Fracture mechanism and structure optimization of the main shaft of an asymmetric transmission system

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (18) : 104-112.

CUI Tingqiong1，LI Yinong1，ZHANG Yuntao1，ZHANG Zhida1，LUO Fajiu1，WANG Cheng2

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Abstract

In view of the fracture failure of the transmission spindle of a special vehicle under starting condition, considering the internal and external multi-source excitation of the main shaft bearing system, the nonlinear dynamic model of the system is established by using the lumped mass method, and the Runge Kutta method is used to solve the problem. The time-domain and frequency-domain response of the system vibration dynamic load under the starting condition and the main reason of the fracture of the right side of the spindle are obtained. Aiming at the fracture reason of the spindle, the NSGA-II algorithm is used to optimize the structural parameters of the transmission spindle with the vibration dynamic load of the system as the optimization objective, and the Pareto optimal solution set obtained from the optimization is optimized by using the fuzzy set theory. The optimization results show that the torsional vibration response of the optimized transmission spindle can converge quickly under the starting condition, and the root mean square value of the torsional dynamic load at the left and right ends is reduced by 34.49% and 53.81% respectively, and the optimization effect is obvious. 
Key words: transmission spindle; fracture mechanism; multi-objective optimization; genetic algorithm

Key words

transmission spindle / fracture mechanism / multi-objective optimization / genetic algorithm

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CUI Tingqiong1，LI Yinong1，ZHANG Yuntao1，ZHANG Zhida1，LUO Fajiu1，WANG Cheng2. Fracture mechanism and structure optimization of the main shaft of an asymmetric transmission system[J]. Journal of Vibration and Shock, 2022, 41(18): 104-112

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