A Moving-Average Method for Input Saturation Problem in Adaptive Control

Noguchi, T.; Kanai, Kazuaki; Hori, N.; Nikiforuk, P.N.; Gupta, Manan

doi:10.1016/s1474-6670(17)55502-0

Cited by 5 publications

(7 citation statements)

References 5 publications

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“…This control method was applied to the positioning control of an electrohydraulic servo system and a series of computer simulations were carried out. It is concluded that there is no significant improvement in performance over the earlier method (5) with regard to input saturation. There is, however, a difference in simplicity between the two controller structures which is attributed to the elimination of a certain filter in the design.…”

Section: Discussionmentioning

confidence: 69%

“…It can be seen from the above that, in the low frequency range, Re(o) is almost unity and Im(w) almost zero, which means that the gain is almost unity and the phase shift practically zero at low frequencies. For example, if a reference output ydkT) is of the step type, ydkT) converges to yM(kT) (5). A modification is proposed, however, to make the imaginary part exactly zero at all frequencies if y,(kT) is known a priori.…”

Section: Proof: Refer To Noguchi and Kanai (22)mentioning

confidence: 99%

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Prevention of Input Saturation in Adaptive Positioning Control of an Electrohydraulic Servo System

Ukrainetz

Nikiforuk

Hori

1989

Proceedings of the Institution of Mechanical Engineers, Part C:

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The paper deals with the adaptive positioning control of a single-input-single-output electrohydraulic servo system which employs an input filter. This filter spreads a large control input over a period of sampling instants to prevent input saturation. As well, its use enables the proof of stability to be achieved using the standard technique even for unstable plants. A controller structure, which does not require feedbackfrom the output of the inputfilter, is determined by considering the inputjlter to be a part ofthe unknown plant. The design is described in discrete-time form using the Euler operator which has better characteristics than the z operator in many respects.The simulation results are presented to show the performance of the controller.

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Section: Discussionmentioning

confidence: 69%

Section: Proof: Refer To Noguchi and Kanai (22)mentioning

confidence: 99%

Prevention of Input Saturation in Adaptive Positioning Control of an Electrohydraulic Servo System

Ukrainetz

Nikiforuk

Hori

1989

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…It is assumed that there exists a limitation on the control input, with M known, such that I Up (kT)<M< A stable proper reference model is given by (5) where r (kT ) is a reference input sequence which is uniformly bounded.…”

Section: Discrete-time Modelsmentioning

confidence: 99%

“…The input saturation can cause instability if the plant to be controlled adaptively is unstable or marginally stable, even if the adaptive system is stable when there is no saturation (5). A number of methods have been proposed, therefore, for controlling an unknown stable plant which has a limit in the input amplitude (6) to (8).…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, a simpler adaptive control scheme than that proposed in (5) is described in the discrete-time form using the Euler operator. The simplification is the result of eliminating the use of the output of the input filter which is needed in (5). This control scheme is applied to the positioning control of an electrohydraulic servo actuator and studied by computer simulations.…”

Section: Introductionmentioning

confidence: 99%

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Prevention of Input Saturation in Adaptive Positioning Control of an Electrohydraulic Servo System

Hori¹,

Ukrainetz²,

Nikiforuk

1989

Proceedings of the JFPS International Symposium on Fluid Power

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The paper deals with the adaptive positioning control of an electrohydraulic servo system which employs an input filter. This filter spreads a large control input over a period of sampling instants to prevent input saturation. As well, its use enables the proof of stability to be achieved using the standard technique even for unstable plants. A controller structure, which does not require feedback from the output of the input filter, is determined by considering the input filter to be a part of the unknown plant. The design is described in discrete-time form using the Euler operator which has better characteristics than the z operator in many respects. The simulation results are presented to show the performance of the controller.

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Robustly Stable, Discrete-Time, Adaptive Flight Control Using the Euler Operator

Hori

Kanai

Nikiforuk

1991

Automatic Control 1990

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A Moving-Average Method for Input Saturation Problem in Adaptive Control

Cited by 5 publications

References 5 publications

Prevention of Input Saturation in Adaptive Positioning Control of an Electrohydraulic Servo System

Prevention of Input Saturation in Adaptive Positioning Control of an Electrohydraulic Servo System

Prevention of Input Saturation in Adaptive Positioning Control of an Electrohydraulic Servo System

Robustly Stable, Discrete-Time, Adaptive Flight Control Using the Euler Operator

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