【摘要】 本文建立了一种V型发动机机体板梁组合的有限元模型和应力分析模型，确定了动态分析、静态分析和局部应力分析的边界条件，并用动态分析的结果和动态分析试验结果的比较来修改有限元模型.计算了机体的固有频率、振型应力及应变；通过对计算机结果的分析表明，机体内部的应力及应变正常、均匀平顺，机体裂纹的原因并非机体的结构不合理造成的．更多还原

【Abstract】 The shell and beam constructing model and part stress model for finite element analysis of a V-type cylinder block are set up, the boundary condition of calculation is determined, the finite element model is corrected through the cylinder blocrk dynamic test. The nature frequency,normal mode shape,stress and strain of cylinder block are calculated. Through the analysis of the calculated result,it is concluded that the stress and strain are normal, well distributed and smooth-going, the reason of crack trouble is not the defact of cylinder block structure.更多还原