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11 篇 会议

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proceedings of the 1996 iee colloquium on getting the best out of pid in machine control

Proceedings of the 1996 IEE Colloquium on Getting the Best O...

引用

proceedings of the 1996 iee colloquium on getting the best out of pid in machine control

The papers submitted to the iee colloquium on 'getting the best out of pid in machine control' organized by Professional Group 16 (machine systems engineering applications) are presented. The issues considered include: auto-tuning approach in pid control;automatic selection of pid structures for various electric drive applications;the maximum-gain, minimum-integral principle applied to materials testing;self-tuning pid control structures;tools for the implementation of enhanced pid controllers and their use in electro-hydraulic servo applications.

关键词： control

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iee colloquium on getting the best out of pid in machine control (Ref. No.1996/287)

IEE Colloquium on Getting the Best Out of PID in Machine Con...

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iee colloquium on getting the best Our of pid in machine control

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Self-tuning pid control structures

Self-tuning PID control structures

引用

proceedings of the 1996 iee colloquium on getting the best out of pid in machine control

作者： Gawthrop, P.J. Univ of Glasgow Glasgow United Kingdom

The basic concepts of pid control can be generalized within the same structure but allowing for the control of complicated dynamic systems using advanced control design algorithms. This structure arises naturally from the system description and does not need to be imposed artificially. Recent advances in Local Model networks give a neat extension of the basic (generalized) pid structure to handle nonlinear or time-varying systems.

关键词： control

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To automatically select pid structures for various electrical drive applications

To automatically select PID structures for various electrica...

引用

proceedings of the 1996 iee colloquium on getting the best out of pid in machine control

作者： He, Q. Garvey, S.D. Eurotherm Drives Ltd Littlehampton United Kingdom

Structure selection based on experience, simulations or trial and error is time consuming and inefficient. It is believed that the availability of the auto-selection of pid structure, at least an effective structure selection rule, is an important prerequisite factor for a flexible-structure controller offered in practical electrical drives. To date, a simple and effective auto-selection technique is not yet available. For the above reasons and stimulated by auto-tuning technique, this paper presents the development of the technique of pid structure auto-selection.

关键词： control

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Maximum-gain, minimum-integral principle applied to materials testing

Maximum-gain, minimum-integral principle applied to material...

引用

proceedings of the 1996 iee colloquium on getting the best out of pid in machine control

作者： Hinton, C.E. Instron Ltd High Wycombe United Kingdom

This paper describes the application of the time domain method for tuning pid controllers for servo-hydraulic and electromechanical, materials-testing machines. Good tuning is essential to ensure that applied loads and strains are faithfully replicated. The tuning method is simple to use and an automated version of it is now commercially available for materials-testing machines. The maximum-gain, minimum-integral principle is a simple and effective way to manually and automatically tune pid controllers for materials testing machines. The step response process that has been outlined should also be applicable to other types of mechatronic system. It aims to maximize the proportional gain and remove static errors rapidly but without harmful transients.

关键词： control

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Tools for the implementation of enhanced pid controllers and their use in electro-hydraulic servo applications

Tools for the implementation of enhanced PID controllers and...

引用

proceedings of the 1996 iee colloquium on getting the best out of pid in machine control

作者： Whiting, I.M. Moog Controls Ltd

pid as a control concept is adequate for many hydraulic servo drives. In some situations pid control alone does not provide an adequate solution and other strategies must be adopted. One approach to achieving these aims is by the use of a control function block library, included as an integral part of the drive controller. This paper describes the essential characteristics and some examples of the so called 'Programmable Servo controller' (PSC) used by the author in electro-hydraulic servo control applications. The PSC function block approach to controller design provides the tools whereby the machine designer is easily able to enhance the normally used pid approach to control. In difficult control applications, the use of non-linear and logical functions allows significantly more performance to be achieved from the same drive package compared to using pid alone. This is demonstrated in the high pay-load drive (used as an example in this paper) and in many other applications which have been undertaken suing Programmable Servo control.

关键词： control

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Some advantages of the autotuning approach in pid control

Some advantages of the autotuning approach in PID control

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proceedings of the 1996 iee colloquium on getting the best out of pid in machine control

作者： Atherton, D.P. Univ of Sussex Brighton United Kingdom

The objective of this brief paper has been to review the autotuning method for pid controllers and to highlight the many advantages of the approach. Recently Astrom and Hagglund suggested replacing the P controller by a relay and measuring the amplitude and frequency of the oscillation from which approximations to Kc (critical gain) and ωc (critical frequency) can be found using describing function analysis. The major advantages of this approach are that the limit cycle amplitude can be controlled by the relay output, no mathematical model of the plant is required and the test can easily be done by a process operator, when the controller has a relay facility. The theory of the autotuning method is presented and a simple example which illustrates the robustness of frequency response tuning is given. pid tuning algorithms which can be used based on knowledge of ωc and Kc are discussed.

关键词： control

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To automatically select pid structures for various electrical drive applications

To automatically select PID structures for various electrica...

引用

iee colloquium on getting the best Our of pid in machine control

作者： Q. He S.D. Garvey Eurotherm Drives Limited Littlehampton West Sussex UK Mechanical and Electrical Engineering Department Aston University Birmingham UK

Although many advanced automatic control techniques have arisen for the last couple of decades, the pid controller is still the most commonly used controller in industry; and particularly so in electrical servo drives. The popularity of pid in industry is mainly due to the simple and direct means available for the trial and error approach for designing and tuning the controller, in contrast with the methods needed for designing other type controllers. The paper presents the development of the technique of pid structure auto-selection.

关键词： Proportional control

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Self-tuning pid control structures

Self-tuning PID control structures

引用

iee colloquium on getting the best Our of pid in machine control

作者： P.J. Gawthrop Centre for Systems and Control & Department of Mechanical Engineering University of Glasgow Glasgow UK

There has been much work on self-tuning pid controllers. There are many possible structures for pid controllers. The basic concepts of pid control can be generalised within the same structure but allowing for the control of complicated dynamic systems using advanced control design algorithms. This structure arises naturally from the system description and does not need to be imposed artificially. The concept of pid control can be usefully generalised to make contact with recent methods such as internal-model control and generalised predictive control. One should not start with a pid controller and then decide how to tune it, but rather one should start with a rational design method and system model from which a (generalised) pid structure will then materialise. Recent advances in local model networks using multiple-model self-tuning pid controllers give a neat extension of the basic (generalised) pid structure to handle nonlinear or time-varying systems. The pid concept is alive and well.

关键词： Proportional control

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Some advantages of the autotuning approach in pid control

Some advantages of the autotuning approach in PID control

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iee colloquium on getting the best Our of pid in machine control

作者： D.P. Atherton School of Engineering University of Sussex Sussex UK

The normal approaches to control system compensator design in both classical and modern control first require one to obtain a mathematical model of the process. This is also usually the case even when the form of compensator has been decided and only its parameters need to be found or tuned. This procedure suffers from two disadvantages, firstly the need to find a mathematical model which may be time consuming and not necessarily straightforward, and secondly if tuning in situ is required because the model is poor or its parameters change with time further modelling has to be done or some other approach has to be used. In this paper the theory of the autotuning method is presented and this is followed with a simple example which illustrates the robustness of frequency response tuning. The paper discusses pid tuning algorithms and briefly outlines additional facets of autotuning. Finally some conclusions are given.

关键词： Tuning

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