共查询到20条相似文献,搜索用时 122 毫秒
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以汽车后桥上壳为实例,分析了反求工程中实物的测量方案,并利用三坐标测量机对实物进行测量,对测试数据进行处理,在UG软件中进行实物的建模。 相似文献
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Imageware在摩托车覆盖件反求工程中的应用 总被引:3,自引:0,他引:3
介绍了反求工程的含义及工作流程,阐述了摩托车覆盖件的三维点云数据采集,讨论了利用反求工程软件Imageware对摩托车覆盖件点云数据处理并进行曲面重构的过程。 相似文献
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反求工程在曲面工件超声无损检测中的应用研究 总被引:1,自引:0,他引:1
阐述了反求工程在曲面工件超声波检测中的重要作用 ,并对曲面工件超声波检测中反求工程的特点和关键技术进行分析和研究 ,在此基础上提出了面向实物的超声波测量、曲面重建、超声波无损检测一体化方案 ,为实现曲面工件的快速无损检测开辟了新的途径 相似文献
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在反求工程CAD建模技术的基础上,介绍了一种从实物样件获取产品实体模型的测量造型技术.以实际工业产品为设计对象,运用该技术快速、准确地建立了产品的实体模型.应用结果表明,该技术实用、有效,生成曲面模型光滑、连续、几何信息完整,在数控加工、反求工程及并行工程中有着广阔的应用前景. 相似文献
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反求工程技术在机械产品设计中的应用 总被引:6,自引:1,他引:6
对机械产品的反求过程进行了系统分析,对反求三维测量、利用反求软件进行曲面重构、及三维造型等反求工程中的关键技术阶段进行了详细的探讨。 相似文献
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三坐标测量机在逆向工程的应用 总被引:1,自引:1,他引:1
以对减速器箱体进行三维模型重构为例,介绍了WENZEL三坐标测量机在规则零件逆向工程中的应用.用三坐标测量机提取鼠标的表面数据,然后导入Pro/E软件进行模型重建,介绍了三坐标测量机在自由曲面逆向工程中的应用.把重建的曲面模型导入三坐标测量机的应用软件,通过测量实物与模型相比较,评定了重建后模型的精度. 相似文献
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反求技术在搅拌机拌筒叶片三维建模中的应用 总被引:1,自引:0,他引:1
通过反求技术在搅拌机拌筒叶片上的应用,探讨了原形的数字化技术和叶片原形CAD模型的重建技术,解决了 叶片反求过程中的测量技术及曲面构造技术等关键难点技术。 相似文献
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Dr Alan C. Lin Chao-Fan Chen 《The International Journal of Advanced Manufacturing Technology》1998,14(11):824-834
This research aims to establish a methodology for error analysis, providing a norm to analyse the margin of error between a prototype and its final product during reverse engineering. It is anticipated that the information derived from such an error analysis is advantageous either for refinement of the product or for modification of a later CAD model.In error analysis, the priority is to establish a universal comparison-standard for the prototype and the final product. In other words, this research calls for a coordinate transformation matrix which transforms the coordinate of measured point-data of a prototype to another coordinate system consistent with that of the final product. The main issues in this research include:
In addition to fundamental theory and algorithmic discussion, this research proves the viability of the proposed methodology by examples. 相似文献
1. | Process point-data beforehand and construct a B-spline surface based on these data. |
2. | Regard statistics as a reference to determine the number of exam-points required for error analysis. |
3. | Use a simplex method along with a least-squares method to acquire three translation and three rotation parameters for coordinate transformation. |
4. | Conduct error analysis and display margins of error. |
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NURBS curve and surface fitting for reverse engineering 总被引:13,自引:4,他引:13
Dr W. Ma J. -P. Kruth 《The International Journal of Advanced Manufacturing Technology》1998,14(12):918-927
Reverse engineering is an approach for constructing a computer-aided design (CAD) model from a physical part through dimensional measurement and surface modelling. This paper presents alternatives for reverse engineering of free-form parts using Non-Uniform Rational B-Spline (NURBS) surfaces. A two-step linear approach is employed for fitting NURBS curves and surfaces using the measured points. During the first step, the weights of the control points are identified from a homogeneous system using symmetric eigenvalue decomposition. The control points are further processed in a way similar to B-spline curve and surface fitting. Some examples are presented to illustrate both the steps of reverse engineering and the process of NURBS curve and surface fitting. 相似文献
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