| JNP3250 tipper has been used widely due to its carrying capacity larger and its easy to install and uninstall. Because its work environment is complex sites of the mine or civil engineering sites and et al. So its structure member is very prone to fatigue failure. As the most important carrying equipment of tipper, the subframe’s structural strength and other properties will affect the performance and service life of the whole vehicle directly. In this paper, JNP3250 heavy-duty tipper subframe produced by someone factory was as to the research object. ABAQUS finite element analysis software with experiment was used to carry out the calculation of static analysis and modal analysis. And proposing improvements to irrational parts of its structure and conducting secondary analysis based on comprehensive every analysis data. Ultimately, reasonable improvement program was determined. This provided a reference for subsequent production of enterprises.According to production drawings of the subframe were provided by the manufacturer, this paper established a finite element analysis model based on solid elements using the principles of appropriate simplify in the premise of little effect on the results of the analysis. Combined with the actual driving characteristics and standard test of the vehicle, the static analysis in bending condition, combined bending and torsion condition and unloading condition was done. The results showed that the maximum stress provided by subframe under a variety of conditions is less than its yield strength. It’s meet to the safety design requirements. To study the dynamic characteristics of the subframe, the free and constraint modal analysis were conducted combining with the actual installation conditions of the vehicle. The studies analysis under two modal showed that the natural frequency of the subframe is avoid to the various external excitation frequency and resonance phenomenon does not occur. However, static analysis and modal analysis displayed that former central tube beam of this subframe has shortcomings is related to the overall structure and it’s easy to arise safety accident after prolonged use. So it conducted improvement to the subframe structure based on the static and modal analysis data. And it carried out secondary analysis under static and modal to improved scheme. Through comparative analysis, the best optimization improvement scheme was selected. The improved structure has greatly increase in strength.It had a detaile exposition to research and analyse automotive subframe structure with finite element method. The data of study can provide support of theoretical and technology for further optimized and improved of the tipper subframe. The research process of thesis play a helpful role for further promote the application of CAE technology in the automotive industry. |
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