【作者】 刘波；

【导师】 叶盛焱；

【作者基本信息】 武汉理工大学 ， 动力机械与工程， 2006， 硕士

【摘要】 有限元法随着计算机科学的发展,在包括汽车发动机在内的几乎所有工程领域得到了愈来愈广泛的运用。有限元技术的出现,为工程设计领域提供了一个强有力的计算工具。经过约半个世纪的发展,它已日趋成熟,在工程设计领域发挥着越来越重要的作用。汽车发动机零部件的设计是有限元技术最早的应用领域之一,有限元技术的应用提高了汽车发动机零部件设计的可靠性,缩短了设计周期,大大推动了汽车发动机工业的发展。曲轴是汽车发动机中最重要的部件,同时也是承受负荷最复杂的部件。其结构参数和加工工艺水平不仅影响着整机的尺寸和重量,也在很大程度上影响着发动机的可靠性与寿命。因而曲轴的强度研究是发动机设计必不可少的重要组成部分。 ANSYS是一个功能十分强大的、通用性很强的有限元分析软件,所以本文通过VC开发了基于ANSYS为核心的发动机曲轴有限元分析系统。 在对曲轴的种类和结构型式进行了分类总结后,提出了控制曲轴三维模型的尺寸,并在ANSYS中实现了曲轴的三维参数化建模。 在VC中设计了热计算和动力学计算模块,可以计算出任何曲轴转角下发动机连杆传递到连杆轴颈上的连杆力。并把计算结果和数据存入了数据库中,在其后的曲轴有限元分析时可以通过查询数据库,得到在任何曲轴转角所有连杆轴颈上作用的力。 通过比较曲轴静强度分析时不同加载方式和约束边界条件对结果的影响,得到了较好的边界条件,在此基础上实现了曲轴有限元分析的参数化控制。 本文建立了以ANSYS为计算核心的,用VC封装的发动机曲轴有限元分析系统。并通过此系统分析了495Q曲轴部分尺寸和结构型式对曲轴圆角应力的影响。 本文借助大型有限元分析软件ANSYS的二次开发语言APDL和VC++6.0的界面开发技术,研究开发参数化的曲轴有限元分析系统,实现了曲轴建模和分析计算的自动化、智能化,大大减小曲轴建模与分析的工作量,提高了新产品研发效率。更多还原

【Abstract】 Along with the development of the computer science the finite element analysis (FEA) was been widely applying in all engineering practice, also in the internal combustion engine (ICE) field. FEA became a powerful calculate implement as soon as its appearance. Now it plays an important part in all engineering design field after half century development. The automobile engine accessory design is one of the early fields that FEA was applied in. The application of the FEA improved on the reliability of the automobile engine accessory, shortened the design cycle, and greatly advanced the automobile engine industry development. The crankshaft is one of the most important part, and a part bearing most complicated load. Its structural dimensions and technics level not only affect the engine’ dimensions and weight, but also greatly affect the engine’s reliability and life. So it is very essential to study the intensity of the crankshaft in engine design process.ANSYS is a powerful and universal FEA software, but user must be proficient in the part which he will use, and has more knowledge of mechanics and FEA theory. So this thesis has done research about how to design simple FEA program for automobile engine crankshaft by VC and ANSYS.This thesis divides the crankshaft, finds about 40 dimensions of crankshaft model, and successfully creates the 3D model by parameter-control in ANSYS.The connecting rod force can be calculated by the thermal-calculate module and the dynamics-calculate module at any crankshaft rotate-angle in VC. These results are stored in a database, which will be queried in latter.This thesis acquired the better boundary condition by study differences between the analysis results when different loads and displacement constraints was applied. At the end the influence of the dimensions and structure to the crankshaft stress was been studied on 495 crankshaft.A high efficiency crankshaft FEA system is developed by utilizing VC and APDL which is a secondary development language of ANSYS in this thesis. It can create and analysis the crankshaft automatically and intelligently. So it can reduce the crankshaft design load and advance efficiency.更多还原