scholarly journals Interactive Geometric Modeling System based on Practical Engineering Drawings

1984 ◽  
Vol 27 (230) ◽  
pp. 1788-1795
Author(s):  
Tamio AIZAWA ◽  
Kohichi YAMATO ◽  
Masaru NAKAZAWA
Keyword(s):  
Geometric Modeling ◽  
Practical Engineering ◽  
Engineering Drawings ◽  
Geometric Modeling System

Design for Assembly Evaluation of Orientation Difficulty Features

1992 ◽  
Author(s):  
Robert H. Sturges ◽  
Jui-Te Yang
Keyword(s):  
Geometric Modeling ◽  
Boundary Representation ◽  
Design For Assembly ◽  
Assembly Process ◽  
Assembly Evaluation ◽  
Index Of Difficulty ◽  
Analysis System ◽  
Time Required ◽  
High Level ◽  
Geometric Modeling System

Abstract In support of the effort to bring downstream issues to the attention of the designer as parts take shape, an analysis system is being built to extract certain features relevant to the assembly process, such as the dimension, shape, and symmetry of an object. These features can be applied to a model during the downstream process to evaluate handling and assemblability. In this paper, we will focus on the acquisition phase of the assembly process and employ a Design for Assembly (DFA) evaluation to quantify factors in this process. The capabilities of a non-homogeneous, non-manifold boundary representation geometric modeling system are used with an Index of Difficulty (ID) that represents the dexterity and time required to assemble a product. A series of algorithms based on the high-level abstractions of loop and link are developed to extract features that are difficult to orient, which is one of the DFA criteria. Examples for testing the robustness of the algorithms are given. Problems related to nearly symmetric outlines are also discussed.

scholarly journals Hardware and Software Implementation of Constructive Geometric Models

2020 ◽  
pp. 83-98
Author(s):  
Denis Voloshinov ◽  
Konstantin Solomonov
Keyword(s):  
Computer Technology ◽  
Geometric Modeling ◽  
Software Implementation ◽  
Theoretical Research ◽  
Graphical Interface ◽  
Calculation Methods ◽  
Geometric Transformations ◽  
Geometric Models ◽  
Long Time ◽  
Geometric Modeling System

The article is devoted to the consideration of a number of issues of hardware and software implementation of constructive geometric models. A rich arsenal of theoretical research in the field of constructive geometry has not been properly used for a long time due to the lack of tools for translating such models using computer technology. The development and improvement of the Simplex geometric modeling system, in which any geometric design is considered as a converter of information represented by signals of a geometric nature, has opened the possibility of applying the achievements of geometric science in computing applications, as well as the development of hardware that implements geometric calculation methods and provides a new graphical interface. The concept developed by the authors is aimed at creating specialized accelerators of geometric transformations.

Towards Dynamic Tolerance Analysis Using Bond Graphs

1998 ◽  
Author(s):  
Otto W. Salomons ◽  
Johan Zijlstra ◽  
Johnny A. van der Zwaag ◽  
Fred J. A. M. van Houten
Keyword(s):  
Dynamic Behavior ◽  
Robust Design ◽  
Physical Modeling ◽  
Geometric Modeling ◽  
Tolerance Analysis ◽  
Simulation System ◽  
Computer Support ◽  
Bond Graphs ◽  
Physical Effects ◽  
Geometric Modeling System

Abstract A generic method is proposed by which the effect of tolerances in combination with physical effects such as wear can be analysed on the dynamic behavior of mechanisms. The method uses bond graphs in order to simulate the dynamic behavior under the influence of tolerances and other physical effects. The method has the potential to offer enhanced computer support in tolerance value specification as well as in robust design and model based maintenance. The method has partly been implemented using a combination of a geometric modeling system (FROOM) and a bond graph based physical modeling and simulation system (20-Sim).

A Knowledge Based Geometric Modeling System for Preliminary Design Using Object-Oriented Approach

1989 ◽  
Author(s):  
S. Akagi ◽  
K. Fujita
Keyword(s):  
Geometric Modeling ◽  
Geometric Model ◽  
Object Oriented ◽  
Object Oriented Programming ◽  
Preliminary Design ◽  
Design Environment ◽  
Knowledge Based ◽  
Object Oriented Approach ◽  
Geometric Modeling System ◽  
Oriented Approach

Abstract A knowledge-based geometric modeling system for preliminary design was developed using object-oriented approach. Three types of knowledge for design, i.e. the model representing a design product including the geometric model, the procedures manipulating the design product and the knowledge managing the design process were integrated in the system. The model built up with object-oriented programming provides an effective and flexible design environment. Finally, the system was applied to the preliminary design of a ship’s hull arrangement to ascertain its validity and effectiveness.

A Geometric Modeling System for Automated Mechanical Assembly

1980 ◽  
Vol 24 (1) ◽  
pp. 64-74 ◽  
Author(s):  
M. A. Wesley ◽  
T. Lozano-Perez ◽  
L. I. Lieberman ◽  
M. A. Lavin ◽  
D. D. Grossman
Keyword(s):  
Geometric Modeling ◽  
Mechanical Assembly ◽  
Geometric Modeling System

EMBODIMENT OF AUTOMATED DESIGNATION OF SURFACE FINISH OF THE OBJECTS OF THE 3D WORKPIECE MODEL

2020 ◽  
pp. 3-9
Author(s):  
M. S. Chepchurov ◽  
B. S. Chetverikov ◽  
A. N. Maslovskaja ◽  
N. S. Ljubimyj
Keyword(s):  
Surface Finish ◽  
Geometric Modeling ◽  
3D Model ◽  
Geometric Model ◽  
3D Models ◽  
Work Piece ◽  
Electronic Model ◽  
Cad Cam ◽  
Engineering Drawings ◽  
Cross Platform

The article discusses the questions of automation of design engineering in the sphere of the formation of 3D geometric model of work-pieces. The authors have designed and carried out an algorithm in the form of the additional script in the software bundle of the geometric modeling, enabling to execute the designation of surface finish in 3D models. The algorithm is based on the freeware CAD/CAM/CAE system – FreeCAD. The structure of an element from an ordered set of data about a geometric object that identifies the surface roughness is determined that allows to expand the capabilities of methods for providing storage and transmission of data of the electronic model of the product. Creation of additional procedures based on the formed list of surface finish according to the GOST 2.309–73 makes it possible to embody 3D-model transfer to the workplaces. It means that time of embodiment of preproduction and production of work-piece can be cut. Nowadays freeware solid geometry engine with open source code is not used due to the absence of additional specific possibilities of making of engineering drawings according to the regulatory requirements. The authors have offered the method of increasing the capabilities of software bundle of the geometric modeling, which provides the increase of target audience of freeware. The authors propose to use free cross-platform language Python to create the script of designation of surface finish in the space of 3D-model. Usage of the example of the script and its testing can help to design other procedures of making of engineering drawings to create fully-featured free cross-platform geometric designing.

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