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《Journal of Vibration and Shock》 2009-03
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Vibration fatigue analysis of a container flatcar based on rigid-flexible coupling simulation

PIAO Ming-wei,FANG Ji,ZHAO Qian-xu,ZHAO Wen-zhong(Machinery Eng.School,Dalian Jiaotong University,Dalian116028,China)  
In order to analysis influence level of structural vibration on fatigue life,a methodology of vibration fatigue analysis was presented based on rigid-flexible coupling simulation.With Interface Transaction Technical Strategy(ITTS) for a flex-body,the model of a rigid-flexible coupling system was established,in which the flex-body can produce the elastic vibration characterized by the relevant modal vibrations under dynamical constraint interactions.By Component Modal Synthesis(CMS) approach of stress recovery,the following analyses were carried out to determine fatigue quality and influence level of vibration: the correlation between dynamical stress and modal vibration,and the stress range histograms by which the amplitude and cycle number of stress of critcal points were contrasted statistically among multi-condition.For vertical vibration problem of a container flatcar,for instance,higher vertical acceleration,it was sured that under dynamical interaction of wedge's stick-slip friction,the flatcar produces an elastic vibration characterized by the 2nd vertical bending mode,which can be validated by a modal mass model and an attached mass one of the flatcar.According to the modal correlation analysis and the statistical contrast of stress range histogram for the cycle stress of crotical points,the vertical and lateral constraint forces of the container feets were the main causes of the large amplitude of the cycle stress of critcal points,and the influence level of structural vibration on fatigue life was up to(20-25)%.
【Fund】: 国家863高科技资助项目(编号:2006AA04Z160);; 辽宁省教育厅2007年创新团队项目(编号:2007T013)
【CateGory Index】: U270.1
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