共查询到17条相似文献,搜索用时 187 毫秒
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目的 将基于3D草图的曲面重建方法应用于个性化鞋楦设计。方法 对个性化鞋楦设计方法进行研究,确定足楦设计标准,使用基于3D草图的逆向设计方法,在脚部模型上创建包含足型关键参数的鞋楦3D草图。根据3D草图选择合适的曲面创建工具生成鞋楦CAD模型。通过修改鞋楦3D草图,实现鞋楦模型的变形设计。结论 以Geomagic Design X为设计平台,根据足楦设计标准,实现了基于足部扫描模型的鞋楦3D草图提取和CAD模型创建。修改鞋楦3D草图中头势曲线,在草图约束驱动下得到新款式3D草图,创建了新鞋楦模型,实现了个性化鞋楦的创建和再设计。 相似文献
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非接触式激光测量点云数据预处理 总被引:1,自引:0,他引:1
作为逆向工程中形状表面数字化应用最广泛的方式,非接触式激光测量具有接触式测量无可比拟的优势。然而激光测量所得的数据点云存在明显缺陷无法直接应用于三维模型重建。本文重点讨论了激光测量所得点云数据的特点,并针对其缺陷提出一些处理方法进行改善,使之可以直接应用于三维模型的重建。 相似文献
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本文介绍了逆向工程理论,建立了一个基于激光三维测量的集成逆向工程(Integrated Reverse Engineering,IRE)系统模型,并对其关键技术进行了深入研究。该系统首先利用先进激光测量方法对实物进行三维数字化处理,借助专用的曲面重构软件及CAD系统反求出实物的CAD模型,然后再按照传统的制造流程生产出产品或原型。 相似文献
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以少数民族文化遗产的保护和开发方法研究为目的,从实物测量、三维CAD模型、曲面模型评价体系、CAD模型重建等方面详细阐述了逆向工程技术在文化遗产保护方面的应用.选用有代表性的贵州少数民族文物--布依族酒壶、水壶以及木制傩戏面具作为研究对象,采用Hiscanner 激光扫描测头对其进行数据采集,扫描得到的点云数据可刻录到光盘上作为文物数据永久保存;更进一步地,采用目前流行的逆向工程软件Geomagic studio对点云数据进行数据精简、数据滤波、数据修补、提取特征线等处理后得到NURBS曲面;为保证曲面模型重建的精度,在曲面重建模型后对其误差评价,通过控制误差的方式指导曲面模型重建,使重建的文物曲面模型能真实完整地反映原状;最后,在功能强大的三维造型软件Solidworks中导入重构的NURBS曲面进行曲面缝合、放样等,将其生成实体CAD模型,并对模型的局部特征进行适当的再设计以实现文物实体模型的优化.对该模型进行快速成型制造可得到文物复制品或成品模具,即实现逆向工程技术在文化遗产保护中的应用研究.逆向工程技术应用于少数民族文化遗产文物保护是一个全新的课题,该项技术的应用能进一步推动文化遗产保护措施的发展,也能为类似课题的研究提供借鉴. 相似文献
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提出了一种在三角网格鞋楦模型上生成三维帮样曲线的离散表示及其交互编辑修改方法。基于改进的能量模型对鞋楦曲面的选择区域进行展平,利用展平过程建立的三维帮面与展平后二维帮面间的拓扑对应关系,实现鞋样曲线在三维空间与二维展平空间的实时关联;所生成的二维帮样曲线以3次非均匀B-spline表示,并以DXF格式输出,便于其他程序调用。算例结果显示,本文方法具有交互性好、实时直观的优点,能够满足基于楦型的帮样交互设计要求。 相似文献
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By the increasing development in applications of engineering plastics, demand for rapid and reliable welding methods has been increased. One of these joining methods of engineering thermoplastics is friction stir welding (FSW) which is based on frictional heat generated through contact between a rotating tool and the workpiece. In this paper, acrylonitrile butadiene styrene (ABS) sheets were joined using a fixed heated shoe called “hot shoe” while a rotating pin through this shoe stirs melted material. Rotational speed of the pin, traveling speed and shoe temperature at the beginning of the welding procedure were considered as varying parameters. In order to study their effects on the mechanical properties of welded parts, a 33 full factorial design of experiment was used. Welds tensile strength was considered as the mechanical property of welded samples. Obtained results show a significant relationship between considered properties and processing parameters through an analysis of variance (ANOVA) study and the response surface method (RSM). 相似文献
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The reverse engineering approach is being widely applied in designing and manufacturing of sculptured surfaces. The first step in the reverse engineering process is collection of data lying on the surface. When using a coordinate measuring machine (CMM) with a touch trigger probe for digitizing data points, the probe radius must be compensated according to normal vectors. Previous works were addressed on the iterative measurement procedure to reduce the error caused by the compensation. The major problem of iterative methods is time consumption in digitization. This paper proposes a new architecture based on look-up table that keeps the estimated normal vectors of the measurement data to refine the data points digitized by CMM. The digitized data are first fitted into several NURBS curves by interpolation. The skinning method is then applied to interpolate these curves. Thus a smooth NURBS surface can be constructed and more accurate normal vectors of the measurement points can be obtained to compensate for the probe radius. By using this software iterative technique, we need only one digitization procedure. Therefore, much time can be saved and the efficiency of reverse engineering can be improved. 相似文献