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以福建省龙岩G319典型事故黑点中心坑路段和小池岭路段为试验路段,设计了长下坡路段货车毂式制动器摩擦衬片温升规律实车试验方案。基于试验数据,结合有限元方法,分析了货车毂式制动器摩擦衬片在不同车辆载质量、制动方式和降温方式下的升温规律。试验结果表明:下坡时制动器摩擦衬片温度随制动行为的实施呈波动式增长;车辆总质量、摩擦衬片的使用性能和道路线形组合是影响摩擦衬片温度变化的重要因素;采用发动机挂低档制动与淋水制动能有效地减缓摩擦衬片温度的增长,实车制动行为与实际道路路况和线形组合关系密切,简单状态下的制动器有限元温度场模拟结果与实车试验结果相差较大。
Taking the black spot center pit section of G319 accident in Longyan, Fujian Province and the section of Xiaokeling section as the test section, the actual vehicle test program of the temperature rise of the friction linings of truck hub brakes on long downhill sections was designed. Based on the test data and the finite element method, the law of temperature rise of the friction linings of the truck hub brake under different vehicle mass, braking and cooling methods is analyzed. The experimental results show that the temperature of the friction linings fluctuates with the braking behavior. The total mass of the vehicle, the performance of the friction linings and the combination of road shape are the important factors that affect the temperature change of the friction linings. Hanging low braking and watering braking can effectively reduce the temperature increase of friction lining. The actual braking behavior is closely related to the actual road conditions and linear combination. The simulation result of the finite element temperature field of the brake under simple condition is in good agreement with the actual vehicle test The result is a big difference.