The major aim of this research work was to develop an Intelligent Design Environment for Supporting Concurrent Product and Process Design. The system was designed in such a way to enable users to monitor the design as...
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The major aim of this research work was to develop an Intelligent Design Environment for Supporting Concurrent Product and Process Design. The system was designed in such a way to enable users to monitor the design as it progresses and to improve quality and reduce the cost. It has also the facility to examine if the designed part can be manufactured in house with the available manufacturing facilities and provides feedback related to machining concerns that may arise. The development process was passed through three fundamental stages to accomplish the proposed paradigm These stages were: first, developing a technique for automated feature recognition from a solid modeller, secondly, linking a Knowledge-based with a Solid Modelling and a Process Planning System and finally, building a Constraint Knowledge-based System which could provide feedback connected with manufacturability concerns such as process limits or design inconsistencies. It also gives a predictable machining cost estimation and continuous feedback to designers about possible manufacturing issues or requirements as the design proceeds. Developing an approach for feature recognition was substantial for a number of reasons; most solid modellers available today represent part geometry in terms of low-level geometric and topological entities such as faces, loops, edges, surfaces, curves and points. These modellers do not provide higher level abstractions of a part that relate directly to certain design functionalities or manufacturing characteristics. Therefore, these systems cannot be used directly to derive applications such as design analysis, machining cost estimation or process planning which are the core of this research. A solid modeller package (Pro/Engineer) has been enhanced to co-operatively assist designers in creating new applications that can be directly integrated into the CAD System (Pro/Engineer) environment and extracting the necessary topological and geometrical information from the so
PARC++ is a system that supports object-oriented parallel programming in C++. PARC++ provides the user with a set of predefined C++ classes that can easily be used for the construction of parallel C++ programs. With t...
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PARC++ is a system that supports object-oriented parallel programming in C++. PARC++ provides the user with a set of predefined C++ classes that can easily be used for the construction of parallel C++ programs. With the help of PARC++ objects, the programmer is able to create and start new processes (threads), to synchronize their activities (Blocklock, Monitor) and to manage communication via message passing (Mailbox). PARC++ is written in C++ and currently runs on top of the EMEX operating system on a FORCE machine with 11 processing elements and an EDS (European Declarative System) with 28 processing elements. The paper also contains information about the run-time system model, the implementation and some performance measurements.
Traditionally, finite state machines based approaches are used in real-time object-oriented systems development for modelling the dynamic behaviour of an object. Finite state machines based approaches, however, suffer...
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Traditionally, finite state machines based approaches are used in real-time object-oriented systems development for modelling the dynamic behaviour of an object. Finite state machines based approaches, however, suffer from several problems when used for modelling large and complex objects. As an alternative, an extended object model, LAYOM and an associated modelling approach is proposed aiming to solve the aforementioned problems and other problems related to object state .
The object-oriented methodology(OOM) combined with AI techniques plays an increasing important role in development of intelligent systems. This paper contributes to the trend with a discussion of a knowledge–based, o...
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The object-oriented methodology(OOM) combined with AI techniques plays an increasing important role in development of intelligent systems. This paper contributes to the trend with a discussion of a knowledge–based, object–oriented problem–solving method. In this method the knowledge required to analyse the problem and to synthesize the solution is embedded into objects. The construction of a prototype of problem-solving system is discribed with examples and its implementation in C ++ is given.
In January 1993, Pyramid Resources began a one year project to implement a plant-wide supervisory expert control system at a large U.S. copper concentrator. The objective of this control system was and continues to be...
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In January 1993, Pyramid Resources began a one year project to implement a plant-wide supervisory expert control system at a large U.S. copper concentrator. The objective of this control system was and continues to be to improve plant profitability through unit operation optimization and global integration of the individual control strategies. This paper documents the key aspects of the project, including: economic and metallurgical benefits, system architecture, concepts of implementation, process control strategies, practical aspects of implementation and conclusions. The expert control system has been used over ninety-five percent of the time since its completion and the benefits are estimated to exceed $50,000 per day.
A CAE (Computer-Aided-Engineering) hardware and software platform for designing fuzzy control system is presented in this paper. Capable of integrating all the four phases for the design, namely, tuning, simulation, p...
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A CAE (Computer-Aided-Engineering) hardware and software platform for designing fuzzy control system is presented in this paper. Capable of integrating all the four phases for the design, namely, tuning, simulation, prototyping and field test, the platform allows the whole design process to be cycled easily and efficiently, thus speeds up the control system design and prototyping considerably. The hardware architecture of the dedicated standalone controller is discussed. The software development is outlined.
An intelligent real-time system has been developed to monitor greenhouse sensor signals. Its objective is to resolve errors in the data due to faulty sensor readings. The system (FLASH - Flexible Artificial Intelligen...
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An intelligent real-time system has been developed to monitor greenhouse sensor signals. Its objective is to resolve errors in the data due to faulty sensor readings. The system (FLASH - Flexible Artificial Intelligence for Signal Handling in real time) uses a novel knowledge-based approach for fault detection and isolation. It comprises three modules: Scheduler, Signal Processing and Reasoning, which communicate via a Blackboard. FLASH has been implemented in C++ on a Sun Workstation running Solaris 2.
A plant growth modeling support system which was programmed in Smalltalk was developed and tested. The measured environment data was automatically received from the greenhouse controller through the computer network, ...
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A plant growth modeling support system which was programmed in Smalltalk was developed and tested. The measured environment data was automatically received from the greenhouse controller through the computer network, and was cumulated by the system. The system used the cumulated data to simulate the plant growth. The system was the first step to construct the plant growth control expert system which related the environmental data with the plant growth.
An expert system was developed to assist lime growers and agricultural extension agents in the cultivation of lime. The program, LIMEX, includes assessment, irrigation, fertilization, and pest control recommendations....
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An expert system was developed to assist lime growers and agricultural extension agents in the cultivation of lime. The program, LIMEX, includes assessment, irrigation, fertilization, and pest control recommendations. A methodology interactively using knowledge engineering and software engineering processes and based on KADS was used to design and develop LIMEX. LIMEX was implemented on the CLIPS shell integrated with C++. Verification and validation procedures were conducted throughout the design and development of LIMEX. The paper examines the structure and capabilities of the field prototype of LIMEX, which precedes the final product.
The didactic system developed at São Paulo University, the MFG Toolkit, consists of a simulator for control objects and a controller. In both systems it is utilized the same modeling tool, the MFG/PFS (Mark Flow ...
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The didactic system developed at São Paulo University, the MFG Toolkit, consists of a simulator for control objects and a controller. In both systems it is utilized the same modeling tool, the MFG/PFS (Mark Flow Graph/Production Flow Schema), derived from Petri Nets. This modeling tool is the keystone of the MFG/PFS Methodology. The case study shown here illustrates the operation sequence for the MFG Toolkit which involves the usage of MFG/PFS Methodology for contriving a model for a given control object and a control algorithm for it.
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