Дисертації з теми "Equivalent Circuit Analysis"
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Choi, Pyung. "An equivalent circuit structure macromodel for analog phase locked loops." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/14875.
Повний текст джерелаDanielsson, Christer. "Analysis of Synchronous machine dynamics using a novel equivalent circuit model." Licentiate thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10510.
Повний текст джерелаYasar, Orten Pinar. "Numerical Analysis, Design And Two Port Equivalent Circuit Models For Split Ring Resonator Arrays." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611620/index.pdf.
Повний текст джерелаs HFSS software that is based on the finite elements method (FEM). Some of these structures are constructed over low-loss dielectric substrates and their complex scattering parameters are measured to verify the numerical simulation results. The major purpose of this study has been to establish equivalent circuit models to estimate the behavior of SRR structures in a simple and computationally efficient manner. For this purpose, individual single ring SRR cells with multiple splits are modeled by appropriate two-port RLC resonant circuits paying special attention to conductor and dielectric loss effects. Results obtained from these models are compared with the results of HFSS simulations which use either PEC/PMC (perfect electric conductor/perfect magnetic conductor) type or perfectly matched layer (PML) type boundary conditions. Interactions between the elements of SRR arrays such as the mutual inductance and capacitance effects as well as additional dielectric losses are also modeled by proper two-port equivalent circuits to describe the overall array behavior and to compute the associated transmission spectrum by simple MATLAB codes. Results of numerical HFSS simulations, equivalent circuit model computations and measurements are shown to be in good agreement.
Shamsi, Mohammad Haris. "Analysis of an electric Equivalent Circuit Model of a Li-Ion battery to develop algorithms for battery states estimation." Thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-298427.
Повний текст джерелаIseri, Kadir. "Analysis Of Dual-polarized Aperture-coupled Microstrip Antennas With H-shaped Slots And Equivalent Circuit Modeling Of H-shaped Slots." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614527/index.pdf.
Повний текст джерела. The v designed dual-polarized wideband aperture-coupled microstrip antenna is manufactured. Simulation results and measurement results are compared. During the equivalent circuit modeling of an H-shaped slot fed by a microstrip line, an approach based on the reciprocity theorem is utilized. The method was originally proposed for rectangular shaped slots, in this thesis it is generalized for arbitrarily shaped slots. Software codes are developed in MATLAB to calculate the equivalent impedance of the slot.
KRISHNAN, RAJESH. "ANALYSIS OF HIGH-FREQUENCY CHARACTERISTICS OF PLANAR COLD CATHODES." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1061215895.
Повний текст джерелаHasan, Iftekhar Hasan. "Modeling and Analysis of High Torque Density Transverse Flux Machines for Direct-Drive Applications." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1515582377354583.
Повний текст джерелаHashimoto, Kazuki. "Analysis and Design of Air-Core Transformer Based on Internal Magnetic Flux Density Distribution for High-Frequency Power Converter." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263662.
Повний текст джерелаParrow, Jacob Matthew. "Equivalent Circuit Modeling and Signal Integrity Analysis of Magneto-Static Responsive Structures, and Their Applications in Changing The Effective Permittivity of Microstrip Transmission Lines." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/28002.
Повний текст джерелаLogan, Thomas George. "Harmonic analysis of the brushless doubly-fed machine including single-phase operation." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/252277.
Повний текст джерелаSienkiewicz, Lukasz Krzysztof. "Concept, implementation and analysis of the piezoelectric resonant sensor / Actuator for measuring the aging process of human skin." Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0047/document.
Повний текст джерелаThe main goal of the dissertation was following: preparation of a new concept, implementation and analysis of the piezoelectric resonant sensor/actuator for measuring the aging process of human skin. The research work has been carried out in the framework of cooperation between the INP-ENSEEIHT-LAPLACE, Toulouse, France, and at the Gdansk University of Technology, Faculty of Electrical and Control Engineering, Research Group of Power Electronics and Electrical Machines, Gdask, Poland. A concept of transducer for the characterization of mechanical properties of soft tissues was presented. The piezoelectric resonant, bending transducer, referred to as “unimorph transducer” was chosen from different topologies of piezoelectric benders based on the fulfillment of the stated requirements. The innovation of the project lies in the integration of the dynamic indentation method by using a unimorph as an indentation device. This allows the use of a number of attractive electromechanical properties of piezoelectric transducers. The thesis is divided into seven chapters. Chapter 1 states the thesis and goals of the dissertation. Chapter 2 presents piezoelectric phenomenon and piezoelectric applications in the fields of medicine and bioengineering. Chapter 3 describes the requirements for the developed transducer. The choice of unimorph transducer is justified. Chapter 4 presents an analytical description of the unimorph transducer, including the calculations of static deformations, equivalent circuit description, and description of the contact conditions between the transducer and the tested materials. Chapter 5 contains the numerical analysis of the unimorph transducer using FEM virtual model. Results of static and modal simulations are described for two considered geometries of the transducer. Chapter 6 describes the experimental verification process of analytic and numerical models developed for unimorph transducer. The final chapter includes general conclusions concerning obtained research results and achievements, as well as possible future works. In order to verify the proposition of the thesis a full research cycle was carried out, that covered: analytical study, numerical analysis (FEM simulations), prototype realization, and experimental verification of the considered (developed) piezoelectric sensor/actuator structures
Patil, Nishad. "Design And Analysis Of MEMS Angular Rate Sensors." Thesis, Indian Institute of Science, 2006. https://etd.iisc.ac.in/handle/2005/291.
Повний текст джерелаTinelli, Pascal. "Etude et realisation d'un detecteur microdosimetrique destine a la radioprotection." Toulouse 3, 1986. http://www.theses.fr/1986TOU30154.
Повний текст джерелаDareini, Ali. "Prediction and analysis of model’s parameters of Li-ion battery cells." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-11799.
Повний текст джерелаPatil, Nishad. "Design And Analysis Of MEMS Angular Rate Sensors." Thesis, Indian Institute of Science, 2006. http://etd.iisc.ac.in/handle/2005/439.
Повний текст джерелаBártů, Jan. "Analýza mechanického namáhání při zkratu ve vzduchem izolovaném rozváděči vn." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-317035.
Повний текст джерелаPatil, Nishad. "Design And Analysis Of MEMS Angular Rate Sensors." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/291.
Повний текст джерелаSusetyo, Budi. "Modélisation de l'impédance harmonique de charges agrégées." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0027.
Повний текст джерелаWang, Qian. "Elastomer-based Cellular Micromechanical Stimulators for Mechanobiological Study." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397610258.
Повний текст джерелаTessarolo, Alberto. "Modeling and analysis of multiphase machines for high power applications." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3421670.
Повний текст джерелаQuesta tesi di dottorato tratta della modellizzazione ed analisi di machine multiphase di alta potenza. Nella prima parte, si illustra la tecnologia multifase e la varietà delle sue forme progettuali nel campo degli azionamenti elettrici e della generazione di energia elettrica. Nella descrizione, si fa riferimento ad alcune realizzazione industriali significative che mettono in luce le principali problematiche e vantaggi che possono indurre alla scelta di una configurazione multifase in macchie elettriche di grossa taglia. Successivamente, viene trattata una particolare configurazione multifase detta “split-phase”, propria di quelle macchine il cui avvolgimento statorico è suddiviso in *N *sezioni multifase. La modellizzazione di queste macchine è rivisitata da un punto di vista analitico e ne viene fornita una rappresentazione in termini di circuito equivalente; in particolare, si dimostra teoricamente e sperimentalmente che, quando il numero *N* di sezioni statoriche è maggiore di due, si verifica un accoppiamento magnetico tra i circuiti equivalenti di asse diretto e di asse in quadratura. Successivamente, si considera una diversa tecnica di modellizzazione, chiamata Vector-Space Decomposition (VSD), con l’intento di darne una formulazione estesa che si applica trattare ogni tipo di configurazione multifase, sia simmetrica che non, ricorrendo ad opportune trasformazioni geometriche. Particolare attenzione è dedicata alla formulazione di un metodo generale che consente l’inclusione, nel modello della macchina con tecnica VSD, delle armoniche spaziali dovute alla non-idealità della geometria del traferro e della distribuzione degli avvolgimenti. In risultato che ne consegue è la possibilità di incorporare nel modello a parametri concentrati della macchina *n*-fase, realizzato con metodo VSD, alcune informazioni, legate alla geometria e al progetto di dettaglio della macchina, le quali normalmente possono essere tenute in considerazione mediante approcci di simulazione agli elementi finiti. La quantità di informazioni includibile nel modello a parametri concentrati secondo la tecnica proposta si mostra essere tanto maggiore quanto più grande è il numero di fasi *n*. Come esempio di applicazione, si mostra come gli effetti legati alle armoniche spaziali nel funzionamento di una macchina a poli salienti a 6 fasi e a 9 fasi possano essere riprodotti, mediante analisi agli elementi finiti nel dominio del tempo e mediante il metodo a parametri concentrati proposto, con lo stesso livello di accuratezza ma con un significativo risparmio di tempo e di risorse computazionali in quest’ultimo caso. Una parte della tesi è altresì dedicata al calcolo parametrico dei modelli. Riferendosi al caso di numero e distribuzione generici delle fasi di statore, vengono proposti algoritmi di calcolo dei parametri di magnetizzazione basati sulla teoria basata sulle “winding functions” e metodi di calcolo analitici per i parametri di auto e mutua induttanza dispersa. L’accuratezza dei metodi di calcolo proposti è verificata per confronto con misure su macchine reali. La parte finale della tesi è dedicata allo studio di due fenomeni dettagliati che caratterizzando le macchine elettriche multifase alimentate da più invertitori. Con riferimento all’alimentazione da più invertitori a corrente impressa, viene proposto e validato un modello che descrive i transitori di commutazione tenendo conto degli effetti di mutua interazione tra diverse sezioni dell’avvolgimento. Nel caso di alimentazione da più invertitori a tensione impressa, viene indagato analiticamente e sperimentalmente il fenomeno di correnti armoniche di ricircolo tra le fasi a bassa frequenza, dimostrando come esso si verifichi a causa della struttura interna non-ideale della macchina.
Amani, Julian Alexander [Verfasser], Hans Christian [Akademischer Betreuer] [Gutachter] Hofsäss, Michael [Gutachter] Seibt, and Ørjan G. [Gutachter] Martinsen. "A novel approach of immittance-spectra analysis and how it resolves a decade-old deviation of the Frenkel-Poole model : Utilising process-specific physical models to find the electrical equivalent circuit representing the underlying physics in immittance spectroscopy / Julian Alexander Amani ; Gutachter: Hans Christian Hofsäss, Michael Seibt, Ørjan G. Martinsen ; Betreuer: Hans Christian Hofsäss." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://d-nb.info/1126248576/34.
Повний текст джерелаSkalka, Miroslav. "Analýza vlivu mechanického momentu asynchronního stroje na sycení magnetického obvodu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-233534.
Повний текст джерелаPenny, Melissa. "Mathematical modelling of dye-sensitised solar cells." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16270/.
Повний текст джерелаLu, Bin. "Energy Usage Evaluation and Condition Monitoring for Electric Machines using Wireless Sensor Networks." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14152.
Повний текст джерелаPenny, Melissa. "Mathematical modelling of dye-sensitised solar cells." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16270/1/Melissa_Penny_Thesis.pdf.
Повний текст джерелаFarrell, Troy W. "The mathematical modelling of primary alkaline battery cathodes." Thesis, Queensland University of Technology, 1998.
Знайти повний текст джерелаHamdi, Bilel. "Modélisation des circuits périodiques et quasi-périodiques alimentés par des sources arbitraires." Thesis, Toulouse, INPT, 2015. https://oatao.univ-toulouse.fr/25877/1/HAMDI_Bilel.pdf.
Повний текст джерелаPlanar antenna arrays are renowned for their high directivity and ease of implementation, which offers the possibility of having a controllable radiation pattern. However the global study taking into account the different EM couplings by a rigorous electromagnetic theory requires a large memory space and a considerable computation time. To overcome these drawbacks, we propose to introduce a new theoretical approach based on the Floquet theorem allowing the reduction of the EM analysis volume at the level of a single elementary cell (basic cell). We will focus our study on the determination of coupling terms in a distributed configuration in an almost-periodic frame and in particular for periodic and quasi-periodic antenna arrays fed by arbitrary sources. In this case, we will use Floquet mode decompositions (adapted to periodic structures) to extract the coupling matrix [S]. These decompositions are concepts established for a long time and a priori demonstrated by solid theoretical supports. Consequently, this modal analysis makes it possible to simplify considerably the resolution of the problem, especially when the radiating elements are strongly coupled. A single numerical method is adopted in order to model the proposed structure: the method of moments combined with the generalized equivalent circuit: MoM-GEC. Validation of the latter will be done by comparison with other exact numerical methods
AHMADI, DARMANI MOSTAFA. "Multiphysics Design of Interior Permanent Magnet Machines and Characterization of Innovative Hard Magnetic Material." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2971120.
Повний текст джерелаLee, Chih Long, and 李誌隆. "Electric Equivalent Circuit and Three-Dimensional Vibration Analysis for Piezoelectric Transformer." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/63803709877960876741.
Повний текст джерела國立臺灣大學
造船及海洋工程學研究所
89
Abstract In this thesis, use two model method for piezoelectric transformer, (i)The first one consist of performing the analysis with electric equivalent circuit(EEC method). (ii) Use a more general numerical finite element method using ANSYS software. More detailedness follow: (i)Use dimension, material parameters of piezoelectric transformer model become Electric equivalent circuit, through calculate circuit get properties of piezoelectric transformer, including impedance, voltage gain, efficiency. (ii)Use finite element method simulated three-dimension structure vibration of the piezoelectric transformer. Generally, piezoelectric transformer use EEC Method to model and design, but designer have be unaware of true structure vibration of the piezoelectric transformer. In this thesis, with the help of simulated three-dimension structure vibration of the piezoelectric transformer, let designer more understand piezoelectric transformer. In the same time, keep error design for piezoelectric transformer.
Tang, Yu-Lin, and 湯毓麟. "The Dynamic Analysis of DMFC with A Nonlinear Impedance Equivalent Circuit Model." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/54232566304253438576.
Повний текст джерела北台灣科學技術學院
燃料電池產業研發碩士專班
97
To combine with other power sources is inevitable for direct methanol fuel cell (DMFC) in most applications. The dynamic model of the DMFC for simulating or designing hybrid power system is getting more important with the growing attention to the DMFC in the world. In most present researches, dynamic models of the DMFC follow with differential equations derived from electrochemical principles, so it is relatively difficult to extend applications of these models to simulate or design hybrid power systems or fuel cell stacks. In this thesis, a dynamic equivalent circuit model which is easier to be used to simulate or design the hybrid power system or fuel cell stack is proposed. The equivalent circuit is based on three equivalent circuit models, and discussed by Muller, Randles and Ramesham. In models of Muller and Ramesham, the effect of methanol crossover is neglected. In this thesis, the author proposes a nonlinear impedance module with an inductor in series developed by matching the measured polarization I-V curve. It is found the dynamic characteristics of mass transport effect can be improved in simulations via applying the inductor in series. By using the simulation software tool Matlab/Simulink SimPower module the nonlinear impedance equivalent circuit model is applied to simulate the dynamic response of the DMFC circuit in the mode of step changed output voltage control. A DMFC single cell made of Dupont MEA Nafion®117 with cross sectional area 35cm2 is used to be references of the dynamic model. The simulation results are compared with experi- ments results and found having good coincidence.
Chuang, Shen-Wei, and 莊紳瑋. "Improved Design and Equivalent Circuit Analysis of Flexible Arrayed Dye-Sensitized Solar Cell." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/15362230772822540062.
Повний текст джерела國立雲林科技大學
電子工程系
102
In this thesis, the dye-sensitized solar cell (DSSC) was fabricated on flexible indium tin oxide/polyethylene terephthalate (ITO/PET), and investigated effect of different designed and arrayed. Firstly, flexible arrayed dye-sensitized solar cell was fabricated as mutual electrolyte structure. Part of conductive thin films was etched that opportunity for electrolyte to contact ITO thin films was reduced, and interface impedance was reduced. According to experimental results, when distance between the electrodes was 1 mm obtained optimal, which the open circuit voltage (VOC) was 0.81 V, the short circuit current density (JSC) was 1.70 mA/cm2, and the photovoltaic conversion efficiency was 0.37 %. Transmittance of transparent conductive substrate via etching was increased, which was found in previous experiments. So that designed different distances electrodes and investigated relation of transmittance. Optimal distance of comb-electrodes was 1 mm, which the open circuit voltage was 0.77 V, the short circuit current density was 1.20 mA/cm2, the fill factor (F. F.) was 46 % and the photovoltaic conversion efficiency was 0.43 %, and the transmittance was improved about 15 %. The most significant feature of the flexible substrate is bendable, but its packaging characteristic was poor. In further, the dye-sensitized solar cell produced leaking electrolyte, so the characteristic of dye-sensitized solar cell was investigated with different compressions for packaging. The optimal compression of packaging was 4 kgf/cm, which the lowest loss weight ratio (LWR) was 0.46%.
Bansiwal, Ashok. "Equivalent Circuit Analyses and Methods to Enhance Bandwidth of Klystron Reentrant Cavities." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4659.
Повний текст джерелаDefense Research and Development Organization (DRDO)
Yang, Cheng-Jung, and 楊承融. "Optoelectronic Characteristics and Equivalent Circuit Analysis of Arrayed Electrochromic Display Based on Tertiary Colors." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/31546042838835453653.
Повний текст джерела國立雲林科技大學
電子工程系
102
In this thesis, the poly(3-methylthiophene) (PMeT) and the polyaniline (PANI) of the electrochromic thin films had been deposited on the zinc oxide nanowires/indium tin oxide/glass (ZnO nanowires/ITO/Glass) substrate by cyclic vltammetry (CV). First, the ZnO seed-layer was deposited on ITO/Glass by RF sputtering to investigate uniformity with different deposition mothods. Second, the ZnO nanowires were grown on the ZnO seed-layer by chemical bath deposition (CBD), which were investigated aspect ratio for different growth time. The PANI and PMeT thin films were deposited on ITO/Glass and ZnO nanowires/ITO/Glass by cyclic vltammetry. The electrochromic thin films ZnO nanowires/ITO/Glass was analyzed optical and electrochemical properties by photonic spectrometer, electrochemical impedance spectroscopy (EIS) and cyclic vltammetry, we found that the PANI and PMeT thin films was deposited for 9 hours on ZnO nanowires/ITO/Glass, which have the best transmittance variation (∆T550 nm=38 %) and optical density change (∆OD550 nm = 0.462), and the response time are 10 sec (T550 nm), 24 sec (T450 nm) and 28 sec (T650 nm). The chromaticity coordinates of PANI and PMeT thin films which deposited on ITO/Glass has the best shape of tracks.
Chang, Meng-Ting, and 張孟婷. "Analysis of Spectrum and Discharging Behavior of Lithium-ion Battery Using Equivalent Circuit Model." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/51394267058925332726.
Повний текст джерела國立臺灣大學
應用力學研究所
102
Many studies of lithium-ion battery (LIB) has been carried out because of the wide use of it. Cost reduction, performance improvement, increase of power, excellent cycle life along with high safety are the main targets of those studies. During the process of LIBs research, it is important to inspect the inner condition of LIBs by making battery examinations. Electrochemical Impedance Spectroscopy (EIS) is one of the commonly used examinations, which is a nondestructive testing and famous for its rapidity. In this thesis, the EIS measurement was performed to obtain the spectra of LIBs. In addition, we simulated the spectra through the equivalent circuit model (ECM) of LIBs. In order to simulate the spectra precisely, we established a simulation method based on electrochemistry and mathematics. Besides, the parameters of the ECM, which were obtained from the simulation results, were analyzed and studied for understanding the effects on the impedance of LIBs caused by different experimental settings. Furthermore, one of the parameters in the ECM helped us gain an important electrochemical parameter--the diffusion coefficient of lithium-ion, which was critical for establishing electrochemical model of LIBs. The equivalent circuit model of LIBs could be further used to simulate the discharging behavior of LIBs. We also provided a method for estimating open-circuit voltage (OCV) of LIBs. This method could successfully predict the OCV of LIBs and thus decrease the time consumed during OCV measurement.
WANG, SHI-JIE, and 王世杰. "Steady-state analysis of induction motors by a combined finite element-equivalent circuit method." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/93099151918966892925.
Повний текст джерелаMukherjee, Pritam. "Construction Of Equivalent Circuit Of A Single Isolated Transformer Winding From Frequency Response." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/2055.
Повний текст джерелаMukherjee, Pritam. "Construction Of Equivalent Circuit Of A Single Isolated Transformer Winding From Frequency Response." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2055.
Повний текст джерелаChen, Yi-Shien, and 陳逸仙. "900/1800MHz dual-band ceramic chip antenna bandwidth improvement and equivalent circuit simulation and analysis." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/72864772524722411677.
Повний текст джерела國立成功大學
電機工程學系碩博士班
93
Abstract The designs of dual-band and small antennas are widely proposed in national/international microwave conferences and academic journals.[1][2] It reveals that these two kinds of design already become important trend. Because of reducing antenna size, the antenna bandwidth would decrease. In this thesis, we take advantage of Low Temperature Co-fired Ceramic[3][4]to realizeλ/4 helical antenna instead of λ/4 monopole and hope to minimize antenna size.(antenna size= 13mm*5.25mm*1.2mm) Then we add monopole in theλ/4 helical antenna. In this way,this kind of antenna would have two independent resonance paths to produce dual-band operation .Then we add another two parasitic antenna to enhance the second mode bandwidth and adjust these three monopole antenna length and the distance of each other .Trying to make these two mode closer in high band for wider bandwidth effect. This skill could make the second mode bandwidth of our chip antenna to achieve 360MHz(could cover DCS band)[5].The average gain in low band is-6.23dBi and the average gain[6] in high band is -6.56dBi.In this way, the chip antenna could fit to these two kinds of trend. At the same time, we set up equivalent circuit modal according to transmission line theory. We hope the circuit modal could analyze the chip antenna correctly and expect to acquire more information of the antennas operation principles through the discussions of circuit models. We could take advantage of circuit modal to predict chip antenna practical measurement and strengthen circuit modal function in antenna design to reduce fabrication times and E-M simulation mistake and error. * Student: Yi-shien Chen ** Advisor: Wen-Shi Lee
ASTORINO, MARIA DENISE. "Wideband equivalent-circuit model analysis, realization and time-domain spectroscopy characterization of terahertz periodic metamaterial devices." Doctoral thesis, 2019. http://hdl.handle.net/11573/1223931.
Повний текст джерелаWijeweera, Don Gayan Prabath. "Development of an equivalent circuit of a large power system for real- time security assessment." 2016. http://hdl.handle.net/1993/31927.
Повний текст джерелаFebruary 2017
Huang, Ghi-Hong, and 黃志宏. "Unique Determination of the Small-signal Equivalent Circuit & Analysis of the Large-signal Behavior for Uniform-Doped MESFET." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/44177097433593500203.
Повний текст джерелаJhang, Wun-Siang, and 張文祥. "Analysis and Establishment of the Equivalent Circuit Model for the Single-Phase Brushless DC Motor by Finite-Element Method." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/28528673842380617409.
Повний текст джерела國立雲林科技大學
電機工程系碩士班
94
The thesis mainly uses the finite-element method (FEM) to simulate the properties of magnetic fields and electrical circuits for the single-phase brushless dc motor. In addition, the author makes the complete analysis for the inductance of the motor and utilizes the related results computed by FEM to establish three kinds of simulation models for the motor driving system. In the analyses of magnetic fields and electrical circuits, the distribution of static magnetic fields and the waveform of the cogging torque are simulated. Then the properties of electrical circuits including the inductance, back EMF voltage, and the actual condition of the motor operated at constant speed are simulated. The simulation results of electrical circuits are compared with the measurement results in order to understand the accuracy of the simulation. In addition, a single-phase brushless dc motor needs the asymmetric stator structure to obtain the starting torque, so the thesis also discusses the further effect of the asymmetric stator. In the former analysis of the inductance, it doesn’t consider the effects of the rotor angle and coil current, so the author makes the further analysis about their affection. The symmetric condition of the magnetic fields is utilized to derive the corresponding results in order to reduce the computing time of simulation. At last, the related results computed by FEM are used to establish the three kinds of simulation models for the single-phase brushless dc motor driving system. The simulation results for the three kinds of models are finally compared with the measurement results and the comparative accuracy among them can be obtained from the related comparison.
Chen, Huang-Hua, and 陳皇華. "Fabrication of Dye-Sensitized Solar Cells with Modified Photoelectrode by Ag, GO, TiO2 Fibrous Nanocomposites and EIS Measurement as well as Equivalent Circuit Analysis." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/cz4634.
Повний текст джерелаLIN, YU-JEN, and 林俞任. "Investigation on Equivalent Circuit Analysis of Large-area Arrayed TiO2/ZnO Dye-sensitized Solar Cell Modified by Graphene Integrated with Magnetic Beads and Study on Wireless-based Remote Real-time Monitoring System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/rsa2ju.
Повний текст джерелаLIN, SI-HONG, and 林思宏. "The Study of Differential Reference Electrodes on Characteristics and Equivalent Circuit Impedance Analysis of the Flexible Arrayed Glucose and Ascorbic Acid Biosensors Based on AZO and ZnO Modified by Magnetic Beads and Graphene Oxide, and Integrated with Microfluidic Framework, and the Design of Readout Circuit." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/v2cgb5.
Повний текст джерела國立雲林科技大學
電子工程系
107
In this thesis, the silver reference electrodes and conductive wires were printed onto a polyethylene terephthalate substrate (PET) by using screen printing technology. Next, aluminium-doped zinc oxide (AZO) or zinc oxide (ZnO) was deposited onto the silver electrodes by using the vacuum radio frequency (RF) sputtering system. The enzyme like glucose oxidase (GOx) or ascorbate oxidase (AO) was immobilized on the AZO or ZnO membranes to fabricate the glucose biosensor or the ascorbic acid biosensor, respectively. After that, graphene oxide (GO) and magnetic beads (MBs) were used to modify the sensing membranes. In terms of the analysis of sensing characteristics, average sensitivity, linearity, response time, limit of detection, drift, hysteresis, interference, lifetime, and temperature effects were investigated. Moreover, electrochemical impedance spectroscopy (EIS) was used to analyze the electrochemical impedance of different membranes. Finally, the sensing characteristics of the biosensor integrating with the microfluidic framework were analyzed, and the wireless sensing system based on ZigBee protocol integrating the biosensor was applied to realizing remote monitoring.
Zu-Cheng, Li, and 黎祖成. "A Comprehensive Parasitic RLC Extraction Method and Equivalent Circuit Model for High Frequency and RF Noise Analysis and Simulation in Multi-finger and Multi-ring nMOSFETs with Layout Dependent and Technology Scaling Effects." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/e538m3.
Повний текст джерела國立交通大學
電子研究所
107
In this thesis, an extensive investigation has been carried out on the layout dependent effects in multi-finger (MF) and multi-ring (MR) nMOSFETs, and the impact on high frequency performance like most importantly unit gain cut-off frequency fT and maximum oscillation frequency fMAX, as well as RF noise in nanoscale CMOS technologies. A comprehensive extraction flow has been developed for accurate determination of the intrinsic device parameters as well as intrinsic parasitic resistances, inductances, and capacitances (RLC), which are key parameters governing fT and fMAX, and RF noise like NFmin and Rn. The impact of technology scaling on high frequency device parameters and performance appears as another critically important topic. In this thesis, 90nm and 40nm CMOS technologies from TSMC, namely TN90GUTM and TN40G have been adopted for MF and MR nMOSFETs design and fabrication. The aggressive scaling of layout rule and physical dimensions like poly gate length (Lg), poly gate thickness (TPO), contact plug thickness (TCO), and metal thickness (TM1) by around 52~60%, gate oxide thickness (Tox) by around 84%, and PO-to-CO space (LPO-CO) by 42~43% from TN90GUTM to TN40G will lead to complicated influence on the intrinsic device parameters, intrinsic parasitic RLC, and more importantly high frequency performance. Basically, the shrinkage of Lg, TPO, TCO, TM1, and layout dimensions can lead to the increase of gate resistance (Rg), contact resistance, and source parasitic resistance as well as inductance (RS and LS,int) in MF devices with extended source line, all of which may cause the penalties such as degradation of transconductance (gm), fT and fMAX, and even worse the increase of RF noise (Rn and NFmin). On the other hand, the scaling of Lg, TPO, TCO, and TM1 can help suppress the intrinsic parasitic capacitances like gate sidewall and finger-end fringing capacitances (Cof and Cf(poly-end)) and achieve smaller gate capacitance (Cgg). The experimental results indicate that more aggressive scaling in Lg than Tox (or Tox(inv)) can achieve higher gm and smaller Cgg, and thus significant boost of fT by around 60 ~110% in MF nMOSFETs attributed to technology scaling from TN90GUTM to TN40G. However, the higher fT cannot guarantee the higher fMAX because that the dramatic increase of Rg may overwhelm the advantage of fT and result in similar or even lower fMAX. It means that the complicated trade-off between the parasitic RLC associated with technology scaling and layout dependent effects becomes a valuable and challenging topic for high frequency devices design, parasitic RLC extraction, and equivalent circuit modeling. In this thesis, a new method, namely matrix method for accurate extraction of extrinsic source and drain parasitic resistances, RS and RD in MF and MR MOSFETs, has been developed and proven with sufficient accuracy for effective mobility eff extraction in MF and MR nMOSFETs associated with TN90GUTM and TN40G technologies. This matrix method can accurately determine the current through every active channel (OD) finger and voltage at each source finger terminal, and thus solve the problem from previous assumption of uniform current distribution and equal source terminal voltage at every finger. The mentioned assumption may lead to sever over-estimation of extrinsic RS and an abnormal jump of eff extracted from MF nMOSFETs in case of larger finger number (NF). This problem becomes particularly worse in TN40G technology than TN90GUTM, due to the aggressive scaling of TM1~M3 and TCO, as well as significant increase of the metal sheet resistance and contact resistance (RCO). Furthermore, how to determine the physical Rg and real Rg through high frequencies responsible for fMAX, Rn, and NFmin becomes a challenging topic of controversy, particularly for MF and MR devices with extremely narrow finger width (WF) in case of very large NF. MR devices proposed as a solution for higher eff attributed to suppression of STI compressive transverse stress ⊥. However, some potential problems like the increase of Rg, Cof, and Cf(poly-end) may be detrimental to fT, fMAX, and RF noise (Rn, and NFmin). Some innovative MR layouts for simultaneous reduction of Rg, Cof, and Cf(poly-end) emerge as another topic worthy of further study. In addition, the intrinsic parasitic inductances like Lg,int, Ld,int, and Ls,int appear as critical elements with sophisticated layout dependence and influence on high frequency parameters, which are dispensable for actual intrinsic MOSFET models for high frequency simulation aimed at mm-wave circuits design. Finally, the actual intrinsic MOSFET models can be integrated with our proprietary lossy substrate model to build up a full equivalent circuit model for both high frequency and RF noise simulation prior to deembedding. However, the aggressive thickness reduction of the stacked metal layers and inter-metal dielectric in technology scaling from TN90GUTM to TN40G causes dramatic increase of parasitic capacitances associated with the GSG pads and interconnection lines from the pads to the core devices. This kind of extrinsic parasitic capacitances may overwhelm the intrinsic channel and frigning capacitances (Cgg,int, Cof,, and Cf(poly-end)), which may lead to very minor difference between various MF layouts and difficulty in open deembedding. As a result, the intrinsic Y-parameters reveal anomalous frequency dependence and reverse of positive/negative sign. It emerges as a new challenge to precise deembedding and suggests more extensive research effort in the future for effective reduction of the extrinsic parasitic capacitances. To the end, our proprietary lossy substrate deembedding method can be applied for accurate extraction and simulation of intrinsic RF noise in MF and MR devices associated with TN90GUTM and TN40G technologies. This way can eliminate the problems of conventional noise correlation matrix method and facilitate device layouts optimization for high frequency and low noise design in nanoscale CMOS technologies.
(9755702), Tyler James Shelly. "PARAMETRIC ANALYSIS AND OPTIMIZATION OF LONG-RANGE BATTERY ELECTRIC VEHICLE THERMAL MANAGEMENT SYSTEMS." Thesis, 2020.
Знайти повний текст джерелаDue to increasing regulation on emissions and shifting consumer preferences, the wide adoption of battery electric vehicles (BEV) hinges on research and development of technologies that can extend system range. This can be accomplished either by increasing the battery size or via more efficient operation of the electrical and thermal systems. This thesis endeavours to accomplish the latter through comparative investigation of BEV integrated thermal management system (ITMS) performance across a range of ambient conditions (-20 °C to 40 °C), cabin setpoints (18 °C to 24 °C), and six different ITMS architectures. A dynamic ITMS modelling framework for a long-range electric vehicle is established with comprehensive sub models for the operation of the drive train, power electronics, battery, vapor compression cycle components, and cabin conditioning. This modelling framework is used to construct a baseline thermal management system, as well as for adaptation to four common systems. Additionally, a novel low-temperature waste heat recovery (LT WHR) system is proposed and shown to have potential benefits at low ambient temperatures through the reduction of the necessary cabin ventilation loading. While this system shows performance improvements, the regular WHR system offers the greatest benefit for long-range BEV drive cycles in terms of system range and transient response. With an optimal thermal management system found for long range BEV’s this system is then used as a boundary condition for a study on cooling of the battery. Battery conditioning, health, and as a result their along cell and system lifetime remains an additional concern of consumers as well as thermal systems engineers seeking to ensure safety and ensure longevity of EV battery cells. Three typical coolant flow orientations are studied to compare them under different flow conditions and thermal interface material performance. The battery cooling model is then coupled to the previously established dynamic modelling environment to demonstrate the added modelling capability (and necessity) for incorporating module-level cooling performance in both battery cooling studies and transient ITMS environments.
Tang, X., Qichun Zhang, X. Dai, and Y. Zou. "Neural membrane mutual coupling characterisation using entropy-based iterative learning identification." 2020. http://hdl.handle.net/10454/18180.
Повний текст джерелаThis paper investigates the interaction phenomena of the coupled axons while the mutual coupling factor is presented as a pairwise description. Based on the Hodgkin-Huxley model and the coupling factor matrix, the membrane potentials of the coupled myelinated/unmyelinated axons are quantified which implies that the neural coupling can be characterised by the presented coupling factor. Meanwhile the equivalent electric circuit is supplied to illustrate the physical meaning of this extended model. In order to estimate the coupling factor, a data-based iterative learning identification algorithm is presented where the Rényi entropy of the estimation error has been minimised. The convergence of the presented algorithm is analysed and the learning rate is designed. To verified the presented model and the algorithm, the numerical simulation results indicate the correctness and the effectiveness. Furthermore, the statistical description of the neural coupling, the approximation using ordinary differential equation, the measurement and the conduction of the nerve signals are discussed respectively as advanced topics. The novelties can be summarised as follows: 1) the Hodgkin-Huxley model has been extended considering the mutual interaction between the neural axon membranes, 2) the iterative learning approach has been developed for factor identification using entropy criterion, and 3) the theoretical framework has been established for this class of system identification problems with convergence analysis.
This work was supported in part by the National Natural Science Foundation of China (NSFC) under Grant 51807010, and in part by the Natural Science Foundation of Hunan under Grant 1541 and Grant 1734.
Research Development Fund Publication Prize Award winner, Nov 2020.
KO, CHENG-CHU, and 柯承初. "Investigation of Photovoltaic Properties and Equivalent Circuit Impedance Analysis for Dye-sensitized Solar Cell Based on AZO Photoanode and Pt Counter Electrode Modified by Reduced Graphene Oxide under Low Illumination, and Study in Series-Parallel Connection Modules." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/86nyah.
Повний текст джерела國立雲林科技大學
電子工程系
107
In this thesis, the dye-sensitized solar cells (DSSCs) were fabricated on fluorine doped tin oxide (FTO) glass or flexible indium tin oxide/ polyethylene terephthalate (ITO/PET). The photoanode was double layer structure. Firstly, we deposited the Al-doped zinc oxide (AZO) seed layer on FTO glass by sputter system and then grew the zinc oxide (ZnO) nanorods on the AZO seed layer by hydrothermal method. Finally, we deposited the titanium dioxide (TiO2) on ZnO nanorods by the doctor blade method, the photoanode had been finished. The ZnO nanorods could increase the dye adsorption. In the other part, the platinum (Pt) modified is by reduced graphene oxide (rGO). The rGO is two-dimensional materials, which has a high surface and area-to-volume ratio. The rGO was deposited on platinum counter electrode by the doctor-blade method and it can enhance the electrocatalytic activity of the counter electrode. Finally, we measured the current density-voltage curves of the dye-sensitized solar cell (DSSCs), used electrochemical impedance spectroscopy (EIS) to measure impedance and used field emission scanning electron microscopy (FE-SEM) to observe surface morphology of the DSSCs. This new structure could make dye absorbed in a photoanode increase. We know the current situation by ultraviolet-visible spectroscopy. Consequently, This produced an increase in the photoanode ability to absorb the dye, which in turn increased the cell’s short circuit current density, raising the photovoltaic conversion efficiency from 3.71% to 4.87%. In addition, we made the DSSCs module which connected 2 devices in series and 2 devices in parallel and performed the stability analysis. In addition, The DSSCs was measured under the different light intensities. Corresponding to the results, when the light intensity was reduced from 100 mW/cm2 to 30 mW/cm2, the fill factor and the photovoltaic conversion efficiency were increased from 52.85 % to 63.45 % and 4.01 % to 5.25 %, respectively. The photovoltaic conversion efficiency was grown up to 7.82 % when the DSSCs were operated under T5 fluorescent light which light intensities were 0.2 mW/cm2 - 1.7 mW/cm2.
YOU, PEI-HONG, and 游培弘. "Investigation on the Photovoltaic Characteristics of Flexible Arrayed TiO2 Dye-sensitized Solar Cell Modified by Graphene and Magnetic Beads Integrated with ZnO Nanowires under the Low Illumination and Study on Impedance Analysis of Large-area Series-parallel Equivalent Circuit." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/xc2mb5.
Повний текст джерела國立雲林科技大學
電子工程系
105
In this thesis, we focused on the performance improvement of dye-sensitized solar cell (DSSC). First, the zinc oxide nanowires was deposited on the different substrates by using water bath method, such as fluorine-doped tin oxide/glass (FTO/Glass) substrate and the indium tin oxide/polyethylene terephthalate (ITO/PET) substrate. After that, the different contents of graphene oxide (GO) and magnetic beads (MBs) were incorporated into titanium dioxide, which will be deposited on the zinc oxide nanowires film by using spin coating method. The optimal incorporating ratio of GO-MBs-TiO2/ zinc oxide nanowires is investigated for the photoelectrode. On the other hand, we also analyzed the series-parallel connection modules and the effects of low illumination for the photovoltaic properties of DSSC. For optimal device, the surface morphology, film thickness, crystalline phase, the optical and photoelectric properties of composite film will be investigated by scanning electron microscope (SEM), X-ray diffractometer (XRD), UV-visible spectroscopy (UV-vis) and electrochemical impedance spectroscopy (EIS). According to the experimental results, the content of 1.5 mL GO and 0.5 mL MBs for DSSC had the optimal photovoltaic properties performances. The optimal photovoltaic conversion efficiency (η) was 4.46 %. Finally, the DSSC of optimal composite film was investigated under different light intensities, which achieved the higher η of 5.21 % a 10 mW/cm2 illumination. The impedance decreased/increased with the increasing connections of the parallel/series module, which photovoltaic conversion efficiencies were 2.81 % and 4.21%, respectively. When use the large area module (2 series + 2 parallel), which η was 3.02%. The optimal η was 3.93% under 10 mW/cm2 illumination.