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Verification of scanned engineering parts with CAD models based on discrete curvature estimation

Verification of scanned engineering parts with CAD models ba...

引用

作者： Lipshitz, B. Fischer, A. Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion-Israel Institute of Technology Haifa Israel

The manufacturing industry constantly needs to verify machined objects against their original CAD models. Given a prototype design, an engineer should be able to determine whether the part was manufactured well;that is, whether it fits the CAD model exactly. However, derivative computations are unstable for real data, and the estimated curvature is thus very sensitive to noise. Moreover, in many cases, spatial fitting of corresponding points is not sufficient. The current work utilizes the curvature properties to inspect manufactured parts that have been reconstructed from noisy and densely sampled data. Copyright © 2005 by ASME.

关键词： computer aided design

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Ontology-Driven Analytics for Indoor Point Clouds 25

Ontology-Driven Analytics for Indoor Point Clouds

引用

25th International Conference on computer-Aided Architectural Design Research in Asia, CAADRIA 2020

作者： Stojanovic, Vladeta Hagedorn, Benjamin Trapp, Matthias Döllner, Jürgen Faculty of Digital Engineering Hasso Plattner Institute University of Potsdam Computer Graphics Systems Group Germany

ISBN: (纸本)9789887891741

Automated processing, semantic enrichment and visual analytics methods for point clouds are often use-case specific for a given domain (e.g, for Facility Management (FM) applications). Currently, this means that applicable processing techniques, semantics and visual analytics methods need to be selected, generated or implemented by human domain experts, which is an error-prone, subjective and non-interoperable process. An ontology-driven analytics approach can be used to solve this problem by creating and maintaining a Knowledge Base, and utilizing an ontology for automatically suggesting optimal selection of processing and analytics techniques for point clouds. We present an approach of an ontology-driven analytics concept and system design, which supports smart representation, exploration, and processing of indoor point clouds. We present and provide an overview of high-level concept and architecture for such a system, along with related key technologies and approaches based on previously published case studies. We also describe key requirements for system components, and discuss the feasibility of their implementation within a Service-Oriented Architecture (SOA). © 2020 and published by the Association for computer-Aided Architectural Design Research in Asia (CAADRIA), Hong Kong.

关键词： Ontology

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Three dimensional adjustable cavity for flexible singulation of multiple medications in an automated medication dispenser

Three dimensional adjustable cavity for flexible singulation...

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2012 IEEE International Conference on Automation Science and engineering: Green Automation Toward a Sustainable Society, CASE 2012

作者： Toh, C.K. Ng, S.L.J. Tan, Y.O. Human Factors Engineering Programme Computer Graphics and Interface Department Institute of Infocomm Research Singapore Singapore

ISBN: (纸本)9781467304283

In the development of an effective medication management system to improve medication adherence, the challenge of flexibly dispensing of medications of multiple sizes and shapes was encountered. It is found that most of the medication dispensers in the market, as well as the feeding and orienting mechanisms in manufacturing sector, are customized to be operated with objects of specific size. In view of the inflexibility of those mechanisms, we proposed a novel method to handle and singulate medications of different sizes and shapes. A three dimensional adjustable cavity is designed as a carrier to separate and dispense one pill at a time. Rotational reciprocating vibration is then designed to provide centrifugal effect to the objects in hopper, in order to assist the singulation. An angle inclination test has been performed on the prototype built to investigate the optimum inclination of the feeding hopper. Preliminary testing has shown propitious results for dispensing round shape tablets of various sizes. The prototype built validated the concept of three dimensional adjustable cavity as a novel singulation technique. The mechanism is not only restricted to the dispensing of various sizes of pills, but has the potential to be implemented in dispensing or feeding of other objects in applications like vending machine, manufacturing system and etc. © 2012 IEEE.

关键词： Dispensers

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Real-time droplet modeling using color-space environment matting 09

Real-time droplet modeling using color-space environment mat...

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SIGGRAPH 2009: Posters, SIGGRAPH '09

作者： Choudhury, Biswarup Hao, Pisith Chandran, Sharat Vision Graphics and Imaging Laboratory Department of Computer Science and Engineering Indian Institute of Technology Bombay India

ISBN: (纸本)9781450379281

Amongst all atmospheric phenomena, rain is probably the most commonly used effect to create realistic immersive virtual environments, and to set the mood in movie storytelling. Although not immediately obvious, the beauty of rain emanates from the interplay of the involved light-matter interaction, generating effects of refraction and reflection, coupled with scattering effects. At the core, rain consists of water droplets under the influence of gravity. Current state of the art methods of generating rain are either computationally burdening, or not realistic enough. The key idea we introduce in this paper is to consider these droplets as transparent objects in the environment matting (EM) framework. This enables careful preprocessing to discover the light transport phenomena. We end up with a free-viewpoint real-time technique of simulating realistic droplets and rain in novel environments.

关键词： Rain

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Battlefield visualization and intelligent agents decision support 15

Battlefield visualization and intelligent agents decision su...

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15th Brazilian Symposium on computer graphics and Image Processing

作者： Mello, F Strauss, E Oliveira, A Institute of Research and Development-IPD Brazil Department of Electronics and Computer Engineering -DEL-POLI-UFRJ Brazil Computer Graphics Laboratory-LCG-COPPE-UFRJ Brazil

ISBN: (纸本)076951846X

This paper describes a decision support system for military operations based on intelligent agents dedicated to the planning and shaping activities. The system has a 3D visualization toolkit for the modeling of the war virtual scenario, which is represented by a 3D mesh using a height map of the actual battle space. The intelligent agents approach is used to support the commanders' decisions in conformity with a known combat doctrine. Each troop is designed as an agent, where its actions are described as a set of prefixed action-rules.

关键词： Decision support systems

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Adaptive reconstruction of freeform objects with 3D SOM neural network grids

Adaptive reconstruction of freeform objects with 3D SOM neur...

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作者： Barhak, J. Fischer, A. CMSR Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion-Israel Institute of Technology Haifa Israel

There are several open problems that are viewed as a bottleneck in the reverse engineering process: (1) The topology is unknown;therefore, point connectivity relations are undefined. (2) The fitted surface must satisfy global and local shape preservation criteria, which are undefined explicitly. The reconstruction is based on parameterization and fitting stages. However, the above problems are influenced mainly by the parameterization. To overcome the above problems, the neural network self-organizing map (SOM) method is proposed for creating a 3D parametric grid. The main advantage of the SOM method is that it detects the orientation of the grid and the position of the sub-boundaries. Then through an adaptive process the neural network grid is converged to the sampled shape. The SOM method is applied directly on a 3D grid and avoids projection anomalies, which are common to other methods. For the surface fitting stage the random surface error correction fitting method, which is based on the SOM method, was developed and implemented. © 2002 Elsevier Science Ltd. All rights reserved.

关键词： Reverse engineering

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Planar parameterization for closed 2-manifold genus-1 meshes

Planar parameterization for closed 2-manifold genus-1 meshes

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Ninth ACM Symposium on Solid Modeling and Applications, SM'04

作者： Steiner, D. Fischer, A. Laboratory for Computer Graphics and CAD Faculty of Mechanical Engineering Technion - Israel Institute of Technology Haifa 32000 Israel

Parameterization of 3D meshes is important for many graphics and CAD applications, in particular for texture mapping, re-meshing and morphing. Current parameterization methods for closed manifold genus-n meshes usually involve cutting the mesh according to the object generators, fixing the resulting boundary and then applying the 2D position for each of the mesh vertices on a plane, such that the flattened triangles are not too distorted and do not overlap. Unfortunately, fixing the boundary distorts the resulting parameterization, especially near the boundary. A special case is that of closed manifold genus-1 meshes that have two generators. They can therefore be flattened naturally to a plane without the use of a fixed boundary while still maintaining the continuity of the parameterization. Therefore, in treating genus-1 objects, this attribute must be exploited. This paper introduces a generalized method for planar parameterization of closed manifold genus-1 meshes. As in any planar parameterization with a fixed boundary, weights are assigned over the mesh edges. The type of weights defined depends on the type of mesh characteristics to be preserved. The paper proves that the method satisfies the non-overlapping requirement for any type of positive barycentric weights, including nonsymmetrical weights. Moreover, convergence is guaranteed according to the Gauss-Seidel method. The proposed method is simple to implement, fast and robust. The feasibility of the method will be demonstrated on several complex objects.

关键词： computer aided design

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Comparison of 3-d display formats for CAD applications 2

Comparison of 3-d display formats for CAD applications

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Stereoscopic Displays and Applications II 1991

作者： McWhorter, S.W. Hodges, L.F. Rodriguez, W.E. College of Computing/Engineering Computer Graphics Georgia Institute of Technology AtlantaGA30332-0280 United States

Two experiments were performed to rank different types of display formats common to CAD applications in terms of geometric information conveyed and perceived realism of objects. Display types tested were: wireframe, wireframe with hidden lines removed (HLR), shaded solid, orthogonal multi-view, stereoscopic wireframe, stereoscopic HLR, and stereoscopic shaded solid. The results of the geometric information experiment indicated that the orthogonal multi-view display was judged inferior to both the non-stereo and stereo pictorial displays and that the stereo displays were judged superior to the non-stereo displays in providing geometric information to the subject. Individual preferences among subjects, however, varied widely. The results of the realism experiment indicated that the flat shaded stereo, HLR stereo, and the flat shaded display types were judged to be equivalent and most realistic. The wireframe stereo, HLR, and wireframe displays were judged to be equivalent and less realistic. The orthogonal views display was judged to be the least realistic. © 1991 SPIE. All rights reserved.

关键词： Geometry

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Two-stage algorithm for rapid determination of the bending sequence in sheet metal products

Two-stage algorithm for rapid determination of the bending s...

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ASME 1996 Design engineering Technical Conferences and computers in engineering Conference, DETC-CIE 1996

作者： Radin, B. Shpitalni, M. Hartman, I. Laboratory for Computer Graphics and Cad Faculty of Mechanical Engineering Technion - Israel Institute of Technology Haifa32000 Israel

ISBN: (纸本)9780791897591

This paper presents an algorithm for solving the complex and critical problem of bending sequence in sheet metal manufacturing. Finding the bending sequence and required tool assignment presents a large combinatorial problem which is impossible to solve optimally for practical applications within a reasonable period of time. The paper presents a two-stage algorithm. The first stage finds a feasible solution based upon collision avoidance heuristics. The second stage rapidly seeks an alternative feasible sequence with a lower cost without exceeding time limitations. The algorithm is very practical because it reaches a low-cost solution quickly within computer memory limitations. In this paper, the problem is defined, the approach is presented formally, and finally, the power of the algorithm is demonstrated by solving bending sequences for real products. © 1996 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Sheet metal

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Contract Search: Heuristic Search under Node Expansion Constraints 2nd

Contract Search: Heuristic Search under Node Expansion Const...

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19th European Conference on Artificial Intelligence (ECAI)/6th Conference on Prestigious Applications of Intelligent Systems (PAIS)

作者： Aine, Sandip Chakrabarti, P. P. Kumar, Rajeev Mentor Graphics Pvt. Ltd. United States Department of Computer Science and Engineering Indian Institute of Technology Kharagpur India

ISBN: (纸本)9781607506058

In this work, we present a heuristic search technique (Contract Search) which can be automatically adapted for a specified node expansion limitation. We analyze the node expansion properties of best first search and propose a probabilistic model (rank profile) to characterize heuristic search under restricted expansions. We identify the basic properties of the rank profile and establish its relation with the search space configuration. In Contract Search, we use the rank profile model to formulate an optimal strategy to choose level dependent restriction bounds maximizing the probability of obtaining the goal node under the specified contract. Experimental comparison with anytime search techniques like ARA* and beam search shows that Contract Search outperforms these techniques over a range of constraint specifications.

关键词： Expansion

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