Analysis on the Stress State of Cast Aluminum Beam of High Speed Train Based on Rigid-flexible Coupling Dynamic Model

doi:10.3901/JME.2020.02.138

Abstract

Abstract: A cast aluminum beam is a key bearing structure of a body-hung traction motor on a high speed train. The cast beam with complex geometric shape sustains the excitation from the elastic vibration of the car-body and motor torque at the same time. Moreover, investigation of the stress state in practical condition plays a significant role in predicting and monitoring the bearing safety of structures. With respect to simulation of the conditions on the Harbin-Dalian lines, car-body & cast beam models are established to compare the response of acceleration between rigid and flexible model. Low frequency rigid vibration modes can only be obtained via the rigid model. The elastic modal is excited with the line's excitation enhancement, higher mode response and vibration energy are shown in the flexible model. A dynamic test is conducted to validate the FE model of the beam, and transient simulation is performed considering the load from the dynamic simulations. The results illustrate positive correlation between beam loads and car-body vibration, the first vertical mode, motor torque and diamond mode result in higher vertical and lateral loads in multi lines conditions, respectively. The range of angles of the first principal stress in high stress areas of the beam is no more than 5 degree, which indicates semi-uniaxial stress status.

Key words: high speed train, cast aluminum beam, rigid-flexible coupling, elastic vibration, stress state

CLC Number:

TG156

DOU Weiyuan, ZHANG Lele, ZHANG Haifeng, LIU Changqing. Analysis on the Stress State of Cast Aluminum Beam of High Speed Train Based on Rigid-flexible Coupling Dynamic Model[J]. Journal of Mechanical Engineering, 2020, 56(2): 138-144.

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