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Precise position control of an electro-hydraulic servo system via robust linear approximation.

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Title: Precise position control of an electro-hydraulic servo system via robust linear approximation.
Authors: Fallahi, M.1 mfalahi@aut.ac.ir, Zareinejad, M.2 mzare@aut.ac.ir, Baghestan, K.1 k_baghestan@aut.ac.ir, Tivay, A.1 alitivay@aut.ac.ir, Rezaei, S.M.1 smrezaei@aut.ac.ir, Abdullah, A.1 amirah@aut.ac.ir
Source: ISA Transactions. Sep2018, Vol. 80, p503-512. 10p.
Subjects: Electrohydrodynamics, Robust control, Approximation theory, Linear matrix inequalities, Uncertainty, Taylor's series
Abstract: Abstract This paper presents a study on electro-hydraulic servo system for the purpose of position control using a compatible linear model. The system has high level of nonlinearity and linearization introduces extra error in system model. In order to reduce this error several methods of linearization uncertainty are discussed. In spite of applying Taylor's series for all methods, several procedures are used for considering uncertainty on linearization constants. In the first procedure, a simple bound is considered for each linearization constant. In the second procedure, a polytope is extracted for the uncertainty by a graphical method. Finally, a procedure with less conservativeness and less restriction is proposed. This procedure is used to extract the linear model of the electro-hydraulic servo system for the task of position control. The resulting model is used to synthesize an output-feedback H ∞ controller for the EHSS using a Linear Matrix Inequality (LMI)-based approach. The effectiveness of the proposed method is demonstrated by simulation and experimental results. The results showed that the procedure is less conservative and has the fastest operation without any overshoot. Highlights • The Electro-Hydraulic Servo System has high level of nonlinearity and linearization introduces extra error in system model. • A less conservative and less restrictive procedure is proposed for linearizing systems with high level of nonlinearity. • Polytopic linearization uncertainty with a robust H ∞ controller is used to address the linearization error. • The effectiveness of the proposed method is demonstrated by simulation and experimental results. • The results showed that the procedure has the fastest operation without any overshoot in comparison with the other procedures. [ABSTRACT FROM AUTHOR]
Copyright of ISA Transactions is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 131945383
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PubType: Academic Journal
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  Data: Precise position control of an electro-hydraulic servo system via robust linear approximation.
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  Data: <searchLink fieldCode="AR" term="%22Fallahi%2C+M%2E%22">Fallahi, M.</searchLink><relatesTo>1</relatesTo><i> mfalahi@aut.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Zareinejad%2C+M%2E%22">Zareinejad, M.</searchLink><relatesTo>2</relatesTo><i> mzare@aut.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Baghestan%2C+K%2E%22">Baghestan, K.</searchLink><relatesTo>1</relatesTo><i> k_baghestan@aut.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Tivay%2C+A%2E%22">Tivay, A.</searchLink><relatesTo>1</relatesTo><i> alitivay@aut.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Rezaei%2C+S%2EM%2E%22">Rezaei, S.M.</searchLink><relatesTo>1</relatesTo><i> smrezaei@aut.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Abdullah%2C+A%2E%22">Abdullah, A.</searchLink><relatesTo>1</relatesTo><i> amirah@aut.ac.ir</i>
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  Data: <searchLink fieldCode="JN" term="%22ISA+Transactions%22">ISA Transactions</searchLink>. Sep2018, Vol. 80, p503-512. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Electrohydrodynamics%22">Electrohydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Robust+control%22">Robust control</searchLink><br /><searchLink fieldCode="DE" term="%22Approximation+theory%22">Approximation theory</searchLink><br /><searchLink fieldCode="DE" term="%22Linear+matrix+inequalities%22">Linear matrix inequalities</searchLink><br /><searchLink fieldCode="DE" term="%22Uncertainty%22">Uncertainty</searchLink><br /><searchLink fieldCode="DE" term="%22Taylor's+series%22">Taylor's series</searchLink>
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  Data: Abstract This paper presents a study on electro-hydraulic servo system for the purpose of position control using a compatible linear model. The system has high level of nonlinearity and linearization introduces extra error in system model. In order to reduce this error several methods of linearization uncertainty are discussed. In spite of applying Taylor's series for all methods, several procedures are used for considering uncertainty on linearization constants. In the first procedure, a simple bound is considered for each linearization constant. In the second procedure, a polytope is extracted for the uncertainty by a graphical method. Finally, a procedure with less conservativeness and less restriction is proposed. This procedure is used to extract the linear model of the electro-hydraulic servo system for the task of position control. The resulting model is used to synthesize an output-feedback H ∞ controller for the EHSS using a Linear Matrix Inequality (LMI)-based approach. The effectiveness of the proposed method is demonstrated by simulation and experimental results. The results showed that the procedure is less conservative and has the fastest operation without any overshoot. Highlights • The Electro-Hydraulic Servo System has high level of nonlinearity and linearization introduces extra error in system model. • A less conservative and less restrictive procedure is proposed for linearizing systems with high level of nonlinearity. • Polytopic linearization uncertainty with a robust H ∞ controller is used to address the linearization error. • The effectiveness of the proposed method is demonstrated by simulation and experimental results. • The results showed that the procedure has the fastest operation without any overshoot in comparison with the other procedures. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of ISA Transactions is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1016/j.isatra.2018.06.002
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        Text: English
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      – SubjectFull: Electrohydrodynamics
        Type: general
      – SubjectFull: Robust control
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      – SubjectFull: Approximation theory
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      – SubjectFull: Linear matrix inequalities
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      – SubjectFull: Uncertainty
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      – SubjectFull: Taylor's series
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      – TitleFull: Precise position control of an electro-hydraulic servo system via robust linear approximation.
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              M: 09
              Text: Sep2018
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              Y: 2018
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