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检索条件"任意字段=IEE Colloquium on Model Validation for Control System Design and Simulation"

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simulation analysis of hydro-mechanical systems

Simulation analysis of hydro-mechanical systems

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colloquium on simulation of Dynamical systems

作者： Foss, A.M. Cambridge Control Ltd Cambridge United Kingdom

Dynamic simulation is at the heart of control system development. Two case studies of hydromechanical applications are used to illustrate the use of simulation to this end. simulation of bridge lifting machinery, initially for design verification proved a valuable tool for control system development. simulation of a sheet steel coiler gave an insight into the dynamic limitations of the machine as well as providing for control law design. Despite the many different applications, resulting simulation model structures and development patterns are surprisingly similar. Recognition of such similarities has enabled the use of a standard simulation development procedure offering the advantages of ensuring high-quality simulations in a cost-effective, controlled and reliable manner.

关键词： Hydraulic Machinery

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Automated system modelling

Automated system modelling

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colloquium on Bond Graphs in control

作者： Gawthrop, Peter Univ Glasgow United Kingdom

system modelling can be viewed as a sequence of transformations taking the physical system through a sequence of representations to obtain an appropriate system model. Relevant physical systems are, for example: a robot, a distillation column, a manufacturing system, a gas turbine, company economics, and a plastic extruder. This mix of systems demonstrates firstly the range of systems which we hope to model and secondly, the varying complexity of the systems which we hope to model. Relevant uses of the model are, for example: control design, process design, simulation, and system understanding. Some forms of the model might be: a frequency response of a linear transfer function, a pole-zero description of a linear transfer function, a human readable equation, machine readable (possibly non-linear) simulation code. Clearly, the appropriate form of the model corresponds to the use to which the model is to be put. We have chosen bond graphs as Representation in the context of continuous system modelling. The tools for accomplishing such transformations are discussed. Examples of use are given.

关键词： systems Science and Cybernetics

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Effect of recent advances in computer technology on dynamic process simulation

Effect of recent advances in computer technology on dynamic ...

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colloquium on Cost Effective Industrial simulation

作者： Wynn, P.D. Sast Ltd

Modern dynamic simulation in the continuous process industries is based around the successive solution of the (usually large) set of differential, algebraic and integer equations describing the time dependent behaviour of a process plant with associated control and protection systems. The equations are the physical realisation of the abstract model used to represent the plant. Process plants are inherently time varying. Dynamic simulation can provide insight and solutions not available through other techniques. simulations of all but the simplest plants are very demanding on computer power and, to a lesser extent, on memory. Recent rapid advances in computing power have had a dramatic effect on the importance of dynamic simulation throughout the processing industries. The increased availability of power has been accompanied by improved user interface design, particularly with the recent advent of, the X-window system standard. Applications produced for Unix based systems are usually 'open' which tends to prolong their useful life and makes on-going development more cost effective. Trends in simulation methods are discussed. There is, the possibility of a huge jump in power availability at a reasonable price as parallel processing computers become available.

关键词： Process Engineering

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Computer aided system design and validation in the defence environment

Computer aided system design and validation in the defence e...

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iee colloquium on Case Studies in Industrial control

作者： H. Wilson Defence Systems Division Short Brothers Public Limited Company Belfast UK

A canard-controlled missile airframe configuration with a twist-and-steer (or polar) control system affords economies in design and kinematic performance but at present does not permit a direct analytical solution for the optimum guidance and roll control autopilot laws. The development of a stable roll loop of adequate bandwidth and response is fundamental in a twist-and-steer missile. Whilst the application of modern control theory has been successfully applied to the design of aileron-constrained time-invariant cases, its extension to the nonlinear case requires further development. Roll loop design is commonly carried out using frequency-domain methods coupled with detailed mathematical modelling and digital simulation. The use of commercially available control system design programs facilitates loop design and sensitivity studies across the operating envelope. Describing function techniques may be used to investigate limit cycle stability etc. The paper discusses the aerodynamics and the computer-aided design.< >

关键词： design automation Military computing Missiles

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Parallel methodologies for large-scale simulation

Parallel methodologies for large-scale simulation

引用

iee colloquium on Parallel Processing in control - the Transputer and Other Architectures

作者： A.W. Burton Control Syst. Centre Univ. of Manchester Inst. of Sci. & Technol. UK

system simulation involves the construction of a computational analogue of a physical system-a process which has traditionally been associated with intemperate demands on processing time. This is more true today than ever before. Complex large-scale plant simulators and process mimics are almost commonplace in some high-technology industries. In such settings, simulation may be used in both the design and validation of novel control strategies, as well as forming part of an operator training programme, or in cause-consequence diagnostics. The problem arises that as physical systems evolve in complexity, the dimensionality of the underlying dynamical equations can rise dramatically, creating an immense computational burden at simulation time. Often this may result in the violation of any real-time constraints, and the effects may become so acute as to render computer times that are excessive to the point of impracticality. Consequently, the authors are concerned with the development of parallel methodologies for such problems. Attention is focused on a necessarily restricted set of large-scale systems (LSS): those that are adequately described by high-dimensional sets of ordinary differential equations (ODE's) in state-space form. It should be noted however, that many of the general concepts relating to parallelism exploitation, extend to a much wider class of problems.< >

关键词： simulation Parallel algorithms

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Automated system modelling

Automated system modelling

引用

iee colloquium on Bond Graphs in control

作者： P. Gawthrop Engineering Design Research Centre and Department of Mechanical Engineering University Glasgow Glasgow UK

system modelling can be viewed as a sequence of transformations taking a physical system through a sequence of representations to obtain an appropriate system model, in any of a number of forms. The first transformation is probably the most difficult to accomplish and always depends on the skill of the engineer: thus it probably cannot, and certainly should not, be completely automated. For this reason, it is important that the first representation should be 'close' in some sense to the physical system. Equally, it should contain enough information to generate all of the required models. Bond graphs are therefore chosen for the first representation in continuous system modelling. The intermediate transformations probably can, and certainly should, be completely automated. A set of tool for the purpose is described.< >

关键词： simulation Graph theory

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Multivariable control of gas turbines for ASTOVL applications

Multivariable control of gas turbines for ASTOVL application...

引用

iee colloquium on Successful Industrial Applications of Multivariable Analysis

作者： A.E. Sutton Propulsion Department Royal Aerospace Establishment UK

The Harrier Aircraft is capable of 'short take off and Vertical Landing' (STOVL) but is incapable of supersonic flight. designs for a supersonic replacement generally involve a power plant with more degrees of freedom, requiring more complex control. The Harrier power plant is a single Pegasus gas turbine. The fuel flow to the engine determines the thrusts developed at the two front nozzles and two rear nozzles, in a predetermined way. control is relatively straightforward since a single input, fuel flow, determines the thrust output, and only small changes of pitch moment are produced. High pressure air from the engine is ducted to the wing tips and to the aircraft tail for the reaction control system which enables aircraft pitch, roll, and yaw to be controlled and trimmed during hover and transition. The article describes work on power plant control for an aircraft concept known as Advanced vectored Thrust. Studies have been confined mostly to the hover case, using thermodynamic simulations of the engine, together with a simple airframe model. The first step was the design of a suitable engine control system, which was subsequently modelled and integrated with the engine simulation. This was then included within the airframe model with a simplified controller in order to investigate the response of the airframe to engine thrust changes.< >

关键词： Aircraft control Gas turbines Multivariable systems

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An expert tool for model validation

An expert tool for model validation

引用

iee colloquium on model validation for control system design and simulation

作者： I. D'Antone L. Fortuna A. Gallo G. Nunnari Istituto Nazionale di Fisica Nucl. Bologna Italy

The role played by the reduced order model techniques in the problem of model validation for control purposes is pointed out. The validation problem is formalized as a decision making problem and a knowledge-based approach for the solution is outlined. There is a discussion of work in progress to investigate more efficient methodologies to attribute certainty factors in the rules illustrated.< >

关键词： design automation control systems Decision-making simulation Expert systems

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modelling issues in automatic process control

Modelling issues in automatic process control

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iee colloquium on model validation for control system design and simulation

作者： R.R. Leitch H.C. Quek Department of Electronics and Electrical Engineering Heriot-Watt University Edinburgh UK

Once a model has been developed, it is often the case that the tacit assumptions underlying its validity are forgotten or neglected. The paper addresses this question of well-posedness or model validity, as opposed to the question of model verification. The modelling process is outlined, and attention is drawn to the model boundary, the deductive theory and experimental laws, representation languages (mathematical and other representations), model abstraction and model resolution.< >

关键词： modeling Process control

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modelling of distributed parameter systems for control

Modelling of distributed parameter systems for control

引用

iee colloquium on model validation for control system design and simulation

作者： C. McGreavy R.M. Filho Department of Chemical Engineering University of Leeds Leeds UK

A system model must represent the physical processes and enable reliable interpretations to be made, while not being too complicated computationally. The numerical solution procedure must be reliable and robust. The usual validation strategy for this point is to isolate subsets which are arranged to reflect the way in which the equations are derived. This does not directly indicate the number of solutions, but provides a basis for graphical representation of the equations which enables the common points to be identified. A parametric survey then generates response patterns from which general trends can be recognised, and this is important in validation.< >

关键词： Distributed parameter systems modeling

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