Дисертації з теми "Periodic noise"
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Jenkins, Michael David. "Active control of periodic machinery vibrations." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.480701.
Повний текст джерелаErrico, Fabrizio. "Flow-Induced Vibrations and Noise of Periodic Structural Systems." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEC002.
Повний текст джерелаMost of the literature considers different works on the flow-induced noise and vibrations for basic structural parts, such as Kirchhoff plates. The main objective of this research is to extend the work done to periodic structures targeting a number of novelties with regards to different scales: the aerodynamic scale, the periodicity scale and the frequency scale.Even though analytical and Finite Element(FE)-based numerical approaches have been developed to deal with specific problems, some limits still persist. For example, the computational effort can easily become cumbersome even for simple structural shapes or for increasing excitation frequency; the convective wavelengths, for most industrially-relevant cases, are largely smaller that flexural ones and, thus, the meshing requirements become more demanding. When the structural complexity increases, even small scale models might require a high number of elements increasing computational cost.In the frameworks of FE and WFE based methods, this work proposes two numerical approaches to deal with the vibrations and noise induced by a Turbulent Boundary Layer (TBL) excitation on periodic structural systems. Firstly, a 1D WFE (Wave Finite Element) scheme is developed to deal with random excitations of flat, curved and tapered finite structures: multi-layered and homogenised models are used. In this case a single substructure is modelled using finite elements. At each frequency step, one-dimensional periodic links among nodes are applied to get the set of waves propagating along the periodicity direction; the method can be applied even for cyclic periodic systems. The set of waves is successively used to calculate the Green transfer functions between a set of target degrees of freedom and a subset representing the wetted (loaded) ones. Subsequently, using a transfer matrix approach, the flow-induced vibrations are calculated in a FE framework.Secondly, a 2D WFE approach is developed in combination with a wavenumber-space load synthesis to simulate the sound transmission of infinite flat, curved and axisymmetric structures: both homogenised and complex periodic models are analysed. In this case, finite-size effects are accounted using a baffled window equivalence for flat structures and a cylindrical analogy for curved panels.The presented numerical approaches have been validated with analytical, numerical and experimental results for different test cases and under different load conditions. In particular, analytical response and classic FEM have been used as references to validate the flow-induced vibrations of plates and cylinders under turbulent boundary layer load; FE method has been used also to validate a tapered conical-cylindrical model under diffuse acoustic field excitation and the flow-induced noise computations under TBL. From experimental point of view, the approach has been validated comparing results in terms of transmission loss evaluated on aircraft fuselage panels (composite honeycomb and doubly-ribbed curved panels) under diffuse acoustic field excitation.Finally, the use of the presented methodologies for the vibroacoustic optimization of sandwich plates, is analysed and proposed through some case-studies. Standard periodic core designs are modified tailoring the bending and shear waves' propagation versus frequency against the acoustic and convective wavenumbers. The resulting sound transmission losses are computed using the numerical approaches developed in this work and validated with measurements under diffuse acoustic field, taken from 3D-printed models. Strong increases of sound transmission loss are observed for fixed mass of the plates and between 1.5 kHz and 10 kHz
Sanchez, Juan Eusebio. "Semiconductor device simulation of low-frequency noise under periodic large-signal conditions." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1001178.
Повний текст джерелаWu, Yue. "Pathwise anticipating random periodic solutions of SDEs and SPDEs with linear multiplicative noise." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/15991.
Повний текст джерелаKinney, Charles E. "Realtime controller tuning for periodic disturbance rejection with application to active noise control." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3352708.
Повний текст джерелаTitle from first page of PDF file (viewed June 16, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 159-167).
Kuhwald, Isabelle [Verfasser], Ilya [Akademischer Betreuer] Pavlyukevich, and Samuel [Akademischer Betreuer] Herrmann. "Small noise analysis of time-periodic bistable jump diffusion / Isabelle Kuhwald. Gutachter: Ilya Pavlyukevich ; Samuel Herrmann." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2015. http://d-nb.info/1076503144/34.
Повний текст джерелаKulebi, Baybars. "The Broad-band Noise Characteristics Of Selected Cataclysmic Variables (cvs), Anomalous X-ray Pulsars (axps) And Soft Gamma Repeaters (sgrs)." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608117/index.pdf.
Повний текст джерелаLippolis, Domenico. "How well can one resolve the state space of a chaotic map?" Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33841.
Повний текст джерелаJbili, Nadia. "Conception et analyse des schémas d'optimisation pour la résonance magnétique nucléaire Optimal periodic control of spin systems : Application to the maximization of the signal to noise ratio per unit time." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLED025.
Повний текст джерелаThis thesis deals with optimal control techniques for systems related to quantum mechanics and nuclear magnetic resonance. The work presented in this memory is divided into four parts.In the first part, we focus on to the simultaneous optimal control of the Schrödinger time-dependent equations via a laser field that represents a control term and that is assumed to be submitted to a family of perturbations. This lead us to consider a multi-criteria optimization problem through the introduction of a set of cost functional to be minimized (in the sense of Pareto).In the second part, we study the mathematical framework of the periodic Bloch equation. The necessary first-order optimality conditions are derived. More precisely, we prove the existence of a periodic solution, as well as the existence of an optimum.In the third part, we present a new optimization algorithm for periodic dynamics. This algorithm is applied to the maxi- mization of SNR in NMR. The work here is more of an numerical and algorithmic nature. To our knowledge, this is the first quantum control algorithm to consider periodic dynamics in time. We have shown the efficiency of this method in the case of a homogeneous and inhomogeneous spin system.The last part presents the Shinnar-Le-Roux algorithm (SLR), which is an analytical optimization method. Numerical results were obtained by comparing this method with an iterative grape-type method introduced in previous chapters. The result of this comparison gives an advantage to the SLR algorithm
Князь, Ігор Олександрович, Игорь Александрович Князь, Ihor Oleksandrovych Kniaz та В. Ю. Постна. "Індукований шумом рух частинок у періодичних силових полях". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39352.
Повний текст джерелаАвраменко, Віктор Васильович, Виктор Васильевич Авраменко, Viktor Vasylovych Avramenko, A. Konoplianchenko, and R. Ponomarenko. "The Method for Detection of the Reference Signal." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/47238.
Повний текст джерелаGry, Laurent. "Modélisation du comportement dynamique d'une voie TGV pour la réduction du bruit de roulement." Châtenay-Malabry, Ecole centrale de Paris, 1995. http://www.theses.fr/1995ECAP0419.
Повний текст джерелаComeau, Laura Elizabeth Lamplugh. "Snow modelling for understanding human ecodynamics in periods of climate change." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8012.
Повний текст джерелаChurch, M. J. "Plants and people in the later prehistoric and Norse periods of the Western Isles of Scotland." Thesis, University of Edinburgh, 2002. http://hdl.handle.net/1842/24455.
Повний текст джерелаGouda, Souaïbou. "Etats, sports et politiques en Afrique noire francophone : cas du Bénin, du Congo, du Niger et du Sénégal." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10201.
Повний текст джерелаDockrill, Stephen James. "Settlement and landscape in the Northern Isles : a multidisciplinary approach : archaeological research into long term settlements and thier associated arable fields from the Neolithic to the Norse periods." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/6334.
Повний текст джерелаDockrill, Stephen J. "Settlement and landscape in the Northern Isles; a multidisciplinary approach. Archaeological research into long term settlements and thier associated arable fields from the Neolithic to the Norse periods." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/6334.
Повний текст джерелаStrehlau, Hannah. "Animals in burial contexts : an investigation of Norse rituals and human-animal relationships during the Vendel Period and Viking Age in Uppland, Sweden." Thesis, Uppsala universitet, Institutionen för arkeologi och antik historia, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355238.
Повний текст джерелаКоваль, Лілія Миколаївна, та Liliia Koval. "Засіб виявлення корисних стохастично-періодичних радіосигналів в телекомунікаційних мережах". Master's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2021. http://elartu.tntu.edu.ua/handle/lib/36233.
Повний текст джерелаThe mathematical apparatus and means of component detection of useful stochastic-periodic radio signals in telecommunication networks on the principles of ETSS through the application of the theory of PCSP and component processing are developed in the work. On the basis of the mathematical apparatus the algorithm of effective detection of useful stochastic-periodic radio signals in telecommunication networks with interferences by calculation of components of correlation as quantitative indicators of detection is constructed. A tool for effective detection of stochastic-periodic radio signals in telecommunication networks with interference in the form of program code when using MATLAB for telecommunication systems has been developed. An empirical study of the process of detection of stochastic-periodic radio signals in telecommunications networks with interference, which confirmed the fact of the development of the developed means of detecting useful radio signals.
ВСТУП 8 РОЗДІЛ 1. ОСНОВНА ЧАСТИНА 10 1.1. Завади в телекомунікаційних мережах 10 1.1.1. Електромагнітні завади 10 1.1.2. Завади обладнання мережі 12 1.2. Методи виявлення радіосигналів в телекомунікаційних мережах 16 1.2.1. Метод усереднення радіосигналів 16 1.2.2. Фільтрація радіосигналів 17 1.2.3. Кореляція радіосигналів 21 1.3. Висновки до розділу 2 23 РОЗДІЛ 2. ОСНОВНА ЧАСТИНА 24 2.1. Особливості радіосигналів у телекомунікаційних мережах 24 2.2. Математичний апарат ПКВП як зображення радіосигналів 26 2.3. Компонентний метод виявлення радіосигналів 30 2.4. Алгоритм виявлення радіосигналів 32 2.5. Висновки до розділу 3 36 РОЗДІЛ 3. НАУКОВО-ДОСЛІДНА ЧАСТИНА 37 3.1. Блок-схема програмного засобу виявлення радіосигналів 37 3.2. Програмна реалізація засобу виявлення радіосигналів 38 3.3. Результати виявлення радіосигналів 41 3.4. Оцінювання результатів виявлення радіосигналів 44 3.5. Інтерфейс засобу виявлення радіосигналів 46 3.6. Висновки до розділу 3 48 РОЗДІЛ 4. ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ 49 4.1. Охорона праці 49 4.2. Безпека в надзвичайних ситуаціях 52 4.3. Висновки до розділу 4 55 ЗАГАЛЬНІ ВИСНОВКИ 56 ПЕРЕЛІК ПОСИЛАНЬ 57 ДОДАТКИ 60 ДОДАТОК А. Копія тези 61 ДОДАТОК Б. Скрипт компонентної обробки радіосигналу 65 ДОДАТОК В. Скрипт програмного засобу виявлення радіосигналів 66 ДОДАТОК Г. Скрипт програмного засобу виявлення радіосигналів із інтерфейсом 67
Gille, Laure-Anne. "Caractérisation physique et perceptive de différentes compositions de trafic routier urbain pour la détermination d'indicateurs de gêne en situation de mono-exposition et de multi-exposition." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSET005/document.
Повний текст джерелаRoad traffic noise, and in particular powered two-wheeler noise, constitute an important source of noise annoyance. In order to estimate the noise exposure in cities of more than 100 000 inhabitants, the European directive 2002/49/EC requires the elaboration of strategic noise maps, based on the Lden index. This index is also used in exposureresponse relationships, to predict the percentages of annoyed people, by road traffic noise for example. By coupling strategic noise maps and these exposure-response relationships, noise annoyance maps could be established. The relevance of this index to predict noise annoyance in cities is however often questioned, since many influential acoustical factors (e.g. spectral and temporal features) are not considered by this index. The aim of this thesis is to enhance the characterization of noise annoyance due to different compositions of urban road traffic including powered two-wheelers. To achieve this goal, experiments were carried out under controlled conditions. A first study concerned the influence of several acoustical features related to quiet periods and vehicle pass-by noises on the annoyance due to urban road traffic noise. This study demonstrated the influence of the presence of quiet periods and of the number of vehicles within the urban road traffic and to the absence of the influence of the order of the vehicle pass-by noises, the position and duration of quiet periods. These results were used to carry out the physical and perceptual characterization of different compositions of urban road traffic noise. Multilevel regression was used to calculate noise annoyance, by coupling combinations of indices relating to influential acoustical features and an individual factor: noise sensitivity. In cities, road traffic noise is often combined with other noises. In the framework of this thesis, noise exposure to road traffic noise combined with aircraft noise was studied. Therefore, the same work as the one performed for urban road traffic noise was carried out for aircraft noise, leading also to relevant combinations of noise indices. In order to characterize annoyances due to road traffic noise and to aircraft noise in a combined exposure situation, data from the previous experiments and from an experiment dealing with these combined noises were used through an appropriate multilevel regression, as done in literature. The regression allows annoyance models for each noise source to be proposed. Then, total annoyance due to combined noises was studied, in order to highlight the perceptual phenomena related to the combined exposure. Total noise annoyance models were proposed, using proposed annoyance model of each noise source. Finally, these single source annoyance models and total annoyance models were tested using data of a socio-acoustic survey. To do this, a methodology has been proposed to estimate the different indices involved in the annoyance models, from the Lden values obtained from the strategic noise maps and used to define the noise exposure of the respondents. This confrontation showed that the models proposed on the basis of experiments carried out under laboratory conditions and coupled with a methodology of estimation of the noise indices from Lden values, enabled a good prediction of in situ annoyance
Abbad, Ahmed. "Développement d'un traitement acoustique basses-fréquences à base de résonateurs d'Helmholtz intégrés à membrane électroactive." Thèse, Université de Sherbrooke, 2018. http://hdl.handle.net/11143/11906.
Повний текст джерелаKacki, Sacha. "Influence de l’état sanitaire des populations anciennes sur la mortalité en temps de peste : contribution à la paléoépidémiologie." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0058/document.
Повний текст джерелаFrom the 6th century onwards, plague caused recurring mortality crises in the Western world. Such epidemics hadprofound biological, cultural, economic and political impacts on European societies. Some aspects of the history ofplague epidemics are currently well known, but many questions remain unanswered, such as the preciseepidemiological pattern of the disease in ancient times. It is unclear whether plague killed people indiscriminately orwhether this disease was selective with respect to age, sex and health. This research contributes to this debate.It consists of an anthropological and paleopathological study of skeletal remains of 1090 individuals, including plaguevictims from four medieval and post-medieval burial grounds, and individuals from two parochial cemeteries in useduring periods of normal mortality. Results from the four plague-related assemblages reveal a peculiar demographicsignature. Age and sex distribution differs clearly from what is expected in non-epidemic periods, when it is shown tocorrespond closely to the demographic structure of the living population. Moreover, the study of various non-specificskeletal stress markers shows that plague victims were in a better health before they passed away than people who diedin non-epidemic periods. The results demonstrate that individuals who suffered stress and disease had a reducedchance of survival in non-epidemic periods, whereas they were not at a higher risk to die during plague epidemics.This study provides evidence that plague was not selective, and that it killed regardless of sex, age, and pre-existing health
Calès, Sabrina. "L'oikonomos dans les cités grecques aux époques classique et hellénistique." Thesis, Bordeaux 3, 2019. http://www.theses.fr/2019BOR30045.
Повний текст джерелаIn Greek cities, and especially in democratic systems, many citizens had to deal with public money. The oikonomos is one of the civic financial magistracies that spread throughout the Greek world in classical and Hellenistic times but especially in Asia Minor and Pont-Euxin.Firstly, the oikonomos refers to the administration of the oikos, the economic and social unit of Greek society. The organisation of the oikos and the practices implemented to ensure the survival and development of its members correspond to elementary principles known since epic poems. From the end of the 5th century onwards, the oikonomos has been identified as the holder of a technè that stimulated philosophical reflection in the city of Athens. The oikonomos was identified as the agent of the practice of oikonomia, the science of domestic management. In an era of significant economic, political and social change, philosophers established the link between domestic management and the administration of the city's affairs. The analysis of literary sources has made it possible to identify and understand the transition that took place at the end of the 4th century between the oikonomos, the manager of the oikos, and the civic magistracy. Secondly, the study of epigraphic sources highlights the role and place of the oikonomos in the cities where it is documented. In most cases, there was only one holder of the magistracy. The oikonomos was involved both in the payment of expenses and in the material support for the honours decreed by the city. Sometimes it may has been associated with other people. Treasurers, neopes or other financial or non-financial magistrates worked with the oikonomos. The analysis of their relationships provides elements for understanding not only the attributions of oikonomoi, the chain of the responsibilities involved in the process of honours publication and resolution but also on the management of the cities' finances
Mattsson, McGinnis Meghan. "Ring Out Your Dead : Distribution, form, and function of iron amulets in the late Iron Age grave fields of Lovö." Thesis, Stockholms universitet, Arkeologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-131728.
Повний текст джерелаChen, Po-Chun, and 陳柏均. "Routing Noise Suppression Using Novel Non-Periodic Electromagnetic Bandgap Structures." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/14276718625664500020.
Повний текст джерела國立臺灣大學
電信工程學研究所
105
This thesis focuses on the problem of Electromagnetic Interference (EMI) of Printed Circuit Board (PCB) routing noise. It first considered Defected Ground Structure (DGS) to suppress noise for EMI improvement, but found it causing another EMI problem. Hence, a novel non-periodic Electromagnetic-Bandgap (EBG) structure is proposed in this thesis. By combining non-periodic EBG and de-coupling capacitors, the propagation characteristics are investigated and an design rule is proposed. The full-wave EM simulation, ADS and GTEM cell measurement are used to validate the accuracy of the proposed analysis and design. Finally, miniaturization of the non-periodic EBG is also addressed.
Lin, Hsin-Hui, and 林欣慧. "Application of Wavelet Transform to Image processing for Periodic Noise." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/39849946595407158504.
Повний текст джерела康寧大學
資訊傳播研究所
99
In this study, discrete wavelet transform is used to experiment with image. Experimental image noise reduction by periodic. Enhancement pattern for different images. Wavelet filter before the image to the average best way to preserve the image information. Average filter is still the best way,when retained wavelet transform image compression. But the best way to histogram equalization is restored the wavelet. When the performance of the image to Photo mode, Text section does not apply histogram equalization. So when the image was produced after the impact of periodic noise, to deal with the discrete wavelet image, Restore or not to be considered. To get the best results. One of the primary purposes of the CVIPtools development is to allow students, faculty, and other researchers to explore the power of computer processing of digital images.The new Windows version of CVIPtools, developed at the Computer Vision and Image Processing Laboratory here at Southern Illinois University at Edwardsville, under the continuing direction of Dr. Scott E Umbaugh, is currently available with the textbook, Digital Image Processing and Analysis The image used in this study compared CVIPtools. Apply using the more simple than MATLAB.
"Realtime controller tuning for periodic disturbance rejection with application to active noise control." UNIVERSITY OF CALIFORNIA, SAN DIEGO, 2009. http://pqdtopen.proquest.com/#viewpdf?dispub=3352708.
Повний текст джерелаKamal, Noorfazila. "Reference spurs in an integer-N phase-locked loop : analysis, modelling and design." Thesis, 2013. http://hdl.handle.net/2440/80592.
Повний текст джерелаThesis (Ph.D. )-- University of Adelaide, School of Electrical and Electronic Engineering, 2013
Ndayikengurukiye, Didier. "Estimation de cartes d'énergie de hautes fréquences ou d'irrégularité de périodicité de la marche humaine par caméra de profondeur pour la détection de pathologies." Thèse, 2016. http://hdl.handle.net/1866/16178.
Повний текст джерелаThis work presents two new and simple human gait analysis systems based on a depth camera (Microsoft Kinect) placed in front of a subject walking on a conventional treadmill, capable of detecting a healthy gait from an impaired one. The first system presented relies on the fact that a normal walk typically exhibits a smooth motion (depth) signal, at each pixel with less high-frequency spectral energy content than an abnormal walk. This permits to estimate a map for that subject, showing the location and the amplitude of the high-frequency spectral energy (HFSE). The second system analyses the patient's body parts that have an irregular movement pattern, in terms of periodicity, during walking. Herein we assume that the gait of a healthy subject exhibits anywhere in the human body, during the walking cycles, a depth signal with a periodic pattern without noise. From each subject’s video sequence, we estimate a saliency color map showing the areas of strong gait irregularities also called aperiodic noise energy. Either the HFSE or aperiodic noise energy shown in the map can be used as a good indicator of possible pathology in an early, fast and reliable diagnostic tool or to provide information about the presence and extent of disease or (orthopedic, muscular or neurological) patient's problems. Even if the maps obtained are informative and highly discriminant for a direct visual classification, even for a non-specialist, the proposed systems allow us to automatically detect maps representing healthy individuals and those representing individuals with locomotor problems.
Mohebbi, Hamid Reza. "Parametric Interaction in Josephson Junction Circuits and Transmission Lines." Thesis, 2011. http://hdl.handle.net/10012/5973.
Повний текст джерелаNowak, Sean. "Schrift auf den Goldbrakteaten der Völkerwanderungszeit." Doctoral thesis, 2003. http://hdl.handle.net/11858/00-1735-0000-0006-AEE1-A.
Повний текст джерела