【作者】 张瑞；

【导师】 李建华；

【作者基本信息】 西安科技大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 汽车转向助力泵是汽车动力转向系统的动力源,其中定子曲线又是关乎转向泵振动和噪声的关键因素。虽然经过了多年的研究,在某些方面取得了突破性进展,但对定子曲线在噪声控制的研究上与国外先进技术仍有较大差距。本文便是以陕西秦川机械发展股份有限公司生产的汽车转向助力泵为研究对象,结合反求工程技术,研究了转向泵定子的CAD模型重构的方法,并对重构模型进行了精度分析,为我国机械产品的创新设计提供了一个很好的参考模式。本文首先对反求工程技术作了总结性介绍,其中包括反求工程的概念、背景、意义、国内外的研究进展、优秀的反求造型软件等。在此基础上,着重分析研究了反求造型的关键技术,包括点云数据获取、数据预处理、曲面重构和曲面品质精度分析方法等,为后续的转向泵定子的CAD模型重建提供了理论和技术保障。对汽车转向助力泵定子的研究主要是针对定子的过渡曲线,其中分析并比较了等加速等减速曲线和高次曲线在控制噪声方面表现的优劣,重点分析了5次曲线的优异表现,为后续定子CAD模型重构时曲线拟合类型的选择奠定了基础。文中通过TDV-500三维激光扫描仪对转向泵定子进行三维点云数据的采集,利用优秀的反求造型软件Imageware对点云数据进去噪、平滑、精简、分割、曲面拟合等具体操作,较好的完成了对转向泵定子的CAD模型重构,并对重构模型进行了精度分析。再者,探讨了反求工程所得的CAD模型在建立之后的主要用途,并研究了反求工程在引入到产品改进设计之后所带来的积极影响。在文章的结束,作者给出了本课题的研究结论与展望。更多还原

【Abstract】 Automobile power steering pump (APSP) is the heart of the automobile power steering system. The stator curve is the most important factor which impact on the vibration and noise of the steering pump. Although we have been studying up on it for many years, and breaking through in many fields, there is a great disparity in the advanced technology of the controlling of noise between the home and abroad. In this paper, the author uses the technology of reverse engineering to reconstruct the stator CAD model by studying the APSP which produced by the Shaanxi Qinchuan Machinery Development Co., Ltd. At the same time the precision of the reverse result is analyzed in detail. This paper provides a new method to innovate and redesign the machinery production for our country.At first this paper introduces the reverse engineering summarily, including its conception, background, meaning, development, excellent RE software and so on. Then the author analyzes the key technologies of the reverse engineering, such as data acquirement, data pretreatment, 3D surface reconstruction and precision analysis. All of these provide a theoretical and technical support for the reconstruction of the stator CAD model.In the next part, the author studies on the stator transition curve of the automobile power steering pump, analyzes the constant acceleration and deceleration curve and the higher order curve, and introduces the 5 order curve in detail. By this way, it provides a theoretical support for the data fitting.In this research, the point cloud of the sample of the APSP was obtained by the 3D laser scanner. The point clouds are pretreated by Imageware and the 3D geometrical modeling is rebuilt by Imageware too. The precision analysis shows that the error was small enough to meet the request in engineering. It realized the expected goal basically in the system. And,how to use Reverse Engineering in improving design as creative tool is studied. At the end of the paper, the research conclusion and prospect are given by the author in the subject.更多还原