规范化的发动机主要零部件cad系统开发分析及应用-analysis and application of standardized cad system for main engine components.docxVIP

中北大学学位论文中北大学学位论文过程中特征选择的关联化，并为用户设置了默认选型；通过对软件系统的检测与维护，提高了软件系统的可靠性和稳定性。 最终的应用表明，本文开发的系统可以完成发动机机体、气缸盖、曲轴、连杆、齿轮和凸轮轴的设计，系统集成程度高、管理规范、开发速度高、可扩充性好、代码重用 率高、运行稳定、可靠，基本满足了预期设计目标。关键词：规范化设计，面向对象方法，生命周期法，发动机 CAD 系统The Development research and application of Standardized engine major parts CAD system AbstractAiming at the problem of Low degree of integration,lack of standardization management,slow development speed,poor scalability,low code reuse rate and so on,the thesis study the standardized modeling process for the major parts structures of the engine,including top-down,parts structuralization,structure characterization,feature parameterization and parameter correlation that based on the skeleton line,and using the modeling process create feature model library of the parts;Meanwhile, establish the child features thing characteristics tables and parameter hint pictures which are independent with any commercial CAD.On the basis of the standardized modeling,by means of the combination of the life cycle method and object-oriented software development methods in software engineering,according to the general development process for CAD software and then package the standardized design feature model library,child feature thing characteristics table and parameter hint pictures into the backend database of CAD system,combine with Pro/TOOLKIT of engineering software Pro/E and realize the man-machine interactive parametric design,at last develop a set of engine block,cylinder head,crankshaft,connecting rod,gear and camshaft key parts CAD design system.In accordance with the traditional design idea of the engine parts,the thesis study the specific contents of engine block,cylinder head,connecting rod,gear and camshaft during conceptual design,project design and detailed design phase,discuss the above components structure’s characterization decomposition method,on this basis create all the child parts’ three-dimensional templates model including engine block,cylinder head,connecting r