• 제목/요약/키워드: weighting factors

검색결과 426건 처리시간 0.022초

연계(連繫)된 전력계통(電力系統)의 최적(最適) 부하주파수(負荷周波數) 제어(制御)

  • 한만춘;장성환
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1979년도 하계 전자.전기연합학술발표회논문집
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    • pp.119-120
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    • 1979
  • A linear state equation of the first order differential form relating the load-frequency dynamic characteristics of interconnected power systems was derived for use in computer simulation. A now solution of the algebraic matrix riccati equation for application in quadratic optimal controllor and least-square state estimator dermination was developed. The program for a dynamic state equation for two interconnected control areas was developed. The optimized load-frequency deviation was analysed and a numerical analysis was tried based on the computer simulation. It was shown that the dynamic response of th loed-frequency could be optimized with weighting factors IR and Q. The result was that the load-frequency and the tie-line deviation were visibly reduced.

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A GNSS Interference Detection Method Based on Multiple Ground Stations

  • Kim, Sun Young;Kang, Chang Ho;Yang, Jeong Hwan;Park, Chan Gook;Joo, Jung Min;Heo, Moon Beom
    • Journal of Positioning, Navigation, and Timing
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    • 제1권1호
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    • pp.15-21
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    • 2012
  • For a GNSS receiver's robustness against RFI and the high accuracy of navigation solution in GNSS, interference source detection and mitigation are needed. In this paper, an adaptive lattice IIR notch filter is employed to track single-tone continuous wave and swept continuous wave interference signals, and an interference detection method is proposed. Furthermore, this paper presents interference source characterization algorithm using multiple ground stations' interference detection results. The measurement of the signal powers from each ground station is used to build weighting factors to estimate the type of the interference. The performance of interference detection algorithm is simulated for scenarios of GPS signal in the presence of single-tone continuous wave interference and swept continuous wave interference.

신경망을 이용한 이동로봇 궤적제어기 성능개선 (A Performance Improvement for Tracking Controller of a Mobile Robot Using Neural Networks)

  • 박재훼;이만형;이장명
    • 제어로봇시스템학회논문지
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    • 제10권12호
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    • pp.1249-1255
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    • 2004
  • A new parameter adaptation scheme for RBF Neural Network (NN) has been developed in this paper. Even though the RBF Neural Network (NN) based controllers are robust against both un-modeled dynamics and external disturbances, the performance is not satisfactory for a fast and precise mobile robot. To improve the tracking performance as well as robustness, all the parameters of RBF NN are updated in real time. The stability of this control law is rigorously proved by following the Lyapunov stability theory and shown by the experimental simulations. The fact that all of the weighting factors, width and center of RBF NN have been updated implies that this scheme utilizes all the possibilities in RBF NN to make the controller robust and precise while the mobile robot is following un-known trajectories. The performance of this new algorithm has been compared to the conventional RBF NN controller where some of the parameters are adjusted for robustness.

TITO시스템의 LQ-Pl제어기 동조 (A LQ-Pl Controller Tuning for TITO System)

  • 엄태호;서병설
    • 전자공학회논문지SC
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    • 제41권5호
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    • pp.37-42
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    • 2004
  • 다변수 제어시스템의 최적 PI동조에 관한 연구는 난해하기 때문에 일반적인 방법으로 접근하기 힘들다. 본 논문에서는 다변수 시스템을 2-입력, 2-출력의 2차시스템을 고려하여 PI제어요소가 포함된 폐루프 상태방정식과 LQR의 폐루프 상태방정식의 관계를 유도하는 루프형성절차를 통해 주파수 영역 설계사양과 만족할 수 있도록 가격함수의 가중치 요소 Q와 R을 선정함으로써 성능 및 안정도-강인성이 보장되는 분산된 최적 강인 PI제어기 설계방법을 제안하고자 한다.

LQ-PID 제어기 동조-시간영역에서의 접근 (Tuning of LQ-PID Controller-Time Domain Approach)

  • 양지훈;서병설
    • 전자공학회논문지SC
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    • 제41권1호
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    • pp.17-24
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    • 2004
  • 본 논문은 2차 시스템에서 시간영역의 설계 사양을 만족하는 최적 강인 LQ-PID 제어기 설계방법을 제안한다. LQ-PID제어기 동조파라미터들은 시간영역의 설계사양인 오버슈트와 정착시간의 설계파라미터들과 LQR의 가중치요소 Q와 R의 관계에 의해서 설계될 수 있었다. 그래서 안정도-강인성뿐만 아니라 시간영역에서의 성능-강인성을 이룰 수 있었다.

지구정보시스템을 이용한 충주호 북부 지역의 사면 안정 평가 (Analysis of Slope Stability Using GIS in the Northern Area of Chungju Lake)

  • 문상기
    • 자원환경지질
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    • 제33권1호
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    • pp.51-59
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    • 2000
  • As a part of natural hazard assessment, regional slope stability analysis was conducted using Geoscientific Information System (GIS) in the northern area of Chungju Lake. Selected factors which affect the slope stability in the study area were lithology, soil, density of lineament, groundwater level, dip of slope, aspect of slope, and geological engineering properties. Geological structural domains were determined by collected data of joint orientation from about 200 sites in order to produce a slope instability map. Potential type of failure and its direction could be expected through the domains. And a slope instability map was produced, comparing the representative orientations of the domains with the orientations of the slopes which were made through TIN module in ARC/INFO. Under the consideration of environmental geological characteristics of the study area, rating and weighting of each factor of slope stability analysis were decided and spatial analysis of regional slope stability was couducted through overlaying technique of GIS. The result of areal distribution of slope stability showed that the most unstable area was the area between Mt. Pudae and Mt. Jubong, and the northern area of the railway station, Samtan.

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지능형 Hull구조물의 능동 진동제어 (Active Vibration Control of Smart Hull Structures)

  • 손정우;최승복;김흥수
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2005년도 춘계학술대회논문집
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    • pp.192-195
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    • 2005
  • In this study, dynamic characteristics of an end-capped hull structure with surface bonded piezoelectric actuators are studied. Finite element modeling is used to obtain practical governing equation of motion and boundary conditions of smart hull structure. Modal analysis is conducted to investigate the dynamic characteristics of the hull structure. Piezoelectric actuators are attached where the maximum control performance can be obtained. Active controller based on Linear Quadratic Gaussian (LQG) theory is designed to suppress vibration of smart hull structure. It is observed that closed loop damping can be improved with suitable weighting factors in the developed LQG controller.

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전기화재 원인진단을 위한 지능형 프로그램 개발 (Development of an Intelligent Program for Diagnosis of Electrical Fire Causes)

  • 권동명;홍성호;김두현
    • 한국안전학회지
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    • 제18권1호
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    • pp.50-55
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    • 2003
  • This paper presents an intelligent computer system, which can easily diagnose electrical fire causes, without the help of human experts of electrical fires diagnosis. For this system, a database is built with facts and rules driven from real electrical fires, and an intellectual database system which even a beginner can diagnose fire causes has been developed, named as an Electrical Fire Causes Diagnosis System : EFCDS. The database system has adopted, as an inference engine, a mixed reasoning approach which is constituted with the rule-based reasoning and the case-based reasoning. The system for a reasoning model was implemented using Delphi 3, one of program development tools, and Paradox is used as a database building tool. To verify effectiveness and performance of this newly developed diagnosis system, several simulated fire examples were tested and the causes of fire examples were detected effectively by this system. Additional researches will be needed to decide the minimal significant level of the solution and the weighting level of important factors.

농용 트랙터의 시트의 진동 승차감 평가 (Ride Quality Evaluation of Agricultural tractor Seats)

  • 이종광;박세진;강영선;강이석
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 2001년도 동계 학술대회 논문집
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    • pp.16-21
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    • 2001
  • The ride quality of agricultural tractor seats is evaluated based on the vibration of the human bodies. Tractor ride vibration levels have been measured at the person-seat interface along 7 axes(3 translational axes at the feet, 3 translational axes on a seat surface and 1 axis at the seat back), under different operating conditions. Since one of the most important parameters for ride comfort is the level and duration of the root mean square acceleration experienced, the ride values, such as the seat effective amplitude transmissibility, the component ride value, and the overall ride value based on acceleration root mean square are evaluated for a conventional tractor using frequency weighting functions and axis multiplying factors. The ride indices are also studied considering to the variation of vehicle speed and road profile.

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Damage-Based Seismic Performance Evaluation of Reinforced Concrete Frames

  • Heo, YeongAe;Kunnath, Sashi K.
    • International Journal of Concrete Structures and Materials
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    • 제7권3호
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    • pp.175-182
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    • 2013
  • A damage-based approach for the performance-based seismic assessment of reinforced concrete frame structures is proposed. A new methodology for structural damage assessment is developed that utilizes response information at the material level in each section fiber. The concept of the damage evolution is analyzed at the section level and the computed damage is calibrated with observed experimental data. The material level damage parameter is combined at the element, story and structural level through the use of weighting factors. The damage model is used to compare the performance of two typical 12-story frames that have been designed for different seismic requirements. A series of nonlinear time history analyses is carried out to extract demand measures which are then expressed as damage indices using the proposed model. A probabilistic approach is finally used to quantify the expected seismic performance of the building.