CAD in the CIM Environment: Where Do We Go From Here?

1986 ◽  
Vol 39 (9) ◽  
pp. 1345-1349 ◽  
Author(s):  
Dell K. Allen ◽  
W. Van Twelves
Keyword(s):  
Computer Aided Design ◽  
Material Selection ◽  
Operating Conditions ◽  
Computer Integrated Manufacturing ◽  
Accurate Information ◽  
Functional Requirements ◽  
Essential Information ◽  
Design Systems ◽  
Aided Design ◽  
Product Definition

The importance of computer-aided design (CAD) has not been fully appreciated as it relates to computer integrated manufacturing (CIM). The CAD product definition model can provide essential information for many down-stream production, estimating, tooling, and quality assurance functions in the CIM environment. However, the product definition model may be inaccurate or incomplete, thus causing incomplete communication with possible scrap, re-work, and missed production deadlines. Other problems are related to the fact that many of our expert designers are retiring and taking their expertise with them. Merely being able to make 2D or 3D drawings on a CAD workstation does not make its operator a designer. A knowledge of production processes, tolerances, surface finish, and material selection is needed to supplement a designers knowledge of user needs, product functional requirements, operating conditions, cost, quality, and reliability targets. One of the most promising methods for providing timely and accurate information to the designer on an “as-needed” basis is through the use of expert design systems. Such systems promise to bridge the knowledge gap between CAD and CAM and help to incorporate these functions into the overall CIM environment.

scholarly journals DEVELOPMENT OF SYSTEM OF HYDRAULIC JACK COMPUTER-AIDED DESIGN

2016 ◽  
Vol 2016 (4) ◽  
pp. 214-222
Author(s):  
Владислав Колякин ◽  
Vladislav Kolyakin ◽  
Дмитрий Орехов ◽  
Dmitriy Orekhov ◽  
Андрей Аверченков ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Parametric Models ◽  
Hydraulic Jack ◽  
Technical Documentation ◽  
Conceptual Approach ◽  
Essential Information ◽  
Hydraulic Equipment ◽  
Computer Aided ◽  
Design Systems ◽  
Aided Design

The paper reports the problems in automation of designing hydraulic jacks of oneway action. The analysis of methods of computeraided design systems creation is carried out and the algorithms of allowing the formation of a system for computer-aided design of hydraulic jacks are under development. A conceptual approach to a jack choice depending on conditions of its operation allows reducing time for the analysis of requirements specification. In the course of the work with the system there were developed eight basic modules of the system. These modules allow reducing considerably time for the technical documentation development essential for manufacturing jacks with oneway operation and decreasing other costs in the course of designing. Databases created store all the essential information for the proper work of basis modules and also that of standard products, 3 D parametric models and associative drawings. The system developed meets all the requirements imposed on CADs. It is applicable at enterprises engaged in production and repair of hydraulic equipment. The Hydraulic Jack CAD was tested at a functioning enterprise and justified hopes.

Tolerances Modeling in Assemblies: An Approach Based on Graphs

2014 ◽  
Vol 902 ◽  
pp. 378-384
Author(s):  
R.L. Avila Rondón ◽  
R. Pérez Rodríguez ◽  
A. Cordovés García ◽  
R.P. Avila Alfaro ◽  
Z. Mendoza Núñez ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Mechanical Design ◽  
Tolerance Analysis ◽  
Functional Requirements ◽  
Mechanical Assemblies ◽  
Decisive Importance ◽  
Common Task ◽  
Design Systems ◽  
Aided Design ◽  
Graph Map

In the mechanical design process, the interpretation of geometrical and dimensional tolerances is a common task in a products life cycle because tolerances are of decisive importance in the decisions related to cost and quality. At present, there are numerous approaches and investigations related to the modeling of tolerances in mechanical assemblies, related to Computer Aided Design Systems. The goal of this paper is to show a method to modeling an assembly based on a graph map structure, to guarantee the resolution of dimensional chains and tolerance analysis. In this process, which is based on a graph map structure, the dimensional chains associated to the functional requirements that influence the relative location of the parts are determined. A subset of a belt conveyor as an example, illustrates the proposed method.

Decision-making in preliminary engineering design

1991 ◽  
Vol 5 (1) ◽  
pp. 21-30 ◽  
Author(s):  
S. P. Joshi ◽  
J. R. Umaretiya ◽  
Sanjay B. Joshi
Keyword(s):  
Decision Making ◽  
Engineering Design ◽  
Computer Aided Design ◽  
Material Selection ◽  
Preliminary Design ◽  
Design Systems ◽  
Specification Synthesis ◽  
Aided Design ◽  
Weak Influence ◽  
Important Objective

A designer often has to deal with complex and ill-structured situations during specification synthesis and preliminary engineering design. To assist in the development of computer-aided design systems, it is desirable to capture the designers decision-making process during these design states. The research presented in this paper is towards this direction. Based on the conceptual understanding of the process, three postulates are presented. The following two postulates; (1) the decisions are neither optimum nor just satisfying but retain certain characteristics of both, (2) the design is driven by the important objective(s) among all the specified objectives, at the preliminary design, although the remaining objectives do have a weak influence on the preliminary design; are used to develop a compensatory and a non-compensatory model of the decision-making. These models are formulated with the help of fuzzy set theory and they implicitly or explicitly follow the two postulates. These models are suitable for discrete decision situations where the above mentioned postulates apply. Examples of material selection during a preliminary structural design are used to illustrate the effectiveness of these models.

CAD Of Anticorrosive Protection Of Steel Structures

2019 ◽  
pp. 18-23
Keyword(s):  
Protective Coating ◽  
Computer Aided Design ◽  
Steel Structures ◽  
Cost Effective ◽  
Operating Conditions ◽  
Computational Tool ◽  
Protection Method ◽  
Cost Effective Method ◽  
The Cost ◽  
Aided Design

The choice of cost-effective method of anticorrosive protection of steel structures is an urgent and time consuming task, considering the significant number of protection ways, differing from each other in the complex of technological, physical, chemical and economic characteristics. To reduce the complexity of solving this problem, the author proposes a computational tool that can be considered as a subsystem of computer-aided design and used at the stage of variant and detailed design of steel structures. As a criterion of the effectiveness of the anti-corrosion protection method, the cost of the protective coating during the service life is accepted. The analysis of existing methods of steel protection against corrosion is performed, the possibility of their use for the protection of the most common steel structures is established, as well as the estimated period of effective operation of the coating. The developed computational tool makes it possible to choose the best method of protection of steel structures against corrosion, taking into account the operating conditions of the protected structure and the possibility of using a protective coating.

Low-fidelity prototyping with simple collaborative tabletop computer-aided design systems

2018 ◽  
Vol 70 ◽  
pp. 307-315 ◽  
Author(s):  
Erdem Kaya ◽  
Sema Alacam ◽  
Yasin Findik ◽  
Selim Balcisoy
Keyword(s):  
Computer Aided Design ◽  
Computer Aided ◽  
Design Systems ◽  
Aided Design

Development of computer-aided design systems for metal-forming processes

1989 ◽  
Vol 21 (3) ◽  
pp. 185
Author(s):  
Y. Mitani ◽  
H.R.R. Merchand ◽  
E. Velazquez
Keyword(s):  
Metal Forming ◽  
Computer Aided Design ◽  
Computer Aided ◽  
Design Systems ◽  
Aided Design

Capturing and Using Designer Intent in a Design-With-Features System

1991 ◽  
Author(s):  
Eric H. Nielsen ◽  
John R. Dixon ◽  
George E. Zinsmeister
Keyword(s):  
Computer Aided Design ◽  
Simultaneous Equation ◽  
The Core ◽  
Knowledge Based ◽  
Evaluation Procedures ◽  
Equation Solving ◽  
Feature Based ◽  
Design Systems ◽  
Aided Design ◽  
Intelligent Computer

Abstract The goal of “intelligent” computer-aided-design (CAD) systems is to provide greater support for the process of design, as distinguished from drafting and analysis. More supportive design systems should provide a quick and simple means of creating and modifying design configurations, automating evaluation procedures (e.g., for manufacturing), and automating interfaces to analysis procedures. In this paper we are concerned with the issues of representing in-progress designs so that such goals can be met. A feature-based representation is proposed in which features are defined as possessing not only form but also certain designer intentions regarding geometric relationships. A working experimental version of a design-with-features system using this representation for thin-walled components illustrates its use in composing a design as a configuration of feature-forms, in modifying the design geometry through automatic, intelligent incorporation and propagation of designer-initiated geometry changes, and in providing for the generation of user-defined features. In contrast to constraint-driven simultaneous equation solving methods, this system uses an intent-driven knowledge-based method to propagate and incorporate geometry modifications not only in fully-constrained designs, but also in over- and under-constrained designs. Issues of manageability, extensibility, and computationally efficiency were considered in the development of the core services of the system.

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