车辆脱轨安全限值的调整与改进建议

针对国家标准GB5599－85评判车辆脱轨所存在的问题，提出采用车轮抬升量作为车轮脱轨的直接判据。运用车辆－轨道耦合学理论，对我国主型货车C62A分别以单轮对－轨道耦合模型和整车－轨道耦合模型为仿真计算对象，研究了脱轨系数超限时间与车轮抬升量的关系。并对国家标准GB5599－85中关于脱轨系数和轮重减载率的规定作了调整和改进，建议将脱轨系数大于目标值1．0的持续作用时间小于0．035s作为车辆脱轨的安全限值。

Suggestions of Adjustment and Improvement on Vehicle Derailment Safety Limit Value

In this paper, aiming at the serious problems that exist in the Chinese current national standard, GB5599-85, the newest research results at home and abroad are consulted, the wheel vertical rise height is applied to be regard as direct distinguish evidence. The vehicle-track coupling dynamics theory is applied, aiming to Chinese leading type freight vehicle C62A, the single wheelset / track coupling model and the full-scale vehicle / track coupling model are acted as the objects of numerical simulation. The relation between the duration that derailment coefficient exceeds safety limit and wheel vertical rise height is researched in detail. Finally, the great adjustment and improvement advice on derailment coefficient and wheel weight decreasing rate in Chinese standard GB5599-85, is made, and it is suggested that the duration of derailment coefficient exceeding safety limit value should be shorter than 0.035s.