摘要:

A knowledge-based expert system for preliminary design of mediumrise buildings has been implemented with the ability to generate building configurations. The system was developed on GEPSE, a microcomputer-based expert system development tool, which provides an environment in which predicated objects are separate from the rule bases. The inference mechanism utilises forward chaining and metalevel control. It has been shown that, based on the information taken from a user, the system generates a solution in terms of a list of proposed parameters. These parameters for preliminary design are suitable for future coupling to numerical analysis software for structural analysis and design. To further enhance the system capabilities, the knowledge base can be expanded for improved performance and graphics facilities can be incorporated for graphical manipulation and editing.

DOI:10.1049/cae.1991.0002

出版商:IEE    

年代:1991

数据来源: IET

摘要:

The integration of computer numerical control (CNC), metrology and three-dimensional CAD/CAM systems provides a powerful means of capturing geometrical data of complex solid objects for which no drawings exist. The captured geometry can then be modified, analysed and submitted for machining as desired. In this article, the effectiveness of such an integrated system is illustrated in the particular application of the design and manufacture of rings.

DOI:10.1049/cae.1991.0003

出版商:IEE    

年代:1991

数据来源: IET

摘要:

Methods for automated process planning and NC programming are surveyed and classified into generic categories. Aspects of CAPP investigated include part definition methods, reasoning and search techniques used to generate process plans, both Al-based and traditional, and process planning languages. NC programming techniques have been categorised into those based on cell decomposition, volume/delta volume decomposition, sectioning and geometric reasoning. Methods for simulation and verification of NC programs are also surveyed. The current state of the technology and the advantages and shortcomings of each of the CAPP and NC programming generic methods are also discussed.

DOI:10.1049/cae.1991.0004

出版商:IEE    

年代:1991

数据来源: IET

摘要:

This article outlines a project that forms part of a Teaching Company Scheme involving the simulation of manufacturing systems. Particular emphasis has been given to the process of developing a simulation model capable of evaluating the operational characteristics of a material handling system operated within a Just-in-Time (JIT) environment. The main objective is to identify operational problems specific to the material handling system which may become apparent due to changes in operational methods under JIT. The complex nature of operations and large amounts of initial data created a set of techniques which can be used in further simulation studies. The Teaching Company programme is between Unisys Ltd., Livingston, and Napier Polytechnic, Edinburgh. This article does not attempt to describe current operating conditions.

DOI:10.1049/cae.1991.0005

出版商:IEE    

年代:1991

数据来源: IET