逆向工程在产品创新设计中的实践应用研究
发布时间：2019-05-15 04:45
【摘要】：随着生活水平的不断提高,仅仅重视功能要求的产品已经无法满足消费者了。市场需要产品不仅要有优良的性能还要有美观的外形。美观且丰富多样的产品造型必然会增加产品外形的复杂程度和加工难度,越复杂的外形越需要由多个自由曲面缝合而成,但是传统的加工方法受到了局限。为了顺应时代的变化,产品的创造性和经济性,利用逆向工程技术手段成了必然趋势。 在许多工业领域中,逆向工程技术采用3D扫描和3D打印技术相结合的方式来实现产品的快速制造。对已有的实物或油泥模型进行处理并用三维扫描设备完成测量,将模型表面测得的数据通过相应的逆向软件实现曲面重构,获得实物模型的3D数字模型,不断循环,直到符合标准的产品模型用于后续的计算机辅助分析和制造。 在扫描测量方面,本文介绍了扫描仪的类型和测量原理,着重分析了实验所用的手持式三维激光扫描仪设备。通过使用手持式扫描仪对实物模型的实际操作,本文探索出一种最优的扫描顺序,可以使系统在表面最优运算法方面发挥最好的效果,以便更好的获得准确的数据。 在运用逆向工程技术的过程中,会遇到因为点云数据量大而影响到曲面拟合的质量或者是和广泛运用的CAD软件兼容性的问题,所以本文深入研究了曲线、曲面基础理论和特性,总结了在不同情况下三角Bezier曲面拟合NURBS曲面拟合的区别以及NURBS方法的优点。利用专业的逆向软件来进行点云处理,以实例为代表,突出了专业逆向软件的优势,同时更好的应用了NURBS方法。本文总结出了最优的拟合方法,能够拟合出高质量的曲面,与下游CAD软件的工程应用实现了良好的兼容性。 逆向工程技术也在曲面重建中起着重要作用,它明显地降低了曲面重建的时间和模型相同部分的成本。在数据拼合、数据划分和模型重构中,为了要获得精确的实体数字模型,必须保证数据的精简和准确。在数据每一步操作过程中,数据的特征识别和提取,特别是轮廓线的提取,在曲面重建中起着十分关键的作用。本课题通过实例研究,得出结果：对特征和轮廓线实现精确的识别和提取,可以提高曲面重建后的精度,快速实现产品的创新设计。
[Abstract]:With the continuous improvement of living standards, only pay attention to functional requirements of the product has been unable to meet consumers. The market needs products not only to have excellent performance but also to have a beautiful appearance. Beautiful and rich and diverse product modeling will inevitably increase the complexity and processing difficulty of the product shape. The more complex the shape is, the more necessary it is to be stitched up by multiple free-form surfaces, but the traditional machining methods are limited. In order to adapt to the changes of the times and the creativity and economy of products, the use of reverse engineering technology has become an inevitable trend. In many industrial fields, reverse engineering technology uses 3D scanning and 3D printing technology to realize the rapid manufacturing of products. The existing physical or sludge models are processed and measured by three-dimensional scanning equipment. The data measured on the surface of the model are reconstructed by the corresponding reverse software, and the 3D digital model of the physical model is obtained, which is constantly circulating. Until the standard product model is used for subsequent computer-aided analysis and manufacturing. In the aspect of scanning and measuring, this paper introduces the type and measuring principle of scanner, and analyzes the handheld 3D laser scanner equipment used in the experiment. Through the practical operation of the physical model by using the handheld scanner, this paper explores an optimal scanning sequence, which can make the system play the best role in the surface optimal operation algorithm, so as to obtain the accurate data better. In the process of using reverse engineering technology, we will encounter the problem of affecting the quality of surface fitting or compatibility with widely used CAD software because of the large amount of point cloud data, so this paper deeply studies the basic theory and characteristics of curve and surface. The difference of fitting NURBS surface fitting with triangular Bezier surface under different conditions and the advantages of NURBS method are summarized. The point cloud processing is carried out by using the professional reverse software, represented by an example, which highlights the advantages of the professional reverse software and better applies the NURBS method. In this paper, the optimal fitting method is summarized, which can fit the high quality surface and achieve good compatibility with the engineering application of downstream CAD software. Reverse engineering also plays an important role in surface reconstruction, which obviously reduces the time of surface reconstruction and the cost of the same part of the model. In order to obtain accurate entity digital model, it is necessary to ensure the simplification and accuracy of data in data combination, data partition and model reconstruction. In each step of data operation, the feature recognition and extraction of data, especially the extraction of contours, play a very key role in surface reconstruction. Through the case study, the results show that the accurate recognition and extraction of features and contours can improve the accuracy of surface reconstruction and quickly realize the innovative design of products.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB472
本文编号：2477318
[Abstract]:With the continuous improvement of living standards, only pay attention to functional requirements of the product has been unable to meet consumers. The market needs products not only to have excellent performance but also to have a beautiful appearance. Beautiful and rich and diverse product modeling will inevitably increase the complexity and processing difficulty of the product shape. The more complex the shape is, the more necessary it is to be stitched up by multiple free-form surfaces, but the traditional machining methods are limited. In order to adapt to the changes of the times and the creativity and economy of products, the use of reverse engineering technology has become an inevitable trend. In many industrial fields, reverse engineering technology uses 3D scanning and 3D printing technology to realize the rapid manufacturing of products. The existing physical or sludge models are processed and measured by three-dimensional scanning equipment. The data measured on the surface of the model are reconstructed by the corresponding reverse software, and the 3D digital model of the physical model is obtained, which is constantly circulating. Until the standard product model is used for subsequent computer-aided analysis and manufacturing. In the aspect of scanning and measuring, this paper introduces the type and measuring principle of scanner, and analyzes the handheld 3D laser scanner equipment used in the experiment. Through the practical operation of the physical model by using the handheld scanner, this paper explores an optimal scanning sequence, which can make the system play the best role in the surface optimal operation algorithm, so as to obtain the accurate data better. In the process of using reverse engineering technology, we will encounter the problem of affecting the quality of surface fitting or compatibility with widely used CAD software because of the large amount of point cloud data, so this paper deeply studies the basic theory and characteristics of curve and surface. The difference of fitting NURBS surface fitting with triangular Bezier surface under different conditions and the advantages of NURBS method are summarized. The point cloud processing is carried out by using the professional reverse software, represented by an example, which highlights the advantages of the professional reverse software and better applies the NURBS method. In this paper, the optimal fitting method is summarized, which can fit the high quality surface and achieve good compatibility with the engineering application of downstream CAD software. Reverse engineering also plays an important role in surface reconstruction, which obviously reduces the time of surface reconstruction and the cost of the same part of the model. In order to obtain accurate entity digital model, it is necessary to ensure the simplification and accuracy of data in data combination, data partition and model reconstruction. In each step of data operation, the feature recognition and extraction of data, especially the extraction of contours, play a very key role in surface reconstruction. Through the case study, the results show that the accurate recognition and extraction of features and contours can improve the accuracy of surface reconstruction and quickly realize the innovative design of products.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB472
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