An Object-Oriented Formalism for Geometric Reasoning in Engineering Design and Manufacture

1993 ◽  
Author(s):  
Ravisrinivas Navaneethakrishnan ◽  
Kristin L. Wood ◽  
Richard H. Crawford
Keyword(s):  
Data Model ◽  
Mechanical Design ◽  
Object Oriented ◽  
Geometric Reasoning ◽  
Levels Of Abstraction ◽  
Modeling Technology ◽  
Design And Manufacturing ◽  
Form Features ◽  
Abstraction Levels ◽  
Design And Manufacture

Abstract Geometry is a language for representing and communicating mechanical design information. To enhance the integration of design and manufacturing tasks, a representation of product geometry at appropriate levels of abstraction for geometric reasoning is necessary. In addition, a mechanism to perform reasoning with the representation is needed. This paper describes a computational formalism for representing and manipulating geometry at different abstraction levels. Geometry is abstracted in terms of form features. Spatial relationships between features, which are important components for geometric reasoning, are represented using a modification of a previously developed technique — the intermediate geometry language (IGL). To enable geometric reasoning, information abstracted using features and the IGL is transformed into a data model based on object-oriented modeling technology. An object algebra is defined to query the data model for information.

Data Base Requirements for Concurrent Design Systems

1991 ◽  
Author(s):  
Ranko Vujosevic ◽  
Andrew Kusiak
Keyword(s):  
Data Base ◽  
Data Model ◽  
Object Oriented ◽  
Concurrent Design ◽  
Complex Objects ◽  
Maintenance System ◽  
Design And Manufacturing ◽  
Design Systems ◽  
Truth Maintenance ◽  
Definition Of

Abstract The data base requirements for concurrent design systems are discussed. An object-oriented data base, which allows for definition of complex objects, specification of relationships between objects, and modular expandability without affecting the existing information is defined. The data base is developed based on the object-oriented data model implemented in Smalltalk-80. An assumption-based truth maintenance system for maintaining the dependency relationships between design and manufacturing information is described.

A Unified Representation of Geometric Constraint Problems to Support Design and Manufacturing Applications

1998 ◽  
Author(s):  
Bernie Bettig ◽  
Jami Shah
Keyword(s):  
Mechanical Design ◽  
Geometric Constraint ◽  
Levels Of Abstraction ◽  
Support Design ◽  
Geometric Problems ◽  
Design And Manufacturing ◽  
Finite Set ◽  
Small Set ◽  
Manufacturing Applications ◽  
High Level

Abstract This research is based on the premise that a large number of problems in a variety of mechanical design and manufacturing domains can be mapped to a finite set of generic geometric problems. This paper presents only the representation aspects, which include not only the entities and their relationships at several levels of abstraction but also geometric tasks. To induce comprehensiveness we start at a very high level, listing many queries/commands arising in mechanical design and manufacturing and generalize these into a small set of generic queries/commands. In doing this we find it necessary to devise a new type of high level entity, the geometry characterization which is described with examples. To ensure tractability we start at a low level, describing primitive entities and constraints, and functions, and work our way up through compound entities and constraints. The end goal of this project is to produce an application independent system for geometric constraint solving and querying that can be integrated with any design or manufacturing application using a standardized representation.

The Application of Computer Techniques in the Design and Manufacturing of Timing Scrolls

1993 ◽  
Vol 207 (2) ◽  
pp. 99-108
Author(s):  
L Q Tang ◽  
D N Moreton
Keyword(s):  
Dynamic Characteristic ◽  
Computer Aided Design ◽  
Numerical Control ◽  
Feeding Mechanism ◽  
Control Techniques ◽  
Computer Aided ◽  
Design And Manufacturing ◽  
Manufacturing Techniques ◽  
Aided Design ◽  
Design And Manufacture

The timing scroll is an important feeding mechanism on packaging lines. As packaging line speeds have increased and the shape of containers has become more diverse, the techniques used for the design and manufacture of such timing scrolls have become critical for successful packaging line performance. Since 1980, various techniques have evolved to improve scroll design, manufacture and the associated line performance. In recent years, as CAD (computer aided design), CAM (computer aided manufacture) and CNC (computer numerical control) techniques have evolved, scroll design and manufacturing techniques began to be linked with computer techniques. In this paper, a scroll design and manufacturing package is presented which can be run on a minicomputer, such as a μ-VAX on an IBM PC clone. This scroll package can produce a timing scroll for any type of container with a correct pocket shape and good dynamic characteristic. Tests using carefully chosen containers have been made using this package and the results indicate that the scrolls obtained by this package have the correct pocket shape and good line performance. However, the design of a good pick-up geometry for some container shapes remains a problem.

ODM: An object oriented data model

1989 ◽  
Vol 7 (1) ◽  
pp. 3-35
Author(s):  
Mojtaba Mozaffari ◽  
Yuzuru Tanaka
Keyword(s):  
Data Model ◽  
Object Oriented

Study of the Spatio-Temporal Data Model in Sea Battlefield

2012 ◽  
Vol 246-247 ◽  
pp. 744-748
Author(s):  
Yue Lin Sun ◽  
Lei Bao ◽  
Yi Hang Peng
Keyword(s):  
Data Model ◽  
Object Oriented ◽  
Space Time ◽  
Comprehensive Analysis ◽  
Temporal Data ◽  
Data Types ◽  
Spatio Temporal ◽  
The Right ◽  
Effective Analysis

An effective analysis of the battlefield situation and spatio-temporal data model in a sea battlefield has great significance for the commander to perceive the battlefield situation and to make the right decisions. Based on the existing spatio-temporal data model, the present paper gives a comprehensive analysis of the characteristics of sea battlefield data, and chooses the object-oriented spatio-temporal data model to modify it; at the same time this paper introduces sea battlefield space-time algebra system to define various data types formally, which lays the foundation for the establishment of the sea battlefield spatio-temporal data model.

Integrated 3D Spatial Data Model of Object-Oriented Digital Landslide

2012 ◽  
Vol 204-208 ◽  
pp. 4872-4877
Author(s):  
Da Xi Ma ◽  
Xiao Hong Liu ◽  
Li Wei Ma
Keyword(s):  
Spatial Data ◽  
Data Model ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Data Modeling ◽  
Object Oriented ◽  
Landslide Modeling ◽  
Space Data ◽  
Spatial Data Model ◽  
Three Dimensional Space

By analyzing the attributes of three-dimensional space data model, the integrated 3D spatial data adopts object-oriented method for digital landslide modeling. It achieves spatial data modeling for landslide geological entity. An experimental case is given to indicate the feasibility of this approach for spatial data modeling.

Researches on the Object-Oriented Model of Distributed Image Database

2014 ◽  
Vol 543-547 ◽  
pp. 2184-2187
Author(s):  
Ping Zhang Gou ◽  
Yong Zhong Tang
Keyword(s):  
Comparative Analysis ◽  
Data Model ◽  
Object Oriented ◽  
Image Data ◽  
Image Database ◽  
Management Modes

Combined with the characteristics of the image data, this study contrasted four kinds of data model. Then it analyzed the three kinds of realization methods of image database, comparative analysis of management modes of the distributed image database finally.

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