Rozprawy doktorskie na temat „Acoustics”
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Liddy, David W. Holmes John F. "Acoustic room de-reverberation using time-reversal acoustics /". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA374579.
Pełny tekst źródła"September 1999". Thesis advisor(s):, Andrés Larraza, Bruce C. Denardo. Includes bibliographical references (p. 49). Also available online.
Liddy, David W., i John F. Holmes. "Acoustic room de-reverberation using time-reversal acoustics". Thesis, Monterey, California: Naval Postgraduate School, 1999. http://hdl.handle.net/10945/13698.
Pełny tekst źródłaSmurzynski, Jacek. "Acoustic Foundations of Signal Enhancement and Room Acoustics". Digital Commons @ East Tennessee State University, 2007. https://www.amzn.com/1597565628.
Pełny tekst źródłaAjaz, Mahnoor. "Finite Difference Time Domain Modelling of Ultrasonic Parametric Arrays in Two-Dimensional Spaces". The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1619109761801613.
Pełny tekst źródłaAlenius, Emma. "Flow Duct Acoustics : An LES Approach". Doctoral thesis, KTH, MWL Strömningsakustik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104777.
Pełny tekst źródłaQC 20121113
Zou, Chengzhe. "Structural Acoustics of Reconfigurable Tessellated Arrays for Acoustic Energy Guiding". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574285872850491.
Pełny tekst źródłaKriewaldt, Hannah A. "Communications performance of an undersea acoustic wide-area network". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FKriewaldt.pdf.
Pełny tekst źródłaThesis Advisor(s): Joseph A. Rice. "March 2006." Includes bibliographical references (p.57-59). Also available online.
Chen, Zhixin. "An investigation of acoustic impulse response measurement and modeling for small rooms". Diss., Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/chen/ChenZ1207.pdf.
Pełny tekst źródłaWard, Gareth Paul. "The manipulation of sound with acoustic metamaterials". Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/29774.
Pełny tekst źródłaSusbilla, Robert Tayag. "Casimir acoustics". Thesis, Monterey, California. Naval Postgraduate School, 1996. http://hdl.handle.net/10945/8062.
Pełny tekst źródłaWhen the indirect manifestations of the electromagnetic ZPF are interpreted as due to radiation pressure, acoustic noise can render an excellent analog to probe previous as well as recently proposed behavior. An acoustic chamber for isotropic and homogeneous acoustic noise of controllable spectral shape has been built. The noise can be driven up to levels of 130 dB (re 20 microPa) in a band of frequencies up to 50 kHz wide. When driving the system with broadband noise, it will be used (1) to test the Galilean invariance of a spectral shape proportional to the square of the frequency, (2) the force of attraction between parallel plates (analog to Casimir force), (3) the acoustic radiation emitted by a cavity that is made to oscillate at high frequencies (analog to the proposed Casimir radiation), (4) the change in the frequency of oscillation of a pendulum as the noise intensity is varied (analog to the proposed origin of inertia), and (5) the force of attraction between two spheres due to the acoustic shadow that each one casts onto the other (analog to van der Waals force and the proposed origin of gravitation).
Chang, Ding-chen. "Underwater acoustic pulse propagation using the Recursive Ray Acoustics (RRA) Algorithm". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA303441.
Pełny tekst źródłaDurany, Vendrell Jaume. "Geometrical room acoustics: ray based simulation for room acoustics". Doctoral thesis, Universitat Pompeu Fabra, 2016. http://hdl.handle.net/10803/395190.
Pełny tekst źródłaRoom acoustics is the science devoted to study sound propagation in enclosures where the sound conduction medium is bounded on all sides by walls, ceiling and floor. The acoustic information of any room, the so-called impulse response, is expressed in terms of the acoustic field as a function of space and time. The analytical formulation of the sound variables distribution is, in general, extremely hard to obtain and there only exist solutions of very simple and unrealistic scenarios. Therefore the use of computers for solving this type of problems has emerged as a proper alternative to calculate impulse responses. In this Thesis we focus on the use of the ray-based methods to compute impulse responses. More precisely, we present the design and implementation of a sound ray tracing engine that computes the impulse response in any given environment not only for the pressure but also for the velocity vector of the acoustic field. With this extra information we have all the necessary data to model the propagation of sound and we can then naturally spatialize the sound to any speakers layout. This research contributes to the main aspects in the computation of impulse responses using a ray-based approach. The presented ray tracing engine includes a method developed to apply the analytical solution for the Acoustic Bidirectional Reflectance Distribution Function (A-BRDF) in the Vector Based Scattering Model (VBS), which reduces dramatically the computational cost.
Wu, Xiao-Feng. "Variational principles for acoustic radiation and diffraction from underwater structures". Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/17377.
Pełny tekst źródłaKeeser, Christopher Corson. "Shallow under water communication with passive phase conjugation and iterative demodulation and decoding". Pullman, Wash. : Washington State University, 2008. http://www.dissertations.wsu.edu/Thesis/Fall2008/c_keeser_112408.pdf.
Pełny tekst źródłaTitle from PDF title page (viewed on Jan. 21, 2009). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 51-53)
Jung, Du San. "Detection of binary phase-shift keying signal in multioath propagation". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FJung.pdf.
Pełny tekst źródłaAngelopoulos, Pavlos. "Direct-sequence spread-spectrum acoustic communications with CRV Decomposition". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FAngelopoulos.pdf.
Pełny tekst źródłaThesis advisor(s): Roberto Cristi, Kevin B. Smith. Includes bibliographical references (p. 91-94). Also available online.
Hurrell, Andrew M. "Finite difference modelling of acoustic propagation and its applications in underwater acoustics". Thesis, University of Bath, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250842.
Pełny tekst źródłaCates, Andrew Thomas. "Nonlinear diffractive acoustics". Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315809.
Pełny tekst źródłaOnur, Cagla. "Acoustic Tracking Of Ship Wakes". Phd thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615656/index.pdf.
Pełny tekst źródłaKenney, Debra M. "A short water-filled pulse tube for the measurement of the acoustic properties of materials at low frequencies". Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/16671.
Pełny tekst źródłaRoot, Joseph Andrew. "Capabilities of an underwater acoustic volumetric array using time-reversal". Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/18944.
Pełny tekst źródłaWoods, Simon Nicholas. "Acoustic Inspection of Timber". Thesis, University of Canterbury. Electrical and Computer Engineering, 2006. http://hdl.handle.net/10092/3679.
Pełny tekst źródłaKumon, Ronald Edward. "Nonlinear surface acoustic waves in cubic crystals /". Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Pełny tekst źródłaSineiro, Guilherme da Silva. "Underwater multimode directional transducer evaluation". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FSineiro.pdf.
Pełny tekst źródłaThesis advisor(s): Thomas J. Hofler, Joseph A. Rice. Includes bibliographical references (p. 53-54). Also available online.
Dessalermos, Spyridon. "Undersea acoustic propagation channel estimation". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Jun%5FDessalermos.pdf.
Pełny tekst źródłaThesis Advisor(s): Joseph Rice, Roberto Cristi. Includes bibliographical references (p. 117-119). Also available online.
Fabre, Josette. "Representative Environments for Reduced Estimation Time of Wide Area Acoustic Performance". ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1156.
Pełny tekst źródłaBechwati, Fouad. "Acoustics of activated carbon". Thesis, University of Salford, 2008. http://usir.salford.ac.uk/26573/.
Pełny tekst źródłaKang, Jian. "Acoustics of long enclosures". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266240.
Pełny tekst źródłaJames, Duncan Stuart. "Acoustics of cohesive sediments". Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323344.
Pełny tekst źródłaThompson, Philip R. Z. (Philip Reed Zane). "Space, time and acoustics". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/78997.
Pełny tekst źródłaIncludes bibliographical references (leaves 156-159).
This thesis describes the development of new concepts in acoustical analysis from their inception to implementation as a computer design tool. Research is focused on a computer program which aids the designer to visually conceive the interactions of acoustics within a geometrical~y defined environment by synthesizing the propagation of sound in a three dimensional space over time. Information is communicated through a unique use of images that are better suited for interfacing with the design process. The first part of this thesis describes the concepts behind the development of a graphic acoustical rendering program to a working level. This involves the development of a computer ray tracing prototype that is sufficiently powerful to explore the issues facing this new design and analysis methodology. The second part uses this program to evaluate existing performance spaces in order to establish qualitative criteria in a new visual format. Representational issues relating to the visual perception of acoustic spaces are also explored. In the third part, the program is integrated into the design process. I apply this acoustical tool to an actual design situation by remodeling a large performance hall in Medford, Massachusetts. Chevalier Auditorium is a real project, commissioned by the city of Medford, whose program requirements closely match my intentions in scope, scale and nature of a design for exploring this new acoustical analysis and design methodology. Finally, I summarize this program's effectiveness and discuss its potential in more sophisticated future design environments.
by Philip R.Z. Thompson.
M.Arch.
Rendón, Pablo Luis. "Problems in nonlinear acoustics". Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621365.
Pełny tekst źródłaDeal, Thomas J. "Reciprocity in vector acoustics". Thesis, Monterey, California: Naval Postgraduate School, 2017. http://hdl.handle.net/10945/52968.
Pełny tekst źródłaReissued 30 May 2017 with Second Reader’s non-NPS affiliation added to title page.
The scalar reciprocity equation commonly stated in underwater acoustics relates pressure fields and monopole sources. It is often used to predict the pressure measured by a hydrophone for multiple source locations by placing a source at the hydrophone location and calculating the field everywhere for that source. That method, however, does not work when calculating the orthogonal components of the velocity field measured by a fixed receiver. This thesis derives a vector-scalar reciprocity equation that accounts for both monopole and dipole sources. This equation can be used to calculate individual components of the received vector field by altering the source type used in the propagation calculation. This enables a propagation model to calculate the received vector field components for an arbitrary number of source locations with a single model run for each received field component instead of requiring one model run for each source location. Application of the vector-scalar reciprocity principle is demonstrated with analytic solutions for a range-independent environment and with numerical solutions for a range-independent and a range-dependent environment using a parabolic equation model.
Electronics Engineer, Naval Undersea Warfare Center
Ozgenel, Caglar Firat. "Developing A Tool For Acoustical Performance Evaluation Throughout The Design". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614066/index.pdf.
Pełny tekst źródłaHAND, SCOTT ANTHONY. "ADAPTABLE ACOUSTICS IN MULTI-USE MUSIC PERFORMANCE SPACES". University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1083634977.
Pełny tekst źródłaZagala, Franck. "Simplified Acoustic Simulations and Virtual Acoustics : Contributions to Virtual Navigation for the Visually Impaired". Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS254.
Pełny tekst źródłaThis thesis takes place within the RASPUTIN project and focuses on the development, evaluation and use of immersive acoustic virtual reality simulation tools for the purpose of helping blind individuals prepare in-situ navigations in unfamiliar reverberant environments. While several assistive tools, such as sensory substitution devices, can provide spatial information during navigation, an alternative approach is to devise a real-time room acoustic simulation and auralization engine for use by blind individuals at home to enable them to virtually navigate in unfamiliar environments under controlled circumstances, hence building mental representations of these spaces prior to in-situ navigation. In this thesis, I tackle three aspects of this subject. The first part focuses on efficient simulations and auralizations of coupled volumes, which occur in many buildings of interest for navigation preparation (e.g. city halls, hospitals, or museums) and whose simulation and auralization can be challenging. The second part focuses on the individualization of head related transfer functions, which is a necessary step in providing individualized and convincing auditory experiences. Finally, the last part investigates some aspects of the space cognition following use of different learning paradigms, such as tactile maps
Barsanti, Robert J. "Denoising of ocean acoustic signals using wavelet-based techniques". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA329379.
Pełny tekst źródłaThesis advisor(s): Monique P. Fargues and Ralph Hippenstiel. "December 1996." Includes bibliographical references (p. 99-101). Also available online.
Abrahamson, Scott. "Automated psycho-acoustic experimental station". Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/19566.
Pełny tekst źródłaFountoulakis, Radamanthis P. "Oceanographic and acoustical survey of the East Ionian Sea". Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA241360.
Pełny tekst źródłaThesis Advisor(s): Bourke, Robert H. ; Coppens, Alan B. "September 1990." Description based on title screen as viewed on December 30, 2009. DTIC Identifiers: Raymode model, PE model. Author(s) subject terms: Oceanographic, acoustic survey, East Ionian Sea, PEmodel. Includes bibliographical references (p. 86-88). Also available in print.
Goates, Caleb Burley. "Analytical Expressions for Acoustic Radiation Modes of Simple Curved Structures". BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7494.
Pełny tekst źródłaWan, Lin. "Matched field processing based geo-acoustic inversion in shallow water". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37266.
Pełny tekst źródłaRecalde, Salas Angela Paola. "Variability in Baleen Whale Acoustical Ecology: Implications for Optimal Monitoring Using Passive Acoustics". Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/80627.
Pełny tekst źródłaHolm, Sebastian, i Petra Lagerberg. "En effektiv lektion : En interventionsstudie kring akustikåtgärder och taluppfattbarhet hos en femteklass". Thesis, KTH, Byggvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174028.
Pełny tekst źródłaThis is an interventional study of how classroom acoustics affects a class in regards to time effectiveness and speech intelligibility. The study compares results of measurements and tests before and after acoustical treatments in the form of a new acoustic ceiling. The treatments are made in a classroom in S:t Hansskolan elementary school, with the aim to see whether an improvement in room acoustics can lead to socio economic gains through an increase in the effective time for a lesson. The combined measurements and tests show the state of the acoustical environment before and after the treatments. Measurements includes the time it takes to get a lesson going, as well as various acoustical measurements and tests regarding speech intelligibility. Results shows that the room acoustics have improved with reduced reverberation times, an increase in early reflexes compared to late, as well as improved speech transmission index values. The class also scores higher on hearing in noise tests, which implies an increase in speech intelligibility. The teacher’s timekeeping shows that the time it takes to start classes has shortened by at least 15 minutes per week. On a whole the study shows that the acoustic treatments has led to an increase in use of planned time for each lesson, which through increased speech intelligibility also has become more effective. Observed socio economic effects outweigh the cost of the installation to the point that it is recommended not only to new classrooms but also to existing school environments.
Tam, Joseph. "Methods of Characterizing Gas-Metal Arc Welding Acoustics for Process Automation". Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/859.
Pełny tekst źródłaOne such feedback parameter in gas-metal arc welding (GMAW) is acoustic emissions. Although there have been relatively few studies performed in this area, it is agreed amongst professional welders that the sound from an arc is critical to their ability to control the process. Investigations that have been performed however, have been met with mixed success due to extraneous background noises or inadequate evaluation of the signal spectral content. However, if it were possible to identify the salient or characterizing aspects of the signal, these drawbacks may be overcome.
The goal of this thesis is to develop methods which characterize the arc-acoustic signal such that a relationship can be drawn between welding parameters and acoustic spectral characteristics. Three methods were attempted including: Taguchi experiments to reveal trends between weld process parameters and the acoustic signal; psycho-acoustic experiments that investigate expert welder reliance on arc-sounds, and implementation of an artificial neural network (ANN) for mapping arc-acoustic spectral characteristics to process parameters.
Together, these investigations revealed strong correlation between welding voltage and arc-acoustics. The psycho-acoustic experiments confirm the suspicion of welder reliance on arc-acoustics as well as potential spectral candidates necessary to spray-transfer control during GMA welding. ANN performance shows promise in the approach and confirmation of the ANN?s ability to learn. Further experimentation and data gathering to enrich the learning data-base will be necessary to apply artificial intelligence such as artificial neural networks to such a stochastic and non-linear relationship between arc-sound and GMA parameters.
Kalscheuer, Jon M. "A selective automatic repeat request protocol for undersea acoustic links". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FKalscheuer.pdf.
Pełny tekst źródłaKuster, Martin. "Inverse methods in room acoustics with under-determined data and applications to virtual acoustics". Thesis, Queen's University Belfast, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486233.
Pełny tekst źródłaLee, Iljae. "Acoustic characteristics of perforated dissipative and hybrid silencers". Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1117631229.
Pełny tekst źródłaTitle from first page of PDF file. Document formatted into pages; contains xvi, 195 p.; also includes graphics. Includes bibliographical references (p. 183-195). Available online via OhioLINK's ETD Center
Jackson, Edward James. "Modelling and monitoring nonlinear acoustic phenomena in high-intensity focused ultrasound therapy". Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:cea762cf-8a12-4265-b1b1-a15214c58ac3.
Pełny tekst źródłaPearson, Charlie. "Vertical axis wind turbine acoustics". Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245256.
Pełny tekst źródłaPrentice, Philip Ridley. "Asymptotic waveforms in propeller acoustics". Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282923.
Pełny tekst źródłaMaier, Christian. "Experimental and theoretical aero-acoustics". Thesis, Glasgow Caledonian University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601630.
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