Practical evaluation of a novel multivariable relay autotuner with short and efficient excitation

Berner, Josefin; Soltesz, Kristian; Åström, Karl Johan; Hägglund, Tore

doi:10.1109/ccta.2017.8062671

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…The step-test-based identification was firstly illustrated by Wang et al (2000), but applicable with decouplers. A relay feedback technique and variances in the relay with the type of tests are shown in studies (Bajarangbali and Majhi, 2012;Berner et al, 2017aBerner et al, , 2017bKalpana et al, 2015;Mehta and Majhi, 2011;Nema and Padhy, 2015;Semino and Scali, 1998). The improved frequency-domain identification technique for MIMO processes was described first by Semino and Scali (1998), who utilized a two-step strategy.…”

Section: Introductionmentioning

confidence: 99%

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A single-step identification strategy for the coupled TITO process using fractional calculus

Kothari

Mehta

Prasad

2021

Transactions of the Institute of Measurement and Control

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The reliable performance of a complete control system depends on accurate model information being used to represent each subsystem. The identification and modelling of multivariable systems are complex and challenging due to cross-coupling. Such a system may require multiple steps and decentralized testing to obtain full system models effectively. In this paper, a direct identification strategy is proposed for the coupled two-input two-output (TITO) system with measurable input–output signals. A well-known closed-loop relay test is utilized to generate a set of inputs–outputs data from a single run. Based on the collected data, four individual fractional-order transfer functions, two for main paths and two for cross-paths, are estimated from single-run test signals. The orthogonal series-based algebraic approach is adopted, namely the Haar wavelet operational matrix, to handle the fractional derivatives of the signal in a simple manner. A single-step strategy yields faster identification with accurate estimation. The simulation and experimental studies depict the efficiency and applicability of the proposed identification technique. The demonstrated results on the twin rotor multiple-input multiple-output (MIMO) system (TRMS) clearly reveal that the presented idea works well with the highly coupled system even in the presence of measurement noise.

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Section: Introductionmentioning

confidence: 99%

“…However, this method did not use controllers in loops. Authors have evaluated practically a relay autotuner with short excitation on a quadruple-tank setup (Berner et al, 2017b). Besides the relay test, some alternative techniques have been reported to identify TITO processes.…”

Section: Introductionmentioning

confidence: 99%

A single-step identification strategy for the coupled TITO process using fractional calculus

Kothari

Mehta

Prasad

2021

Transactions of the Institute of Measurement and Control

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Fractional-order two-input two-output process identification based on Haar operational matrix

Kothari

Mehta

2020

International Journal of Systems Science

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The identification of multi-input-multi-output process is always challenging due to significant loop interactions. This article proposes an identification technique for two-input-two-output processes with fractional order models via Haar wavelet feature. The presented technique can estimate independent four fractional single-pole time delay models without additional steps to decouple processes during identification. The method uses a well-known relay feedback test to produce the input-output data for measurements. Then, the Haar wavelet operational matrix based algebraic approach is utilised to identify the unknown process models with reduced complexity. Numerical analysis on various examples show the efficacy even in presence of noise and without additional filter or preprocessing of measured signals. The comparative study proves advantages of the presented approach.

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Optimal error governor for PID controllers

Cavanini

Ferracuti

Monteriù

2021

International Journal of Systems Science

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Practical evaluation of a novel multivariable relay autotuner with short and efficient excitation

Cited by 3 publications

References 16 publications

A single-step identification strategy for the coupled TITO process using fractional calculus

A single-step identification strategy for the coupled TITO process using fractional calculus

Fractional-order two-input two-output process identification based on Haar operational matrix

Optimal error governor for PID controllers

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