Дисертації з теми "Lumped and Distributed-Lumped modelling"
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Oh, Min. "Modelling and simulation of combined lumped and distributed processes." Thesis, Imperial College London, 1995. http://hdl.handle.net/10044/1/8197.
Повний текст джерелаMejuto, Carlos. "Improved lumped parameter thermal modelling of synchronous generators." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4612.
Повний текст джерелаGrobler, Andries Johannes. "Thermal modelling of a high speed permanent magnet synchronous machine / Andries J. Grobler." Thesis, North-West University, 2011. http://hdl.handle.net/10394/6528.
Повний текст джерелаThesis (Ph.D. (Electrical Engineering))--North-West University, Potchefstroom Campus, 2011.
Alkaragoolee, Mohammed Y. A. "Hybrid Modelling and Optimisation of Oil Well Drillstrings." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/16859.
Повний текст джерелаIraqi Government, Ministry of Higher Education and Scientific Research.
Dimitriou, Vanda. "Lumped parameter thermal modelling for UK domestic buildings based on measured operational data." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23239.
Повний текст джерелаShi, Yubing. "Lumped-parameter modelling of cardiovascular system dynamics under different healthy and diseased conditions." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4198/.
Повний текст джерелаSiushansian, R. "Finite-volume time-domain modelling of complex geometries and lumped elements in generalised coordinate systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0020/NQ58191.pdf.
Повний текст джерелаZhang, Shilong. "Lumped-parameter modelling of elastically coupled bodies: Derivation of constitutive equations and determination of stiffness matrices." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284462.
Повний текст джерелаMkadara, Geneviève, and Jean-Charles Maré. "Development of a lumped parameter model of an aerospace pump for condition monitoring purposes." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71205.
Повний текст джерелаRing, Emma. "Modelling a piezoelectric-driven actuator for active flow control." Thesis, Linköpings universitet, Reglerteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-114957.
Повний текст джерелаFilippou, Sotirios. "Virtual sensor for air mass flow measurement in an SI engine: Application of distributed lumped modelling in prediction of air mass flow into the cylinder of SI combustion engines." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17450.
Повний текст джерелаSvensson, Oskar. "Electrohydraulic Power Steering Simulation : Dynamic, thermal and hydraulic modelling." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265674.
Повний текст джерелаDet finns flera fördelar med elektrohydraulisk servostyrning, där hydraulpumpen drivs av en el-motor, jämfört med hydraulisk servostyrning, där pumpen drivs direkt av fordonets förbränningsmotor. Några av dessa fördelar är ökad effektivitet och förbättrad styrprestanda. Syftet med detta projekt är att skapa en Simulink-modell av ett elektrohydraulisk system för servostyrning, exklusive hydraulkretsen. Modellen ska alltså bestå av delmodeller för elmotorn, drivelektroniken, styrsystemet, hydraulpumpen samt kommunikation med den övergripande simuleringsplattformen.Inledningsvis beskrivs en matematisk modell av elmotorn och efter det utvecklas motorstyrningen, bestående av två strömregulatorer samt en hastighetsregulator. Spänningen från strömregulatorerna uppnås genom space vector-modulation, som beräknar de pulskvoter som krävs för att uppnå denna spänning. Elmotorn driver en pump. Denna pump modelleras med hjälp av data från pumpens datablad. Slutligen modelleras drivelektronikens termiska egenskaper med ett termiskt nätverk. Den slutliga modellen omsluts av en Functional Mock-up Unit somintegreras i den övergripande simuleringsplattformen.
Holmberg, Pär. "Modelling the transient response of windings, laminated steel coresand electromagnetic power devices by means of lumped circuits : With special reference to windings with a coaxial insulation system." Doctoral thesis, Uppsala University, Department of High Voltage Research, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-548.
Повний текст джерелаElectromagnetic transients impinging on electromagnetic power devices - such as electric machines, transformers and reactors - can stress the design severely. Thus the magnitudes of the transients are often decisive for the design of the devices. Further, the operation of a device can be transient in itself. This is the case for the explosive magnetic flux compression generator (EMG) and a ferromagnetic actuator.
Models are presented that are mainly intended for transients in the millisecond range and faster. Hence, eddy currents and the related skin and proximity effect become significant in windings, magnetic cores and in the armatures of the devices. These effects are important for, e.g., the damping of the transients. Further, the displacement current in the insulation of the winding is significant. It changes the response of the windings dramatically, as it manifests the finite velocity of propagation of the electromagnetic fields. Under such circumstances, reflections and excited resonances can make the transient voltage and current distribution highly irregular.
Induced voltages are modelled with self and mutual inductances or reluctances combined with winding templates. The displacement currents are modelled with capacitances or coefficients of potential. Cauer circuits and their dual form are used to model eddy currents in laminated cores and in conductors. The Cauer circuit enables one to consider hysteresis and the non-linear response of a magnetic core. It is also used to model the eddy currents in the moving armature of an EMG.
A set-up is presented that can be used to study the transient voltage and the current distribution along a coil.
The transient response of coaxially insulated windings is analysed and modelled in detail. A lumped circuit model is developed for a coil, DryformerTM - the new high-voltage transformer - and PowerformerTM, the new high-voltage generator. An alternative model, a combined lumped circuit and FEM model, is presented for a coaxially insulated winding in two slot cores.
Holmberg, Pär. "Modelling the transient response of windings, laminated steel cores and electromagnetic power devices by means of lumped circuits : with special reference to windings with a coaxial insulation system /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2000. http://publications.uu.se/theses/91-554-4877-1/.
Повний текст джерелаLakhanpal, Chetan. "Mathematical modelling of applied heat transfer in temperature sensitive packaging systems. Design, development and validation of a heat transfer model using lumped system approach that predicts the performance of cold chain packaging systems under dynamically changing environmental thermal conditions." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/5776.
Повний текст джерелаInalpolat, Murat. "Determination Of Vibroacoustical Behavior Of Plates By Intensity Methods." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605095/index.pdf.
Повний текст джерелаJohn, Yakubu M. "Kinetic modelling simulation and optimal operation of fluid catalytic cracking of crude oil: Hydrodynamic investigation of riser gas phase compressibility factor, kinetic parameter estimation strategy and optimal yields of propylene, diesel and gasoline in fluid catalytic cracking unit." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17323.
Повний текст джерелаKolhatkar, Tanmay. "Nonlinear dynamic interactions between a rigid attachment bolted to a thin-walled sheet metal structure." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587124580918153.
Повний текст джерелаBek, Jeremy. "Design, simulation, and testing of an electric propulsion cluster frame." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-300970.
Повний текст джерелаGenerellt erbjuder elektrisk framdrivning hög verkningsgrad men relativt låg dragkraft. För att avhjälpa detta kan flera jonmotorer sättas samman i en klusterkonfiguration och drivs parallellt. Detta kräver en noggrann utformning av en ram för att rymma de enskilda framdrivningssystemen. Denna ram måste vara modulär för att kunna användas i olika klusterstorlekar och verifiera termiska och mekaniska krav för att säkerställa den nominella driften av motorerna. Föreliggande rapport syftar till att visa designprocessen för en sådan ram, från preliminär modellering till experimentell studie av en prototyp. Detta dokument innehåller en översikt över den iterativa designprocessen, driven av termiska simuleringar gjorda med COMSOL Multiphysics, som ledde till uppfattningen av en 2 motorer och 4 motorer ram. En klumpelementmodell av jonmotorn skapades också för att modellera dess komplexa termiska beteende. Dessutom var den 2 motorer ram studeras mekaniskt med analytiska beräkningar och simuleringar av enkla laddafall med SolidWorks. Slutligen monterades en prototyp baserad på den 2 motorer rammodellen. Prototypen användes för att göra temperaturmätningar medan den är värd för 2 jonmotorer i en vakuumkammare. Temperaturfördelningen i klustret mättes och jämfördes med simuleringsresultat. Termiska simuleringar av den 2 motorer och 4 motorer ramen visade lovande resultat, medan mekaniska simuleringar av den 2 motorer versionen klarade alla krav. Dessutom överensstämde experimentella resultat till stor del med termiska simuleringar av prototypen. Slutligen var klumpelementmodellen mycket användbar för att kalibrera de andra modellerna med sin höga flexibilitet och snabba beräkningstid.
Orellana, Bobadilla Barbara A. "Identification of lumped and semi-distributed conceptual rainfall runoff models." Thesis, Imperial College London, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590036.
Повний текст джерелаVENTURINI, VIRGINIA. "A NEW METHODOLOGY TO INTEGRATE PARAMETERS IN LUMPED MODELS." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1006882648.
Повний текст джерелаLaoubi, Yanis. "Modélisation des machines électriques par les réseaux de perméances génériques : cas des machines à flux axial." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMLH17.
Повний текст джерелаThe aim of this PhD thesis is to propose a design approach of the axial flux permanent magnet synchronous generator for multi megawatts wind converter application. The axial flux permanent magnet synchronous machine being intrinsically three dimensional, a 3D multiphysics sizing model is needed in order to conduct an efficient optimal design of this type of machines. Unfortunately, 3D multiphysic models are generally issued from finite element method. So, they are very heavy to be handled in a reduced time from an engineer point of view and especially at the first stages of the design procedure. In order to address the faster axial flux machine design, this PhD thesis develops a lumped parameters approach modelling offering a good computation time to precision ratio and thus helping to reduce considerably the spent time in the first stages design procedure. The lumped parameters modelling approach is also well suited for the modelling of the three main physics to be considered in an electrical generator (magnetic model, thermal model and mechanical model). For the magnetic model, the lumped parameters approach consists, in this thesis, in the development of a generic magnetic reluctance network linked to the machine geometry. In fact, the latter is divided into parallelepipedic elementary volumes, each of them is modelled by a local reluctance network. The reluctance network of the hole machine geometry results then automatically in an algebraic magnetic system, the solution of which provides the distribution of the scalar magnetic potential at the elementary volume nodes. The described lumped parameters modelling was implemented in a computational code developed at the GREAH Lab. The effectiveness of the reluctance network axial flux machine modelling was validated by 2D and 3D finite element simulations. The lumped parameters computational code will regroup the ongoing developments of thermal and mechanical models at the GREAH Lab in order to reach the completion of a mutliphysics lumped parameters computational code
Muhammad, Zakir Hossain. "High resolution ultrasonic monitoring of muscle dynamics and novel approach to modelling." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-102502.
Повний текст джерелаPerez, Javier Rodriguez. "A hybrid strategy for improved state estimation in nonlinear lumped and distributed parameter models." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516501.
Повний текст джерелаPaudel, Murari. "An Examination of Distributed Hydrologic Modeling Methods as Compared with Traditional Lumped Parameter Approaches." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2219.
Повний текст джерелаBanus, Cobo Jaume. "Coeur & Cerveau. Lien entre les pathologies cardiovasculaires et la neurodégénérescence par une approche combinée biophysique et statistique." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4030.
Повний текст джерелаClinical studies have identified several cardiovascular risk factors associated to dementia and cardiac pathologies, but their pathological interaction remains poorly understood. Classically, the investigation of the heart-brain relationship is mostly carried out through statistical analysis exploring the association between cardiac indicators and cognitive biomarkers. This kind of investigations are usually performed in large-scale epidemiological datasets, for which joint measurements of both brain and heart are available. For this reason, most of these analyses are performed on cohorts representing the general population. Therefore, the generalisation of these findings to dementia studies is generally difficult, since extensive assessments of cardiac and cardiovascular function in currently available dementia dataset is usually lacking. Another limiting factor of current studies is the limited interpretability of the complex pathophysiological relations between heart and brain allowed by standard correlation analyses. Improving our understanding of the implications of cardiovascular function in dementia ultimately requires the development of more refined mechanistic models of cardiac physiology, as well as the development of novel approaches allowing to integrate these models with image-based brain biomarkers. To address these challenges, in this thesis we developed new computational tools based on the integration of mechanistic models within a statistical learning framework. First, we studied the association between non-observable physiological indicators, such as cardiac contractility, and brain-derived imaging features. To this end, the parameter-space of a mechanistic model of the cardiac function was constrained during the personalisation stage based on the relationships between the parameters of the cardiac model and brain information. This allows to tackle the ill-posedness of the inverse problem associated to model personalisation, and obtain patient-specific solutions that are comparable population-wise.Second, we developed a probabilistic imputation model that allows to impute missing cardiac information in datasets with limited data. The imputation leverages on the cardiac-brain dynamics learned in a large-scale population analysis, and uses this knowledge to obtain plausible solutions in datasets with partial data. The generative nature of the approach allows to simulate the evolution of cardiac model parameters as brain features change. The framework is based on a conditional variational autoencoder (CVAE) combined with Gaussian process (GP) regression. Third, we analysed the potential role of cardiac model parameters as early biomarkers for dementia, which could help to identify individuals at risk. To this end, we imputed missing cardiac information in an Alzheimer's disease (AD) longitudinal cohort. Next, via disease progression modelling we estimated the disease stage for each individual based on the evolution of biomarkers. This allowed to obtain a model of the disease evolution, to analyse the role of cardiac function in AD, and to identify cardiac model parameters as potential early-stage biomarkers of dementia. These results demonstrate the importance of the developed tools by providing clinically plausible associations between cardiac model parameters and brain imaging features in an epidemiological dataset, as well as highlighting insights about the physiological relationship between cardiac function and dementia biomarkers. The obtained results open new research directions, such as the use of more complex mechanistic models that allow to better characterise the heart-brain relationship, or the use of biophysical cardiac models to derive in-silico biomarkers for identifying individuals at risk of dementia in clinical routine, and/or for their inclusion in neuroprotective trials
Yevseienko, Oleg, Anatoliy Gapon, and Dmytro Salnikov. "Searching for Optimal Control Parameters of Thermal Object Using Pulse-Width Modulation (PWM) Control with Predictive Filter." Thesis, Lviv Polytechnic Publishing House, 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41116.
Повний текст джерелаOksar, Irfan. "Design And Realization Of Mixed Element Broadband Bandpass Filters." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1092964/index.pdf.
Повний текст джерелаis used to synthesize the trial filters. More than forty filters are synthesized, and among them, the ones that have better properties are chosen for further processes. Optimization, modeling and electromagnetic simulations of the selected lumped and distributed filters are carried out on the software GENESYS&trade
. Distributed filters are also simulated using the software SONNET&trade
. After the simulations, all of the simulated filters are realized and measured, and the level of consistency with the simulations is observed. According to the results of the measurements, the filter combination that has the best combination of low insertion loss, small dimensions, high stopband attenuation and low spur levels is selected for the final bandpass filter structure and a few variants are examined to get the final structure.
Tratkanov, Dimitri. "Méthodes géométriques et énergétiques pour la modélisation et la simulation des systèmes multi-physiques en génie électrique." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2562.
Повний текст джерелаThis PhD thesis deals with modeling and computational methods for the design of multi-physical devices in the context of Model-Based System Engineering (MBSE). The proposed methods are based on geometric and topological tools (differential and algebraic topology) as well as duality theory (energetic and differential forms) and advanced discretization and meshing techniques (Delaunay- Voroinoi mesh and computer graphics tools). Analogies so useful in multi-physics modeling are widely used in this work through Tonti's perspective and diagrams. Several standard approaches to engineering modelling are extended and complemented by machine learning and clustering algorithms to provide innovative methods for modeling, simulation and model order reduction. The main contribution of this work concerns a new concept of automated generation of lumped parameter (LP) models from field computations. The results of the field calculations are obtained with a cochain method inspired by the Discrete External Calculus and the Tonti's Cell-Method. This thesis proposes an original approach which generates a LP model and applies at the same time a model order reduction. The two objectives, the automatic generation of the LP model and the model reduction, are based on a topological analysis of the physical problem and Artificial Intelligence clustering algorithms. The final objective of this work is to propose a multi-scale model that can simplify the modeling and simulation of multi-physical devices. This multi-scale model should be suitable for both: solution analysis (computation of fields with the cochain model) and design, optimization, control synthesis (computation of physical quantities in a network of components with the LP model). Field computations are illustrated on a weakly coupled multi-physical case: Electrokinetic, then thermal, and finally mechanical field are computed. Model order reduction and automatic LP generation are illustrated on a magnetostatic case (based on an electromagnetic device): the magnetic H and B fields are calculated using the cochain method, then a reduced reluctance network is automatically generated from the field results. In this example, the number of degrees of freedom is almost reduced by a factor of one hundred
Yayla, Ihsan. "Filter Design Software By Synthesis Method." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610279/index.pdf.
Повний текст джерелаSantos, Franciane Mendonça dos. "Modelagem concentrada e semi-distribuída para simulação de vazão, produção de sedimentos e de contaminantes em bacias hidrográficas do interior de São Paulo." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-26112018-145857/.
Повний текст джерелаThe lack of hydrological data in Brazil is a recurrent problem in many regions, especially in hydrometric data, sediment yield and water quality. The research by simplified models has increased in the last decades, however, the estimation of hydrossedimentological data from these more sophisticated models demands many variables, which must be adjusted for each natural system, which makes it difficult to apply. At times it is necessary to respond quickly without much precision in the results, in these situations, simpler models with few parameters can be the solution. The objective of this research is to evaluate different modelling tools used estimate streamflow, sediments yield and nutrients loads values, and namely to compare the results obtained from a physically-based distributed hydrological model (SWAT) with the results from a lumped hydrological, the Soil Conservation Service (SCS-CN) and the Generalized Watershed Loading Function (GWLF) model. Both models use the curve number (CN) concept, determined from land use, soil hydrologic group and antecedent soil moisture conditions and were run with a daily time step. We are particularly interested in understanding under which conditions the use of each model is to be recommended, namely when does the addition effort required to run the distributed model leads to effective better results. The input variables and parameters of the lumped model are assumed constant throughout the watershed, while the SWAT model performs the hydrological analysis at a small unit level, designated as hydrological response units (HRUs), and integrates the results at a sub-basin level. In relation to the flow simulation, the results of the two models were highly influenced by the rainfall data, indicating that, possibly, faults or measurement errors could have negatively influenced the results. Therefore, it was proposed to apply the distributed model with high-resolution grids of daily precipitation to verify the efficiency of its results when compared to rainfall data. For simulation of sediment, nitrogen and phosphorus, SWAT performs a more detailed simulation and thus provides slightly better results. The use of the SWAT was also extended to simulate the influence of reservoir, in order to verify the potentiality of the model, in relation to the simulation. The models also were used to identify which are potential impacts of the ongoing land use changes. The scenarios were: I - Current scenario, II - trend scenario, with the increase of urban land and replacement of the exposed soil and part of the native forest by agricultural use; III - desirable scenario complements the trend urban growth with the replacement of exposed soil and part of the agricultural use by reforestation. The methodologies were applied on two watersheds located in the Southeast of Brazil. The first one is the Jacaré-Guaçu river basin, included in the Water Resources Management Unit 13 (UGRHI-13), upstream of Cruzes river confluence, with an area of 1934 km2. The second watershed is the Atibaia River Basin, a part of Water Resources Management Unit 5 (UGRHI-5). It has an area of 2817.88 km2 and covers municipalities of the states of São Paulo and Minas Gerais.
Goodpaster, Benjamin A. "Analytical Modeling and Impedance Characterization of Nonlinear, Steady-State Structural Dynamics in Thermomechanical Loading Environments." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524063139635613.
Повний текст джерелаKarisan, Yasir. "Full-wave Electromagnetic Modeling of Electronic Device Parasitics for Terahertz Applications." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1419019102.
Повний текст джерелаWhalley, R., Kambiz M. Ebrahimi, and A. A. Abdul-Ameer. "Hybrid modelling of machine tool axis drives." 2005. http://hdl.handle.net/10454/3951.
Повний текст джерелаThe x-axis dynamics of a milling machine where the workpiece and saddle are mounted on supporting slides is considered. A permanent magnet motor, lead screw, ball nut and bearings are employed as the machine, traverse actuator mechanism. Hybrid, distributed¿lumped parameter methods are used to model the machine tool x-axis drive system. Inclusion of the spatial configuration of the drive generates the incident, travelling and reflected vibration signature of the system. Lead screw interactive torsion and tension loading, which is excited by cutting and input disturbance conditions, is incorporated in the modelling process. Measured and results from simulation exercises are presented in comparative studies enabling the dynamic characteristics of the machine to be identified under, no load and with the application of cyclic, cutting force disturbances. The effect of the lead screw length, cutting speed and hence the load disturbance frequency are examined and the resulting performance accuracy is commented upon.
John, Yakubu M., M. A. Mustafa, Rajnikant Patel, and Iqbal M. Mujtaba. "Parameter estimation of a six-lump kinetic model of an industrial fluid catalytic cracking unit." 2018. http://hdl.handle.net/10454/16539.
Повний текст джерелаIn this work a simulation of detailed steady state model of an industrial fluid catalytic cracking (FCC) unit with a newly proposed six-lumped kinetic model which cracks gas oil into diesel, gasoline, liquefied petroleum gas (LPG), dry gas and coke. Frequency factors, activation energies and heats of reaction for the catalytic cracking kinetics and a number of model parameters were estimated using a model based parameter estimation technique along with data from an industrial FCC unit in Sudan. The estimated parameters were used to predict the major riser fractions; diesel as 0.1842 kg-lump/kg-feed with a 0.81% error while gasoline as 0.4863 kg-lump/kg-feed with a 2.71% error compared with the plant data. Thus, with good confidence, the developed kinetic model is able to simulate any type of FCC riser with six-lump model as catalyst-to-oil (C/O) ratios were varied and the results predicted the typical riser profiles.
Kuo, Tsung-Nan, and 郭宗男. "Compact Distributed-Lumped Microstrip Bandpass Filters." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/98711753512688733592.
Повний текст джерела國立臺灣大學
電信工程學研究所
93
In this study, novel compact distributed-lumped microstrip bandpass filters, based on folded quarter-wavelength(λ/4) resonators, are proposed. Two transmission zeros at upper and lower stopbands are created by introducing a cross-coupling capacitance directly between the input and output ports of a 2nd-order filter. This pair of transmission zeros would not degrade the passband insertion loss and may improve the selectively. In order to achieve good spurious response and small circuit area, suitable open stubs and stepped impedance resonators are adopted in the filter design. The improved results are verified through experiments. Moreover, a novel 4th-order filter is also implemented. By suitably introducing two capacitive cross-coupling paths in the 4th-order filter, improved selectivity and good stopband rejection can be achieved.
chang, Jann-yuan, and 張振源. "Applications of lumped and distributed runoff models in Shihmen reservoir watershed." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/64652349314006819221.
Повний текст джерела國立臺灣海洋大學
河海工程學系
95
Abstract Watershed rainfall-runoff simulation can be classified into lumped routing and distributed routing. The unit hydrograph, which is the hydrologic response function for a unit rainfall input at the watershed outlet, is the well-known lumped model. By using continuity equation and momentum equation, a distributed routing model associated with a conceptual model can simulate the propagation of flood wave in the watershed. The purpose of this study is to investigate the differences in rainfall-runoff simulating using the lumped model and the distributed model. In this study, the HEC-GeoHMS was applied to obtain the stream network, subwatershed boundary, and geomorphic factors. Consequently, the kinematic-wave V-shaped model in the HEC-HMS was applied to perform the runoff routing from a lumped system to distributed systems. The methodology was applied to the upstream watershed of Hsia-Yun, which is located in the Shihmen Reservoir watershed. In performing the lumped and distributed runoff routing, the watershed was divided into 1, 5, 9, and 14 subwatersheds. Hydrological records from four typhoon events were selected for model simulations. The results show that the channel roughness coefficient calibrated by using a distributed model is larger than that calibrated by using a lumped model. Moreover, the roughness coefficient calibrated in the upstream subwatersheds is larger than that obtained from the downstream subwatersheds. The simulation results generated by using the kinematic-wave V-shaped model were also compared with the results generated from a kinematic-wave based GIUH model. Key word: HEC-GeoHMS、HEC-HMS、Distributed runoff models、Lumped runoff models、KW-GIUH
Yang, Hsi-Ming, and 楊錫明. "Parallel-Coupled Bandpass Filters Based on Lumped-Distributed Coupled-Line Sections." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/47569831261817809514.
Повний текст джерела國立臺灣大學
電信工程學研究所
93
In this study, parallel-coupled bandpass filters based on lumped-distributed coupled-line sections have been proposed to possess the merits of compact size, good selectivity, and good stopband rejection. Novel parallel-coupled bandpass filters are proposed, by using additional lumped capacitors or inductors to reduce the length of coupled-line sections. In addition, by introducing the capacitive or inductive cross-coupling effect, transmission zeros can be achieved to improve the filter selectivity. The locations of transmission zeros may be simply adjusted by varying the cross-coupling capacitance or inductance. Simple equivalent-circuit models and design formulas are also established, from which the proposed parallel-coupled bandpass filters based on lumped-distributed coupled-line sections may be design and investigated. Furthermore, the approach to suppress the spurious response is also discussed so as to enhance the stopband characteristics.
Kuan, Ming-Chih, and 官明志. "Analysis and synthesis of hybrid lumped-distributed circuits in z-domain." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/17865258213995766511.
Повний текст джерела國立臺灣科技大學
電子工程系
88
The ABCD transmission matrices of z-transform representation are developed for transmission line, capacitor and inductor in recent researches. Such representations facilitate the investigation of circuit having cascade connection of two or more two-port networks in both frequency and time domains. In particular, the z-transform representations of circuit elements make it possible to utilize many application tools developed in digital signal processing (DSP) study. Three z-transform representations for inductor and capacitor, such as backward-difference, bilinear, and central-difference z-transforms, are investigated in this thesis. Several examples, including circuit analysis and inverse consideration, are presented to illustrate the validity of z-transform representations in circuit design. Outlines of the thesis are as followings. Chapter 1 provides an introduction to the historical background of analysis method of lumped-distributed hybrid circuit, including time-, frequency-, and z-domain methods. In this thesis, we focus on the z-domain method. Chapter 2 presents the details of three different z-transforms: backward-difference, bilinear, and central-difference z-transforms. Chapter 3 shows some examples about circuit analysis and inverse consideration in circuit design. It also points out the differences between each z-transform method mentioned previously. Conclusion remarks are mad in chapter4.
Muhammad, Zakir Hossain. "High resolution ultrasonic monitoring of muscle dynamics and novel approach to modelling." Doctoral thesis, 2005. https://ul.qucosa.de/id/qucosa%3A11817.
Повний текст джерелаLu, Zheng-Liang, and 盧政良. "Analysis and Design of Lumped- and Distributed- Element Branch-Line Coupler with Arbitrary Power Division." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/42054620414191206096.
Повний текст джерела國立交通大學
電信工程系所
97
This thesis designs a 3-section wideband branch-line coupler with an arbitrary power division. Through the even/odd mode analysis, the arbitrary power division can be achieved by controlling the characteristic impedances of the branch lines. Meanwhile, for a specified power division, the fractional bandwidth can be predicted theoretically. The 3-section branch-line couplers are implemented by lumped elements and lumped distributed elements to reduce the circuit size. Theoretical analysis is validated by measurement results of experimental circuits.
Shin, Sanghoon. "Theory and design of mixed lumped-distributed cross-coupled filters with applications to linear phase shifter and tunable filters." Thesis, 2002. http://library1.njit.edu/etd/fromwebvoyage.cfm?id=njit-etd2002-053.
Повний текст джерелаGoodrow, Sandra M. "Hydrological modeling for the regional stormwater management plan an application and intercomparison of event based runoff generation in an urban catchment using empirical, lumped vs. physical, distributed parameter modeling /." 2009. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051353.
Повний текст джерела