• 제목/요약/키워드: Periodic disturbance

검색결과 109건 처리시간 0.042초

CNC 공작 기계의 정밀 절삭을 위한 주기적 외란 보상 (Periodic disturbance compensation for precision cutting in CNC machining center)

  • 최종호;임혁;최병갑
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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    • pp.24-27
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    • 1997
  • A periodic disturbance canceler is proposed to compensate the periodic disturbance due to cutting process in a CNC machining center. For precision cutting, the combination of a disturbance observer and a periodic disturbance canceler is desirable in order to compensate both the frictional force and the periodic disturbance. This method is implemented in a position control system of a CNC machining center in cutting process and the experimental results are described to show its effectiveness.

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절삭 가공시 발생하는 주기적 외란의 제거 (Periodic Disturbance Cancelling without Phase Delay in Cutting Process)

  • 임혁;최종호;최병갑
    • 제어로봇시스템학회논문지
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    • 제5권7호
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    • pp.800-807
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    • 1999
  • A Periodic disturbance canceller is proposed to compensate for the periodic disturbance due to cutting process in a CNC machining center. The periodic disturbance canceller estimates the Periodic disturbance without phase delay. This is achieved by using linear phase low-pass filter and frequency response reciprocal filter of plant at the frequency of the periodic disturbance. This method is implemented in the position control system of the CNC machining center with general disturbance compensators in order to compensate for both the frictional force and the periodic disturbance. The experimental results are described to show its effectiveness.

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주기적 확률외란을 갖는 DC 전동기의 적응형 상태궤환 제어시스템 (Adaptive State Feedback Control System of DC Motors with Periodic Random Disturbance)

  • 정상철;김준수;조현철;이형기
    • 전기학회논문지
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    • 제57권6호
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    • pp.1036-1041
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    • 2008
  • Periodic disturbance is practically occurred in several engineering applications, especially in data storage systems. However, recently addressed controls for such problem were mostly dealt with its deterministic nature, which is rarely practical in real-time implementation. We present an adaptive control approach for DC motor systems with periodic stochastic disturbance whose frequency and magnitude are both random variables. We establish adaptive state feedback control which is linearly composed of nominal and corrective control parameter matrices. The former is derived from a nominal system model voiding disturbance and the latter is constructed from a disturbed system model by using Lyapunov stability theory. We carry out computer simulation to evaluate the proposed control methodology and compare to the recently addressed control method to demonstrate its superiority.

System and Disturbance Identification for Model-Based learning and Repetitive Control

  • 이수철
    • 한국산업정보학회:학술대회논문집
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    • 한국산업정보학회 2001년도 춘계학술대회논문집:21세기 신지식정보의 창출
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    • pp.145-151
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    • 2001
  • An extension of interaction matrix formulation to the problem of system and disturbance identification for a plant that is corrupter by both process and output disturbances is presented. With only an assumed upper bound on the order of the system and an assumed upper bound on the number of disturbance frequencies, it is shown that both the disturbance-free model and disturbance effect can be recovered exactly from disturbance-corrupted input-output data without direct measurement of the periodic disturbances. The rich information returned by the identification can be used by a performance-oriented model-based loaming or repetitive control system to eliminate unwanted periodic disturbances.

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트랙 추종 서보 시스템에 대한 주기적 외란 보상기의 이득 설정과 구현 (Design and Implementation of Periodic Disturbance Compensators for Track Following Servo Systems)

  • 정준
    • 한국소음진동공학회논문집
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    • 제24권2호
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    • pp.139-145
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    • 2014
  • Periodic disturbance compensators are widely used in track following servo systems. They are commonly designed and implemented by adaptive feedforward compensators or internal model based compensators. In track following servo systems, the gains of the compensators should be determined considering the change of the sensitivity transfer function and the implementation methods should be selected considering the system environment. This paper proposes a guide for determining gains of the periodic disturbance compensators. Various simulation and experimental results are presented to see the effect of gains. In addition, this paper introduces the various types of implementation methods and compares their merits and demerits.

주기적 외란을 수반하는 시스템의 적응 신경망 회로 기법에 의한 오차 제거 (Error elimination for systems with periodic disturbances using adaptive neural-network technique)

  • 김한중;박종구
    • 제어로봇시스템학회논문지
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    • 제5권8호
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    • pp.898-906
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    • 1999
  • A control structure is introduced for the purpose of rejecting periodic (or repetitive) disturbances on a tracking system. The objective of the proposed structure is to drive the output of the system to the reference input that will result in perfect following without any changing the inner configuration of the system. The structure includes an adaptation block which learns the dynamics of the periodic disturbance and forces the interferences, caused by disturbances, on the output of the system to be reduced. Since the control structure acquires the dynamics of the disturbance by on-line adaptation, it is possible to generate control signals that reject any slowly varying time-periodic disturbance provided that its amplitude is bounded. The artificial neural network is adopted as the adaptation block. The adaptation is done at an on-line process. For this , the real-time recurrent learning (RTRL) algoritnm is applied to the training of the artificial neural network.

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주기적 외란의 제거를 위한 빠른 오프라인 학습 제어 (A Fast Off-line Learning Approach to the Rejection of Periodic Disturbances)

  • 장정국;김남국;이호성
    • 정보저장시스템학회논문집
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    • 제3권4호
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    • pp.167-172
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    • 2007
  • The recently-developed off-line learning control approaches for the rejection of periodic disturbances utilize the specific property that the learning system tends to oscillate in steady state. Unfortunately, the prior works have not clarified how closely the learning system should approach the steady state to achieve the rejection of periodic disturbances to satisfactory level. In this paper, we address this issue extensively for the class of linear systems. We also attempt to remove the effect of other aperiodic disturbances on the rejection of the periodic disturbances effectively. In fact, the proposed learning control algorithm can provide very fast convergence performance in the presence of aperiodic disturbance. The effectiveness and practicality of our work is demonstrated through mathematical performance analysis as well as various simulation results.

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디스크 드라이브의 주기적 외란 고속 보상 제어 (Fast Compensator of Periodic Disturbance in Disk Drives)

  • 부찬혁;김호찬;강창익
    • 제어로봇시스템학회논문지
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    • 제10권2호
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    • pp.153-163
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    • 2004
  • The control objective in hard disk drives is to move head as fast as possible to target track and position the head over the center of target track in the presence of external disturbances. The external shock or disk clamping error in manufacturing process causes the disk center to deviate from the disk rotation center. The disk shift acts on the control system as disturbance and degrades severely the performance of disk drives. In this paper, we present a new controller that compensates for the periodic disturbances very fast. The disturbance compensator is arranged in parallel with the state feedback controller. To avoid the interference with the state feedback controller, the compensator creates compensation signal without the feedback of system output until steady state. The pulse type controller is included additionally for improving the transient performance due to initial state. Finally, in order to demonstrate the superior performance of the proposed compensator. we present some experimental results using a commercially available disk drive.

주기적 형태의 외란이 가해지는 위성체에 대한 선형최적제어기 설계 (Design of satellite attitude control system under periodic-type disturbances)

  • 김희섭;김유단
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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    • pp.1326-1329
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    • 1997
  • In designing the controller by changing the weighting matrix for the pirpose of satisfying constraints, the physical meaning of weighting matrix may disapperar and the system may not yield best performance because operation condition such as periodic disturbance was not considered. In this paper, the weighting matrix is fixed and controller is designed to minimize the new performance index to reduce the effects of periodic-type disturbances. This method is applied to design the satellite controller to verify the effetiveness.

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시변 주기외란 신호에 대한 강인 적응형 하이브리드 제어시스템 (Robust Adaptive Hybrid Control System against Time-varying Periodic Disturbance Signal)

  • 조현철;김관형
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2011년도 춘계학술대회
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    • pp.586-588
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    • 2011
  • Adaptive feedforward control(AFC) is largely aimed for improving control performance of dynamic systems particularly involving periodic disturbance signals in engineering fields. This paper presents a novel hybrid AFC approach for specific systems with multiple disturbances in control input and state variables. The proposed AFC mechanism is hierarchically composed of the conventional AFC and a PID typed auxiliary control law in parallel. The former is generic to decrease periodic disturbance in control actuators and the latter is additionally constructed to overcome control deterioration due to time-varying uncertainty of given systems. We carry out numerical simulation to test reliability of the hybrid AFC system and compare its control performance with a well-known conventional AFC method in terms of time and frequency domains for proving of its superiority.

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