首页|Fracture mechanism of transmission spindle system for high-speed tracked vehicle
Fracture mechanism of transmission spindle system for high-speed tracked vehicle
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NSTL
Elsevier
? 2022 Elsevier LtdAccording to the traits of engine output torque and vehicle longitudinal dynamic model, considering the influence of the vehicle, the dynamic model of the transmission spindle system is established by using the lumped mass model, and the Runge–Kutta is used to solve the model under sinusoidal excitation and step excitation in starting stage, the time–frequency of transmission spindle under two kinds of excitation is analyzed. Modal analysis is used to decouple differential equations and solve the response of a single-degree-of-freedom system. The analytical approach and numerical solution are compared to each other to verify the correctness of the analysis method, the impact of rotating shaft torsional stiffness on the natural characteristics and dynamic load are analyzed, and the fracture mechanism of transmission spindle is further explored. The analysis results show that when the spindle stiffness is asymmetric, the sinusoidal excitation causes the dynamic load on both sides of the spindle and the driving force on both sides of the vehicle track to be inconsistent, the step excitation induces the second-order low-frequency resonance. Under the small damping, the vibration attenuation is slow, the right end of the spindle is broken under two combined excitations. When the stiffness of the spindle is symmetrical, the influence of sinusoidal excitation on both sides of the spindle is undifferentiated, and the vibration caused by step excitation decays quickly. Finally, the theoretical analysis results were confirmed by crack morphology, vehicle test data.
Fracture mechanismSinusoidal excitationStep excitationStiffness symmetryStructural design and optimizationTransmission spindle
Cui T.、Li Y.、Wang C.、Luo F.
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College of Mechanical and Vehicle Engineering Chongqing University
NSTL
Elsevier
