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Dissertations / Theses on the topic 'Frequency response characteristics'
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1
Abideen, Amar. "Dielectric Response and Partial Discharge Characteristics of Stator Winding Insulation System with SiC Stress Grading." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284502.
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The typical construction of a stator coil includes the use of end corona protection (ECP)coating, which is made of semi-conductive materials like silicon carbide (SiC). Thepurpose of ECP is to smooth the electric stress distribution near the slot exit, limitingthe electric field and partial discharge (PD) activity within the insulation system. Thisthesis investigates how ECP affects the dielectric response of a stator coil in highvoltagemeasurements, both in the time-domain and frequency-domain. It also studieshow well time-domain results transformed to the frequency-domain correspond to directmeasurements. As a further point, the effect of the ECP on PD activity was demonstrated.Measurements of dielectric response and PD were made on new coil-halves producedin the usual way in a production run for a motor. The results show that applying theECP design significantly reduces the PD activity and increases the inception voltage. Inaddition, the dielectric response of the coil with ECP tape has shown to have a nonlinearvoltage dependent characteristic due to the presence of ECP. As the voltage goes higher,this causes a shift of the loss peak toward higher frequency. A distributed-element modelof the end section of a stator coil was used to model the nonlinear effect due to ECP, andits results are compared to the measured results. Lastly, FEM simulation of a stator coilend section is presented, showing the contribution of ECP tape in evenly distributing theelectric stress near the slot exit.Den typiska konstruktionen av en statorhärva använder ändglimmskydd (ECP), somär tillverkad av halvledande material som kiselkarbid (SiC). Syftet med ECP är attjämna ut det elektriska fältet vidövergången från spåret tilländlindningen, för attundvika högpåkänning och partiell urladdningsaktivitet (PD). Arbetet som presenteras här undersöker hur ECP påverkar den dielektriska responsen hos en statorspole, vid tidsdomänoch frekvensdomänmätningar vid höga spänningar. Den studerar också hur väl tidsdomänresultat som omvandlas till frekvensdomänen motsvarar direkta mätningar. Som en annan punkt visades ECP:s inverkan på PD-aktivitet. Mätningar av dielektrisk respons och PD gjordes på nya statorhärvor som tillverkades för en stor motor. Resultaten visar att tillämpningen av ECP-konstruktionen avsevärt minskar PD-aktiviteten och ökar inceptionsspänningen. Dessutom har spolens dielektriska respons med ECP-tejp visat sig ha en ickelinjär spänningsberoende egenskap på grund av närvaron av ECP. Ö kad spänning orsakar en förskjutning av förlusttoppen mot högre frekvens. En modell för ECP användeseteendet, och dess resultat jämförs med mätningarna.utligen presenteras FEM-simulering som visar hur ECP gör fältet jämnare.
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Bartusek, Jiří. "Dynamika topných ploch a těles včetně regulačních ventilů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231397.
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This thesis is theoretically described heating surfaces, radiators and regulation valves. There are also described their features, advantages and disadvantages and division according to design. The aim of the work is determine the dynamics characteristics of heating surfaces and radiators including control valves, which are parts of measurement panel. Based on the measurement are determined appropriate characteristics of which are calculated values for regulating. The result of this study can serve as a guide to the practical measurement method of dynamics characteristics of the real-working heating systems, or serve as a template for the settings according to the measured data.
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Potáček, Lukáš. "Měřicí systém pro registraci atmosférických a spínacích přepětí v energetické síti." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233445.
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This thesis is oriented to a specific section of energetics concerned with detection and registration of time responses of fast overvoltages in high-voltage power networks. The first part of this text is information about measuring frequency response characteristics of CR-divider and calculation of typical signal distortion caused by transfer function of this divider. The design of anti-aliasing filter is also included. The second part of this thesis is oriented to selecting key features of a measuring instrument specialized for detecting and recording fast events in electrical power networks. A selection of optimal type of processor and also a choice of communication interfaces is included there as well. The last chapter prepares mathematical procedures for classification of typical fast events in electrical power network using artificial neural networks.
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Slavíček, Ondřej. "Dynamické charakteristiky běžně používaných snímačů tlaku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254445.
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This thesis deals with the dynamic properties of electric pressure transducers. These are properties that are reflected in the measurement of rapid, time-dependent processes. They could be described in two ways. Either by using amplitude and phase frequency response characteristics, or just one particular value. Natural frequency, cutoff frequency or time constant. These parameters indicate the extreme values for the use of measuring devices in the measurement of time-dependent processes. In this work will be described procedures for determining these parameters.
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Sanderson, Mark Findlay. "Whole body vibration : stimulus characteristics and acute neuromuscular responses." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/15741.
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Whole body vibration (WBV) delivers a stimulus to the body via an oscillating platform and remains a relatively new area of research. Several applications of WBV stimuli have been developed as strength training and rehabilitation modalities, but inconsistent results have been published. There is little knowledge underpinning the mechanisms to explain the elicited neuromuscular responses to WBV and a wide range of WBV parameters across the literature. As a result, safe and effective protocols are yet to be established or validated. The aim of this current research was to investigate: the electromyography (EMG) and explosive performance responses to varying WBV frequencies; the effect of WBV data analysis techniques; and the influence of external factors on WBV stimulus and neuromuscular responses. Three main studies were completed: 1. An individualised response of both EMG and jump performance appears to exist dependent on vertical WBV frequency, in trained participants. This is in spite of no overall frequency dependent effect of EMG or performance responses across participants as a group. The influence of the role of expectancy effect appears minimal following this particular WBV protocol. 2. There was a significant effect of filter technique on EMG data recorded during vertical WBV. A tailored, WBV specific notch filter technique may offer an effective balance; excluding WBV noise artifacts without removing significant portions of valuable muscle signal EMG data. 3. The influence of external load on WBV acceleration output also appears minimal. Platform acceleration output was dependent on WBV frequency, as expected. Lower accelerations were recorded in superior body segments, suggesting a dampening mechanism, which was also proportionally dependent on frequency. EMG activity of upper and lower leg segments may differ in response to frequency, likely due to transmission distances involved. This may partially account for a potential dampening mechanism. In addition, a protocol to quantify WBV stimuli delivered by this particular WBV type illustrated significant differences in theoretical and actual parameters. This may explain not only the lack of overall explosive performance effect reported earlier; but also the inconsistent WBV literature. Future research should quantify WBV stimulus before investigating possible neuromuscular responses to individualised protocols, which may be assessed via EMG activity.
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Badri, Abdellatef E. O. "Performance improvement of MEMS accelerometers in vibration based diagnosis." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/performance-improvement-of-mems-accelerometers-in-vibration-based-diagnosis(f407deb3-6af5-476c-bbc7-c101873ced32).html.
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Vibration measurement and analysis has been an accepted method since decades to meet a number of objectives - machinery condition monitoring, dynamic qualification of any designed structural components, prediction of faults and structural aging-related problems, and several other structural dynamics studies and diagnosis. However, the requirement of the vibration measurement at number of locations in structures, machines and/or equipments makes the vibration measurement exorbitant if conventional piezoelectric accelerometers are used. Hence, there is a need for cheaper and reliable alternative for the conventional accelerometers. The Micro-Electro-Mechanical Systems (MEMS) accelerometers are one such cheap alternative. However, a significant deviation in the performance of the MEMS accelerometers has been observed in earlier research studies and also confirmed by this presented study when compared with well known conventional accelerometer. Therefore, two methods have been suggested to improve the performance of the existing MEMS accelerometers; one for correction in time domain and other in frequency domain. Both methods are based on the generation of a characteristic function (CF) for the MEMS accelerometer using well known reference accelerometer in laboratory tests. The procedures of both methods have been discussed and validations of these methods have been presented through experimental examples. In addition, a Finite Element (FE) model of a typical MEMS accelerometer has been developed and modal analysis has been carried out to understand the dynamics of capacitive type MEMS accelerometer and to identify the source of errors. It has been observed that the moving fingers behave like a cantilever beam while the fixed fingers showed rigid body motion. This cantilever type of motion seems to be causing non-parallel plates effect in the formed capacitors between moving and fixed fingers which results in errors in the vibration measurement. Hence, design modifications on finger shape have been suggested to remove the cantilever motion and results showed remarkable improvement. Moreover, the effect of using synchronous amplitude modulation and demodulation in the readout circuit has been studied. The experimental study showed that this circuit also introduces errors in amplitude and phase of the output signal compared with the input signal. Thus, in the new design of MEMS accelerometers, improvements in both mechanical design and electronic circuit are required.
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Klubus, Jan. "Elektronické filtrační obvody s obecnými kmitočtovými charakteristikami." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413252.
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Master’s thesis deals with the issue of electronic filtering circuits with arbitrary frequency characteristics. First part of the thesis describes theoretical basis. Second part explores the possibilities of design procedures for filters with arbitrary frequency characteristics. Design procedures are demonstrated on examples accordingly to the presented methods, including their circuit implementation and computer simulation to verify the correctness of theoretical assumptions. Thesis also explores the possibilities of tuning circuit structures and electronic setting for characteristics using controllable active elements.
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Pešek, Marko. "Modulární systém pro měření charakteristik dvoupásmových reproduktorových soustav." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-401980.
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This master's thesis deals with design and implementation of modular system for two-way loudspeaker system's characteristics. Work focus mainly on the enclosure geometry and speaker placement. The individual modules of the system were designed and then implemented. Furthermore, the characteristics of these modules were measured and laboratory tasks using these modules were elaborated.
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"Frequency Response Characteristics Of Respiratory Flow-meters." Master's thesis, 2013. http://hdl.handle.net/2286/R.I.20966.
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abstract: Flow measurement has always been one of the most critical processes in many industrial and clinical applications. The dynamic behavior of flow helps to define the state of a process. An industrial example would be that in an aircraft, where the rate of airflow passing the aircraft is used to determine the speed of the plane. A clinical example would be that the flow of a patient's breath which could help determine the state of the patient's lungs. This project is focused on the flow-meter that are used for airflow measurement in human lungs. In order to do these measurements, resistive-type flow-meters are commonly used in respiratory measurement systems. This method consists of passing the respiratory flow through a fluid resistive component, while measuring the resulting pressure drop, which is linearly related to volumetric flow rate. These types of flow-meters typically have a low frequency response but are adequate for most applications, including spirometry and respiration monitoring. In the case of lung parameter estimation methods, such as the Quick Obstruction Method, it becomes important to have a higher frequency response in the flow-meter so that the high frequency components in the flow are measurable. The following three types of flow-meters were: a. Capillary type b. Screen Pneumotach type c. Square Edge orifice type To measure the frequency response, a sinusoidal flow is generated with a small speaker and passed through the flow-meter that is connected to a large, rigid container. True flow is proportional to the derivative of the pressure inside the container. True flow is then compared with the measured flow, which is proportional to the pressure drop across the flow-meter. In order to do the characterization, two LabVIEW data acquisition programs have been developed, one for transducer calibration, and another one that records flow and pressure data for frequency response testing of the flow-meter. In addition, a model that explains the behavior exhibited by the flow-meter has been proposed and simulated. This model contains a fluid resistor and inductor in series. The final step in this project was to approximate the frequency response data to the developed model expressed as a transfer function.Dissertation/Thesis
M.S.Tech Electrical Engineering 2013
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Xu, Ji-Yuan, and 許吉元. "ELECTRIC CURRENT SENSORS WITH FLAT FREQUENCY RESPONSE CHARACTERISTICS." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/33104287638367079905.
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Yu, Che-hsuan, and 游哲軒. "Dynamic Modeling and Frequency Response Characteristics of Electro-Thermal Microactuators." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/70924160252033984215.
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碩士逢甲大學
機械工程學所
95
In this thesis, we present the design, fabrication, and analysis of static and dynamic response for electro-thermal micro-actuators. Based on the electrical and thermal principles, we establish a lumped dynamic model. In the research, we first conduct static analysis through finite-element method and experiments to support the accuracy and reliability of the proposed model. Based on proposed model, the further analysis on the dynamic characteristics (frequency response) are further investigated. The proposed model is simple but effective in the design and analysis for the electro-thermal micro-actuators.
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Chen, Wei-Yan, and 陳偉彥. "Frequency Response Characteristics in Directly Modulated Semiconductor Lasers Subject to External Optical Injection." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/92671993707598792064.
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碩士國立中正大學
光機電整合工程所
94
A numerical simulation analyses on frequency response characteristics in directly modulated semiconductor lasers subject to external optical injection is presented in this thesis. The content is bandwidth、resonance frequency and flatness of the laser system as a function of operational parameters and intrinsic parameters are investigated and discussed to explore the appropriate operating conditions for practical applications in optical fiber communications. Through the injection-locking method under stable locking area, more larger injection parameter and more positive detuning frequency difference can observe above 40GHz bandwidth, have increased about 3 times than the laser system that is not injected. If increase the bias current at the same time, bandwidth can reach above 60GHz at most. Change different intrinsic parameters, then bandwidth increase in various degrees too. So the injection-locking technique is a very effective method for bandwidth enhancement. When semiconductor laser used an emitter, frequency response curve more flatter is more fine to optical fiber communications. We change different operational and intrinsic parameters for the flatness influence of the curve, in order to get the best parameters afterwards.
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Kommanapalli, Deepika, I. J. Murray, Jan Kremers, Neil R. A. Parry, and Declan J. McKeefry. "Temporal characteristics of L and M-cone isolating steady-state ERGs." 2014. http://hdl.handle.net/10454/10203.
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noCone isolating stimuli were used to assess the temporal frequency response characteristics of L- and M-cone electroretinograms (ERGs) in nine trichromatic and four dichromatic human observers. The stimuli comprised sinusoidal temporal modulations varying from 5 to 100 Hz. ERGs were recorded using corneal fiber electrodes and subjected to fast Fourier transform analysis. At low temporal frequencies (<10 Hz<10 Hz) the L- and M-cone ERGs had similar amplitude and exhibited minimal differences in apparent latency. At higher flicker rates (>20 Hz>20 Hz) L-cone ERGs had greater amplitudes and shorter apparent latencies than the M-cone responses. These differences between the L- and M-cone ERGs are consistent with their mediation by chromatic and luminance postreceptoral processing pathways at low and high temporal frequencies, respectively.
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Lovelace, William Edward. "Analysis of the correlation between wind power generation and system response characteristics following unit trips on the ERCOT grid." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-1129.
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Electric power generation using wind turbines is on the rise in not only the United States but the entire globe. While the benefits from such methods of generation include clean and renewable energy, wind turbines may pose a potential risk to the stability of grid operation. Wind turbine generators are similar to conventional generators; however, the manner with which the wind turbine is coupled to the grid may reduce system inertia and increase the magnitude of transient stability problems. This study empirically examines the effect of wind generation on ERCOT system response characteristics following unit trips such as frequency drop, and phasor oscillation frequency and damping. It is shown with a high degree of certainty that an increase in wind generation is leading to a greater phasor oscillation frequency and lesser system inertia. Wind generation may also be leading to less system damping and smaller power frequency drops.text
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Huang, Stanley. "Supra-Characteristic-Frequency Response in Gerbil Auditory Nerve Frequency Tuning Curves." Thesis, 2011. https://doi.org/10.7916/D89029R5.
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Sound arriving at the ear causes the vibration of the sensory tissues, including the basilar membrane (BM), inside the cochlea and, in turn, leads to inner hair cell excitation and auditory nerve fiber (ANF) responses. The goal of this study is to better understand the mechanics of inner hair cell excitation which leads to hearing. BM motion and ANF tuning are generally very similar, but the ANF had appeared to be unresponsive to a plateau mode of BM motion that occurs at frequencies above an ANF's characteristic frequency (CF). We recorded ANF responses from the gerbil, concentrating on this supra-CF region. We observed a supra-CF plateau in ANF responses at high stimulus level, indicating that the plateau mode of BM motion can be excitatory. Quantitative aspects of our findings suggest that the differential longitudinal motion that occurs within the traveling wave but not the plateau mode increases the sensitivity of inner hair cell excitation. The main findings of this study include: The detection of the plateau threshold within the supra-CF region of the ANF tuning curve. A larger BM motion was necessary for an ANF to reach a threshold response within the plateau region than the traveling wave region, based on the previous lack of ANF plateau threshold detection and a comparison to the BM plateau levels in the literature. Stimuli used in this study, even though unnaturally high in level, advanced our understanding of cochlear mechanics. However, at high sound pressure levels used, the middle ear generated subharmonic distortions that could produce confounding effects in the plateau responses. Hence, we also characterized the subharmonics and were able to rule out the possibility that they were solely responsible for the plateau responses we observed.
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Hu, Ling-Jie, and 胡玲潔. "Research on Frequency Response Characteristic in Power System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ana43d.
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碩士國立臺灣大學
電機工程學研究所
106
The power system fundamental frequency, is one of the three indicators of evaluating power quality. The frequency reflects the balance between active power of generation and load requirement (including the active loss). In order to ensure the frequency stability, the active power output of generating unit must be regulated correspondingly for satisfying the change of load requirement at any time. In general, frequency regulation of power system is separated into three categories including primary frequency regulation, secondary frequency regulation (Automatic Generation Control, AGC) and third frequency regulation. This research introduces the basic principles of primary and secondary frequency regulations, and the more important parameter in interconnected power system: frequency response characteristic coefficients are proposed. Importance of frequency response characteristic is explained by setting the frequency bias coefficients in the AGC. In addition, this research develops an online estimation algorithm considering frequency response characteristic of primary frequency regulation and secondary frequency regulation, and evaluated the precision of this algorithm results applying the MATLAB/SIMULINK simulation software.
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Lin, Ku-Hsien, and 林顧憲. "FPGA Implementation of Evaluating Power System's Frequency Response Characteristic." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/09778773305530109931.
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碩士國立成功大學
電機工程學系碩博士班
93
With the open-access of Energy Management Systems (EMS) structure was proposed, various kinds of relevant modules which improve EMS efficiency has been developed. In the control of the real power balance between generation and demand, the control performance and system responses are based on the setting of frequency bias coefficient, whereas the setting of frequency bias coefficient is relative to system frequency response characteristic. Therefore, this thesis aims at developing the prototype chip design of evaluating power system’s frequency response characteristic. While the recursive least-square algorithm estimates the system frequency response characteristic online in real-time, the Field Programmable Gate Array (FPGA) is implemented to be the estimation platform. Finally, the prototype design is tested by the simulated environment. The results demonstrate high efficiency of evaluation ability and computation performance for the proposed platform.
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Lee, Ko-Shien, and 李科賢. "Application of ANN-SCE Algorithm to the Evaluation of Automatic Generation Control Performance and Frequency Response Characteristic." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/78564251060087101475.
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碩士國立成功大學
電機工程學系碩博士班
93
The load-frequency control in Taiwan still operates with automatic generation control (AGC) to track the continuously varying loads. Due to the sustained variation of loads and the uncertainties in unit movements, the characteristic of system’s frequency response is quite complicated and cannot be directly measured. The conventional operating principle in the secondary control of independent system is to adopt the frequency bias coefficient, B , as a proxy for the frequency response characteristic, β , to calculate the system control error and use it as a reference for control compensation. However, while B is not close to β, system control error might not lead to the required generation response for regulation and cause unnecessary oscillation in unit movements and power flow in the transmission grid. This thesis proposes an artificial neural network based system control error algorithm (ANN-SCE algorithm) to evaluate the frequency response characteristic. The estimated value can be gainfully used for secondary control to improve the AGC performance. Likewise, with more independent power producers (IPPs) joining the load following and frequency regulation services, how to assess IPPs’ unit control performance on system’s load frequency control is the interesting subject that system operators would like to explore. This thesis utilizes estimated β to evaluate the influence of the IPP units on the generation control. The simulation results verify that the assessment is beneficial for dispatch center to enhance load frequency control performance.