52 research outputs found
A feature-based reverse engineering system using artificial neural networks
Reverse Engineering (RE) is the process of reconstructing CAD models from
scanned data of a physical part acquired using 3D scanners. RE has attracted a
great deal of research interest over the last decade. However, a review of the
literature reveals that most research work have focused on creation of free form
surfaces from point cloud data. Representing geometry in terms of surface patches
is adequate to represent positional information, but can not capture any of the
higher level structure of the part. Reconstructing solid models is of importance
since the resulting solid models can be directly imported into commercial solid
modellers for various manufacturing activities such as process planning, integral
property computation, assembly analysis, and other applications.
This research discusses the novel methodology of extracting geometric features
directly from a data set of 3D scanned points, which utilises the concepts of
artificial neural networks (ANNs). In order to design and develop a generic
feature-based RE system for prismatic parts, the following five main tasks were
investigated. (1) point data processing algorithms; (2) edge detection strategies;
(3) a feature recogniser using ANNs; (4) a feature extraction module; (5) a CAD
model exchanger into other CAD/CAM systems via IGES.
A key feature of this research is the incorporation of ANN in feature recognition.
The use of ANN approach has enabled the development of a flexible feature-based
RE methodology that can be trained to deal with new features. ANNs
require parallel input patterns. In this research, four geometric attributes extracted
from a point set are input to the ANN module for feature recognition: chain codes,
convex/concave, circular/rectangular and open/closed attribute. Recognising each
feature requires the determination of these attributes. New and robust algorithms
are developed for determining these attributes for each of the features.
This feature-based approach currently focuses on solving the feature recognition
problem based on 2.5D shapes such as block pocket, step, slot, hole, and boss,
which are common and crucial in mechanical engineering products. This approach
is validated using a set of industrial components. The test results show that the
strategy for recognising features is reliable
Visual and Camera Sensors
This book includes 13 papers published in Special Issue ("Visual and Camera Sensors") of the journal Sensors. The goal of this Special Issue was to invite high-quality, state-of-the-art research papers dealing with challenging issues in visual and camera sensors
NASA Tech Briefs, August 1994
Topics covered include: Computer Hardware; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Computer Programs; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences; Life Sciences; Books and Reports
CIRP Encyclopedia of Production Engineering
This high quality reference work has been written and reviewed by members of The International Academy for Production Engineering, also known as CIRP. This Academy is recognized worldwide to represent the highest standards in research on production engineering, which includes design, optimization, control, management of processes, machines, and systems. One key concept behind this Encyclopedia is that apart from covering fundamental concepts in the field of production engineering, it also closely follows recent developments and emerging concepts. In particular this renewed print edition covers a wide range of new topical entries such as Hybrid Processes, High Performance Grinding, Biomimetic Design, Cold Spray, Sheet-bulk Metal Forming, Ecodesign, Cyber Physical System, Nano Technology, or Geometrical Product Specification. The second edition also comprises reviewed entries from the first version, which have been updated to reflect new standards or developments. The target audience primarily comprises researchers, engineers, managers, graduate students, and many others whose day-to-day work gravitates around production engineering technologies in the global market
Technology 2001: The Second National Technology Transfer Conference and Exposition, volume 1
Papers from the technical sessions of the Technology 2001 Conference and Exposition are presented. The technical sessions featured discussions of advanced manufacturing, artificial intelligence, biotechnology, computer graphics and simulation, communications, data and information management, electronics, electro-optics, environmental technology, life sciences, materials science, medical advances, robotics, software engineering, and test and measurement
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