A novel geometric model reconstruction method of the surrounding environment with echoes

2014 ◽  
Author(s):  
Chunhe Yu ◽  
Yuanyuan Yu
Keyword(s):  
Geometric Model ◽  
Reconstruction Method ◽  
Model Reconstruction ◽  
Surrounding Environment

350km/h EMUs Light Frame Model Reconstruction Technology

2013 ◽  
Vol 655-657 ◽  
pp. 292-295
Author(s):  
Bao Zhang Qu ◽  
Hui Peng ◽  
Wen Yi Wei
Keyword(s):  
Geometric Model ◽  
Original Data ◽  
Structural Features ◽  
Frame Structure ◽  
Reconstruction Method ◽  
Model Reconstruction ◽  
Engineering Technology ◽  
Analysis Technique ◽  
Multiple Unit ◽  
Intersection Curves

As the EMUs (Electrical Multiple Unit) light frame structure, combined of many complex surfaces, building its geometric model directly is a big challenge. Reverse Engineering Technology is adopted to make the light frame redesign. Considering the characteristics of the frame surface with big curvature changed, irregular contours of structural features and IGES based model, authors proposed the model reconstruction method, by using independent geometric module in Pro/E. Firstly, establish base planes from IGES file, then duplicate light frame surface from IGES file to generate a set of intersection curves with the base planes and surface duplicated above as mixed guide curves. After that, curvature analysis technique is presented for intersection curves precision check. And finally, the 3D model is reconstructed by boundary blend technology. The original data imported can be removed from this model in order to support parts redesign as well as their manufacturability analysis. Research outcomes above offer an efficient innovation solution for surface reconstruction with curvature changed dramatically and IGES based model as well.

A Model Reconstruction Method of Blade Repair Based on Linear Combination

2021 ◽  
Vol 22 (3) ◽  
pp. 383-394
Author(s):  
Baohai Wu ◽  
Hai Zheng ◽  
Ying Zhang ◽  
Ming Luo ◽  
Dinghua Zhang
Keyword(s):  
Linear Combination ◽  
Reconstruction Method ◽  
Model Reconstruction ◽  
Blade Repair

scholarly journals A Method for Tooth Model Reconstruction Based on Integration of Multimodal Images

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Xinwen Zhou ◽  
Yangzhou Gan ◽  
Jing Xiong ◽  
Dongxia Zhang ◽  
Qunfei Zhao ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Orthodontic Treatment ◽  
Ct Images ◽  
Ct Scans ◽  
Reconstruction Method ◽  
Model Reconstruction ◽  
Crown Area ◽  
Computer Aided ◽  
Multimodal Images ◽  
Reconstructed Model

A complete digital tooth model is needed for computer-aided orthodontic treatment. However, current methods mainly use computed tomography (CT) images to reconstruct the tooth model which may require multiple CT scans during orthodontic progress, and the reconstructed model is also inaccurate in crown area. This study developed a tooth model reconstruction method based on integration of CT images and laser scan images to overcome these disadvantages. In the method, crown models and complete tooth models are first reconstructed, respectively, from laser scan images and CT images. Then, crown models from laser scan images and tooth models from CT images are registered. Finally, the crown from laser scan images and root from CT images were fused to obtain a new tooth model. Experimental results verified that the developed method is effective to generate the complete tooth model by integrating CT images and laser scan images. Using the proposed method, the reconstructed models provide more accurate crown than CT images, and it is feasible to obtain complete tooth models at any stage of orthodontic treatment by using one CT scan at the pretreatment stage and one laser scan at that stage to avoid multiple CT scans.

Automatic CAD Model Reconstruction from Multiple Point Clouds for Reverse Engineering

2002 ◽  
Vol 2 (3) ◽  
pp. 160-170 ◽  
Author(s):  
Jianbing Huang ◽  
Chia-Hsiang Menq
Keyword(s):  
Reverse Engineering ◽  
Boundary Surface ◽  
Point Clouds ◽  
Geometric Feature ◽  
Multiple Point ◽  
Reconstruction Method ◽  
Cad Model ◽  
Model Reconstruction ◽  
Triangle Mesh ◽  
Novel Technologies

In this paper, a systematic scheme is proposed and novel technologies are developed to automatically reconstruct a CAD model from a set of point clouds scanned from the boundary surface of an existing object. The proposed scheme is composed of three major steps. In the first step, multiple input point clouds are incrementally integrated into a watertight triangle mesh to recover the object shape. In the second step, mesh segmentation is applied to the triangle mesh to extract individual geometric feature surfaces. Finally, the manifold topology describing the connectivity information between different geometric surfaces is automatically extracted and the mathematical description of each geometric feature is computed. The computed topology and geometry information represented in ACIS modeling kernel form a CAD model that may be used for various downstream applications. Compared with prior work, the proposed approach has the unique advantage that the processes of recognizing geometric features and of reconstructing CAD models are fully automated. Integrated with state of the art scanning devices, the developed model reconstruction method can be used to support reverse engineering of high precision mechanical components. It has potential applications to many engineering problems with a major impact on rapid design and prototyping, shape analysis, and virtual reality.

Towards a Building Techniques of a BREP Model Starting From a Meshed Surface

2021 ◽  
Author(s):  
Nessrine Elloumi ◽  
Aicha Ben Makhlouf ◽  
Borhen Louhichi ◽  
Dominique Deneux
Keyword(s):  
Computer Aided Design ◽  
Geometric Model ◽  
Reconstruction Algorithm ◽  
Original Method ◽  
Main Step ◽  
Cad Model ◽  
3D Animation ◽  
Model Reconstruction ◽  
3D Data ◽  
Visualization And Simulation

Abstract For several years, research has been brought to reconstruct a Computer Aided Design (CAD) model from a 3D mesh or point cloud produced by scanning techniques or CAD software. This process, which recreates the geometry of a real part is called Revere Engineering (RE). In the industry, RE enables designers and engineers to virtually simulate, test and validate products before the manufacturing process. Therefore, it is common to use a reconstruction algorithm to rebuild a CAD model of a real object with high quality. This technique solves several problems of exchanging geometric models in engineering, computer vision, computer graphics, 3D animation, medical, mechanic, virtual/ augmented reality, etc. Therefore, CAD model reconstruction promotes the integration of 3D data without recopying or manual transformations and facilitates the visualization and simulation of the deformed model behavior. The aim of this work is how to rebuild a CAD model starting from a deformed mesh. The complexity of this problem requires to be split into several complementary parts. 3D surface reconstruction is considered as the most difficult step to obtain this geometric model. This paper consists in presenting an original method to reconstruct a CAD model surface (NURBS surface) starting from a triangulation (meshed surface) as a main step of the geometric model reconstruction.

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