离心泵叶轮CAD系统的开发

【作者】 关金生；

【导师】 沈萌红；

【作者基本信息】 浙江大学 ， 机械设计及理论， 2004， 硕士

【摘要】 离心泵叶轮是水泵的关键部件，它的设计速度和质量直接影响产品的开发周期和产品竞争力。本论文在详细了解国内外叶轮CAD应用的基础上，针对目前叶轮CAD的研究和应用现状的不足，采用参数化技术，在高档CAD软件平台Pro／ENGINEER上，开发了离心泵叶轮CAD系统。全文内容如下： 第一章介绍了CAD技术发展历史和现代CAD的技术特点，叶轮CAD软件应用和开发现状，指出了软件应用方面的不足，指出了本课题的意义。 第二章介绍了参数化技术的一些基础理论，目前应用比较广泛的变量几何法、几何推理法和基于构造过程法等三种参数化方法的理论原理。针对目前难以解决的叶轮参数化建模问题，在Pro／Engineer环境下，对叶轮参数化建模进行了研究，探讨了叶轮建模方面的关键技术。利用行为建模技术解决了单一参数化技术无法解决的轴面流道的优化问题，将叶轮设计的大量重复、费时费力的一个复杂设计过程，通过优化特征的建立，变成了一个自动化的过程。建立了叶轮的参数化模型，使模型具有直接参数驱动的能力。 第三章研究了叶轮的优化模型，对叶轮的优化和评价体系进行了研究。以能量损失最小为目标函数，以影响泵性能的主要部件叶轮的参数为设计变量对叶轮的模型进行优化。并对总效率η进行了推导，使模型更完整。以复合形法进行模型的优化设计，用优化结果驱动模型，实现模型的优化设计。 第四章，叶轮CAD原型系统实现，采用基于模型的方法，对模型进行开发。探讨了Pro／Engineer二次开发方面的关键技术，使模型具有直接的参数设计能力，模型优化功能，模型文件的管理并对模型的信息提取技术进行了开发。 第五章是全文的总结，介绍了本论文的研究成果，并指出了一些有待于进一步深入研究的问题。更多还原

【Abstract】 Centrifugal Pump impeller is the key component whose designing speed and quality directly influence the development period and the competition ability of production. The applications of impeller CAD at home and abroad and its deficiency are analyzed based on the detailed investigations. By adopting parameterized modeling technique on advanced CAD software plat Pro/E, the Centrifugal Pump impeller CAD system is developed. There are five chapters in this thesis:In the first chapter, the development, the characteristics and the current status of impeller CAD are introduced. The deficiency of the CAD software is analyzed. Finally the project significance, main research contents are provided.In the second chapter, firstly the basic theory of parameterized modeling technique and the three popular parameterized methods, namely variable geometric method, geometric logic and construction process method are introduced. The parameterized modeling impeller, which hasn’t been solved currently, is studied on Pro/E deeply and some key technologies of modeling the impeller are discussed. The Optimization of pinacoid flow passage, which can’t be realized by single parameterized technology, is figured out with behavioral modeling. By establishing the optimal characteristics, the complex and repetitive process of impeller design is turned into an automatic one. The built parameterized models have direct parameter-driven functions.In the third chapter, the optimized models, the optimizing and the evaluating system of impeller are studied. The minimal energy loss is regarded as the objective function and parameters of the impeller, the main component influencing the performance of pump, is treated as the design variables, so the optimization of the impeller models is done. The shortcomings of the primary models are analyzed and the total efficiency ? is calculated, which makes the models more perfective. Using complex method and the optimized results driving the models, the optimization design of models are realized.In the fourth chapter, the archetypal system of impeller CAD is realized. Based on model methods, the models are developed. The key technologies in the secondary development of Pro/Engineer are discussed, which make the models have the following functions, such as designing the parameters directly, optimizing models, managing model files. Furthermore the information extraction technology of models is developed.In Chapter five, all the research contents are summarized, and some advises are given for the future of the project research.更多还原