• Title/Summary/Keyword: Closed loop control

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유전 알고리듬을 이용한 최적의 룰 맵핑을 가지는 퍼지 제어기 설계 (A Design of Fuzzy Controller with Optimal Rule Using Genetic Algorithm)

  • 이영석;김성식;서보혁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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    • pp.68-70
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    • 1996
  • A fuzzy network using genetic algorithm is investigated in the context of control for finite dimensional nonlinear discrete systems. The proposed FN(Fuzzy Network) constructed to identify various parameter of fuzzy control is used for the nonlinear system control. Each of two FN, presented FN control system is based on a framework of closed loop control. A proposed FNN model trains using the modeling error and the closed loop error. That case study shows that the presented FN model and closed loop control system is very useful in practical sense.

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압력손실을 고려한 양돈시설의 반폐회로 환기시스템의 환기량 및 혼합비율 평가 (Evaluation of Ventilation Rate and External Air Mixing Ratio in Semi-closed Loop Ventilation System of Pig House Considering Pressure Loss)

  • 박유미;김락우;김준규
    • 한국농공학회논문집
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    • 제65권1호
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    • pp.61-72
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    • 2023
  • The increase in the rearing intensity of pigs has caused deterioration in the pig house's internal environment such as temperature, humidity, ammonia gas, and so on. Traditionally, the widely used method to control the internal environment was through the manipulation of the ventilation system. However, the conventional ventilation system had a limitation to control the internal environment, prevent livestock disease, save energy, and reduce odor emission. To overcome this problem, the air-recirculated ventilation system was suggested. This system has a semi-closed loop ventilation type. For designing this system, it was essential to evaluate the ventilation rates considering the pressure loss of ducts. Therefore, in this study, pressure loss calculation and experiment were conducted for the quantitative ventilation design of a semi-closed loop system. The results of the experiment showed that the inlet through which external air flows should always be opened. In addition, it was also found that for the optimum design of the semi-closed loop ventilation system, it was appropriate to install a damper or a backflow prevention device rather than a ventilation fan.

다중 시간지연 공정을 위한 개선된 다중루프 PI 제어기 설계 (Design of Advanced Multi-loop PI Controller for Multi-delay Processes)

  • 트롱부;이문용
    • 제어로봇시스템학회논문지
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    • 제16권1호
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    • pp.77-82
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    • 2010
  • An analytical method for robust design of the multi-loop proportional-integral (PI) controller is proposed for various types of multi-delay processes. On the basis of the direct synthesis and generalized IMC-PID approach, the analytical tuning rules of the multi-loop PI controller are firstly derived for achieving the desired closed-loop response, and the structured singular value synthesis is then utilized for the tradeoffs between the robust stability and performance by adjusting only one design parameter (i.e., the closed-loop time constant). To verify the superiority of the proposed method, the simulation studies have been conducted on a wide variety of multivariable processes. The multi-loop PI controller designed by the proposed method shows a fast, well-balanced and robust response with the minimum integral absolute error (IAE) in compared with other renowned methods.

BLDC 모터의 관측자를 이용한 강인 제어 (Robust Control using Observer for Brushless DC Motor)

  • 유병삼;신두진;박익동;허욱열
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 추계학술대회 논문집 학회본부 B
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    • pp.552-554
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    • 1999
  • In this paper, a robust control system with the disturbance observer is proposed for BLDC servo system. The overall control system consists of the speed controller which is implemented with PI controller and the disturbance observer with free parameters. The proposed control system is designed the command input response and the closed loop characteristics independently by using two-degrees-of-freedom concept, so it can improve the closed loop characteristics with no influence on the command input response. The effective suppression of disturbance with the observer improves the characteristics of the closed loop of the system. And also, by fluting the bandwidth of free parameters, measurement noise is considered. To verify the better performance of the proposed control system than that of the conventional PI controllers, the performance of the controller is analyzed theoretically and some simulation results are presented.

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시변 페이딩 채널하에 CDMA 시스템을 위한 예측 폐루프 전력제어 (Predictive Closed-Loop Power Control for CDMA Systems in Time-Varying Fading Channels)

  • 최상호
    • 한국통신학회논문지
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    • 제30권11A호
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    • pp.1021-1026
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    • 2005
  • 본 논문에서는 시변 페이딩 채별에 적합한 멀터스텝 LS 선형예측기를 갖는 새로운 예측 CDMA 폐루프 전력 제어 방식을 제안한다. 제안된 방식은 다중 전력 제어 그룹 지연을 효과적으로 보상하여 주며 단일 스텝 예측기를 갖는 기존의 예측 CLPC 방식이나 비예측 CLPC 방식에 비하여 우수한 성능 이득을 갖는다.

독립된 모달공간에서 양 위치피드백 제어기법의 강인성 (Robustness of Positive Position Feedback Control in the Independent Modal Space)

  • 황재혁;백승호
    • 소음진동
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    • 제4권2호
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    • pp.177-185
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    • 1994
  • In this study, the effect of parameter errors on the closed-loop behavior of flexible structure is analyzed for IMSC(Independent Modal Space Control) with PPF(Positive Position Feedback). If the control force designed on the basis of structure model with the parameter errors is applied to control the actual system, the closed-loop performance of the actural system will be degraded depending on the degree of the errors. An asymptotic stability condition has been derived, using Lyapunov approach, which is independent of the dynamic characteristics of the structure being controlled. The extent of deviation of the closed-loop performance from the designed one is also derived and evaluated using operator techniques. It has been found that the extent of the deviation is proportational to the magnitude of the parameter errors, and that the proportional coefficient depends on the control algorithm.

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유도전동기 센서리스 벡터제어를 위한 고피나스 자속관측기의 P/PI 모드 전환 (The P/PI Mode Switching Method of Gopinath Flux Observer for Sensorless Vector Control of Induction Motors)

  • 강명규;최종우
    • 전기학회논문지
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    • 제66권12호
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    • pp.1732-1739
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    • 2017
  • This paper presents a sensorless vector control algorithm of closed loop Gopinath flux observer to enhance the robustness at low speed by switching P/PI mode. Closed loop Gopinath flux observer has the problem in sensorless vector control of induction motor at low speed. This paper solves the problem using the characteristic function of closed loop Gopinath flux observer. P mode shows better performance than PI mode under the cut-off frequency of observer. But P mode always has a flux error due to DC offset, so this paper combines P mode and PI mode. This algorithm shows good performance over wide speed range. The performance has been confirmed through computer simulations using MATLAB SIMULINK and experiments.

Data-based Stability Analysis for MIMO Linear Time-invariant Discrete-time Systems

  • Park, Un-Sik;Ikeda, Masao
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2005년도 ICCAS
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    • pp.680-684
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    • 2005
  • This paper presents a data-based stability analysis of a MIMO linear time-invariant discrete-time system, as an extension of the previous results for a SISO system. In the MIMO case, a similar discussion as in the case of a SISO system is also applied, except that an augmented input and output space is considered whose dimension is determined in relation to both the orders of the input and output vectors and the numbers of inputs and outputs. As certain subspaces of the input and output space, both output data space and closed-loop data space are defined, which contain all the behaviors of a system, respectively, with zero input in open-loop and with a control input in closed-loop. Then, we can derive the data-based stability conditions, in which the open-loop stability can be checked by using a data matrix whose column vectors span the output data space and the closed-loop stability can also be checked by using a data matrix whose column vectors span the closed-loop data space.

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Variable Structure Control for Discrete-time Nonlinear Systems

  • Han, So-Hee;Cho, Byung-Sun;Park, Kang-Bak
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2003년도 ICCAS
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    • pp.1414-1417
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    • 2003
  • In this paper, sliding mode controller for discrete-time nonlinear systems with uncertainties and disturbances are proposed. The concept of time-delay control (TDC) which consists of estimating the uncertain dynamics of the system through past observations of the system response is used. The proposed controller guarantees that the closed-loop system states are globally uniformly ultimately bounded (GUUB). It is also shown that the closed-loop system states are globally uniformly asymptotically stable (GUAS) if uncertainties are constant.

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민감도 함수의 최대치 제어를 통한 강인제어 (Robust Control via Peak Control of Sensitivity Function)

  • 서상민
    • 제어로봇시스템학회논문지
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    • 제15권11호
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    • pp.1071-1075
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    • 2009
  • This article describes a robust control method by using peak control of a sensitivity function in the state-feedback control systems. This method apparently reduces the peak, and as a result makes closed loop systems more stable. The designed closed loop systems also make the response to an external step disturbance more fast with a lower undershoot. At the conclusion, it is verified that the proposed method enhances robust stability and robust performance to parametric uncertainties through $\mu$-plot.