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Computer-Aided Engineering Journal

Issue 6 • Date Dec 1991

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Displaying Results 1 - 5 of 5
  • Real-time collision avoidance in two-armed robotic systems

    Page(s): 233 - 240
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1080 KB)  

    Owing to the complexity of certain tasks, in particular those within a hazardous environment, there is a perceived need for robotic systems to have two-armed flexibility. The practical realisation of a teleoperated two-armed manipulator system raises a number of problems regarding operation and control. Of particular note is the problem of collision avoidance between the arms in real-time. A review of current techniques has shown a reliance on accurate knowledge, both of the environment and of the manipulator. Whereas collision avoidance with the environment will depend on sensors and the operator's skill, that between the two arms can be best left to the robot's controls system. A possible solution for collision avoidance is presented, which depends on the individual links of the manipulators being modelled as a number of spheres View full abstract»

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  • What has happened to CADCAM?

    Page(s): 229 - 232
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (356 KB)  

    The author makes use of his experience in developing the DUCT CADCAM system at the University of Cambridge and as partner in the firm of Weber CAM GmbH, which programs for the pattern- and mould-making shop Firma August Weber Modellbau in Hildesheim, Germany. He discusses why CADCAM is so little used in the mechanical engineering industry and why designers use CAD systems with little understanding of CAM. Until design and manufacturing directors have a common policy, progress will remain slow View full abstract»

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  • Generative feature-based design-by-constraints as a means of integration within the manufacturing industry

    Page(s): 261 - 267
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    The article examines the development of computer aids within manufacturing industry and proposes an alternative approach to the way we design and the designer's role within manufacturing. A feature-based generative design-by-constraints approach is applied, which requires the designer to specify solutions in terms of manufacturing data, which is captured by means of an interactive simulation of machining processes, in which the constraints of equipment, materials and tools are displayed to the designer. The effect of this approach on the integration of all areas within a manufacturing environment is explored, as is the simultaneous design nature of this approach View full abstract»

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  • A framework for design and development of real-time IKBS applications

    Page(s): 241 - 253
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (892 KB)  

    A framework for the design and development of real-time and software fault-tolerant intelligent knowledge-based system (IKBS) is described. It uses an extended notation of structured analysis/structured design (SA/SD) to identify and analyse the requirements, and to arrive at a set of data and control transformations. This set forms the background to identify and describe a set of objects, in the sense of object-oriented programming (OOP), and a set of rules to manipulate these objects in realising the dynamic behaviour of the IKBS application. Thus, it provides a mapping of different concepts of real-time SA/SD onto OOP and IKBS. The framework also identifies two strategies to incorporate software fault tolerance in an object-oriented perspective, and prescribes `progressive reasoning' to meet the real-time needs of the application. An example application is discussed concerning the cage monitoring system associated with a mine window View full abstract»

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  • Design of an expert system for generating optimal assembly sequences

    Page(s): 255 - 259
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    Basically, an assembly process is a sequence of positioning and fixing in position between the parts of the system to be assembled. However, finding this sequence automatically remains a very complex procedure because of the combinational aspect of the problem. The conventional programming methods of generating the ordered sequence cannot satisfy the modern factory requirements. The new approach, which seems more promising, considers artificial intelligence techniques and particularly the knowledge-based systems concept. This article presents the design of an expert system for assembly planning, with a description of all its components View full abstract»

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