【作者】 王和平；

【导师】 苏铁熊； 张保成；

【作者基本信息】 华北工学院 ， 动力机械及工程， 2002， 硕士

【摘要】 曲轴是发动机中结构复杂、工作环境和工作条件恶劣的部件之一，它承受着很大的周期性交变载荷，是发动机设计的难点。因此在曲轴的设计中必须对其进行详细的受力分析、结构强度评估和疲劳寿命预测，以保证其能够安全可靠地工作。 本文针对上述问题，应用有限元技术对曲轴在进行静态分析的基础上进行了动态刚度、强度方面的研究和分析，并进行了疲劳寿命预测。 曲轴在周期性变化的气体压力、往复和旋转运动引起的惯性力以及它们的扭、弯矩共同作用下，既扭转又弯曲，因此静态分析考查了在最大爆发压力和拉力下曲轴的应力和变形，找出了应力和变形最大，最容易发生破坏的地方 但对于日趋严酷的设计指标，静态设计很难满足要求，必须对曲轴进行动态刚、强度的分析，因此对曲轴进行了实验模态分析和有限元模态分析，并用实验结果对有限元结果进行了修改和验证。在正确可信的有限元模型基础上，本文进行了动力响应分析，并在一定条件下进行了优化设计和动力修改，完成了动态设计的整个环节。 利用静态分析的结果分析了曲轴的疲劳性质，并校核了曲轴的强度，预测了曲轴的疲劳寿命。 为了实际生产需要，通过CAD系统设计出来的零件需要最终绘制出二维工程图纸。本课题应用Ⅰ-DEAS对曲轴进行了二维工程布图。更多还原

【Abstract】 The crankshaft works on the complicated and badly conditions, endured the great mechanical and heat burthen. It is difficult to design .in order to ensure its safety when in running, we must analyze and work out its distortion and stress.In order to solve the problem mentioned above, this paper analyses the crankshaft stress and distortion on the static burden by the finite element method. On the base of static analysis, This paper researches its structure intensity on dynamic burden.Under the variable gas pressure and inertial force which is arose by the rotary movement, the crankshaft is twisted and distorted. In this paper, the stress and distortion under the maximal explosive pressure are examined by the static finite element method. Finally the maximal stress and distortion are researched, so the part where is easily destroyed is found out.The static design can not satisfy the rigorous requirement of vibration, noise etc, so a dynamic stiff and strength analysis is used. In this paper, several main steps of dynamic design, such as model set up, test modal analysis and FE model analysis and dynamic modifying are discussed for the crankshaft.The fatigue strength is worked out on the basis of the static design. First, the fatigue character of the crankshaft is analyzed. Then, the fatigue life is worked out.In order to satisfy the project requirement, the solid model which is designed by the CAD system must be converted to two dimensions drawings. This paper converts the three dimension crankshaft to two dimension drawings by I-DEAS system.更多还原