Global ETD Search

1	Comparative Study: Time-Delay Method and Sliding Mode Technique for Perturbation Estimation Huang, Jenn-Ming 15 July 2002 (has links) Two different perturbation estimation methodologies are compared in this thesis. One is time delay method (TDM), the other is sliding mode techniqueli (SMT). When analyzing the TDM, Pade approximation is used to approximate a function with time-delay argument. The comparisons of perturbation estimation accuracy resulted from TDM and SMT both in time domain and frequency domain are addressed, and two numerical examples are also given for demonstration. time delay method sliding mode technique Pade approximation
2	[en] IDENTIFICATION OF BOX AND JENKINS: A COPARISON BETWEEN FACE AND PADÉ APPROXIMATION / [pt] IDENTIFICAÇÃO DOS MODELOS BOX E JENKINS: UMA COMPARAÇÃO ENTRE O MÉTODO FACE E O MÉTODO DE APROXIMAÇÃO DE PADÉ LUIZ CLAUDIO RIBEIRO 18 September 2006 (has links) [pt] Desde de 1970, quando Box e Jenkins introduziram os modelos ARMA para análise e previsão de séries temporais, muitos estudos foram desenvolvidos buscando encontrar um método mais eficiente de identificação de tais modelos. Tal fato se deu porque o método por Box e Jenkins, baseado na função de auto-correlação parcial (FACP) não são eficientes quando os modelos apresentam componentes auto- regressivas (AR) e médias móveis (MA). Estudos comparativos realizados anteriormente mostraram que dentre os métodos de identificação já desenvolvidos, o que se mostrou mais eficiente foi o baseado na função de auto-correlação extendida (FACE) de TIAO e TSAY (1992) Recentemente, Kuldeep Kumar introduziu na literatura um método de identificação baseado na teoria de aproximação de Padé. O objetivo deste trabalho é comparar o método da FACE com o método baseado na teoria de aproximação de Padé. / [en] Since 1970, when Box and Jenkins first introduced the ARMA models to analysis and predict of time series data, a lot of studies have been developed to find an efficient identification method for such models. This was due the fact that the identification method proposed by Box and Jenkins, based on Auto-correlation Function (ACF) and Partial Auto-correlation Function (PACF), are inefficient when the models have auto regressive - AR- and moving average - MA- components. Comparative studies undertaken, have shown that, among the identification methods already developed, the method based on the Extended Auto-correlation Fuction of Tiao and Tsay (1982) is the most efficient. More recently, however, Kuldeep Kumar has introduced in the literature an identification method based on the theory of Padé aproximation. The objective of this paper is to compare the Extended Auto-correlation Function method with the method based on the Theory of Padé approximation. [pt] IDENTIFICACAO [en] IDENTIFICATION [pt] MODELO BOX E JENKINS [en] BOX AND JENKINS [pt] APROXIMACAO DE PADE [en] PADE APPROXIMATION
3	Řízení dynamických systémů v reálném čase / Real Time Dynamic System Control Adamík, Pavel January 2009 (has links) This thesis focuses on the methodology of controlling dynamic systems in real time. It contents a review of the control theory basis and the elementary base of regulators construction. Then the list of matemathic formulaes follows as well as the math basis for the system simulations using a difeerential count and the problem of difeerential equations solving. Furthermore, there is a systematic approach to the design of general regulator enclosed, using modern simulation techniques. After the results confirmation in the Matlab system, the problematics of transport delay & quantization modelling follow.
4	電気鉄道き電システムの雷対策に向けた実測およびシミュレーション技術に関する一研究 / デンキテツドウキデンシステムノカミナリタイサクニムケタジッソクオヨビシミュレーションギジュツニカンスルイチケンキュウ田中弘毅, Hiroki Tanaka 22 March 2017 (has links) 電気鉄道の安全安定輸送を確保するため，雷害防止が求められている。本論文では，電気鉄道設備の雷サージ特性実測を行い，接地インピーダンス特性を雷サージの視点から検討した。さらに，電力系統解析技術を応用して鉄道特有機器の回路解析モデルを開発し，その精度を実測で確認し，鉄道設備雷電流侵入時の応答を実測および計算結果より明らかにした。これらの成果は，電気鉄道の設計・保守・解析に十分に生かすことが可能である。 / Lightning protection is required to ensure safe and stable electric railway transportation. In this thesis, the lightning surge characteristics of the facilities in electric railway systems were measured. The characteristic of earthing impedance was also investigated from the viewpoint of lightning surge. In addition, some numerical models of railway specific apparatuses for circuit analysis method were developed by applying simulation technology for power system and confirmed their accuracies by actual measurements. The responses to lightning currents invaded into the facilities were clarified by the measured and calculated results. These results can be fully utilized in the design, maintenance and analysis of electric railway systems. / 博士(工学) / Doctor of Philosophy in Engineering / 同志社大学 / Doshisha University 雷サージ接地インピーダンスサージインピーダンス数値ラプラス変換電鉄用変電所レール周波数依存効果 Semlyen 線路モデルパデ近似非均質線路過渡現象埋設地線 FDTD法 EMTP lightning surge earthing impedance surge impedance numerical Laplace transform traction substation rail frequency dependent effect Semlyen's line model Pade approximation nonhomogeneous line transient phenomenon counterpoise FDTD method

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