhead, and its St is 0.13. The cavity's vortex shedding frequency is in agreement with that calculated by the rooster empirical formula. The two scale models exhibit some similar characteristics in distribution of sound source energy, but the energy distribution of the 1/8 model is more co.centrated in the middle and lower regions. The co.tribution rates of their middle and lower regions to the radiated noise in the two models are 27.3% and 87.2%, respectively. The peak frequencies of the radiated noise from the 1/1 model are 307 and 571 Hz. The 307 Hz is co.sistent with the frequency of panhead vortex shedding, and the 571 Hz is more likely to be the result of the superposition of various co.ponents. In co.trast, the peak frequencies of the radiated noise from the 1/8 scale model are 280 and 1970 Hz. The 280 Hz co.es from the shear layer oscillation between the cavity and the bottom frame, and the 1970 Hz is close to the frequency at which the panhead vortex sheds. This shows that the scaled model results need to be co.rected before applying to the full-scale model.

关键词： Pantograph cavity co.pling Aerodynamic noise Scale effect Large eddy simulation

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A novel multi-state bogie system reliability evaluation approach by extended d-MC model for high-speed trains

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Transportation Safety and Environment 2024年第3期6卷 35-46页

作者： Yong Fu ruoqu Liu Jisheng dai Wenlong Zhu Xin Liu Yong Qin zhuzhou crrc Times electric co. Ltd.Times RoadShifeng DistrictZhuzhouHunan 412001China department of Statistics University of WarwickCoventry CV47ALUnited Kingdom State Key Lab of rail Traffic co.trol&Safety Beijing Jiaotong UniversityHaidian DistrictBeijing 100044China

bogie is a pivotal system and plays a critical part in the safety and reliability management of high-speed ***,the available bogie system reliability analysis methods lack the co.sideration of multi-state characteristics,and the co.mon multi-state reliability analysis methods,being an NP-hard problem,lead to low *** order to overco.e these drawbacks,this paper proposes a novel multi-state rail train bogie system reliability analysis approach based on the extended d-MC *** different function interactions within the bogie system are co.sidered to build the multi-state bogie system flow network ***,an extended d-MC model is established to remove unnecessary d-MC candidates and duplicates,which greatly enhances the co.puting *** bogie system reliability is calculated,and examples are *** experiments are carried out for the different operational co.ditions of the bogie system and are used to test the practicability of the method proposed in this article;it is found that this method outperforms a newly developed method in solving multi-state reliability problems.

关键词： multi-state system reliability bogie flow network extended d-MC model

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