Fatigue Life Analysis of a Multi-layer Vertical Battery Rack Structure for a Commercial Vehicle
The commercial vehicle battery rack carried the power battery pack is an important component of the vehicle's power system.To verify whether the multi-layer vertical battery rack of a commercial vehicle meets the fatigue life requirements,based on the random vibration requirements of GB 38031-2020,a frequency response analysis model of the battery rack is established using the finite element method.The structural response stress in each direction is obtained through frequency response analysis,and the spectral width coefficient is calculated based on the stress power spectrum curve at the maximum output stress element.Based on this coefficient,the Dirlik life prediction model under the broadband method is determined.The fatigue life of the structure is analyzed using Goodman's modified S-N curve.The results show that the resonance between the first and second natural frequencies of the structure and the external excitation frequency causes the fatigue damage of the X and Y directions to exceed the standard.Subsequently,the structure is improved based on the modal analysis results,and the fatigue damage value of the battery rack under random vibration excitation finally meets the national standard.
random vibrationmulti-layer vertical battery rackcoefficient of spectral widthfatigue life
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