In view of semiconductor wafer probe area's workshop management and control problem, with the thought of object-oriented, a behavior model of probing workshop is set up in terms of the figuration of UML. Paper put...
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ISBN:
(纸本)9780769532905
In view of semiconductor wafer probe area's workshop management and control problem, with the thought of object-oriented, a behavior model of probing workshop is set up in terms of the figuration of UML. Paper puts forward an integrated workshop control strategy considered three factors;wafer releasing speed, dispatching rule and buffer capacity. It uses the SimTalk brought by EM-plant to transform behavior model directly into simulation model. By analyzing the experimental result of simulation model, the influence of the wafer releasing speed, machine dispatching and buffer capacity upon probe performance indicators such as month output, production cycle and quantity of work in process are got. It supplies the decision maker with evidence.
In this paper, an efficient power electronic circuit simulation approach is discussed for a digitally controlled three phase active PFC converter system. The control circuit simulation software used in this simulation...
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ISBN:
(纸本)0852967047
In this paper, an efficient power electronic circuit simulation approach is discussed for a digitally controlled three phase active PFC converter system. The control circuit simulation software used in this simulation technique is also applied to the digital signal processor (DSP) based control implementation of a practical power factor correction (PFC) power conversion circuit with a digital control scheme. This circuit simulation technique is based on a circuit equation modeled by substituting control input dependent time-varying resistors in place of all the power switches incorporated in the bridge arms of the three phase active PFC converter circuit and system treated here, one,state-vector equation described by state-variables for inductors and capacitors, together with an algebraic computation method to transform the matrix of the circuit equation into matrix of the state vector equation. In addition, this paper proves the effectiveness of a voltage-fed three phase PFC converter with a digital control PWM strategy and its performance evaluations on the basis of computer-aided simulation results together with experimental results.
The software package Dymola, which implements the new, vendor-independent standard modelling language Modelica, exemplifies the emerging generation of object-oriented modelling and simulation tools. This paper shows h...
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The software package Dymola, which implements the new, vendor-independent standard modelling language Modelica, exemplifies the emerging generation of object-oriented modelling and simulation tools. This paper shows how, in addition to its simulation capabilities, it may be used as an embodiment design tool, to size automatically a design assembled from a library of generic parametric components. The example used is a miniature model aircraft diesel engine. To this end, the component classes contain extra algebraic equations calculating the overload factor (or its reciprocal, the safety factor) for all the different modes of failure, such as buckling or tensile yield. Thus the simulation results contain the maximum overload or minimum safety factor for each failure mode along with the critical instant and the device state at which it occurs. The Dymola "Initial Conditions Calculation" function, controlled by a simple software script, may then be used to perform automatic component sizing. Each component is minimised in mass, subject to a chosen safety factor against failure, over a given operating cycle. Whilst the example is in the realm of mechanical design, it must be emphasised that the approach is equally applicable to the electrical or mechatronic domains, indeed to any design problem requiring numerical constraint satisfaction.
This paper describes a qualitative modelling toolbox for designing and developing application independent architectures. The domain chosen to demonstrate the versatility of the work is an advanced robotics workcell th...
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This paper describes a qualitative modelling toolbox for designing and developing application independent architectures. The domain chosen to demonstrate the versatility of the work is an advanced robotics workcell that is part of a knowledge-based automation laboratory. Developed out of a remote monitoring application, the toolbox uses object-oriented software and encapsulates knowledge-based information from a human expert to construct the model. Being object-oriented there is full inheritance between individual objects. It was considered feasible that the original work could be the basis of a design tool for automation architectures. Currently, application specific, hierarchically ordered architectures for automation are a barrier to progress. The present monolithic layering of such architectures means fault detection and monitoring remain the domain of the human expert. Here, we can produce the qualitative model in the form of an interactive user interface that can be used in fault monitoring and diagnosis and report faults. Using this modular evolvable approach to systems monitoring has meant that we are not simply constrained to diagnosing faults at an architecture's networking level, the workcell level. We shall show how qualitative modelling can be used to considerable effect in monitoring in-depth components contained within a module that is part of the architecture. The component dealt with in this case is a robot's d.c. motor drive, components that are traditionally modelled quantitatively by control engineers.
The Battlefield Sensor Simulator (BSS) system, built at RSRE Malvern, provides for the modelling and performance evaluation of new and proposed military sensor systems. Both sensor tasking and sensor mixes may be test...
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The Battlefield Sensor Simulator (BSS) system, built at RSRE Malvern, provides for the modelling and performance evaluation of new and proposed military sensor systems. Both sensor tasking and sensor mixes may be tested interactively. The BSS system covers a battlefield area of up to 50000 square kilometres and can simulate the movement of up to 100000 targets in real time. The architecture of the BSS consists of a centralised computing facility which models battlefield terrain, culture and scenarios together with a collection of client computers which model battlefield sensors. The authors discuss the object-oriented framework which is constituted by a collection of objects known as the Generic object Set (GOS). The object-oriented framework is written in the programming language Simogen which is an object based version of C. In Simogen, objects have state variables and procedural responses. An important feature of the BSS system is that it can support concurrent sensor models running on different client computers. In the future this will form a basis from which the data fusion of different sensor systems may be modelled.< >
Concerns the modelling of complex hierarchical manufacturing systems, where overall control of the manufacturing organisation is devolved through manufacturing cells and ultimately to individual operations. control is...
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Concerns the modelling of complex hierarchical manufacturing systems, where overall control of the manufacturing organisation is devolved through manufacturing cells and ultimately to individual operations. control is maintained at the many levels by the flow of instructions from higher levels, but it is essential to the coordination of lower level activities that actual performance results in revised control through some form of feedback loop. The background of simulation is outlined in relationship to object-oriented programming, and then the proprietary software used is considered. Three strands of related research undertaken to date are described, then it is shown how these strands may be drawn together to form an integrated manufacturing system modelling package.< >
The algorithm functions realized within the framework of the AENEAS project with an emphasis on the WAVE2/MATRIXx3 simulation environment used in their implementation were discussed. The algorithm computed the values ...
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The algorithm functions realized within the framework of the AENEAS project with an emphasis on the WAVE2/MATRIXx3 simulation environment used in their implementation were discussed. The algorithm computed the values for the ignition timing based on the profile of the Cylinder Pressure. The control concept used the position of the peak pressure occurence to effect feed-back control on the spark timing. The advantages of the WAVE in emulating real engine dynamics in a block-oriented programming environment were also presented.
simulation has proven to be a highly effective means of testing the operation of systems during development, and prior to in-service modification, but it is not as widely used in industry as might be expected. The pri...
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simulation has proven to be a highly effective means of testing the operation of systems during development, and prior to in-service modification, but it is not as widely used in industry as might be expected. The prime reason for this is that model development for simulation often requires the combination of deep knowledge of the process and specialised modelling skills. One solution to this problem is the provision of a library of re-useable sub-models, which can facilitate development of hierarchically structured models. This paper illustrates the application of object-oriented methodology to achieving two major goals-the reduction of complexity by hierarchical decomposition, and maximisation of the re-use of developed models. Two applications are discussed-the generation of hierarchical models and the use of function blocks in control system design-with respect to the three dominant OO concepts of encapsulation, inheritance and polymorphism. It outlines requirements for a modelling and control tool and highlights how an OO methodology can help simplify the use of such a tool. OO implementations of modelling and control tools are described. The tools described were implemented using compiled OO languages (Pascal and C++), with the consequence that the user of she tool does not get all the advantages which would occur in an interpretive environment such as Smalltalk.< >
A software tool is described that allows a wide variety of digital radio links to be modelled at varying levels of detail. It comprises a library of some 300 C/sup ++/ classes residing within another tool that provide...
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A software tool is described that allows a wide variety of digital radio links to be modelled at varying levels of detail. It comprises a library of some 300 C/sup ++/ classes residing within another tool that provides features applicable to a wide range of modelling problems such as parameter handling, graphics facilities and simulationcontrol, as well as a basic graphical user interface. The structure of the class library and the construction of models are described. Examples of particular modelling problems show the benefits of the objectoriented approach.< >
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