关键词: 车辆工程, 行驶工况, 零部件, 疲劳寿命, 雨流计数法, 耐久性测试工况

Abstract: Aiming at the problem that the acquisition process of automobile components durability test condition was complex, a method to analyze the components durability test condition through the actual driving condition was proposed. Based on the actual operation data of a pure electric bus in Xi’an, the driving condition was constructed. According to the actual parameters of the vehicle, the vehicle simulation model was established, and the stress load condition of the motor output shaft based on the actual driving condition was simulated and calculated. The damage calculation method of motor output shaft under different load was obtained according to the liner fatigue cumulative damage theory and the material S-N curve of motor output shaft. The four-peak-valley rain-flow counting method was used to calculate the damage of motor output shaft under different stress load conditions, and the corresponding cycle life was obtained. The motor speed condition and torque condition corresponding to driving cycle with the shortest life were selected as the motor output shaft durability test condition.

Key words: vehicle engineering, driving condition, components, fatigue life, rain-flow counting method, durability test condition