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Dissertations / Theses on the topic 'Aircraft Noise'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Ionescu, Irina Gabriela. "Aircraft noise regulation." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82660.

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Aircraft noise is one of the most controversial environmental concerns in the aviation industry, partly due to the difficulty in harmonizing countries' regulation regarding this issue. The purpose of this thesis is to analyze the ways in which aircraft noise is regulated at the national and international levels, and to compare the legislative responses to aircraft noise issues in Europe and North America. Each of the four main chapters of the thesis takes into consideration a different aspect of the problem. The first chapter describes the objective and subjective ways of measuring airc
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2

彭遠輝 and Yuen-fai Alson Pang. "Managing aircraft noise." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31255280.

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3

Pang, Yuen-fai Alson. "Managing aircraft noise /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2543598x.

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4

Heffernon, Timothy James. "Aircraft noise installation effects." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/415885/.

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Airframe noise is currently of a comparable level to engine noise for an aircraft on approach with high-lift devices and landing gears deployed. The landing gears are a large contributor to the overall airframe noise in this situation. Main landing gears are typically installed beneath a lifting wing. The wing surfaces act as scattering surfaces for the noise generated by these landing gears, and the non-uniform flow around the wing affects both the propagation and strength of the noise. This thesis focuses on investigating the propagation and scattering of installed landing gear noise sources
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5

Gualandi, Nicola <1978&gt. "Aircraft noise performance evaluation and airport noise management." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1356/1/Gualandi_Nicola_Aircraft_noise_performance_evaluation_and_airport_noise_management.pdf.

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6

Gualandi, Nicola <1978&gt. "Aircraft noise performance evaluation and airport noise management." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1356/.

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7

Copley-Woods, Djuna S. (Djuna Sunlight) 1977. "Aircraft interior acoustic noise control." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9330.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.<br>Includes bibliographical references (p. 45).<br>An experimental study was perfonned to determine which materials are best suited for internal aircraft noise reduction. An impedance tube with dimensions of a scaled aircraft was constructed and evaluated, and eleven materials were tested and compared based on their noise reduction properties, weight, and thickness. Polyvinylidene Fluoride was tested for use in active noise control for a large space.<br>by Djuna S. Copley-Woods.<br>S.B.
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8

Rodriguez, Garcia Paul. "Aircraft turbine combustion noise processing." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/413857/.

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Appraisal of the noise produced at the combustion stage in a jet engine is becoming more important, as fan and jet noise have been significantly reduced over many years. Therefore, combustion noise is contributing more to overall noise, especially at low jet velocities. Environmental regulations stipulate that gas emissions from a jet engine should be reduced. Thus, new techniques have been introduced in their operation, especially concerning the combustion process. Accordingly, there is a need for improved processing methods in order to extract combustion noise from other sources in new build
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9

Dickson, Crispin. "A few aspects of aircraft noise." Licentiate thesis, Stockholm : Teknisk akustik, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4510.

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10

Morrell, Stephen L. "Aircraft noise and child blood pressure." Connect to full text, 2003. http://hdl.handle.net/2123/594.

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Thesis (Ph. D.)--University of Sydney, 2003.<br>Title from title screen (viewed Apr. 29, 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Public Health, Faculty of Medicine. Includes bibliography. Also available in print form.
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11

Morrell, Stephen Louis. "Aircraft noise and child blood pressure." Thesis, The University of Sydney, 2003. http://hdl.handle.net/2123/594.

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The purpose of the study was to examine the existence of an association between child blood pressure (BP) and exposure to domestic jet aircraft noise in the context of the construction of a new parallel north-south runway at Sydney (Kingsford-Smith) Airport. The baseline study was commissioned and funded by the Federal Airports Corporation (FAC), with measurements conducted in 1994 and 1995. A follow-up longitudinal component to the study was subsequently commissioned and funded by the FAC in 1997, and measurements conducted in the same year. As the same individuals were measured and re
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12

Morrell, Stephen Louis. "Aircraft noise and child blood pressure." University of Sydney. Public Health, 2003. http://hdl.handle.net/2123/594.

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The purpose of the study was to examine the existence of an association between child blood pressure (BP) and exposure to domestic jet aircraft noise in the context of the construction of a new parallel north-south runway at Sydney (Kingsford-Smith) Airport. The baseline study was commissioned and funded by the Federal Airports Corporation (FAC), with measurements conducted in 1994 and 1995. A follow-up longitudinal component to the study was subsequently commissioned and funded by the FAC in 1997, and measurements conducted in the same year. As the same individuals were measured and re
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13

Smith, Corne J. "Feedforward active noise reduction for aircraft headsets." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/49761.

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Thesis (MScEng)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: Active noise reduction (ANR) is a method of cancelling acoustic noise in a defined enclosure. Two methods exist to implement ANR, they are the analog feedback method and the digital feedforward method. Commercial ANR systems employing feedback methods have been around since the 1980's. Feedforward methods have however only become practically implemental with the age of fast real time digital signal processing. In current systems, feedback ANR is used to attenuate broadband noise whilst feedforward methods are used to
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14

Nchemanyi, John Ngeh. "Community perceptions on noise pollution generated by aircraft in Cape Town." Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/781.

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Thesis (MTech (Environmental Health))--Cape Peninsula University of Technology, 2006<br>Airport operations have become a major source of concern due to aircraft nOIse, particularly in areas close to airports and aircraft flight tracks. Public opposition to aircraft noise is a threat to the continued growth of civil aviation in South Africa. This study investigated the psychological effects of aircraft noise on residents and school activities at a neighbourhood close to the airport, particularly the area located under the flight tracks or adjacent to the landing and departure pattern of aircraf
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15

GAGLIARDI, PAOLO. "A study of airport noise impact and strategies for its mitigation and exposure reduction." Doctoral thesis, Università di Siena, 2017. http://hdl.handle.net/11365/1013780.

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Aviation noise pollution in urban areas can be considered as a major problem and source of conflict between airport infrastructure and residents. Its effects could significantly limit the growth of aviation as well as affect public health, mainly when airports are located near residential areas. Noise control measures both at the source and at the receivers are often expensive and limited. Nevertheless, they represent the most viable solutions for contrasting this phenomenon due to the difficulty of finding suitable measures to reduce aircraft noise along its propagation path. This work is foc
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16

Weed, Philip Andrew. "Hybrid wing-body aircraft noise and performance assessment." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62320.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2010.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 89-92).<br>Hybrid wing-body aircraft noise generation and boundary layer ingestion (BLI) performance trends with increased fan face Mach number inlet designs are investigated. The presented topics are in support of the NASA subsonic fixed wing proje
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17

Leifsson, Leifur Thor. "Multidisciplinary Design Optimization of Low-Noise Transport Aircraft." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/26327.

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The objective of this research is to examine how to design low-noise transport aircraft using Multidisciplinary Design Optimization (MDO). The subject is approached by designing for low-noise both implicitly and explicitly. The explicit design approach involves optimizing an aircraft while explicitly constraining the noise level. An MDO framework capable of optimizing both a cantilever wing and a Strut-Braced-Wing (SBW) aircraft was developed. The framework employs aircraft analysis codes previously developed at the Multidisciplinary Design and Analysis (MAD) Center at Virginia Tech (VT). The
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18

Krueger, David William. "Array-Based Characterization of Military Jet Aircraft Noise." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3676.

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Since the 1950s the jet aeroacoustics community has been involved in predicting and measuring the noise distribution in jets. In this work, cylindrical and planar Fourier near-field acoustical holography are used to investigate radiation from a full-scale, installed jet engine. Practical problems involving measurement aperture and the highly directional nature of the source are addressed. Insights from numerical simulations reveal usable reconstruction regions. A comparison of cylindrical and planar NAH for the respective measurement apertures shows cylindrical NAH outperforms planar NAH on re
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19

Prats, Xavier. "Contributions to the Optimisation of aircraft noise abatement procedures." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/5929.

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Tot i que en les últimes dècades la reducció del soroll emès pels avions ha estat substancial, el seu impacte a la població ubicada a prop dels aeroports és un problema que encara persisteix. Contenir el soroll generat per les operacions d'aeronaus, tot assumint al mateix temps la creixent demanda de vols, és un dels principals desafiaments a que s'enfronten les autoritats aeroportuàries, els proveïdors de serveis per a la navegació aèria i els operadors de les aeronaus. A part de millorar l'aerodinàmica o les emissions sonores de les aeronaus, l'impacte acústic de les seves operacions es po
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20

Prats, Menéndez Xavier. "Contributions to the Optimisation of aircraft noise abatement procedures." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/5929.

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Tot i que en les últimes dècades la reducció del soroll emès pels avions ha estat substancial, el seu impacte a la població ubicada a prop dels aeroports és un problema que encara persisteix. Contenir el soroll generat per les operacions d'aeronaus, tot assumint al mateix temps la creixent demanda de vols, és un dels principals desafiaments a que s'enfronten les autoritats aeroportuàries, els proveïdors de serveis per a la navegació aèria i els operadors de les aeronaus. A part de millorar l'aerodinàmica o les emissions sonores de les aeronaus, l'impacte acústic de les seves operacions es po
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21

Prinn, Albert. "Efficient finite element methods for aircraft engine noise prediction." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/372766/.

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Aircraft noise has a negative environmental impact. One of the ways in which it can be mitigated is by placing acoustic liners inside the aircraft's engines. These liners can be optimised for noise reduction. A cost effective way to optimise acoustic liners is to make use of numerical modelling. However, there is room for improvement of the efficiency of current modelling methods. This thesis is concerned with the efficient numerical prediction of noise emitted from modern aircraft engines. Four high order finite element methods are used to solve the convected wave equation, and their performa
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22

Idrisi, Kamal. "Heterogeneous (HG) Blankets for Improved Aircraft Interior Noise Reduction." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29678.

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This study involves the modeling and optimization of heterogeneous (HG) blankets for improved reduction of the sound transmission through double-panel systems at low frequencies. HG blankets consist of poro-elastic media with small, embedded masses, operating similar to a distributed mass-spring-damper system. Although most traditional poro-elastic materials have failed to effectively reduce low-frequency, radiated sound from structures, HG blankets show significant potential. A design tool predicting the response of a single-bay double panel system (DPS) with, acoustic cavity, HG blanket and
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23

Dimino, Ignazio. "Smart panels for active noise control in aircraft cabin." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/14605.

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Active noise control is a key technology to enhance aircraft cabin comfort. This reflects the view of a vast amount of research aimed at reducing cabin noise levels by tackling structural vibration of the fuselage sidewalls. Aircraft interior trim panels and windows are characterized by poor sound transmission loss behaviour at low frequencies as a result of the mass-air-mass resonance phenomena. For next-generation transport aircraft, their impact on the cabin vibroacoustic environment is expected to become increasingly important with the upcoming use of larger passive windows providing a wea
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24

Robert, Rene Jean. "Measuring noise level reduction using an artificial noise source." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54480.

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Buildings located near airports may be subjected to significant noise levels due to aircraft flyovers. Aircraft noise is particularly annoying when compared to other traffic noises due to its intermittent nature. While noise control is typically performed at the source, sound insulation programs are in place to improve the acoustic performance of a residence affected by the flyovers. Noise Level Reduction (NLR) is a common metric used in the United States to determine whether a residence qualifies for such programs. Sound insulation programs are available to houses that have an indoor Day Nigh
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25

Prentice, Philip Ridley. "Asymptotic waveforms in propeller acoustics." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282923.

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26

Jayaraman, Shankar. "Dynamic cutback optimization." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33812.

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The focus of this thesis is to develop and evaluate a cutback noise minimization process - also known as dynamic cutback optimization - that considers engine spool down during thrust cutback and is consistent with ICAO and FAR Part 36 noise certification procedures. Simplified methods for flyover EPNL prediction used by propulsion designers assume instantaneous thrust reduction and do not take into account the spooling down of the engine during the cutback procedure. The thesis investigates if there is an additional noise benefit that can be gained by modeling the engine spool down behavior.
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27

Rhodes, Darren P. "The sensitivity of noise in the community to changes in aircraft design parameters and operating practices." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/27110.

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Environmental factors, such as noise and emissions have begun to play a significant role in the design of new aircraft. Although advances in propulsion technology have reduced source noise levels significantly over the past few decades, it is becoming increasingly difficult to project similar advances for the next few decades. It is likely however that some noise benefits may come from improvements in aircraft performance and from changes in operational procedures. In order for such developments to be analysed at the conceptual design stage, an integrated conceptual aircraft design and aircraf
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28

Thomas, Ashwin Paul. "Simulated and laboratory models of aircraft sound transmission." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52319.

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With increased exposure to transportation noise, there have been continued efforts to help insulate homes from aircraft noise. Current aircraft noise guidelines are based primarily on outdoor sound levels. As people spend the majority of their time indoors, however, human perception is evidently more related to indoor sound levels. Investigations are being made to provide further insight into how typical residential constructions affect indoor response. A pilot study has built a single-room "test house", according to typical construction for mixed-humid climate regions, and has directly measur
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29

Wright, Philip. "Extending the scope of unattended environmental noise monitoring." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320714.

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30

Sahai, Abhishek Kumar [Verfasser], Eike [Akademischer Betreuer] Stumpf, and Dick [Akademischer Betreuer] Simons. "Consideration of aircraft noise annoyance during conceptual aircraft design / Abhishek Kumar Sahai ; Eike Stumpf, Dick Simons." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130151638/34.

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31

Lopes, Leonard Vincent Brentner Kenneth S. "A new approach to complete aircraft landing gear noise prediction." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4401/index.html.

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32

Schünfeldt, Deidré Ashlene. "Aircraft noise : an analysis on the national and international level." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23965.

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Air transportation, while having many benefits, has raised numerous environmental concerns, one of the most contentious being aircraft noise. Thus, the national and international communities have been forced to take measures to cope with this problem, seeking to balance the needs of all interested parties.<br>The purpose of this thesis is to analyze the aircraft noise problem on the national and international levels. Each chapter highlights a distinct area of the problem. Chapter 1 covers the technical aspects of aircraft noise measurement, as well as recounts the general history, sources and
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33

Wolfenden, Andrew. "The effects of aircraft noise on avian communities and communication." Thesis, Manchester Metropolitan University, 2017. http://e-space.mmu.ac.uk/618920/.

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Noise generated by low-altitude aircraft movements reaches levels higher than many other anthropogenic noise sources. How birds respond to these acute noise levels is, to date, poorly understood. This thesis provides some of the first data on how noise generated by aircraft affects avian communities and communication. Firstly, point counts conducted around Manchester airport show there is no effect of increasing noise levels on beta diversity. In addition, results show the density and abundance of the two most abundant species and the number of detections for the five most common species was a
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34

Synodinos, Athanasios. "A new framework for estimating noise impact of novel aircraft." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/416509/.

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Air traffic demand is forecast to significantly grow during the next few years. To compensate for the associated potential increase of aviation environmental impact, ambitious aircraft noise and emissions reduction goals have been set by several organisations worldwide. Accommodating these goals requires planning new mitigation strategies involving technological advances, optimised flight operations, and novel aircraft concepts. Methods for predicting the impact of potential mitigation strategies is vital to support effective planning. This thesis presents a new framework for estimating the no
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35

Adetifa, Oluwaseun Emmanuel. "Prediction of supersonic fan noise generated by turbofan aircraft engines." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/388030/.

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Prediction of Supersonic Fan Noise Generated by Turbofan Aircraft Engines was focussed on improving the capability of predicting supersonic fan noise from modern high-bypass-ratio turbofan aero-engines. The shift from single core jet engines to highbypass-ratio turbofan engines brought about a reduction in the overall aircraft engine noise principally by reducing the jet-broadband noise. However, this new design meant the size of the fan of a high-bypass-ratio turbofan engine, over subsequent years, has increased in diameter. This increase allowed for the speed of the tips of the fan blades to
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36

Lam, Yee-man, and 林綺雯. "GIS in aircraft noise exposure assessment, Tsuen Wan district, Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29961324.

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37

Nabinger, Luciano Baldino. "Medições de ruído aeronáutico dentro da área II do Plano Específico de Zoneamento de Ruído do Aeroporto Salgado Filho, Porto Alegre, RS." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/7962.

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Este trabalho expõe e analisa resultados de medições acústicas de aeronaves; realizadas dentro da Área II do Plano Específico de Zoneamento de Ruído- PEZR. O plano restringe o uso do solo em decorrência das emissões sonoras, oriundas da movimentação das aeronaves para cada um dos 66 aeroportos brasileiros administrados pela INFRAERO. As medições acústicas foram realizadas entre segunda e sexta feira, no período diurno (entre 7 e 22 horas) registrando um total de 697 eventos sonoros aeronáuticos, gerados por 62 modelos diferentes de aeronaves. Os procedimentos de aquisição de dados atendem a IS
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38

Firesheets, Nathan. "Modeling the transmission loss of typical home constructions exposed to aircraft noise." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50133.

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Current aircraft noise guidelines are based primarily on outdoor sound levels. However, human perception is highly related to indoor response, particularly for residences. A research project has been conducted that provides insight into how typical residential dwelling envelopes affect sound transmitted indoors. A focus has been placed on the effect of residential dwelling envelopes on subsonic civil aircraft noise. Typical construction types across the United States have been identified and used to develop model predictions of outdoor-to-indoor transmission loss. While it was initially hypoth
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Gervais, Marc. "Tiltrotor noise reduction through flight trajectory management and aircraft configuration control." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1888.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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de, Luis Jorge. "A Process for the Quantification of Aircraft Noise and Emissions Interdependencies." Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24618.

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The main purpose of this dissertation is to develop a process to improve actual policy-making procedures in terms of aviation environmental effects. This research work expands current practices with physics based publicly available models. The process herein proposed provides information regarding the interdependencies between the environmental effects of aircraft. These interdependencies are also tied to the actual physical parameters of the aircraft and the engine, making it more intuitive for decision-makers to understand the impacts to the vehicle due to different policy scenarios. These s
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Jones, Anya Rachel. "Multidisciplinary optimization of aircraft design and takeoff operations for low noise." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/35293.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2006.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 133-137).<br>Aircraft planform design, takeoff operations, and airfoil design are examined as a complete system in order to quantify tradeoffs that can result in a quiet aircraft. An aircraft design model was developed to generate blended-wing-body-type designs using simple-physics models and empirical scal
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42

Ho, Nhut Tan 1974. "Design of aircraft noise abatement approach procedures for near-term implementation." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30340.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2005.<br>Includes bibliographical references (p. 116-119).<br>Advanced aircraft noise abatement approach procedures -- characterized by decelerating, continuous descent approaches using idle thrust, and enabled by flight guidance technologies such as GPS and FMS -- have been shown to reduce operational aircraft noise on communities surrounding airports. However, implementation in the near future presents two challenges. The first is to mitigate the adverse effects on aircraft performance of uncert
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43

Johansson, Sven. "Active Control of Propeller-Induced Noise in Aircraft : Algorithms & Methods." Doctoral thesis, Karlskrona, Ronneby : Blekinge Institute of Technology, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00171.

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In the last decade acoustic noise has become more and more regarded as a problem. In cars, boats, trains and aircraft, low-frequency noise reduces comfort. Lightweight materials and more powerful engines are used in high-speed vehicles, resulting in a general increase in interior noise levels. Low-frequency noise is annoying and during periods of long exposure it causes fatigue and discomfort. The masking effect which low-frequency noise has on speech reduces speech intelligibility. Low-frequency noise is sought to be attenuated in a wide range of applications in order to improve comfort and s
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44

Reichman, Brent Owen. "Time-Domain Characterization of Nonlinear Propagation in Military Aircraft Jet Noise." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/9263.

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Nonlinear propagation and shock formation are shown in noise radiated from full-scale military jet aircraft. Perception of sound is not only affected by the overall sound pressure level of the noise, but also characteristics of the sound itself. In the case of jet noise, acoustic shocks within the waveforms result in a characteristic commonly referred to as"crackle." The origin of shocks in the far-field of jet noise is shown to be through nonlinear propagation. Metrics characterizing the shock content of a waveform are explained and given physical significance, then applied to jet noise at v
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Vaughn, Aaron Burton. "Physical Characterization of Crackle-Related Events in Military Jet Aircraft Noise." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/9039.

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Crackle is a perceptual feature of supersonic jet noise that is related to the presence of acoustic shocks. The skewness of the time-derivative of the pressure waveform, or derivative skewness, is used as a metric indicative of crackle perception. The three main objectives of this work are: 1) Determine the potential spatial origin of crackle-related events in the near field of a high-performance military aircraft via an event-based beamforming method. 2) Investigate the potential for nonlinear, irregular shock reflections occurring along the near-field ground array and their implications on
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46

Saunders, Christopher A. II. "Noise Reduction in an Axisymmetric Supersonic Aircraft Inlet using Trailing Edge Blowing." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/31385.

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Acoustic experiments were conducted in an anechoic chamber with a 1/14th scale model of a supersonic aircraft engine inlet using Trailing Edge Blowing (TEB) to reduce the engine fan noise from a turbofan propulsion simulator (TPS). The TPS is 4.1 in. (10.4 cm) in diameter and is powered by compressed air. The supersonic inlet is connected to the TPS and is geometrically and acoustically scaled from a working design. The supersonic inlet is operated in a takeoff or landing operating condition where the inlet core flow is subsonic. TEB is the process of ejecting high pressure air to re-energ
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47

Aljets, Dirk. "Acoustic emission source location in composite aircraft structures using modal analysis." Thesis, University of South Wales, 2011. https://pure.southwales.ac.uk/en/studentthesis/acoustic-emission-source-location-in-composite-aircraft-structures-using-modal-analysis(6871e94b-6e94-4efd-b563-41b254ee27b4).html.

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The aim of this research work was to develop an Acoustic Emission (AE) source location method suitable for Structural Health Monitoring (SHM) of composite aircraft structures. Therefore useful key signal features and sensor configurations were identified and the proposed method was validated using both artificially generated AE as well as actual AE resulting from damage. Acoustic Emission is a phenomenon where waves are generated in stressed materials. These waves travel through the material and can be detected with suitable sensors on the surface of the structure. These stress waves are attri
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48

Bardell, N. S. "Wave propagation in periodically stiffened plates and shells." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256281.

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49

Hövelmann, Andreas. "Aerodynamic investigations of noise-reducing high-lift systems for passenger transport aircraft." Thesis, KTH, Flygdynamik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32875.

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This diploma thesis captures the three-dimensional implementation of noise-reducing high-liftsystems. A parametric CAD model is developed for the FNG aircraft and different high-lift configurationsare built up. In the course of research, these configurations are designed based onformerly obtained two-dimensional results of DLR’s LEISA project featuring the design of a verylong chord slat (VLCS), whose slat shape resulted in a favourable aeroacoustic behaviour at noiserelevantapproach conditions. The high-lift systems derived in this thesis differ in the spanwisevariation of the slat geometry p
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Montazami, Azadeh. "Aircraft noise, overheating and poor air quality in London primary schools' classrooms." Thesis, London Metropolitan University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555145.

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Providing a comfortable environment is the fundamental aim in Architecture. Comfortable environment mainly refers to a surrounding atmosphere which is thermally, acoustically, visually, aesthetically, etc. comfortable. Generally, environmental comfort is assessed by environmental factors such as thermal, acoustic and lighting comfort as well as air quality. There is a significant relationship between various environmental factors and students' academic achievements as well as health. Providing all of the environmental factors together is critical as they are interrelated and could conflict if
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