EP0440720A1 - Dispositif de traitement de informations permettant d'identifier des systemes sujets a des perturbations periodiqus - Google Patents

Dispositif de traitement de informations permettant d'identifier des systemes sujets a des perturbations periodiqus

Info

Publication number
EP0440720A1
EP0440720A1 EP19890912277 EP89912277A EP0440720A1 EP 0440720 A1 EP0440720 A1 EP 0440720A1 EP 19890912277 EP19890912277 EP 19890912277 EP 89912277 A EP89912277 A EP 89912277A EP 0440720 A1 EP0440720 A1 EP 0440720A1
Authority
EP
European Patent Office
Prior art keywords
equation
plant
disturbances
given
accordance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19890912277
Other languages
German (de)
English (en)
Inventor
Graham Paul Eatwell
Colin Fraser Ross
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Active Noise and Vibration Technologies Inc
Original Assignee
Topexpress Ltd
Active Noise and Vibration Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Topexpress Ltd, Active Noise and Vibration Technologies Inc filed Critical Topexpress Ltd
Publication of EP0440720A1 publication Critical patent/EP0440720A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
    • G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
    • G05B13/045—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance using a perturbation signal
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B21/00—Systems involving sampling of the variable controlled
    • G05B21/02—Systems involving sampling of the variable controlled electric

Definitions

  • This invention relates to a signal processing system for characterising a plant subject to periodic or almost periodic forcing.
  • the expression plant is employed herein to describe any closed system such as an industrial plant, a motor vehicle, or aeroplane, or machine etc.
  • a signal which is time- related to the disturbance (y(())
  • a signal processing system is provided to estimate the disturbances and to characterise the plant, wherein a sampling of the plant response is performed in an analogue to digital converter (ADC) and the signal T(t) is used as a trigger to synchronise the sampling process of the Analogue to Digital Converter.
  • ADC analogue to digital converter
  • the signal processing system estimates that part of the measured plant output which is due to unknown inputs and estimates the relationship between the plant output and the known plant inputs.
  • the first simplification occurs when the input to the plant u(t) is periodic.
  • n(t) The noise, n(t), can be reduced by averaging over many cycles so that it can be ignored in the following
  • the small changes to U can either be as the result of changing control signals or, to avoid ill-conditioning, the result of psuedo-random changes made by the
  • n is the transform variable, which corresponds to the harmonic number if a finite Fourier transform is used, and and b n are as given in (3.14) and (3.15).
  • Expression (3.16) and the single channel version, (3.13), are in a form which allows the use of standard algorithms for parameter estimation.
  • One solution is as given by (3.19) as amplified by (3.20) and (3.21).
  • the solutions to (3.20) and (3.21) can be obtained recursively as in G.C. Goodwin & R.L. Payne, "Dynamic System Identification: Experiment Design and Data
  • the system shown differs from previous systems in that the sampling in the ADCs is controlled by the external trigger signal T(t) which is time related to the disturbance
  • a preferred configuration employs transform and inverse- transform modules.
  • the transform has the property that it diagonalises circular matrices such as that occuring in equation (3.8).
  • the solution can be obtained without the use of orthogonal transforms but this would generally require more computation.
  • a signal processing system embodying the invention can be in equation (3.8).
  • the solution can be obtained without the use of orthogonal transforms but this would generally require more computation.
  • a signal processing system embodying the invention can be used in conjuction with an active control system.
  • the desired signal is then zero
  • the disturbance y(() is the output from sensors due to the sound or vibration to be cancelled
  • the signals u(t) are the drive signals sent to the actuators and the plant represents the acoustic or vibration path from the actuators to the sensors
  • the required actuator drives are as given by equation (3.22).
  • the matrix A n has components given by (3.23) and the vector y n has components given by (3.24). is a generalised inverse of A n .
  • Equation (3.16) can be rewritten using (3.17) and (3.18) as (3.27), which leads to (3.28).
  • the input to the control system is also sampled by an ADC. This is triggered by the signal T(t), as is the Digital to Analogue Converter (DAC) which converts the digital output from the control system into the analogue drive signals to the actuators.
  • the ADC can be common to both the control system and the signal processor which produces the
  • transform and inverse transform modules could also be common to both systems .
  • Any sensor failure will result in one row of the matrix A becoming close to zero, while an actuator failure will result in a column of A becoming small.
  • the system can monitor changes in the matrix A and identify and indicate failures in sensors or actuators. This is an important aid to system maintenance and repair.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Evolutionary Computation (AREA)
  • Medical Informatics (AREA)
  • Software Systems (AREA)
  • Feedback Control In General (AREA)

Abstract

Système de traitement des informations pour une installation, telle qu'un moteur ou une machine, sujette à des perturbations qui sont essentiellement périodiques et pour lesquels on dispose d'un signal (T(t)) qui est fonction de la période des perturbations. Dans ledit système, un convertisseur analogique-numérique, déclenché par le signal (T(t)), échantillonne la réponse de l'installation de manière à synchroniser la procédure d'échantillonnage avec les perturbations cycliques, et un dispositif de traitement évalue, à partir des signaux échantillonnés, les perturbations et par là la partie de l'installation dont les signaux de sortie sont fonction de signaux d'entrée inconnus (Fig. 2). L'évaluation des perturbations peut servir à actionner un système actif de commande anti-vibrations utilisé en combinaison avec le système d'échantillonnage.
EP19890912277 1988-10-26 1989-10-20 Dispositif de traitement de informations permettant d'identifier des systemes sujets a des perturbations periodiqus Withdrawn EP0440720A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888825074A GB8825074D0 (en) 1988-10-26 1988-10-26 Signal processing means for identifying systems subject to periodic disturbances
GB8825074 1988-10-26

Publications (1)

Publication Number Publication Date
EP0440720A1 true EP0440720A1 (fr) 1991-08-14

Family

ID=10645832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890912277 Withdrawn EP0440720A1 (fr) 1988-10-26 1989-10-20 Dispositif de traitement de informations permettant d'identifier des systemes sujets a des perturbations periodiqus

Country Status (6)

Country Link
EP (1) EP0440720A1 (fr)
JP (1) JPH04501476A (fr)
AU (1) AU4493389A (fr)
CA (1) CA2001199C (fr)
GB (1) GB8825074D0 (fr)
WO (1) WO1990004820A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289957A (en) * 1994-05-28 1995-12-06 British Aerospace Adaptive control systems
US5992383A (en) * 1996-05-28 1999-11-30 U.S. Philips Corporation Control unit having a disturbance predictor, a system controlled by such a control unit, an electrical actuator controlled by such a control unit, and throttle device provided with such an actuator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61234409A (ja) * 1985-04-10 1986-10-18 Hitachi Ltd 流量制御方式

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9004820A1 *

Also Published As

Publication number Publication date
WO1990004820A1 (fr) 1990-05-03
GB8825074D0 (en) 1988-11-30
CA2001199C (fr) 1998-08-11
AU4493389A (en) 1990-05-14
JPH04501476A (ja) 1992-03-12
CA2001199A1 (fr) 1990-04-26

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