Zaloguj się

Gotowe bibliografie tematyczne / Radiated noise / Rozprawy doktorskie

Kliknij ten link, aby zobaczyć inne rodzaje publikacji na ten temat: Radiated noise.

Rozprawy doktorskie na temat „Radiated noise”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 4 lutego 2022

Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych

Wybierz rodzaj źródła:

Sprawdź 45 najlepszych rozpraw doktorskich naukowych na temat „Radiated noise”.

Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.

Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.

Przeglądaj rozprawy doktorskie z różnych dziedzin i twórz odpowiednie bibliografie.

1

Chiasson, Leo E. "Radiated noise from a three dimensional truss." Thesis, Monterey, California. Naval Postgraduate School, 1995. http://hdl.handle.net/10945/26192.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

2

Chiasson, Leo E. Jr. "Radiated noise from a three dimensional truss." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36058.

Pełny tekst źródła

Streszczenie:

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.<br>Includes bibliographical references (leaves 83-84).<br>by Leo E. Chiasson, Jr.<br>M.S.

Style APA, Harvard, Vancouver, ISO itp.

3

Charpentier, Arnaud. "Active Control Of Noise Radiated From Personal Computers." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35711.

Pełny tekst źródła

Streszczenie:

As an indirect consequence of increased heat cooling requirements, personal computers (PC) have become noisier due to the increased use of fans. Hard disk drives also contribute to the annoying noise radiated by personal computers, creating a need for the control of computer noise. Due to size constraints, the implementation of passive noise control techniques in PC is difficult. Alternatively, active noise control (ANC) may provide a compact solution to the noise problems discussed above, which is the subject of this work. First, the computer noise sources were characterized. The structure-

Style APA, Harvard, Vancouver, ISO itp.

4

Awasthi, Manuj. "Sound Radiated from Turbulent Flow over Two and Three-Dimensional Surface Discontinuities." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/64158.

Pełny tekst źródła

Streszczenie:

Measurements have been performed to understand the sound source mechanism in turbulent boundary layer flow over two and three-dimensional surface discontinuities whose height is smaller than the incoming boundary layer thickness. The work was performed in two different types of boundary layers: a wall-jet flow and a conventional high Reynolds boundary layer. In the wall-jet flow, measurements of far field sound from two-dimensional forward facing steps, gaps with rounded corners and swept forward facing steps with rounded corners were made. The sound from a forward facing step is shown to exhi

Style APA, Harvard, Vancouver, ISO itp.

5

Haikonen, Kalle. "Underwater radiated noise from Point Absorbing Wave Energy Converters : Noise Characteristics and Possible Environmental Effects." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-235016.

Pełny tekst źródła

Streszczenie:

The conversion of wave energy into electrical energy has the potential to become a clean and sustainable form of renewable energy conversion. However, like all forms of energy conversion it will inevitably have an impact on the marine environment, although not in the form of emissions of hazardous substances (gases, oils or chemicals associated with anticorrosion). Possible environmental issues associated with wave energy conversion include electromagnetic fields, alteration of sedimentation and hydrologic regimes and underwater radiated noise. Underwater noise has the potential to propagate o

Style APA, Harvard, Vancouver, ISO itp.

6

Burgemeister, Kym A. "Novel methods of transduction for active control of harmonic sound radiated by vibrating surfaces." Title page, contents and abstract only, 1996. http://hdl.handle.net/2440/37932.

Pełny tekst źródła

Streszczenie:

Large electric transformers such as those used in high voltage substations radiate an annoying low frequency hum into nearby communities. Attempts have been made to actively control the noise by placing a large number of loudspeakers as control sources around noisy transformers to cancel the hum. These cancellation systems require a large number of loudspeakers to be successful due to the imposing size of the transformer structures. Thus such systems are very expensive if global noise reduction is to be achieved. The aim of this thesis is to investigate theoretically and experimentally the use

Style APA, Harvard, Vancouver, ISO itp.

7

Shen, Anne Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Optimised reduction of the radiated noise from the casing of a constant speed gearbox." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2008. http://handle.unsw.edu.au/1959.4/43020.

Pełny tekst źródła

Streszczenie:

This thesis presents a comprehensive methodology for predicting and minimising the noise radiated from a constant speed gearbox assembly by means of attaching optimally placed stiffening ribs on the casing. The procedure involves building an FE model of the gearbox, which is updated using modal parameters extracted from a modal test. This is followed by synthesis of the required FRFs with respect to the forcing degrees-of-freedom. The forces, which are assumed to act only at the bearings are identified from these FRFs and the measured operational velocities of the casing. The identified forces

Style APA, Harvard, Vancouver, ISO itp.

8

Risi, John D. "Analytical investigation of active control of radiated inlet noise from turbofan engines." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-08222009-040623/.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

9

Song, Kyungyeol 1972. "Active control of radiated noise from a cylindrical shell using external piezoelectric panels." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29244.

Pełny tekst źródła

Streszczenie:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.<br>Includes bibliographical references (p. 285-290).<br>Control architectures and methodologies are developed for the reduction of radiated noise from a thick-walled cylindrical shell using external piezoelectric panels. The proposed approach is to cover the shell's outer surface with curved active composite panels, and to reduce the radiated noise by controlling the motion of each panel's outer surface (i.e., the radiating surface), instead of the shell's outer surface. The use of external pie

Style APA, Harvard, Vancouver, ISO itp.

10

Laws, Nathan. "A Parabolic Equation Analysis of the Underwater Noise Radiated by Impact Pile Driving." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1083.

Pełny tekst źródła

Streszczenie:

Impact pile driving can produce extremely high underwater sound levels, which are of increasing environmental concern due to their deleterious effects on marine wildlife. Prediction of underwater sound levels is important to the assessment and mitigation of the environmental impacts caused by pile driving. Current prediction methods are limited and do not account for the dynamic pile driving source, inhomogeneities in bathymetry and sediment, or physics-based sound wave propagation. In this thesis, a computational model is presented that analyzes and predicts the underwater noise radiated by p

Style APA, Harvard, Vancouver, ISO itp.

11

Kastner, Jeffrey F. "Far-field radiated noise mechanisms in high reynolds number and high-speed jets." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1181753004.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

12

Boone, Andrew Johnson. "Active minimization of acoustic energy density to attenuate radiated noise from a diesel generator /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1595.pdf.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

13

Boone, Andrew J. "Active Minimization of Acoustic Energy Density to Attenuate Radiated Noise from a Diesel Generator." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1037.

Pełny tekst źródła

Streszczenie:

The focus of this thesis was to use active noise control (ANC) to globally minimize the tonal and broadband noise radiating from a diesel generator enclosure. The major goal of this research was to show that minimizing the noise within the enclosure can lead to an overall sound pressure level (SPL) reduction of radiated noise. The target levels for overall SPL reduction were at least 2 dBA. The control algorithms used in this research were based on a filtered-x LMS adaptive algorithm, which minimizes energy density (ED). Both feedforward and feedback control approaches were investigated. The n

Style APA, Harvard, Vancouver, ISO itp.

14

Jaouani, Nassim. "Modelling of installation effects on the tonal noise radiated by counter-rotating open rotors." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC002.

Pełny tekst źródła

Streszczenie:

The Counter-Rotating Open Rotors (CROR) are identified as a possible alternative to turbofan engines for middle-range aircrafts. Providing significant fuel savings and reducing the green-house gas emissions, they may lead however to an increased noise radiation due to the absence of nacelle shielding. To properly predict the acoustic radiation of such systems is then mandatory both to reduce the source mechanisms of the isolated engine and to offer an optimal noise installation solution. Such an objective is tackled in the present thesis in two steps. In a first part, the research aims at pred

Style APA, Harvard, Vancouver, ISO itp.

15

Ross, Bradley W. "Attenuation of Low Frequency Structurally Radiated Noise With an Array of Weak Radiating Cells." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36555.

Pełny tekst źródła

Streszczenie:

The concept of a weak sound radiating cell is proposed to reduce the low frequency radiated noise from structures. The cell consists of two coupled surfaces such that, when placed on a vibrating structure, the responses of the two surfaces are nearly out-of-phase and of equal strength over a wide frequency range. This structure response leads the cell to behave as an acoustic dipole and thus as a poor sound radiating source. The control of low frequency structurally radiated noise is then achieved by covering the structure with an array of these weak radiating cells, i.e. surface treatment.

Style APA, Harvard, Vancouver, ISO itp.

16

Lidtke, Artur K. "Predicting radiated noise of marine propellers using acoustic analogies and hybrid Eulerian-Lagrangian cavitation models." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/413579/.

Pełny tekst źródła

Streszczenie:

Anthropogenic noise from a variety of merchant ships has been reported to be a major factor adversely aecting marine organisms. Consequently, scientists and regulators have become more vocal about encouraging, and possibly enforcing, quieter ships in the future. For this to be feasible from an engineering standpoint, a range of numerical methods must be made available to allow acoustic performance of vessels to be evaluated at the design stage. Cavitation is a major contributor to the hydroacoustic signature of a merchant vessel. The reason for this is the relatively high drop of pressure indu

Style APA, Harvard, Vancouver, ISO itp.

17

Duncan, Alexander John. "The measurement of underwater acoustic noise radiated by a vessel using the vessel's own towed array." Curtin University of Technology, Department of Applied Physics, 2003. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16340.

Pełny tekst źródła

Streszczenie:

The work described in this thesis tested the feasibility of using a towed array of hydrophones to: 1. localise sources of underwater acoustic noise radiated by the towvessel, 2. determine the absolute amplitudes of these sources, and 3. determine the resulting far-field acoustic signature of the tow-vessel. The concept was for the towvessel to carry out a U-turn manoeuvre so as to bring the acoustic section of the array into a location suitable for beamforming along the length of the tow-vessel. All three of the above were shown to be feasible using both simulated and field data, although no i

Style APA, Harvard, Vancouver, ISO itp.

18

GEORGE, JOHN K. "ANALYTICAL, NUMERICAL AND EXPERIMENTAL CALCULATION OF SOUND TRANSMISSION LOSS CHARACTERISTICS OF SINGLE WALLED MUFFLER SHELLS." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1181226367.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

19

Kunovský, Martin. "Snižování hluku počítačů obkládáním stěn zvukoizolačními materiály a regulací otáček ventilátorů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229655.

Pełny tekst źródła

Streszczenie:

This thesis deals with the distribution of noise in the computer case and radiation into the neighborhood. Influence of geometrical shape and size of the computer case on radiated noise from the computer was investigated as well as effect of placement of the fan. Reducing noise by using sound absorbing material into computer case and result of the suitable position of the computer in the working environment were also tested. Simulation of the noise diffusion and effectivity of anti-noise equipment was executed in Ansys FEM program.

Style APA, Harvard, Vancouver, ISO itp.

20

Ghangale, Dhananjay. "An efficient methodology based on two-and-a-half-dimensional finite element and boundary element methods for ground-borne vibration radiated by underground railway tunnels and the re-radiated noise emitted inside them." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667304.

Pełny tekst źródła

Streszczenie:

This thesis presents a methodology for assessing induced ground-borne vibration due to Underground railway infrastructures in the context of an urban environment. The methodology is based on a comprehensive numerical approach for modelling track/tunnel/soil systems considering a full-space model of the ground. This approach is formulated in the wavenumber-frequency domain and it is based on coupled finite element-boundary element method. An axisymmetric formulation to deal with circular underground railway tunnels is included in the approach in order to improve the computational speed of the m

Style APA, Harvard, Vancouver, ISO itp.

21

Astfalck, Allen Electrical Engineering Australian Defence Force Academy UNSW. "Analysis of electromagnetic force and noise in inverter driven induction motors." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Electrical Engineering, 2002. http://handle.unsw.edu.au/1959.4/38671.

Pełny tekst źródła

Streszczenie:

This thesis is part of a major research project to analyse vibro-acoustic characteristics from variable speed inverter driven induction motors (VSIDIM). The overall projects??? aimed at providing a better understanding of the mechanisms of sound generation from electromagnetic origins and developing a numerical model to predict the sound power emitted from a VSIDIM. The scope of this thesis is to assess experimentally the effect of various controller strategies on the radiated sound power and to develop a finite element method for calculating the electromagnetic force distribution over the sta

Style APA, Harvard, Vancouver, ISO itp.

22

Yagci, Tayfun. "Target Classification And Recognition Using Underwater Acoustic Signals." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606373/index.pdf.

Pełny tekst źródła

Streszczenie:

Nowadays, fulfillment of the tactical operations in secrecy has great importance for especially subsurface and surface warfare platforms as a result of improvements in weapon technologies. Spreading out of the tactical operations to the larger areas has made discrimination of targets unavoidable. Due to enlargement of the weapon ranges and increasing subtle hostile threats as a result of improving technology, &ldquo<br>visual&rdquo<br>target detection methods left the stage to the computerized acoustic signature detection and evaluation methods. Despite this, the research projects have not s

Style APA, Harvard, Vancouver, ISO itp.

23

Guezgouz, Djamel. "Contribution à la modélisation du réseau électrique domestique en vue de la caractérisation du canal de propagation CPL." Phd thesis, Université François Rabelais - Tours, 2010. http://tel.archives-ouvertes.fr/tel-00922801.

Pełny tekst źródła

Streszczenie:

Le réseau électrique s'utilise aujourd'hui comme support de transmission des signaux Ethernet. C'est le concept des courants porteurs en ligne. Cette technique de transmission permet d'obtenir des débits supérieurs au Wifi. Cependant, la complexité des réseaux électriques et l'environnement électromagnétique domestique peuvent dégrader les performances de cette technologie. L'environnement électrique de l'habitat avec ses appareils électroménagers divers en font un milieu difficilement maitrisable. L'objectif est d'appréhender et de modéliser cet environnement et le comportement des équipement

Style APA, Harvard, Vancouver, ISO itp.

24

Anderson, Monty J. "Active Control of the Human Voice from a Sphere." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5295.

Pełny tekst źródła

Streszczenie:

This work investigates the application of active noise control (ANC) to speech. ANC has had success reducing tonal noise. In this work, that success was extended to noise that is not completely tonal but has some tonal elements such as speech. Limitations such as causality were established on the active control of human speech. An optimal configuration for control actuators was developed for a sphere using a genetic algorithm. The optimal error sensor location was found from exploring the nulls associated with the magnitude of the radiated pressure with reference to the primary pressure field.

Style APA, Harvard, Vancouver, ISO itp.

25

Turcotte, Audrey. "Analyse intra-annuelle des fluctuations radiales des tiges et des racines adventives de l'épinette noire (Picea mariana (Mill. B.S.P.) /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2007. http://theses.uqac.ca.

Pełny tekst źródła

Streszczenie:

Thèse (M.Ress.Renouv.) -- Université du Québec à Chicoutimi, 2007.<br>La p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en ressources renouvelables. CaQCU Bibliogr.: f. [77]-82. Document électronique également accessible en format PDF.

Style APA, Harvard, Vancouver, ISO itp.

26

Sulis, Sophia. "Méthodes statistiques utilisant des simulations hydrodynamiques d'atmosphères stellaires pour détecter des exoplanètes en vitesse radiale." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4073/document.

Pełny tekst źródła

Streszczenie:

Considérant une série temporelle affectée par un bruit coloré dont les propriétés statistiques sont inconnues, la difficulté pour la détection de signaux périodiques est de contrôler le degré de confiance avec lequel les tests de détection rejettent l'hypothèse nulle en faveur de l'hypothèse alternative. L'objectif de cette thèse est de développer une nouvelle méthode utilisant des séries temporelles simulées du bruit pour améliorer ce contrôle. Dans le cas d'un échantillonnage régulier, nous avons analysé les performances de différents tests de détection appliqués à un périodogramme standardi

Style APA, Harvard, Vancouver, ISO itp.

27

Vansteenkiste, Nathalie. "Réalisation d'un laser LNA monomode et asservi sur la transition 23S1-23P de l'hélium 4 (1083nm): utilisation pour quelques expériences de refroidissement radiatif d'atomes d'hélium 4 métastable." Phd thesis, Université Paris Sud - Paris XI, 1989. http://tel.archives-ouvertes.fr/tel-00011867.

Pełny tekst źródła

Streszczenie:

Ce mémoire présente quelques expériences de refroidissement radiatif transverse d'un jet d'hélium 4 métastable sur la transition 23S → 2 3P . Une première partie est consacrée à la description du laser à solide (LNA), en anneau, monomode et asservi sur la raie atomique à 1.083 micron de l'hélium, qui a été construit pour ces expériences. La seconde partie décrit quelques expériences de refroidissement radiatif transverse d'un jet d'hélium métastable qui ont été réalisées avec ce laser ; on y présente en particulier une expérience utilisant un piégeage cohérent de population ("résonance noire")

Style APA, Harvard, Vancouver, ISO itp.

28

Vansteenkiste, Nathalie. "Réalisation d'un laser LNA monomode et asservi sur la transition 2³S₁→ 2³P de l'hélium 4 (1083 nm) : utilisation pour quelques expériences de refroidissemnt radiatif d'atomes d'helium 4 métastable." Paris 11, 1989. http://www.theses.fr/1989PA112336.

Pełny tekst źródła

Streszczenie:

Ce mémoire présente quelques expériences de refroidissement radiatif transverse d'un jet d'hélium 4 métastable sur la transition 23 S 2 3P. Une première partie est consacrée à la description du laser à solide (LNA), en anneau, monomode et asservi sur la raie atomique à 1. 083 micron de l'hélium, qui a été construit pour ces expériences. La seconde partie décrit quelques expériences de refroidissement radiatif transverse d'un jet d'hélium métastable qui ont été réalisées avec ce laser ; on y présente en particulier une expérience utilisant un piégeage cohérent de population ("résonance noire")

Style APA, Harvard, Vancouver, ISO itp.

29

Wang, Lily. "La croissance radiale de l'épinette noire comme indicateur de changements climatiques à la limite des arbres au nord du Québec, Tree-ring growth of black spruce at arctic treeline in northern Québec : implication for climate change." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0022/NQ52266.pdf.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

30

Assice, Antoine. "Detection en ondes millimetriques de defauts dielectriques ou semi-conducteurs dans un materiau a pertes." Toulouse 3, 1987. http://www.theses.fr/1987TOU30182.

Pełny tekst źródła

Streszczenie:

Utilisation de la radiometrie en ondes millimetriques dans la recherche de discontinuites dielectriques dans les materiaux composites. Simulation en ondes millimetriques des variations de puissance qui existent entre la zone homogene et la zone contenant le defaut

Style APA, Harvard, Vancouver, ISO itp.

31

Pasquet, Guillaume. "Conception, réalisation et mise en oeuvre d'un microsystème pour la micro spectroscopie par résonance magnétique nucléaire." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00611547.

Pełny tekst źródła

Streszczenie:

Ce travail de thèse porte sur la conception, la réalisation et l'évaluation expérimentale d' un microsystème d'analyse dont l'originalité repose sur l'intégration d'une micro antenne planaire de spectroscopie par résonance magnétique nucléaire (SRMN) sur un système micro fluidique à base d'un polymère, le Cyclique Oléfine Copolymère (COC). La détermination des caractéristiques géométriques optimales du microsystème afin d'optimiser le couplage électromagnétique entre la micro antenne de détection et l'échantillon est effectuée à l'aide d'un modèle de calcul numérique, ce qui permet l'optimisat

Style APA, Harvard, Vancouver, ISO itp.

32

La, Delfa Patricio. "Contribution à la conception silencieuse par démarches directe et inverse de machines synchrones à aimants permanents et bobinage dentaire." Thesis, Ecole centrale de Lille, 2017. http://www.theses.fr/2017ECLI0036/document.

Pełny tekst źródła

Streszczenie:

Cette thèse porte sur la conception silencieuse par démarches inverses de machines synchrones à aimants permanents dotées de bobinages dentaires. Notre travail se focalise sur l’analyse des raies de forces radiales à l’origine du bruit magnétique. En premier lieu, un modèle direct électromagnétique, nous a permis de déterminer le spectre spatio-temporel de la force radiale dans l’entrefer. Ce dernier nous offre la possibilité d’obtenir pas à pas et de manière analytique l’induction radiale dans l’entrefer, résultat du produit de la force magnétomotrice totale et de la perméance d’entrefer glob

Style APA, Harvard, Vancouver, ISO itp.

33

Výravská, Zdeňka. "Vliv stavební konstrukce na tepelnou zátěž prostoru." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226871.

Pełny tekst źródła

Streszczenie:

This master’s thesis focuses on effect of outer building construction on thermal load of space. The effect of translucent and non-translucent construction is discussed. The project of air-conditioning system is prepared for the two alternatives of the translucent construction, including the purchase price of the airconditioning system and glazing and the savings on summer cooling. Afterwards the period of the recovery of investment is calculated. The plan of the airconditioning system is connected to my bachelor’s thesis “Airconditioning in the car showroom”, the subject of which was the plan

Style APA, Harvard, Vancouver, ISO itp.

34

Wei, David, and 魏宏源. "Ship Hull Vibration And Its Underwater Radiated Noise." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/95307575782451055935.

Pełny tekst źródła

Streszczenie:

碩士<br>國立臺灣大學<br>造船工程學系<br>81<br>The main goal of this paper is to determine the dominant source of the underwater noise radiated from a surface vessel at mid-frequency range. We find that it is not the "MACHINE-NOISE" but the "FLUID -NOISE" resulted from thep propeller. This could be demonstrated by the following arguement according to the experimental data : (1) The amplitude of the plate vibration of the side wall in the machine room of the ship and the water , did not incr

Style APA, Harvard, Vancouver, ISO itp.

35

Chiu, Ching-Chun, and 邱清俊. "Prediction Model of Noise Radiated from a Power Machine Room." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/81783107418732089863.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

36

Petitjean, Benoit P. "On the nonlinearities in the noise radiated from high-speed model jets." 2006. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1668/index.html.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

37

Yang, Ling-Fu, and 楊令甫. "Analysis and Inprovement of the Cable-induced Vibration and Radiated Noise for Cable Car System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/75662857788703213319.

Pełny tekst źródła

Streszczenie:

碩士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>98<br>Cable car system noise impact on the environment. Low-frequency noise caused by local residents would not feel comfortable. So need analysis and improvement of Vibration and Radiated Noise for Cable Car System. The purpose of this study contact for the cable and pulley drive vibration excitation point of the cable and the relationship between speed. The vibration transmitted from the truss to the cylindrical pillar, and cylindrical pillar made noise. Measurement of acceleration of the dynamic characteristics of cylindrical pillar and cable car system ru

Style APA, Harvard, Vancouver, ISO itp.

38

Chang, Chieh-Shih, and 張婕詩. "A comparison of different approaches on the aeroacoustic noise radiated from airfoils for wind turbine blades." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/88173275815678367901.

Pełny tekst źródła

Streszczenie:

碩士<br>國立臺灣大學<br>工程科學及海洋工程學研究所<br>97<br>The purpose of the research is to investigate the noises induced by flow over the wind blades. The noise analysis is conducted by the Broadband Noise Source Model and FW-H (Ffowcs Williams and Hawkings) Formula which are based on theory of Lighthill’s acoustic analogy. How the wind velocity, angle of attack as well as the inflow turbulent intensity influence the induced aerodynamic noise is discussed. First of all, the dynamic coefficients and flow field of three airfoils NACA64(3)-618、S809 and S822 were verified, and then the accurate information of turb

Style APA, Harvard, Vancouver, ISO itp.

39

McIntyre, Duncan. "Predicting cavitation-induced noise from marine propellers." Thesis, 2021. http://hdl.handle.net/1828/12552.

Pełny tekst źródła

Streszczenie:

Noise pollution threatens marine ecosystems, where animals rely heavily on sound for navigation and communication. The largest source of underwater noise from human activity is shipping, and propeller-induced cavitation is the dominant source of noise from ships. Mitigation strategies require accurate methods for predicting cavitation-induced noise, which remains challenging. The present thesis explores prediction and modelling strategies for cavitation-induced noise from marine propellers, and provides insight into models that can be used both during propeller design and to generate intellige

Style APA, Harvard, Vancouver, ISO itp.

40

Tsai, Chien-Chiu, and 蔡建秋. "The study of relevant parameters for traffic-induced vibration and low frequency noise radiated from box-girder bridges." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/92908303974721712655.

Pełny tekst źródła

Streszczenie:

碩士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>100<br>To investigate vehicle trigger the box-bridge girder vibration and low frequency noise problem. This paper is divided into two parts to study, the first part is collecting the exciting force for large vehicle ,the second part is an elevated bridge finite element analysis. By field measurement, this paper discusses the measured whether the trend coincide with the simulation results. In this paper, measuring for large vehicle excitation force at No. 62 highway and comparison with other vehicles exciting force literature , The result show that the vehi

Style APA, Harvard, Vancouver, ISO itp.

41

Krishna, Kumar G. V. "Characterization of Flow Induced Noise Received by an Array Placed at Stagnation Point of an Underwater Axisymmetric Body." Thesis, 2017. http://etd.iisc.ernet.in/2005/3799.

Pełny tekst źródła

Streszczenie:

Given the interest on underwater axisymmetric cylindrical bodies for the development of high-speed underwater weapons, characterization of the boundary layer flow-induced noise received by a Sound NAvigation and Ranging (SONAR) is very important to improve sonar detection ranges. The debate on generating mechanisms of the flow induced noise received at the stagnation point is still on as there is no experimental evidence conclusively suggesting whether it is a near-field or far-field phenomenon, thereby introducing an element of uncertainty in the prediction models. Further, the models develop

Style APA, Harvard, Vancouver, ISO itp.

42

Kao, Jui-Hsiang, and 高瑞祥. "Theoretical Prediction of The Marine Propeller Radiated Blade Rate Noises – Including The Scattering Effect Due to Ship Hull." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/59078857508754789988.

Pełny tekst źródła

Streszczenie:

博士<br>國立臺灣海洋大學<br>系統工程暨造船學系<br>92<br>Abstract The main objective of this thesis is to develop a new and efficient numerical method for predicting the far-field and near-field blade-rate noises of marine propellers operating in a non-uniform ship wake by linear acoustic theory. In addition, both the scattering effect from the ship hull and the reflecting effect from the free surface are included. In the present method, an exact analytic solution satisfying the linear wave equation for predicting acoustic pressure caused by unsteady sheet cavitations, unsteady thrusts and torques can be derived

Style APA, Harvard, Vancouver, ISO itp.

43

Μαραζιώτη, Παναγιώτα. "Ανάπτυξη πειραματικής και υπολογιστικής μεθόδου για την μελέτη αεροθερμοδυναμικού πεδίου και του εκπεμπόμενου θορύβου και ρυπών από συρρέουσες και ανακυκλοφορούσες τυρβώδεις φλόγες προπανίου". Thesis, 2006. http://nemertes.lis.upatras.gr/jspui/handle/10889/1439.

Pełny tekst źródła

Streszczenie:

Η παρούσα διατριβή μελετά τις δυνατότητες υπολογισμού του πεδίου ροής δύο λειτουργικών παραμέτρων συμπεριλαμβανομένων του εκπεμπόμενου θορύβου και των εκπεμπόμενων ρύπων. Εξετάζεται η αλληλεπίδραση της καύσης με το ρευστο-θερμοδυναμικό πεδίο και τις χημικές αντιδράσεις. Περιγράφονται συνοπτικά οι διέπουσες εξισώσεις, οι μέθοδοι και τα μοντέλα της τυρβώδους καύσης και επισημαίνονται τα πλεονεκτήματα του μοντέλου των μεγάλων δινών (LES) το οποίο επιλέχθηκε εδώ. Αναπτύσσεται ένας εύχρηστος, από την ρευστοδυναμική υπολογιστική μεθοδολογία, πολυβηματικός μηχανισμός για δύο καύσιμα άμεσου ε

Style APA, Harvard, Vancouver, ISO itp.

44

Turcotte, Audrey. "Analyse intra-annuelle des fluctuations radiales des tiges et des racines adventives de l'épinette noire (Picea mariana (Mill. B.S.P.)." Thèse, 2007. http://constellation.uqac.ca/413/1/25024861.pdf.

Pełny tekst źródła

Streszczenie:

Les fluctuations radiales des tissus des tiges et des racines d'épinette noire ont été enregistrées entre août 2004 et octobre 2005 en utilisant des dendromètres à pointe automatiques pour déterminer si le retour des fonctions hydriques normales limite le début de la croissance cambiale secondaire. En divisant les fluctuations radiales des tissus en phases de contraction, d'expansion et d'accroissement, des cycles de déshydratation et réhydratation des tissus furent définis. L'amplitude et la durée de chaque phase et des cycles complets ont été mesurées. Les cycles furent classifies selon quat

Style APA, Harvard, Vancouver, ISO itp.

45

Laplante, Sandy. "Effet de l'éclaircie précommerciale et de l'éclaircie commerciale radiale et la qualité du bois de l'épinette noire de la sapinière à bouleau blanc du Saguenay-Lac-Saint-Jean." Thèse, 2009. http://constellation.uqac.ca/153/1/030113946.pdf.

Pełny tekst źródła

Streszczenie:

Les éclaircies précommerciales (EPC) et commerciales (EC) ont été appliquées récemment dans la forêt boréale du Québec dans le but d'accroître la croissance radiale d'une forêt afin de la garder stable et productive jusqu'à sa maturité. Le but principal de l'étude était d'établir une relation entre la croissance radiale des arbres et la qualité du bois dans les peuplements d'épinette noire (Picea mariana (Mill.) B.S.P.) traités par l'éclaircie. Un effectif de 35 arbres par site totalisant 10 sites EPC, 10 sites EC et 4 sites témoins a été mesuré, échantillonné puis analysé selon trois volets d

Style APA, Harvard, Vancouver, ISO itp.

Oferujemy zniżki na wszystkie plany premium dla autorów, których prace zostały uwzględnione w tematycznych zestawieniach literatury. Skontaktuj się z nami, aby uzyskać unikalny kod promocyjny!