Integrated Computer Aided Design System Research Articles

Designing a Die for Hydroforming

Abstract Designing a die is in every application field an intensive process of bringing together know how from design, testing and every-day use from previous dies with the new application requirements. Contribution deals with a knowledge oriented, modular and feature integrated computer aided design system for die development. This paper describes the concepts behind designing a hydroforming die for sheet metal forming, with easy application-use in small workshops for testing hydroforming capabilities of different materials.

An object-oriented database management system for computer-aided design of tall buildings

An effective database and database management system is the key to the success of an integrated approach to software engineering applications in general, and Computer-Aided Design (CAD) for structural applications in particular. Due to the inherent nature of CAD data such as dynamic modeling, a wide range of data types, large data volume, etc., the traditional database models, such as hierarchical, network and relational models, are unable to handle the aforementioned applications satisfactorily. An object-oriented data modeling is known to be the most effective approach. However, many of the commercial object-oriented databases are designed for information management, and they are inadequate for CAD application due to the different features of the object-hierarchy and varying data management objectives during the design cycles. This paper presents a hierarchical index-based object-oriented database management model for CAD applications. To deal with the object hierarchy encountered in CAD for the design of tall buildings, the proposed database consists of several salient features: a hierarchical object model, its related storage structure, a data dictionary, a class factory and an index system. The proposed database management model has been implemented into an integrated CAD system for design application of tall buildings.

Architecture of an integrated computer-aided design system for optoelectronics

To design and package optoelectronic (OE) systems more effectively, computer-aided design (CAD) systems are needed in the engineering environment. The use of CAD systems for designing electronic computing systems is well accepted by the electronic community. CAD systems for engineering optical design are also widely used in the optics community. However, design automation of OE engineering requires more than the existing tools for system component design. Also required is research on OE design methodology and a complete set of tools. We explore a new area that will be important to OE system design: OE system CAD. We present an integrated CAD system for free-space optical interconnected optoelectronics that leverages on existing CAD technologies. The details of the system and the guidelines for developing compatible tools are described. Case studies of two OE CAD tools developed using these guidelines are also presented.

CAPTD: A Low-Cost Integrated Computer Aided Design System for Press Tool Design

This paper describes the structure and operation of a low-cost computer aided design system for press tool design (CAPTD). The system is a collection of integrated industry standard microcomputer packages and purpose-built programs. The packages include AutoCad 11, for the input of workpiece geometry and the output of the press tool part and assembly drawings, and dBase IV for the decision support, the selection of press tool components and generating output reports. A purpose built ‘C’ program is also developed for the layout and nesting of the workpiece. The system is driven by a set of press tool design rules implemented in both the dBase IV and ‘C’ programming languages. The system is developed to run on 80386SX or higher based IBM-compatible microcomputers.

The design of a complex building using an integrated CAD system

What is it really like to develop and use a large integrated computer aided design system to design an extensive complex building? Much has been written on the subject of CAD applied to building design. But does the reality bear any resemblance to the theory? What are the effects of time and scale on the process? Are the claims for CAD justified and are the benefits the ones which were expected? The new District General Hospital at Milton Keynes in the U.K. is probably the first major building in the world to be designed using such a system. Now under construction on site it has been a fertile and rewarding experience. In comparison with what was originally expected, the outcome has in many cases been quite exciting, in a few cases disappointing, but in a number of instances the outcome has been very surprisingly different from the original aspiration. Overall the result marks a very substantial step forward in the process of designing complex buildings.

An integrated computer-aided design system for custom LSI circuits

An integrated computer aided design system for the design, layout and layout verification of integrated circuits is described. The imagery required for photofabrication of an integrated circuit is created by computer from a place and interconnect data base and a design library system. The imagery created by the computer is analyzed to verify conformance to design rules and proper interconnections. Simulation files are produced for additional verification of interconnects and circuit design.

Integrated Computer Aided Design System for Process Design

This paper describes a computer aided design system INSYPS for study of complex chemical processes. It handles graphical input/output, dynamic simulation, steady state simulation and optimization. The simulators and optimization techniques employed are well known, it has been designed in a modular fashion, it is implemented on DEC System-10 and performs graphic operations on a Tektronix-4013 terminal; the largest of its module loads in under 28k. It utilizes the file system for transfer of information from one subsystem to another. The entire package is Fortran based.The system has been successfully applied to a study of a plant in Sarnia, Ontario, Canada.