Abstract
The next generation of computer aided tools should address the traditional role of engineering within a manufacturing organization, i.e. accurate communication of manufacturing specifications. Communication is the business of manufacturing engineering: translating design specifications into process plans and information such as estimating time and cost, process geometry creation and tolerance charting, determining tooling, and the recording of best practices. The integration of the product and process geometry with manufacturing knowledge is evolving through the use of computer aided process modeling and best practice sharing, to better serve production, which in turn delivers quality product at the right cost and tempo. These computer aided systems will have easy accessibility, inherent configuration control, and a “manufacturing language.” q2000 Elsevier Science Ltd. All rights reserved.
Keywords: Process modeling; Variant planning; Manufacturing engineering
January 2, 2010
Communication: computer aided engineering in the next millennium
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January 2, 2010
Abstract
This paper presents a service marketplace vision for enterprise-wide integrated design modeling. In this environment, expert participants and product development organizations are empowered to publish their geometric design, CAE, manufacturing, or marketing capabilities as live services that are operable over the Internet. These services are made available through a service marketplace. Product developers, small or large, can subscribe to and flexibly inter-relate these services to embody a distributed product development organization, while simultaneously creating system models that allow the prediction and analysis of integrated product performance. It is hypothesized that product development services will become commodities, much like many component-level products are today. It will be possible to rapidly interchange equivalent design service providers so that the development of the product and the definition of the product development organization become part of the same process. Computer-aided design tools will evolve to facilitate the publishing of live design services. A research prototype system called DOME is used to illustrate the concept and a pilot study with Ford Motor Company is used in a preliminary assessment of the vision. q2000 Published by Elsevier Science Ltd. All rights reserved.
Keywords: Integrated modeling; System modeling; Design service marketplace
January 1, 2010
A semantic feature language for sculptured object modelling
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Abstract
Feature technology is a promising approach for modelling an object since it provides a systematic representation scheme for the object semantics in various engineering application domains. A semantic oriented feature language is proposed in this paper to cover the modelling of the sculptured object class. The language consists of two components: vocabularies and grammar. Features and feature relationships are vocabularies of the language manipulated by the grammar. Although geometry is the main characteristic that differentiates the sculptured object from the regular shaped object, it is just a set of auxiliary information in the feature vocabulary class. The relationships between various features within a sculptured object reflecting its functionality are the major concerns. Parametric modelling of sculptured objects is also discussed in the feature language. q2000 Elsevier Science Ltd. All rights reserved.
Keywords: Sculptured object; Features; Feature modelling; Feature semantics
January 1, 2010
Abstract
We are dealing with the problem of space layout planning here. We present an architectural conceptual CAD approach. Starting with design specifications in terms of constraints over spaces, a specific enumeration heuristics leads to a complete set of consistent conceptual design solutions named topological solutions. These topological solutions which do not presume any precise definitive dimension correspond to the sketching step that an architect carries out from the Design specifications on a preliminary design phase in architecture. q2000 Elsevier Science Ltd. All rights reserved.
Keywords: Layout; Heuristic; Optimization; Constraints; Conceptual design; Topological solutions
January 1, 2010
Integrated solid modeller based solutions for machining
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Abstract
Most existing machining simulation software is geometric in nature, and ignores the physical aspects of the process. This paper reports research progress towards developing a comprehensive physical machining process simulation program based on a solid modelling kernel. Both flat and ball end tools are modelled, and multi-axis motion is supported. A Finite Element Analysis model is used to predict both tool and part deflection. A special sweep representation is used for Boolean part model updating. The system can be used for prediction as well as for intelligent factory floor control. Several examples of completed work are included to illustrate developed techniques. A discussion section presents computation time data, and outlines how parallel processing could be utilised. q2000 Elsevier Science Ltd. All rights reserved.
Keywords: Solid modelling; Finite element analysis; Machining simulation
