Integrating cross-sectional imaging based reverse engineering with rapid prototyping

Liu, Zhenkai; Wang, Lihui; Lu, Bingheng

doi:10.1016/j.compind.2005.05.003

Cited by 24 publications

(11 citation statements)

References 20 publications

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“…solid model can convert to RP model [9,10] and VRML (Virtual Reality Modeling Language) format [11] for visualization. Liu, Wang, and Lu [12] proposed the algorithm for STL file generation from cross-sectional contours in three major steps: 1) pre-processing of cross-section images for data reduction, 2) Delaunay triangulation of contours in the first and last layers, and 3) triangulation of contours between adjacent layers, which divided into convex and non-convex contours.…”

Section: Introductionmentioning

confidence: 99%

STL mesh reconstruction for bio-medical rapid prototyping model

Wang

Hsiao

Chang

et al. 2007

2007 IEEE International Conference on Systems, Man and Cybernetics

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This paper presents the construction of 3D rapid prototyping (RP) physical models for computer tomography (CT) medical images. By using STL (Stereo Lithography) triangular meshes as basis for 3D construction, the process for RP model construction can be simplified via point data without turning them into curves. Grey prediction theory is used to sort out contour point data in each layer of the medical image. Using contour difference detection operation, the sequence is completed operation through the cross-sectional contours. The 3D solid model constructed via layer by layer meshes is to build the STL file. After saving as STL file, 3D solid model of the medical image is displayed with RP and its virtual reality presentation. Two case studies, human braincase and femur bone are used as case study for construction of 3D solid model with medical images. The method is successful and a number of steps are simplified. The two solid models are compared with curves swept-blend CAD models for analysis. The results show that differences between the two methods are in an acceptable range; therefore, it is shown that this method is feasible for reconstructing 3D models from CT medical images.

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Section: Introductionmentioning

confidence: 99%

STL mesh reconstruction for bio-medical rapid prototyping model

Wang

Hsiao

Chang

et al. 2007

2007 IEEE International Conference on Systems, Man and Cybernetics

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“…La reconstrucción con imágenes por medio de capas busca solucionar el problema de la captura de las características geométricas internas de una pieza, así como detalles externos que se pierden con el empleo de otras técnicas. Las imágenes pueden ser capturadas, por ejemplo, por medio de fotografía CCD (Charge Coupled Device), cortando la pieza en secciones sucesivas para poner éstas al descubierto, tal como en [14][15][16], realizando desbaste de la pieza como en [17,18], o empleando una técnica no destructiva para la captura de la imagen de la sección, tal como la tomografía computarizada (CT-Computed tomography) con rayos X [19,20] o mediante resonancia magnética.…”

Section: Introductionunclassified

“…Una vez obtenidas las imágenes de las diferentes secciones, las mismas deben ser procesadas con algoritmos de detección de contornos, los cuales permiten expresar matemáticamente, por ejemplo por medio de splines [14,19], los bordes de cada sección. Esta información puede ser empleada posteriormente por un software CAD para la construcción del sólido.…”

Section: Introductionunclassified

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Digitalización 3d Del Rodete De Un Compresor Centrífugo: Un Procedimiento Alternativo

Rojas

Duque-Daza

Urueña

et al. 2007

Ingeniare. Rev. chil. ing.

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RESUMENEn la digitalización 3D del rodete del compresor centrífugo de un turbo cargador HT3B, se evaluaron numerosas metodologías que permitieran reproducir su geometría satisfactoriamente, de modo que a partir del modelo virtual obtenido se pudiera llevar a cabo una simulación computacional de flujo en el compresor centrífugo. Tras analizar dichas metodologías se decidió que la toma de tomografías axiales computarizadas era la más indicada, a pesar de que requirió previamente la construcción de un modelo en acrílico del rodete. Una vez se contó con las tomografías axiales computarizadas del rodete, se procedió a construir el modelo virtual del mismo usando un programa CAD 3D, integrando una metodología analítica para la generación de la geometría de los álabes del rodete de un compresor centrífugo, con la información metrológica adquirida a través de las tomografías. El modelo virtual del rodete presentó características aptas para el posterior trabajo de simulación, demostrando que el procedimiento planteado constituye una alternativa viable para la digitalización 3D de piezas mecánicas de alta complejidad.Palabras clave: Compresores centrífugos, digitalización tridimensional, tomografía axial computarizada, ingeniería inversa. ABSTRACTIn the 3D digitizing of an HT3B turbocharger's centrifugal compressor's impeller, several methodologies were evaluated, reproducing its shape in such a way, that the obtained virtual model could be used to perform a computational flow simulation in the whole centrifugal compressor. After analyzing these methodologies, computerized axial tomographies were chosen as the most suitable methodology, despite requiring the previous construction of an impeller's acrylic-made model. Once the impeller's computerized axial tomographies had been taken, the generation of the virtual model was performed by software CAD 3D, by integrating an analytic methodology for the impeller's vanes' geometrical shape generation, with the metrological information extracted from the tomographies. The virtual model generated presented characteristics which made it appropriate for the intended flow simulation, showing that the procedure used for this purpose constitutes a feasible alternative for the 3D digitizing of complex mechanical parts.

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“…The obtained model is then fed into RP process. However because surface reconstruction consumes 90-95% of the RE processing time comparing to 5-10% of that for digitizing physical prototype [24], it is skipped in the second approach where an STL file is created directly from the point cloud [25]. Inherent errors from STL conversion process have inspired the third approach where commands are generated directly from the point cloud [4].…”

Section: Rapid Prototyping and Its Interfacing With Sketch-based Modementioning

confidence: 99%

Supporting Rapid Product Development with Sketch-Based Modeling

Chansri¹,

Koomsap²

2013

IFIP Advances in Information and Communication Technology

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Abstract. Nowaday, rapid product development (RPD) becomes a crucial approach for the success of a company in a competitive market when the complexity and diversity of products keep increasing while their lifetimes are getting shorter and shorter. Freehand sketch is a tool that is closer and more practical for customer to communicate his/her ideas to manufacturer. The sketch is typically transformed to be a 3D model for technologies such as rapid prototyping where a physical prototype is fabricated from a 3D model. Presented in this paper is a review of sketch-based modeling that allows customers-manufacturers to speed up the idea realization. Sketch-based modeling has been developed not only to transform a sketch to be a 3D model but also to interface with rapid prototyping.

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Integrating cross-sectional imaging based reverse engineering with rapid prototyping

Cited by 24 publications

References 20 publications

STL mesh reconstruction for bio-medical rapid prototyping model

STL mesh reconstruction for bio-medical rapid prototyping model

Digitalización 3d Del Rodete De Un Compresor Centrífugo: Un Procedimiento Alternativo

Supporting Rapid Product Development with Sketch-Based Modeling

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