The Simulation of Metro Wheel Tread Temperature in Emergency Braking Condition

Abstract

To simulate the tread temperature rise of the working subway train in the process of its normal operation and to explore the temperature rise limit of wheel tread during operation, finite element numerical simulation was used. Based on heat transfer theory and finite element method, a three-dimensional finite element model of the subway wheel was created. According to the braking condition of one a straight road emergency braking and main line emergency braking, thermal simulation of wheel temperature field was conducted and finally the temp-rising law of the metro wheel was achieved. The results show that the wheel tread temperature first increased rapidly and then slowly decreased until the next brake in one emergency braking, with the temperature raised about 130°C in a single emergency braking and 157°C of the highest temperature. In several consecutive emergency braking processes, the braking heat accumulated in the wheel, with the overall temperature gradually increasing, then the overall temperature tended to be stable. The tread temperature reached its peak at3988s, with the highest temp reaching 372°C during the 31st braking process, not exceeding the limit of temperature rise (400°C).