The match relationship between rail and wheel was studied by investigating the behavior of the contact fatigue wear in rail/wheel systems.The hardnesses of samples were close or equal to that of the real rail and whee...The match relationship between rail and wheel was studied by investigating the behavior of the contact fatigue wear in rail/wheel systems.The hardnesses of samples were close or equal to that of the real rail and wheel.Meanwhile the probe of study went further into the condition match and the material match based on the hardness match.The experimental results show that the wear rate depends on the hardness ratio(H/H)between rail and wheel,and the safe value of H/Hequals 1.00-11.20.The fatigue life of materials relies on the operating conditions except hardness.The selected experimental conditions satisfy the condition match except Rheat-treated out-line.The factor H/Sis the main element effecting wears in rail steel and wheel steel.The nature of the hardness match is the microstructure match under specified operating conditions.展开更多
首先对欧洲国际铁路联盟(Union enternationale des chemins der fer,UIC)高速轮轨型面S1002/UIC60和我国准高速型面LMa/CHN60进行接触几何分析,认为LMa/CHN60型面共形度太低,对钢轨磨损以及滚动接触疲劳极为不利。以改善钢轨的受力状...首先对欧洲国际铁路联盟(Union enternationale des chemins der fer,UIC)高速轮轨型面S1002/UIC60和我国准高速型面LMa/CHN60进行接触几何分析,认为LMa/CHN60型面共形度太低,对钢轨磨损以及滚动接触疲劳极为不利。以改善钢轨的受力状态为出发点,在对钢轨型面扩展法进行数值研究的基础上,采用钢轨局部型面扩展法,根据我国60kg/m钢轨设计出共形度较高的车轮型面。通过车辆轨道耦合动力学仿真确定车辆临界速度约为400 km/h,且具有较好的曲线通过性能。轮轨非赫兹滚动接触分析表明,在靠近钢轨一侧接触斑面积、应力等较LMa型面变化不大的情况下,离开钢轨一侧接触斑面积明显增大,接触应力降低约20%,钢轨与车轮的接触带变宽,钢轨接触频次得到改善。在车轮型面优化设计做了尝试性工作,以期为我国高速、重载以及城市轨道交通车辆车轮型面优化设计提供借鉴。展开更多
China railway, as the essential infrastructure of China national economy, has to face and solve a lot of technical problems so as to cope with the strategic requirement of continuous, rapid and healthy development of ...China railway, as the essential infrastructure of China national economy, has to face and solve a lot of technical problems so as to cope with the strategic requirement of continuous, rapid and healthy development of national economy. The main issue is to raise passenger train speed and develop high-speed train operation technology. It involves such fields as locomotive and cars, signaling and communication, traffic organization, railway construction etc., it is a huge and complicated system engineering. In the system, railway track, bridge and tunnel are the running foundation of rapid and high-speed train, their quality directly affect the train speed and running quality, such as running stability, comfort and safety. So it is necessary to study the influence of track irregularity on train running quality and take effective measure to control track irregularity during the development of high-speed passenger train operation technology, for ensuring train running safety, extending the service-life of track and vehicle parts and improving train running stability and comfort. In view of the above-mentioned facts, the influence on running safety and stability of quasi & high-speed passenger car under track irregularity excitation is the topic of the thesis. Taking vehicle-track or vehicle-track-bridge vertical and lateral coupling system dynamic model as analytical method, the thesis systematically discusses dynamic behavior of quasi & high-speed vehicles excited by track irregularities of the ballast track, the influence on dynamic response of rail/wheel system excited by rail surface vertical short-wave roughness, serviceability of running vehicles on bridge under excitation of special track irregularities caused by bridge arch, pier uneven settlement and subsidence error between abutment and subgrade. Track irregularities are actually complicated random processes, consisting of approximately stationary ergodic processes of general track irregularities in entire length and non-stationary processes reflecting geome展开更多
基金Project Supported by the Economy&Trade Committee of China(950130440A)
文摘The match relationship between rail and wheel was studied by investigating the behavior of the contact fatigue wear in rail/wheel systems.The hardnesses of samples were close or equal to that of the real rail and wheel.Meanwhile the probe of study went further into the condition match and the material match based on the hardness match.The experimental results show that the wear rate depends on the hardness ratio(H/H)between rail and wheel,and the safe value of H/Hequals 1.00-11.20.The fatigue life of materials relies on the operating conditions except hardness.The selected experimental conditions satisfy the condition match except Rheat-treated out-line.The factor H/Sis the main element effecting wears in rail steel and wheel steel.The nature of the hardness match is the microstructure match under specified operating conditions.
文摘首先对欧洲国际铁路联盟(Union enternationale des chemins der fer,UIC)高速轮轨型面S1002/UIC60和我国准高速型面LMa/CHN60进行接触几何分析,认为LMa/CHN60型面共形度太低,对钢轨磨损以及滚动接触疲劳极为不利。以改善钢轨的受力状态为出发点,在对钢轨型面扩展法进行数值研究的基础上,采用钢轨局部型面扩展法,根据我国60kg/m钢轨设计出共形度较高的车轮型面。通过车辆轨道耦合动力学仿真确定车辆临界速度约为400 km/h,且具有较好的曲线通过性能。轮轨非赫兹滚动接触分析表明,在靠近钢轨一侧接触斑面积、应力等较LMa型面变化不大的情况下,离开钢轨一侧接触斑面积明显增大,接触应力降低约20%,钢轨与车轮的接触带变宽,钢轨接触频次得到改善。在车轮型面优化设计做了尝试性工作,以期为我国高速、重载以及城市轨道交通车辆车轮型面优化设计提供借鉴。
文摘China railway, as the essential infrastructure of China national economy, has to face and solve a lot of technical problems so as to cope with the strategic requirement of continuous, rapid and healthy development of national economy. The main issue is to raise passenger train speed and develop high-speed train operation technology. It involves such fields as locomotive and cars, signaling and communication, traffic organization, railway construction etc., it is a huge and complicated system engineering. In the system, railway track, bridge and tunnel are the running foundation of rapid and high-speed train, their quality directly affect the train speed and running quality, such as running stability, comfort and safety. So it is necessary to study the influence of track irregularity on train running quality and take effective measure to control track irregularity during the development of high-speed passenger train operation technology, for ensuring train running safety, extending the service-life of track and vehicle parts and improving train running stability and comfort. In view of the above-mentioned facts, the influence on running safety and stability of quasi & high-speed passenger car under track irregularity excitation is the topic of the thesis. Taking vehicle-track or vehicle-track-bridge vertical and lateral coupling system dynamic model as analytical method, the thesis systematically discusses dynamic behavior of quasi & high-speed vehicles excited by track irregularities of the ballast track, the influence on dynamic response of rail/wheel system excited by rail surface vertical short-wave roughness, serviceability of running vehicles on bridge under excitation of special track irregularities caused by bridge arch, pier uneven settlement and subsidence error between abutment and subgrade. Track irregularities are actually complicated random processes, consisting of approximately stationary ergodic processes of general track irregularities in entire length and non-stationary processes reflecting geome
