• 제목/요약/키워드: Distributed-parameter system

검색결과 220건 처리시간 0.028초

분포정수계통의 최적제어 필요조건 (Necessary Conditions of Optimal Distributed Parameter Control Systems)

  • 양경갑
    • 전기의세계
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    • 제19권2호
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    • pp.21-23
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    • 1970
  • Necessary conditions of optimal distributed parameter control systems, Hamiltons coanonical equations, welerstress condition, transversality condition and boundary condition are obtained, when the control function is constrained and the performance index takes on the general form. Also it is concluded that the lumped parameter system is the special case of the distributed parameter system.

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다단 연속 회전체 베어링 계의 일반화된 모드 해석 (A Generalized Modal Analysis for Multi-Stepped, Distributed-Parameter Rotor-Bearing Systems)

  • 박종혁;홍성욱
    • 소음진동
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    • 제9권3호
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    • pp.525-534
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    • 1999
  • The present paper proposes a generalized modal analysis procedure for non-uniform, distributed-parameter rotor-bearing systems. An exact element matrix is derived for a Timoshenko shaft model which contains rotary inertia, shear deformation, gyroscopic effect and internal damping. Complex coordinates system is adopted for the convenience in formulation. A generalized orthogonality condition is provided to make the modal decomposition possible. The generalized modal analysis by using a modal decomposition delivers exact and closed form solutions both for frequency and time responses. Two numerical examples are presented for illustrating the proposed method. The numerical study proves that the proposed method is very efficient and useful for the analysis of distributed-parameter rotor-bearing systems.

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분포매개정수를 갖는 원자로의 최적제어 1

  • 지창열;김상훈
    • 전기의세계
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    • 제29권1호
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    • pp.53-57
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    • 1980
  • The analytical treatment for a terminal cost problem of a distributed reactor with a small singular parameter is presented. The inverse of the neutron velocity is regarded as a singular parameter, and the model, adopted for simplicity, is a cylindrically symmetrical reactor. The Helmholtz mode expension is used for the application of the optimal theory for lumped parameter systems to the spatially distributed parameter system. The closed-form solution is explicitely obtained for machine calculation.

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고속 WALSH 변환에 의한 분포정수계의 최적제어 (Optimal Control of Distributed Parameter Systems Via Fast WALSH Transform)

  • 김태훈;김진태;이승;안두수
    • 대한전기학회논문지:시스템및제어부문D
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    • 제50권10호
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    • pp.464-472
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    • 2001
  • This study uses distributed parameter systems as the spatial discretization technique, modelling in lumped parameter systems, and applies fast WALSH transform and the Picard's iteration method to high order partial differential equations and matrix partial differential equations. This thesis presents a new algorithm which usefully exercises the optimal control in the distributed parameter systems. In exercising optimal control of distributed parameter systems, excellent consequences are found without using the existing decentralized control or hierarchical control method. This study will help apply to linear time-varying systems and non-linear systems. Further research on algorithm will be required to solve the problems of convergence in case of numerous applicable intervals.

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연속계의 이산화를 위한 새로운 모델링 기법 (A new modeling technique for the distributed parameter system - digital modeling approach)

  • 이용관;김인수;홍성욱
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 1995년도 추계학술대회논문집; 한국종합전시장, 24 Nov. 1995
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    • pp.227-232
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    • 1995
  • This paper presents a digital modeling technique for the distributed parameter system. The basic idea of the proposed technique is to discretize a continuous system with respect to the spatial coordinate using the approximate methods such as bilinear method and backward difference method. The response of the discretized system is analyzed by Laplace transform and Z transform. The computational result of the proposed technique in a torsional shaft is compared with the exact solution and the result of the finite element method.

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분산 전원의 고립 운전 검출 기법의 개발 (Development of a New Islanding Detection Method for Distributed Resources)

  • 장성일;김광호
    • 대한전기학회논문지:전력기술부문A
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    • 제50권11호
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    • pp.506-513
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    • 2001
  • The islanding detection for distributed resources (DR) becomes an important and emerging issue in power system protection since the distributed generator installations are rapidly increasing and most of the installed systems are interconnected with distribution network. In order to avoid the negative impacts from islanding operations of DR on protection, operation and management of distribution system, it is necessary to effectively detect the islanding operations of DR and rapidly disconnect it from distribution network. Generally, it is difficult to detect islanding operation by monitoring only one system parameter This paper presents a new logic based islanding detection method for distributed resources(DR) which are interconnected with distribution network. The proposed method detects the islanding operation by monitoring four system parameter: voltage variation, phase displacement, frequency variation, and the variation of total harmonic distortion(THD) of current; therefore, it effectively detects island operation of DR unit operating in parallel with the distribution network. We also verified the efficiency of the proposed algorithm using the radial distribution network of IEEE 34 bus model.

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고속 월쉬 변환을 이용한 이동 유체간 열교환 상태 해석에 관한 연구 (A Study on State Analysis of Heat Exchange between Counter-Flow Fluid via Fast Walsh Transform)

  • 김태훈;이승
    • 조명전기설비학회논문지
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    • 제15권6호
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    • pp.73-81
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    • 2001
  • 분포정수계는 시스템이 두 개 이상의 독립변수로 표현되면서 또한 각 변수에 대한 미분을 포함하는 편미분 방정식으로 표현되므로, 분포정수계에 직접적인 최적제어 논리를 도입하는 것은 매우 어렵다. 본 연구에서 제시하고자하는 새로운 알고리즘은 월쉬 함수 고유특성을 그대로 유지할 수 있는 유한급수전개방법을 이용함과 동시에 계산의 편리성을 위하여 고속 월쉬 변환을 사용하는 것으로서, 본 연구 방법을 사용하면 역행렬 연산이 필요 없게 되므로 기존의 방법에 의해 처리하기 힘든 분포정수계, 선형시변계, 비선형계의 해석 및 제어문제어도 쉽게 적용할 수 있다.

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WALSH함수의 접근에 의한 분포정수계의 파라메타 추정 (An Approach to Walsh Functions for Parameter Estimation of Distributed Parameter Systems)

  • 안두수;배종일
    • 대한전기학회논문지
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    • 제39권7호
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    • pp.740-748
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    • 1990
  • In this paper, we consider the problem of parameter estimation, i.e., definding the internal structure of a linear distribution parameter system from its input/output data. First, a linear partial differential equation describing the system is double-integrated with respect to two variables and then transformed into an integral equation. Next the Walsh Operation Matrix for Walsh function and their integration are introduced to transform the integral equation into algebraic simultaneous equations. Finally, we develop an algorithm to estimate the parameters of the linear distributed parameter system from the simple linear algebraic simultaneous equations. It is also shown that our algorithm could be effective in real time data processing since it uses the Fast Walsh Transform.

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