Target feedback loop/loop transfer recovery (TFL/LTR) robust control design procedures

Prakash, R.

doi:10.1109/cdc.1990.203799

Cited by 21 publications

(14 citation statements)

References 12 publications

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“…Thus one can envision the use of the family of TFL/LTR methods [5] or H∞ norm based methods [3] involving requirements in terms of loop sensitivity S= (I+ GR) -1 and the complementary sensitivity T= (I+ GR) -1 GR. Because of (1), these design methods will adequately address stability and disturbance (and also measurement noise) rejection requirements.…”

Section: Loop Controller Designmentioning

confidence: 99%

“…To calculate the loop controller R, the TFL / LTR approach ( [5], [6]) was used. A brief review of the approach follows.…”

Section: Block R -Controllermentioning

confidence: 99%

“…Furthermore, association of 978-1-5090-1613-6/17/$31.00 ©2017 IEEE the second design step with robust control design methods such as H∞ and TFL/LTR (generalization of the LQG/LTR approach) may result in excellent disturbance and noise rejecting loops, as well as possible tolerance of sensor or actuator loss under certain conditions [5].…”

Section: Introductionmentioning

confidence: 99%

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New insights for applications of Kreisselmeier's structure in robust and fault tolerant control

Kienitz

Kadirkamanathan

2017

2017 IEEE Aerospace Conference

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-This paper addresses a two degree of freedom structure discussed by Kreisselmeier for the SISO case in 1999. The discussion herein considers a MIMO setting, and aims at the use of this control topology for robust and fault tolerant control. It is also shown how design barriers can be obtained for robust I/O transfer behavior assignment and robustness evaluation schemes can be devised which allow for the quantitative valuation of I/O transfer behavior degradation in the presence of plant model uncertainty. The concepts and techniques are illustrated and assessed using an in-flight simulation problem.

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Section: Loop Controller Designmentioning

confidence: 99%

“…To calculate the loop controller R, the TFL / LTR approach ( [5], [6]) was used. A brief review of the approach follows.…”

Section: Block R -Controllermentioning

confidence: 99%

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New insights for applications of Kreisselmeier's structure in robust and fault tolerant control

Kienitz

Kadirkamanathan

2017

2017 IEEE Aerospace Conference

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“…The TFL/LTR approach for designing a robust controller falls under a broader category of procedures in which the robustness is ensured by certain loop properties (Prakash, 1990). It consists of two sequential steps, namely, TFL design, characterized by calculation of the constant TFL-gain matrix, K f , that specifies stability and robustness performance, and the LTR step, with the determination of the constant LTR gain matrix, K r , to recover the loop transfer.…”

Section: Tfl/ltr Methods and Specificationsmentioning

confidence: 99%

“…Guaranteed multivariable margins of ALQR can be established when used in state feedback regulator loops, they correspond to the gain/phase perturbation, that can be considered in all the outputs simultaneously or in an independent manner (Prakash, 1990). These guaranteed multi-variable margins are given by:…”

Section: Ltr Step -Amplified Linear Quadratic Regulatormentioning

confidence: 99%

An experimental evaluation of TFL/LTR controllers against actuator failure and time delay applied in a 3dof helicopter

Hemmann¹,

Pereira²,

Kienitz³

2013

Proceeding Series of the Brazilian Society of Computational and Applied Mathematics

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Abstract-This paper presents an application of robust controllers in a laboratory helicopter system. The controllers were designed using the TFL/LTR (Target Feedback Loop/Loop Transfer Recovery) technique with amplified linear quadratic regulation (ALQR). The purpose of the designed control system is to solve the problem of tracking reference trajectories ensuring performance and stability in spite of motor power loss and time delay at the input of the plant. The laboratory helicopter is a nonlinear system, but it's dynamic is approximated by a 6 th order linear model. The helicopter attitude is described by three angles: travel φ, elevation ψ and pitch θ. Experimental results obtained with the robust controllers in the presence of actuator failure and time delays are presented.Keywords-Robust control, TFL/LTR controllers, 3DOF helicopter, Actuator failure, Time delay.Resumo-Este artigo apresenta a aplicação de controladores robustos em um helicóptero de laboratório. Os controladores foram projetados usando a técnica TFL/LTR (Target Feedback Loop/Loop Transfer Recovery) com regulação linear quadrática amplificada (ALQR). A proposta consiste em resolver o problema de rastreamento de trajetórias de referência, garantindo desempenho e estabilidade apesar de perda de potência dos motores e atrasos na entrada da planta. A dinâmica da plantaé descrita por um modelo linearizado de 6 a ordem. Os três graus de liberdade são: deslocamento φ, elevação ψ e arfagem θ. Resultados experimentais são apresentados usando os controladores robustos quando submetidosà falhas nos atuadores e atrasos.

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Robust Controllers Using Generalizations of the LQG/LTR Method

Pereira

Kienitz

2014

J Control Autom Electr Syst

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Target feedback loop/loop transfer recovery (TFL/LTR) robust control design procedures

Cited by 21 publications

References 12 publications

New insights for applications of Kreisselmeier's structure in robust and fault tolerant control

New insights for applications of Kreisselmeier's structure in robust and fault tolerant control

An experimental evaluation of TFL/LTR controllers against actuator failure and time delay applied in a 3dof helicopter

Robust Controllers Using Generalizations of the LQG/LTR Method

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