• Title, Summary, Keyword: gain-scheduling

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Performance Verification of the Modified Gain Scheduling Controller by Speed Control of a DC Motor (DC 모터 제어를 통한 개선된 게인 스케줄링 제어기의 성능 검증)

  • Cheon, Min-Kyu;Park, Mig-Non;Hyun, Chang-Ho;Lee, Hee-Jin
    • Proceedings of the KIEE Conference
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    • pp.312-314
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    • 2006
  • This paper describes performance of the modified gain scheduling controller by speed control of a DC motor. The modified gain scheduling controller can perform tracking at more than one equilibrium points. The modified gain scheduling controller which considers transient response according to added zero shows better result of tracking performance than the unmodified gain scheduling controller shows.

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Tower Load Reduction Control by Pitch Loop Individual Gain Scheduling (피치 루프 개별 게인 스케줄링 기법을 통한 타워 하중 저감 제어)

  • Kim, Cheol-Jin;Kim, Kwansu;Song, Yuan;Paek, Insu
    • Journal of Wind Energy
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    • v.9 no.3
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    • pp.25-32
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    • 2018
  • This paper deals with the National Renewable Energy Laboratory (NREL) 5 MW reference wind turbine for offshore systems. The controller, which includes Maximum Power Point Tracking (MPPT) control to recover the maximum energy from wind and pitch control to limit the power output, is applied to wind turbines. Conventional pitch loops have used the same sensitivity scheduling to the P gain signal and I gain signal (Collective Pitch gain Scheduling, or CPS). However, this technique only focuses on power control without considering the load on the wind turbine. In addition, the stability of the system cannot be guaranteed since the pitch control loop has a low phase margin. Therefore, this paper proposes a technique that applies gain scheduling individually to the P gain signal and the I gain signal (Individual Pitch gain Scheduling, or IPS) for load reduction. To verify the effect, electrical power and tower root moment damage equivalent load (DEL) were set as performance indices. Simulations were performed for 600 seconds under the wind conditions of the normal turbulence model, with turbulence intensity of 16 % and wind speeds of 12~25 m/s. The proposed IPS technique was found to reduce the fore-aft moment DEL of the tower by up to 14.49 % more than the existing collective pitch scheduling.

Comparison Study of Nonlinear CSAS Flight Control Law Design Using Dynamic Model Inversion and Classical Gain Scheduling (항공기 CSAS 설계를 위한 고전적 Gain Scheduling 기법과 Dynamic Model Inversion 비선형 기법의 비교 연구)

  • Ha, Cheol-Geun;Im, Sang-Su;Kim, Byeong-Su
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.7
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    • pp.574-581
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    • 2001
  • In this paper we design and evaluate the longitudinal nonlinear N(aub)z-CSAS(Command and Stability Augmentation System) flight control law in \"DMI(Dynamic Model Inversion)-method\" and classical \"Gain Scheduling-method\", respectively, to meet the handling quality requirements associated with push-over pull-up maneuver. It is told that the flight control law designed in \"DM-method\" is adequate to the full flight regime without gain scheduling and is efficient to produce the time response shape desired to the handling quality requirements. On the contrary, the flight control law designed in \"Gain Scheduling-method\" is easy to be implemented in flight control computer and insensitive to variation of the actuator model characteristics.n of the actuator model characteristics.

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An Effect of Pitch Gain-Scheduling on Shaft Vibration Response of Wind Turbine (풍력터빈 축 진동 응답에 대한 피치 게인-스케쥴링의 효과)

  • Lim, Chae-Wook;Jo, Jun-Chul
    • The KSFM Journal of Fluid Machinery
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    • v.15 no.2
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    • pp.36-40
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    • 2012
  • Pitch control of wind turbine is activated above rated wind speed for the purpose of rated power regulation. When we design pitch controller, its gain-scheduling is essential due to nonlinear characteristics of aerodynamic torque. In this study, 2-mass model including a vibration mode of drive-train for a 2 MW wind turbine is considered and pitch control with gain-scheduling using a linearization analysis of the nonlinear aerodynamic torque is applied. Some simulation results for the pitch gain-scheduling under step wind speed are presented and investigated. It is shown that gain-scheduling in pitch control is important especially in the region of high wind speeds when there exists a vibration mode of drive-train.

A Study on Gain Scheduling Programming with the Fuzzy Logic Controller of a 6-axis Articulated Robot using LabVIEW® (LabVIEW®를 이용한 6축 수직 다관절 로봇의 퍼지 로직이 적용된 게인 스케줄링 프로그래밍에 관한 연구)

  • Kang, Seok-Jeong;Chung, Won-Jee;Park, Seung-Kyu;Noe, Sung Hun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.4
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    • pp.113-118
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    • 2017
  • As the demand for industrial robots and Automated Guided Vehicles (AGVs) increases, higher performance is also required from them. Fuzzy controllers, as part of an intelligent control system, are a direct control method that leverages human knowledge and experience to easily control highly nonlinear, uncertain, and complex systems. This paper uses a $LabVIEW^{(R)}-based$ fuzzy controller with gain scheduling to demonstrate better performance than one could obtain with a fuzzy controller alone. First, the work area was set based on forward kinematics and inverse kinematics programs. Next, $LabVIEW^{(R)}$ was used to configure the fuzzy controller and perform the gain scheduling. Finally, the proposed fuzzy gain scheduling controller was compared with to controllers without gain scheduling.

Model-based Gain Scheduling Strategy for Air-to-fuel Ratio Control Algorithm of Passenger Car Diesel Engines (승용디젤엔진의 공연비 제어 알고리즘을 위한 모델기반 게인 스케줄링 전략에 대한 연구)

  • Park, Inseok;Hong, Seungwoo;Sunwoo, Myoungho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.1
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    • pp.56-64
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    • 2015
  • This study presents a model-based gain scheduling strategy for PI-based EGR controllers. The air-to-fuel ratio is used as an indirect measurement of the EGR rate. In order to cope with the nonlinearity and parameter varying characteristics of the EGR system, we proposed a static gain model of the EGR system using a new scheduling parameter. With the 810 steady-state measurements, the static gain model achieved 0.94 of R-squared value. Based on the static gain of the EGR system, the PI gains were robustly designed using quantitative feedback theory. Consequently, the gains of the PI controller are scheduled according to the static gain parameter of the EGR path in runtime. The proposed model-based gain scheduling strategy was validated through various operating conditions of engine experiments such as setpoint step responses and disturbance rejections.

Depth Controller Design using Fuzzy Gain Scheduling Method of a Autonomous Underwater Vehicle - Verification by HILS (퍼지 이득 스케쥴링 기법을 이용한 무인 잠수정의 심도제어기 설계 - HILS 검증)

  • Hwang, Jong-Hyon;Park, Sewon;Kim, Moon-Hwan;Lee, Sang-Young;Hong, Sung Kyung
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.9
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    • pp.791-796
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    • 2013
  • This paper proposes a fuzzy logic gain scheduling method for depth controller of the AUV (Autonomous Underwater Vehicle). Gains of depth controller are calculated by using multi-loop root locus technique. Fuzzy logic based gain scheduling approach is used to modify multi-loop gains as control condition. It is illustrated by simulations that the proposed fuzzy logic gain scheduling method yields smaller rising time and overshoot compared to the fixed-gain controller. Finally, being implemented on real hardwares, all the proposed algorithms are validated with integrations of hardware and software altogether by HILS.

FUZZY Logic-Based Fast Gain Scheduling Control Using Fuzzy Preprocessor

  • Lee, Seon-Ho;Kim, Sung-Gyu;Zeungnam Bien
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • pp.73-76
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    • 1997
  • This paper proposes the fuzzy logic-based fast gain scheduling(FFGS) controller for regulation problem in nonlinear systems. It utilizes which reflects the derivative information on the original scheduling variable in order to achieve better performance than the existents. Moreover, we apply the proposed control scheme to control active suspension systems with nonlinear components.

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Gain scheduled control of magnetic suspension system

  • Kim, Young-Chol;Ryu, Seung-Ki;ryu, Jeong-Woong
    • 제어로봇시스템학회:학술대회논문집
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    • pp.321-326
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    • 1993
  • A gain scheduling approach for the suspension control of a nonlinear MAGLEV System is presented. We show that this technique is ver useful for improving not only performance to the operational disturbances originating aerodynamic force but also robustness to the uncertainty of payload. As a scheduling variable, even though the external disturbance need to be estimated in real time, but the additive measurement is not required to do it. Some simulations show that the gain scheduling control system performs very well comparing with other method using a nonlinear feedback linearization or a fixed gain linear feedback.

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Fuzzy Estimator for Gain Scheduling and its Appliation to Magnetic Suspension

  • Lee, Seon-Ho;Lim, Jong-Tae
    • Transactions on Control, Automation and Systems Engineering
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    • v.3 no.2
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    • pp.106-110
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    • 2001
  • The external force disturbance is the one of the main causes that deteriorate the performance of the magnetic suspension. Thus, this paper develops a fuzzy estimator for gain scheduling control of magnetic suspension system suffering from the unknown disturbance. The propose fuzzy estimator computes the disturbance injected to the plant the gain scheduled controller generates the corresponding stabilizing control input associated with estimated disturbance. In the simulation results we confirm the novelty of the proposed control scheme comparing with the other method using a feedback linearization.

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