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Multi-channel Active Noise Control Using Subband Hybrid Adaptive Filters (서브밴드 하이브리드 적응필터를 이용한 다중채널 능동소음제어)

  • 남현도;김덕중;박용식
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.14 no.1
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    • pp.94-101
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    • 2000
  • In this paper, a multi-channel active noise control(ANC) system using subband hybrid control techniques is proposed. Subband techniques could reduce computational burden and improve the performance of ANC systems by dividing several frequency subband and adjusting adaptive filter coefficients. So it can effectively cancel noises at wanted frequency range and use lower order adaptive filter than the existing algorithms. The adjoint LMS algorithm, which prefilter the error signals instead of the divided reference signals in frequency band, is also used for adaptive filter algorithms to reduce the computational burden of the subband adaptive systems. To improve performance of the ANC system, a weighted hybrid control technique, which has weightily properties of feedforward control systems and feedback control systems, is applied. This algorithm shows higher stability and good noise attenuation property in broad band ANC systems. Computer simulations were performed to show the effectiveness of the proposed algorithm.

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Multiuser Interference Cancellation Scheme using Orthogonal Polynomial Approximation for Multiuser Signal Detection in CDMA Systems (직교 다항식의 근사화를 적용한 다중 사용자 간섭 제거기법)

  • 노재호;최수용;이미숙;신기수;홍대식;강창언
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.7B
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    • pp.928-936
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    • 2001
  • 본 논문은 CDMA 시스템을 근간으로 향후 서비스 될 3세대 이동통신 시스템에 선택적으로 적용될 수 있는 다중 사용자 간섭 제거 기법을 제안한다. 제안 방식은 다단계 간섭 제거기의 각 단계에 직교 다항식의 근사화 기법을 적용하여 제거될 간섭 신호의 양을 결정하고, 이를 상호 보완적으로 제거한다. 사용자 용량의 포화도에 따른 최적해로의 수렴성을 각 방식의 스펙트럼 반경의 분석을 통해 비교하였으며, 제안한 방식이 병렬 간섭 제거 기법(Parallel Interference Cancellation, PIC)을 사용한 방식과 비교하여 2배 이상의 적은 단계를 사용했음에도 거의 같은 정도의 오차 성능을 보였으며, 실험을 통해 비트 오율이 $10^{-5}$을 기준으로 약 30% 정도의 사용자 수용 능력이 증대되었다. 또한 전력 제어의 적용 여부에 대한 시스템의 비트 오율 측면의 성능 비교, 원근 효과의 관점에서 성능을 비교하여 제안된 간섭 제거 기법이 비적응형 가중치를 적용한 병렬 간섭 제거 기법보다 우수함을 보였다.

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The synchronous DQ-frame observer and the speed adaptation for algorithm for indirect vector control of sensorless induction motor (센서없는 유도전동기의 간접 벡터제어를 위한 동기 좌표계 관측기 및 속도적응 알고리즘)

  • Shin, Hwi-Beom;Park, Jong-Gyu;Kim, Bong-Sick
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.458-460
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    • 1996
  • In this study, the full-state flux observer is designed in the synchronous DQ-frame and the speed adaptation rule is derived by using the MRAS(Model Reference Adaptive System) theory. In this rule, the induction motor becomes a reference model and the flux observer is taken as a adjustable model. A guideline of the adaptation gain is investigated for the precise and stable speed adaptation and the proposed scheme is compared with the conventional one designed in the stationary DQ-frame.

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Vision Sensor for Welding Automation (용접 자동화를 위한 시각센서)

  • 이철원;나석주
    • Journal of Welding and Joining
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    • v.11 no.3
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    • pp.10-21
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    • 1993
  • 용접공정에 시각센서를 도입하여 고정 오차, 용접물 준비 상태에 상관없이 유연성을 확보할 수 있고 용접부 형상에 따라 용접 변수를 조절하는 적응제어가 가능하다. 본 해설에서는 용접 자동 화에 이용되는 시각센서의 원리를 설명하였고 상업화되어 쓰이고 있는 시각센서들을 소개하였다. 시각센서를 용접 공정에 적용하기 위해 센서의 신뢰도 향상, 센서와 로봇간의 정보 교환, 용접환 경으로부터 센서의 보호기술등의 개발이 요구됨을 알 수 있었다. 지난 10여년간 용접자동화에 기 계시각을 도입하고자 하는 연구가 활발히 진행되어 자동차, 항공기, 원자력 발전 설비 등의 생산 현장에서 시각센서의 우수성이 입증되고 있다. 현재 접촉식 센서나 아크센서에 비해 가격이 높은 단점이 있어 상업화에 어려움이 있으나 필요 부품들의 계속적인 가격 하락으로 점차 시각센서의 이용이 증대될 것이다. 특히, 아크센서로는 추적할 수 없는 박판 용접과 레이저 용접등의 정밀 용 접공정에서 수요가 커질 것으로 예상된다.

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Design of Decentralized Multilevel-Multiple Model Adaptive Controller(DM-MMAC) for Power Plant (발전플랜트를 위한 분산다단계-다중모델 적응제어기의 설계)

  • 최선욱;이은호;박용식;김영철
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.9
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    • pp.1119-1125
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    • 1999
  • In this paper, a decentralized multilevel-adaptive controller for a boiler-turbine system is designed by using multiple model adaptive method. It is applied to the drum type boiler-turbine system which is simplified from Boryung T/P #1,2 model. A linearlized model is decomposed into three subsystems by means of linear transformation. Then the DMC based on such subsystem is designed and a Multiple Model Adaptive Control(MMAC) scheme is applied for the purpose of the good tracking to variable load demands of the thermal power plant. The good performance of the designed controller is shown by simulations in various conditions that have the large step and ramp change of power demamd.

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An Analysis of Adaptive Fuzzy Sliding Mode Controller of Nonlinear System (적응 퍼지 슬라이딩 모드 제어기설계를 위한 새로운 해석)

  • Kong, Hyoung-Sic;Hwang, Eun-Ju;Park, Mignon
    • Proceedings of the KIEE Conference
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    • 2005.10b
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    • pp.161-163
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    • 2005
  • This paper is concerned with an Adaptive Fuzzy Sliding Mode Control(AFSMC) that the fuzzy systems are used to approximate the unknown functions of nonlinear system. In the adaptive fuzzy system. we adopt the adaptive law to approximate the dynamics of the nonlinear plant and to adjust the parameters of AFSMC. The stability of the suggested control system is proved via Lyapunov stability theorem. and convergence and robustness properties are demonstrated. The simulation results demonstrate that the performance is improved and the system also exhibits stability.

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Robust Adaptive Pole Assignment Control using Pseudo Plant (의사모형화 방법을 이용한 극배치 적응제어기의 강인성 개선)

  • 김국헌;박용식;허명준;양흥석
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.5
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    • pp.319-326
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    • 1988
  • In the presence of unmodeled dynamics, the robustness of adaptive pole assignment control using new pseudo-plant is presented. The pseudo-plant proposed by Donati et al. is modified as the gain of low pass filter can be set from zero to one. This modified pseudo-plant results in the reduction of modeling error. It is shown that not only this approach is insensitive to input frequency but also it improves the conic condition developed by Ortega et al. which is required to assure stability of adaptive control system despite the model-plant mismatch. A simple method to compensate the tracking error due to the use of pseudo-plant is considered.

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Variable Impedance Control for Industrial Manipulators Based on Sensor-Less External Force Estimator for CPPS (CPPS를 위한 산업용 매니플레이터의 힘 센서리스 외력 추정기 기반 적응 임피던스 제어)

  • Park, Jongcheon;Han, Seungyong;Jin, Yongsik;Lee, Sangmoon
    • IEMEK Journal of Embedded Systems and Applications
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    • v.14 no.5
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    • pp.259-267
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    • 2019
  • This paper proposes a structure of a variable impedance control system based on sensor-less external force estimator of industrial manipulators for cyber physical production systems (CPPS). To implement CPPS, a feedback system is constructed by using the robot operating system (ROS) and an external force estimator which is designed to measure the external force applied to the manipulator without a force sensor. Based on the robot dynamics, the robot-human cooperating system for the cyber physics production system is implemented through a controller that changes the impedance characteristics of the manipulator according to the situation using the external force estimator. Simulation and experimental results verify the effectiveness of the proposed control system.

A study on the Adaptive Variable Structure Controller with Nonlinear Switching Surfaces (비선형 스위칭 평면을 가지는 적응가변구조 제어기 설계)

  • Park, Soo-Sik;Lee, Dae-Sik
    • Proceedings of the KIEE Conference
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    • 1996.11a
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    • pp.52-54
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    • 1996
  • A number of algorithm using the VSS(Variable Structure System) for uncertain dynamic system are developed. But, in these algorithms, the assumption that the uncertainties are bounded and their bounds are available to the designer is involved. And bounds on the uncertainties are an important clue to guarantee the stability of the closed loop system. However, sometimes bounds on the uncertainties may not be easily obtained because of the complexity of the structure of the uncertainties. Therefore, a methodology by which the boundary values on the uncertainties can be easily obtained is required. The VSS proposed in this proposal employ the new adaptive VSS scheme for uncertain dynamic system being estimated on line. The resulting control law is simple and easy to apply to on line computer control. It can also suppress chattering and maintain good tracking precision even if unmodeled dynamics are considered. And, a new method using nonlinear switching surface is introduced so that the speed response is improved and the good transient response can be obtained. Simulation results are presented and show the advantage of the proposed adaptive VSS with nonlinear switching surfaces.

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Sprinkler System with Universal Solenoid Valve (범용 전자개방밸브를 적용한 스프링클러설비)

  • Kong, Ha-Sung
    • The Journal of the Convergence on Culture Technology
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    • v.5 no.3
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    • pp.351-357
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    • 2019
  • This research is automatic Wet Pipe Sprinkler System, dry pipe Sprinkler System, preaction Sprinkler system, vacuum Sprinkler system, deluge Sprinkler system, etc., key components of each Sprinkler system, verve valve, valve, etc. This is to simplify the various processes of the manufacturing process into a single process to create an environment in which a single machine can simultaneously produce a standardized product, thereby improving the price competitiveness of the product, reducing the cost of maintaining the product, and making it more adaptable to the new sprinkler system that is developed in the future. Automatic Wet Pipe Sprinkler System, desipe Sprinkler System, preaction sprinkler system, vacuum Sprinkler system, deluge Sprinkler system, both types of existing Sprinkler system, only replace the primary and secondary tubing valves.It has the advantage of being easy to apply to the lower system. Legal and institutional research is needed for the commercialization of the Sprinkler system applying the solenoid valve as a future project.