Abstract:Taking the motor hanger of high-speed EMU as the research object, the plate spring force sensor of the motor hanger was made using load calibration method. The vertical load history of the motor hanger was obtained from line test. The test load was decomposed into the trend load and dynamic load. The load characteristics of the motor hanger under typical working conditions such as starting traction, high and low speed straight line with high and low speed, curve passing, braking and parking were analyzed combined with the vehicle gyroscope signal and the speed signal. On this basis, the load spectrum of the motor hanger were given, the characteristics of load amplitude and frequency in various conditions were analyzed. The variation rule of fatigue damage density and the damage distribution at all levels were analyzed. The results show that, the load of motor hanger is mainly composed of dynamic load caused by vibration and trend load caused by motor torque. Compared with 1 and 3 side of the motor hanger, 2 and 4 side of the motor hanger are greatly affected by the output torque of motor, especially in the condition of starting and braking. The load RMS value increased by 62% when the train speed increased from 195 km/h to 295 km/h. With the increase of the speed, the main vibration frequency of the motor hanger increases proportively. Under the same mileage, the damage density is the highest in the linear condition and the lowest in the starting condition. The damage of motor hanger is mainly caused by dynamic load, and the damage proportion is 99.6%. The damage caused by the load spectrum in the mid-amplitude region accounts for more than 93% of the total.
李俊杰,任尊松,魏雪. 高速动车组电机吊架载荷及损伤特性[J]. 振动与冲击, 2022, 41(9): 219-226.
LI Junjie, REN Zunsong, WEI Xue. Load and damage characteristics of motor hanger of high-speed EMU. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(9): 219-226.
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