• Title/Summary/Keyword: Algebraic method

Search Result 614, Processing Time 0.029 seconds

A NEW APPROACH FOR STABILIZATION OF NONSTENDAD SINGULARLY PERTYRBED SYSTEMS

  • Xu, Hua;Mukaidani, Hiroaki;Mizukami, Koichi
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1995.10a
    • /
    • pp.99-102
    • /
    • 1995
  • In this paper, we consider the stabilization problem of nonstandard singularly perturbed systems by using state feedback. Different fro the existing sequenetial designn procedures, we propose a parallel design method to construct the stabilizing controller. The method involves solving two completely independent algebraic Riccati equations.

  • PDF

Pad and Parasitic Modeling for MOSFET Devices (MOSFET 기생성분 모델링)

  • 최용태;김기철;김병성
    • Proceedings of the IEEK Conference
    • /
    • 1999.11a
    • /
    • pp.181-184
    • /
    • 1999
  • This paper presents the accurate deembeding method for pad and parasitics of MOSFET device. rad effects are deembedded using THRU LINE, which is much simpler method without laborious fitting procedure compared with conventional OPEN and SHORT pad modeling. Parasitic resistance extraction uses the algebraic relation between increments of inversion layer charge and oxide capacitance. It is especially adequate for insulating gate junction device. Extracted parasitics are verified through comparing modeled and measured S parameters.

  • PDF

A study on the parameter identification of conitnuous linear systems via sal-cal functions (SAL-CAL에 의한 연속 선형계에서의 파라메타 추정에 관한 연구)

  • 안두수;이해기;유상진;김민형
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1990.10a
    • /
    • pp.821-824
    • /
    • 1990
  • This paper presents a method for Identification of a continuous time linear system parameters. We take the plant driven by percitently exciting input. To express the integral functions in terms of measured periodic output data. We use the Walsh function based on cal-sal functions. The linear algebraic equations for parameter identification is obtained. The present method Is simple and computationally advantageous.

  • PDF

An Unified Method of Finding the Inverse of a Matrix with Entries of a Linear Combination of Piecewise Constant Functions (각 항들이 구간 일정 함수의 선형 결합으로 표현된 행렬의 역을 구하는 방법)

  • ;Zeung Nam Bien
    • Journal of the Korean Institute of Telematics and Electronics
    • /
    • v.25 no.6
    • /
    • pp.606-613
    • /
    • 1988
  • This paper presents an unified method of obtaining the inverse of a matrix whose elements are a linear combination of piecewise constant functions. We show that the inverse of such a matrix can be obtained by solving a set of linear algebraic equations.

  • PDF

ABSOLUTE IRREDUCIBILITY OF BIVARIATE POLYNOMIALS VIA POLYTOPE METHOD

  • Koyuncu, Fatih
    • Journal of the Korean Mathematical Society
    • /
    • v.48 no.5
    • /
    • pp.1065-1081
    • /
    • 2011
  • For any field F, a polynomial f $\in$ F[$x_1,x_2,{\ldots},x_k$] can be associated with a polytope, called its Newton polytope. If the polynomial f has integrally indecomposable Newton polytope, in the sense of Minkowski sum, then it is absolutely irreducible over F, i.e., irreducible over every algebraic extension of F. We present some results giving new integrally indecomposable classes of polygons. Consequently, we have some criteria giving many types of absolutely irreducible bivariate polynomials over arbitrary fields.

Reynolds Number Dependence of Bearing Performance

  • Kim E.
    • 한국전산유체공학회:학술대회논문집
    • /
    • 1997.10a
    • /
    • pp.149-154
    • /
    • 1997
  • Based on the full Navier-Stokes solutions, the thermohydrodynamic performance of a long journal bearing is investigated. A numerical method based on Galerkin's procedure and B-spline test functions has been presented for solving two-dimensional problems involving fluid flow and heat transfer. For numerical stability the artificial compressibility is employed to the conservation of mass. The discretized algebraic equations are solved by Newton's method. Effects of varying the speed of an inner cylinder to load carrying capacity are investigated. The results indicated that the increase of the speed of an inner cylinder has a significant effect on the temperature profile and ultimately on the performance.

  • PDF

DIRECT FREQUENCY REPRESENTATION OF PULSE PATTERNS FOR CONTROLLED VOLTAGE SOURCE INVERTERS

  • Oleschuk, Valentin;Bose, Bimal K.
    • Proceedings of the KIPE Conference
    • /
    • 1998.10a
    • /
    • pp.165-170
    • /
    • 1998
  • The paper describes developed method of feedforward digital modulation of line-to-line voltage of 3-phase inverter for drive application. It is based on representation of parameters of output voltage of inverter in function of operating frequency of drive system. Pure algebraic control laws and big computational simplicity characterize this scheme of modulation. It has been presented results of simulation of adjustable drive systems with the method of pulse-width modulation described.

  • PDF

Application of H¡? Controller Design Method to a Linear Singularly Perturbed System (H$\infty$ 제어기 설계법의 선형 특이섭동 시스템에의 적용)

  • Yoo, Seog-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers
    • /
    • v.43 no.4
    • /
    • pp.648-657
    • /
    • 1994
  • This paper presents a solution of the H$\infty$ control problem for a linear singularly perturbed system. A sufficient condition for a linear singularly perturbed system to achieve the prescribed disturbance attenuation level is obtained. Based upon this sufficient condition, an H$\infty$ controller design method which involves the solutions of two generalized algebraic Riccati equations(GRE) is developed.

AN EFFICIENT IMPLEMENTATION OF BDM MIXED METHODS FOR SECOND ORDER ELLIPTIC PROBLEMS

  • Kim, J.H.
    • Journal of the Korean Society for Industrial and Applied Mathematics
    • /
    • v.7 no.2
    • /
    • pp.95-111
    • /
    • 2003
  • BDM mixed methods are obtained for a good approximation of velocity for flow equations. In this paper, we study an implementation issue of solving the algebraic system arising from the BDM mixed finite elements. First we discuss post-processing based on the use of Lagrange multipliers to enforce interelement continuity. Furthermore, we establish an equivalence between given mixed methods and projection finite element methods developed by Chen. Finally, we present the implementation of the first order BDM on rectangular grids and show it is as simple as solving the pressure equation.

  • PDF

Numerical Solutions of Fractional Differential Equations with Variable Coefficients by Taylor Basis Functions

  • Kammanee, Athassawat
    • Kyungpook Mathematical Journal
    • /
    • v.61 no.2
    • /
    • pp.383-393
    • /
    • 2021
  • In this paper, numerical techniques are presented for solving initial value problems of fractional differential equations with variable coefficients. The method is derived by applying a Taylor vector approximation. Moreover, the operational matrix of fractional integration of a Taylor vector is provided in order to transform the continuous equations into a system of algebraic equations. Furthermore, numerical examples demonstrate that this method is applicable and accurate.