Teses / dissertações sobre o tema "Vehicle acoustic"
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Vejendla, Balaji. "Acoustic source strength determination of turbocharger in an unfavourable acoustic environment". Thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265645.
Texto completo da fonteSyftet med M.Sc-avhandlingen är att specificera en mätmetod som är lämplig för att bestämma ljudeffektnivåerna och särskilt att kvantifiera nivåerna vid kompressorbladets passfrekvens för en turboladdare i den nya turbo-prestandariggen vid Scania CV AB, Södertälje .Intensitets- och tryckbaserade mätmetoder används ofta för att bestämma ljudeffektnivåerna. Avhandlingsarbetet fokuserar på tryckbaserade metoder eftersom intensitetsmät-ningar har en begränsning i höga frekvenser och intensitetsskanningen i riggen inte är tillåten när testriggen används. Till skillnad från de intensitetsbaserade metoderna är den största nackdelen med att använda de tryckbaserade metoderna påverkan från testmiljön på ljudtrycksmätningarna. Detta eftersom rummet inte är ekofritt och reflektioner från olika objekt i rummet kan leda till fel uppskattning av ljudeffektnivåerna. För att förstå testmiljöns inverkan vid de fyra valda mikrofonpositionerna utfördes flera mätningar både i överensstämmelse med internationella standarder och för att testa antaganden om rummets akustikegenskaper. Utöver själva turboladdaren innehåller testmiljön också tre hjälputrustningar; en kylfläkt, en brännare och ett oljekonditioneringssystem som kan bidra till bakgrundsljud i mikrofon-positionerna. En detaljerad studie har genomförts för att förstå påverkan från dessa ytterligare ljudkällor under mätningarna. Det konstaterades att bakgrundsljudet inte påverkar de uppmätta resultaten i frekvensområdet av intresse. Åtgärder vidtogs för att isolera strålning från anslutande rör genom att skydda dem med ljudabsorberande material. Baserat på resultaten från testmiljömätningarna och bakgrundsljudanalysen rekommenderas den internationella standarden ISO 3744 (Bestämning av ljudeffektnivåer i ett väsentligen fritt fält över ett reflekterande plan) för att bestämma ljudeffektnivåerna för turboladdaren. För en konstant axelhastighet konstaterades att de högsta ljudeffektnivåerna observerades när turboladdaren kördes nära pumplinjen, följt av området med högsta verkningsgrad och choke linjen i kompressor-mappen. De beräknade ljudeffektnivåerna har en begränsning eftersom turboladdare direktivitet är okänd på grund av det låga antalet mikrofoner i mikrofonarrangemang runt turboladdaren, men de erhållna resultaten är tillräckligt bra för att göra en jämförelse mellan olika turboladdare förutsatt att de har liknande direktivitet. Som framtida arbete rekommenderas en installation med ett större antal mikrofoner (säg c:a 10 stycken) som omger testobjektet vilket skulle hjälpa till att bestämma direktiviteten och därmed förbättra mätnoggrannheten. Vidare rekommenderas ytterligare studier om mikrofonpositionernas känslighet, arrangemanget av hjälputrustningen i rummet samt påverkan av ljudutstrålning från de anslutande rören mer lika de i den riktiga motorinstallationen.
Elwali, Wael. "Vehicle Vibro-Acoustic Response Computation and Control". University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382373197.
Texto completo da fonteFulton, Thomas F. (Thomas Friedrich) 1970. "Acoustic navigation for the autonomous underwater vehicle REMUS". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/88342.
Texto completo da fonteGutiérrez, Carlos 1974. "Unidirectional active acoustic control for launch vehicle fairings". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/89259.
Texto completo da fonteSampan, Somkiat. "Neural Fuzzy Techniques in Vehicle Acoustic Signal Classification". Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30612.
Texto completo da fontePh. D.
Cameron, Christopher John. "Design of Multifunctional Body Panels in Automotive Applications : Reducing the Ecological and Economical footprint of the vehicle industry". Licentiate thesis, Stockholm : Skolan för teknikvetenskap, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10661.
Texto completo da fonteLiu, Li. "Ground vehicle acoustic signal processing based on biological hearing models". College Park, Md. : University of Maryland, 1999. http://techreports.isr.umd.edu/reports/1999/MS%5F99-6.pdf.
Texto completo da fonteThesis research directed by Institute for Systems Research. "M.S. 99-6." Includes bibliographical references (leaves 75-78). Available also online as a PDF file via the World Wide Web.
Evans, Naoko. "Automated vehicle detection and classification using acoustic and seismic signals". Thesis, University of York, 2010. http://etheses.whiterose.ac.uk/1151/.
Texto completo da fonteOpinto, Alessandro <1991>. "Active Control of the Acoustic Field in a Vehicle Cabin". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10245/1/PhD_Thesis_AOpinto.pdf.
Texto completo da fonteRallabhandi, Sriram Kishore. "Sonic Boom Minimization through Vehicle Shape Optimization and Probabilistic Acoustic Propagation". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6937.
Texto completo da fonteWennhage, Per. "Structural-Acoustic Optimization of Sandwich Panels". Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3161.
Texto completo da fonteMasmitjà, i. Rusinyol Ivan. "Acoustic underwater target tracking methods using autonomous vehicles". Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/668828.
Texto completo da fonteLa biologia marina junt amb la importància que ha adquirit el sector pesquer, fa que es requereixin noves eines per a l’estudi dels nostres oceans. La capacitat de mesurar diferents poblacions i paràmetres ambientals d’espècies marines permet millorar el coneixement de l’impacte que l’ésser humà té sobre elles, millorant-ne els mètodes d’explotació. Per exemple, la capacitat de desplaçament i els patrons de moviment són crucials per obtenir el coneixement necessari per a una explotació sostenible de les pescaries involucrades. No obstant, la localització submarina és un dels principals problemes que s’ha de resoldre en l’explotació dels recursos submarins, on el sistema de posició global (GPS) no es pot utilitzar. A part dels mètodes tradicionals de posicionament submarí, com per exemple el Long Base-Line (LBL) o el Ultra-Short Base-Line (USBL), nous mètodes han estat desenvolupats per tal de millorar la navegació, la flexibilitat, i per reduir els costos de desplegament. Per exemple, el Range-Only and Single-Beacon (ROSB) utilitza un vehicle autònom per a localitzar i seguir diferents objectius submarins mitjançant mesures de rang realitzades a partir de mòdems acústics. En un escenari on l’objectiu a seguir és mòbil, el mètode ROSB de seguiment pot ser vist com a un problema de Hidden Markov Model (HMM). Aleshores, utilitzant la regla de Bayes, la funció de distribució de probabilitat dels estats del HMM pot ser solucionat utilitzant diferents mètodes de filtratge. Per tant, s’estudien diferents estratègies per millorar el sistema de localització i seguiment basat en ROSB, tant per objectius estàtics com mòbils. En aquesta tesis, presentem i comparem diferents mètodes utilitzant diferents escenaris, els quals s’han avaluat tant en simulacions com en proves de camp reals. A més, es presenten les principals notacions matemàtiques de cada algoritme i les millors pràctiques a utilitzar. Per tant, des d’un punt de vista metodològic, aquest treball fa un pas endavant en el coneixement de l’exactitud que es pot assolir utilitzant els mètodes de localització i seguiment d’espècies mitjançant algoritmes ROSB i vehicles autònoms. A més a més, mentre molts dels treballs realitzant durant els últims anys es centren en l’ús de mòdems acústics per al seguiment d’objectius submarins, en aquesta tesis es presenta un innovador mètode anomenat Area-Only Target Tracking (AOTT). Aquest sistema utilitza petites etiquetes acústiques comercials (tag), la qual cosa, redueix el cost i la complexitat en comparació amb els altres mètodes. Addicionalment, gràcies a l’ús d’aquests tags de dimensions reduïdes, aquest sistema permet seguir espècies marines com les meduses. La metodologia utilitzada per el mètode AOTT es mostra en aquesta tesis, on també es presenten els primers experiments realitzats a la badia de Monterey a Califòrnia.
BAKKAL, Ahmet Tansu. "Acoustic Detection of Rear Approaching Vehicles for Cyclists". Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25182.
Texto completo da fonteBeach, Joseph N. "Integration of an Acoustic Modem onto a Wave Glider Unmanned Surface Vehicle". Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/7308.
Texto completo da fonteKreamer, William Ryan 1976. "Supervisory control of an autonomous underwater vehicle using an acoustic communication link". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8969.
Texto completo da fonteIncludes bibliographical references (leaves 84-86).
In this thesis, I designed and tested a supervisory control scheme for the Odyssey II-class Autonomous Underwater Vehicles that relies on a very-low-data-rate acoustic communication link. A human supervisor communicates with the AUV over a combination radio/acoustic network. The supervisor radios commands from shore to data repeater nodes moored at strategic locations on the ocean surface. Utility Acoustic Modems mounted on the moorings rebroadcast the binary data into the sea in the 12-17 kHz frequency band. The moving AUV detects the transmission, decodes the message, and carries out the command contained within. The operator's commands are implemented in the context of a behavior-based layered control software architecture. The supervisory control scheme was tested and verified during the Synaptic Internal Tide Experiment, which took place in Monterey Bay during August and September, 1999.
by William Ryan Kreamer.
S.M.
Van, der Kelen Christophe. "Characterisation of anisotropic acoustic properties of porous materials - inverse estimation of static flow resistivity". Licentiate thesis, KTH, MWL Strukturakustik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31183.
Texto completo da fonteQC 20110311
Aghaei, Shayan. "Acoustic Radiation Of An Automotive Component Using Multi-Body Dynamics". Thesis, KTH, Fordonsdynamik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-288710.
Texto completo da fonteEn viktig aspekt i att skapa fordon av hög kvalitet är att skapa komponenter som är tysta och smidiga under drift. I verkligheten är det dock svårt att mäta ljudet som vissa fordonskompo- nenter ger under belastning eftersom det kräver specialanläggningar och utrustning, vilket är dyrt att skaffa. Dessutom maskerar motorerna som används i testbäddar ut bullret från mycket tystare komponenter, till exempel en kraftöverföringsenhet (PTU). Detta examensar- bete syftar till att lösa dessa problem genom att beskriva de steg som krävs för att virtuellt uppskatta den akustiska strålningen av en PTU med hjälp av transmissionsfelet (TE) som ingångsexcitation via flerkroppsdynamik (multi-body dynamics, MBD). MBD används för att uppskatta kåpans vibrationer, som sedan kan kopplas till ett akustiskt verktyg för att skapa en ljudutstrålningsanalys. Således skapas en genomförbar metod för att mäta den akustiska pre- standan utan att medföra betydande kostnader. Dessutom möjliggör det att lättare integrera ljud- och vibrationsanalyser i designfasen. Detta examensarbete analyserade ljudet som utstrålats på grund av kugghjulsljud, som uppstår på grund av TE och uppträder vid kuggingreppsfrekvensen och dess multiplar. Simuleringarna belyste att TE kan förutsägas exakt med de metoder som beskrivs i detta examensarbete. På samma sätt kan metoden på ett tillförlitligt sätt uppnå kåpans vibrationer. Resultaten från denna analys visar att vid 2000 rpm var PTU känslig för vibrationer vid 500, 1000 och 1500 Hz, den största amplituden var vid 1000 Hz. Dessutom var ljudeffektsnivån (SWL) proportionell mot vibrationsamplituderna i systemet. Analytiska beräkningar genomfördes för att verifiera metoderna och visade en stark korrelation. Dock drogs slutsatsen att experiment krävs för att ytterligare verifiera resultaten i detta arbete.
Scrivener, Arthur W. "Acoustic underwater navigation of the Phoenix Autonomous Underwater Vehicle using the DiveTracker system". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA307914.
Texto completo da fonteTorsiello, Kevin A. "Acoustic positioning of the NPS Autonomous Underwater Vehicle (AUV II) during hover conditions". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA279934.
Texto completo da fonteThesis advisor(s): Healey, Anthony J. "March 1994." DTIC Descriptors: Underwater Vehicles, Acoustics, Control, Yaw, Environments, Dynamics, Motion, Motors, Sonar, Transponders, Directional, Nets, Hovering, Bottom, Thrusters, Mine Hunting, Theses, Tunnels, Internal, Stationary, Missions. DTIC Indicators: Autonomous Underwater Vehicles. Authors subject terms: Autonomous Underwater Vehicle, Acoustic Dynaminc Positioning, Marine Vehicle Dynamics, Proportional Derivative Control. Bibliography: p. 116. Also available online.
Lindberg, Eskil. "A Vibro-Acoustic Study of Vehicle Suspension Systems : Experimental and Mathematical Component Approaches". Doctoral thesis, KTH, MWL Strukturakustik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-121575.
Texto completo da fonteQC 20130503
Cameron, Christopher John. "Design of Multifunctional Body Panels for Conflicting Structural and Acoustic Requirements in Automotive Applications". Doctoral thesis, KTH, Lättkonstruktioner, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31112.
Texto completo da fonteQC 20110311
Basu, Somayan. "Acoustic Source Characterization of a Road". Thesis, KTH, Skolan för teknikvetenskap (SCI), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290036.
Texto completo da fonteEn väg kan betraktas som en bullerkälla baserat på dess trafikintensitet. Intuitivt bör en väg med hög trafikintensitet klassificeras som en linjekälla och för få fordon en samling punktkällor. Denna studie handlar om klassificeringen av en motorvägssträcka till antingen en linjekälla eller en samling punktkällor baserat på ljudtrycket uppmätt med sju mikrofoner placerade på varierande avstånd från motorvägen. Resultaten visar att källklassificeringen är beroende av trafiktätheten och av avståndet till vägen.
Lind, Nordgren Eleonora. "A study of tailoring acoustic porous material properties when designing lightweight multilayered vehicle panels". Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100701.
Texto completo da fonteQC 20120815
Nordgren, Eleonora. "A study of tailoring acoustic porous material properties when designing lightweight multilayered vehicle panels". Phd thesis, Conservatoire national des arts et metiers - CNAM, 2012. http://tel.archives-ouvertes.fr/tel-00780756.
Texto completo da fonteEvans, Benjamin Kerbin. "The effect of coded signals on the precision of autonomous underwater vehicle acoustic navigation". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/29044.
Texto completo da fonteIncludes bibliographical references (p. 127-128).
Acoustic coded signaling offers potentially significant improvements over traditional "toneburst" methods in many underwater applications where error due to noise and multipath interference is a problem. In this thesis, the use of these spread spectrum techniques is analyzed for navigation of the REMUS autonomous underwater vehicle. The accuracy of the current system using Turyn and Barker sequences, as well as toneburst, is quantified, and the sources of the remaining error are examined.
by Benjamin Kerbin Evans.
Ocean E.
Bouilloux-Lafont, Antoine, e Pozo Rubén Noya. "Development of Acoustic Simulations using Parametric CAD Models in COMSOL". Thesis, Linköpings universitet, Maskinkonstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157612.
Texto completo da fonteFischell, Erin Marie. "Characterization of underwater target geometry from autonomous underwater vehicle sampling of bistatic acoustic scattered fields". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100161.
Texto completo da fonteCataloged from PDF version of thesis.
Includes bibliographical references (pages 153-156).
One of the long term goals of Autonomous Underwater Vehicle (AUV) minehunting is to have multiple inexpensive AUVs in a harbor autonomously classify hazards. Existing acoustic methods for target classification using AUV-based sensing, such as sidescan and synthetic aperture sonar, require an expensive payload on each outfitted vehicle and expert image interpretation. This thesis proposes a vehicle payload and machine learning classification methodology using bistatic angle dependence of target scattering amplitudes between a fixed acoustic source and target for lower cost-per-vehicle sensing and onboard, fully autonomous classification. The contributions of this thesis include the collection of novel high-quality bistatic data sets around spherical and cylindrical targets in situ during the BayEx'14 and Massachusetts Bay 2014 scattering experiments and the development of a machine learning methodology for classifying target shape and estimating orientation using bistatic amplitude data collected by an AUV. To achieve the high quality, densely sampled 3D bistatic scattering data required by this research, vehicle broadside sampling behaviors and an acoustic payload with precision timed data acquisition were developed. Classification was successfully demonstrated for spherical versus cylindrical targets using bistatic scattered field data collected by the AUV Unicorn as a part of the BayEx'14 scattering experiment and compared to simulated scattering models. The same machine learning methodology was applied to the estimation of orientation of aspect-dependent targets, and was demonstrated by training a model on data from simulation then successfully estimating the orientations of a steel pipe in the Massachusetts Bay 2014 experiment. The final models produced from real and simulated data sets were used for classification and parameter estimation of simulated targets in real time in the LAMSS MOOS-IvP simulation environment.
by Erin Marie Fischell.
Ph. D.
Jonsson, Jonas. "Microsystems Technology for Underwater Vehicle Applications". Doctoral thesis, Uppsala universitet, Ångström Space Technology Centre (ÅSTC), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-171742.
Texto completo da fonteDeeper Access, Deeper Understanding (DADU)
Fuller, Ryan Michael. "Adaptive Noise Reduction Techniques for Airborne Acoustic Sensors". Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1355361066.
Texto completo da fonteMorrison, Archie Todd. "System identification and state reconstruction for autonomous navigation of an underwater vehicle in an acoustic net". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/37999.
Texto completo da fonteGRSN 683373
Includes bibliographical references (leaves 202-205).
by Archie Todd Morrison, III
Ocean.E.
Mahmud, Sakib. "Comparing the Performance of Bottom-Moored and Unmanned Surface Vehicle Towed Passive Acoustic Monitoring Platforms for Marine Mammal Detections". Thesis, University of Louisiana at Lafayette, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10636502.
Texto completo da fontePassive acoustic monitoring (PAM) is a more effective method of monitoring cetaceans’ distribution and abundance than conventional visual surveys. Cetaceans are highly vocally active and produce identifiable acoustic signals during echolocation and communication. Three different PAM platforms recorded data in overlapping time periods in the vicinity of the 2010 Deepwater Horizon oil spill site: bottom-moored buoys (EARS), Unmanned Surface Vehicle towed arrays (USV), and subsurface glider-mounted hydrophones. Detection rates of the EARS and USV were compared to investigate their efficiency in detecting marine mammals. Detection events were obtained using independent detectors for each platform and then compared by feeding data through a common detector. Results from both detectors and platforms were compared, and a comparable trend of detection rates was found. The purpose of this study is to aid in the development of cost-efficient PAM methodology for mitigation and environmental impact assessment purposes.
Lindberg, Eskil. "Vehicle Disc Brake Roughness Noise : Experimental Study of the Interior Noise andVibro-Acoustic Modelling of Suspension Systems". Licentiate thesis, KTH, MWL Strukturakustik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-39554.
Texto completo da fonteQC 20110913
Yapanel, Umit. "Acoustic modeling and speaker normalization strategies with application to robust in-vehicle speech recognition and dialect classification". Diss., Connect to online resource, 2005. http://wwwlib.umi.com/cr/colorado/fullcit?p3190395.
Texto completo da fonteParra, Martinez Juan Pablo. "On the ECO2 multifunctional design paradigm and tools for acoustic tailoring". Licentiate thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-161209.
Texto completo da fonteQC 20150323
Lundblad, Ohan. "The prospects of using acoustic particle separation techniques to separate heavy metals from lake- and seabed sediments". Thesis, KTH, Marcus Wallenberg Laboratoriet MWL, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299414.
Texto completo da fonteDetta arbete söker svar på om det är realistiskt att använda akustiska metoder för att i stor skala sortera ut tungmetaller från pump-muddrat sjöbottensediment. Utgångspunkten har varit att materialet ska genomgå hydrotermisk karbonisering (HTC) innan akustisk behandling. Ett antal vetenskapliga rapporter har studerats för att kunna förstå var forskningsfronten är, gällande att manipulera små partiklar i vätska med hjälp av högfrekvent ljud (ultraljud). Diskussion har hållits med experter på ultraljud, HTC och kemisk analys. Avslutningsvis har möjligheten att avlägsna tungmetaller ifrån HTC-behandlat material med hjälp av ultraljud evaluerats, baserat på teoretiska möjligheter, jämförelser med ett urval av liknande studier, och begränsade mätningar av egenskaper hos materialet. Förutsättningarna för praktiska experiment, som skulle kunna bevisa eller motbevisa denna möjlighet, har utforskats. Möjligheten att skala upp processen har diskuterats.
Grialou, Matthieu. "Vibro-acoustics substructuring : Combining simulations and experimental identification of subdomains for low frequency vehicle acoustics". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI109/document.
Texto completo da fonteExhaust noise has a significant impact on acoustic comfort and the sound identity of a vehicle brand. The present study focuses on the: “Description and quantification of the sound transmission from the exhaust outlet into the interior of a vehicle”. Physically the noise propagation from the exhaust pipe to the cabin consists of three steps: The sound waves propagate through the air from the exhaust outlet to the external skin of the vehicle (1); the external skin vibrates and transmits its vibration to the internal skin (2); the internal skin radiates sound in the passengers’ cabin (3). The Patch Transfer Functions method, which is based on the framework of dynamic substructuring, allows for the consideration of this complex problem as simpler subproblems that consist of subsystem interactions. Yet the application of the method to a full vehicle requires addressing the problem: “Characterization of Patch Transfer Functions of a subsystem by means of measurement on a coupled system”. This dissertation presents an original inverse method for the measurement of Patch Transfer Functions. In industrial structures, this in-situ characterization is generally the only possible measurement method. Yet, due to the ill posed nature of the problem, the inversion process is difficult. An original regularization method is proposed. The method is tested through numerical simulations, and is validated with an experimental setup
Hwang, Isabel. "An initial study on external warning signals for Quiet Road Transport Vehicles". Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Produktutveckling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-31111.
Texto completo da fonteWang, Yawen. "Vibration and Sound Radiation Analysis of Vehicle Powertrain Systems with Right-Angle Geared Drive". University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491318542819425.
Texto completo da fonteHaven, Scott. "Measuring surface ocean wave height and directional spectra using an Acoustic Doppler Current Profiler from an autonomous underwater vehicle". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78181.
Texto completo da fonteCataloged from PDF version of thesis.
Includes bibliographical references (p. 117-119).
The Acoustic Doppler Current Profiler (ADCP) is a proven technology which is capable of measuring surface wave height and directional information, however it is generally limited to rigid, bottom mounted applications which limit its capabilities for measuring deep water waves. By employing an upward looking ADCP on a moving platform, such as an autonomous underwater vehicle or submerged float, we show that it is possible to remove the wave induced motion of the platform and accurately measure surface ocean wave information. The platform selected for testing was a REMUS-100 vehicle equipped with an upward and downward looking ADCP and high accuracy Kearfott inertial navigation unit. Additionally, a Microstrain 3DM-GX3-25 Attitude Heading Reference System was tested as a low cost alternative to the Kearfott system. An experiment consisting of multiple REMUS deployments was conducted near the Martha's Vineyard Coastal Observatory (MVCO). The wave induced motion was measured by various inertial and acoustic sensors and removed from the ADCP data record. The surface wave height and mean directional estimates were compared against a Datawell MKIII directional Waverider buoy and bottom mounted 1200 kHz upward looking ADCP at the MVCO. Results demonstrate that the non-directional spectrum of wave height and the mean wave direction as a function of frequency can be accurately measured from an underway autonomous underwater vehicle in coastal depth waters using an ADCP.
by Scott Haven.
S.M.
Cellier, Antony Hermann Guy. "Detection and Identification of Instability and Blow-off/Flashback Precursors in Aeronautical Engines using Deep Learning techniques". Thesis, KTH, Kraft- och värmeteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-272079.
Texto completo da fonteUtvecklingen av injektionsprocesser mot mer bränsleeffektiva och mindre förorenande förbränningssystem, tenderar att göra dem mer benägna att utsättas för kritiska händelser som Thermo-Acoustic Instabilities, Blow-Off och Flash-Back. Dessutom diskuterar flygmotorkonstruktörer möjligheten att använda Dihydrogen som sekundärt eller som huvudbränsle. Det modifierar drastiskt systemets stabilitet och det väcker frågan hur man kan använda det effektivt. Att kunna förutsäga kritiska fenomen blir en nödvändighet för att använda ett system utan att behöva att på förhand testa varje konfiguration och utan att reducera användarens säkerhet. Baserat på Deep-Learning-tekniker och Speech-Recognition-tekniker, presenterar följande studie stegen för att utveckla ett verktyg som kan upptäcka och översätta föregångare till instabilitet hos en swirled flygmotorerinsprutningspump som är innesluten i en förbränningskammare. De lovande resultaten leder till idéer om hur man kan anpassa det här verktyg till ett system i verklig storlek.
Muzi, Lanfranco. "Advances in Autonomous-Underwater-Vehicle Based Passive Bottom-Loss Estimation by Processing of Marine Ambient Noise". PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2612.
Texto completo da fontePegoretti, Thaís dos Santos 1986. "Environmental and sound analysis of the acoustic treatment of vehicle compartments = Análise ambiental e sonora do tratamento acústico de habitáculos de veículos". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265853.
Texto completo da fonteTese (doutorado) ¿ Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: Este trabalho tem como objetivo desenvolver uma metodologia capaz de adicionar critérios ambientais à fase de pré-projeto de um tratamento acústico veicular. Essa integração foi realizada através de uma otimização multiobjetivo baseada em um algoritmo genético. Um caso real foi analisado com a metodologia proposta. Ele consiste em um painel acústico multicamadas aplicado em um automóvel de passeio. O método da matriz de transferência é usado para o cálculo do comportamento acústico do painel. Neste método é feita a hipótese simplificadora de painel de área infinita, o que permite um custo computacional muito menor do que modelos de elementos finitos. Para a modelagem de materiais poroelásticos, utiliza-se o modelo de Johnson-Champoux-Allard, que inclui os fenômenos de dispersão de energia resultante da interação térmica e viscosa entre as fases sólida e fluida. O custo computacional menor do modelo é essencial para a otimização. Foram estabelecidos como objetivos da otimização a curva de perda de transmissão desejada e os resultados da análise do ciclo de vida do painel. Uma curva de perda de transmissão em função de bandas de oitava foi estabelecida como um critério de desempenho acústico mínimo. Para os critérios ambientais, o impacto de um painel existente foi estabelecido como máximo. A análise do ciclo de vida quantifica o impacto do produto em relação a diversos aspectos. Na metodologia proposta três critérios foram selecionados inicialmente: aquecimento global, destruição de recursos abióticos e toxicidade da água doce. Finalmente, apenas um deles foi utilizado na otimização, o aquecimento global, pois os critérios máximos estabelecidos para os demais eram facilmente atingidos ao longo da otimização. A otimização multiobjetivos gera como resultado uma frente de Pareto com um conjunto de soluções, e cabe ao projetista escolher a melhor opção, analisando-a em relação ao impacto ambiental e a outros aspectos, tais como disponibilidade e custo
Abstract: This work aims at developing a methodology capable of adding environmental criteria to the pre-design of a vehicular acoustic treatment. This integration was accomplished through a multi-objective optimization based on a genetic algorithm. A real case study was analyzed with the proposed methodology. It consists of a multilayered acoustic panel applied in passenger vehicles. The transfer matrix method is used to calculate the acoustic behavior of the panel. In this method the panel area is infinite. It provides a lower computational cost than finite element models, which can take into account the real dimensions of the panel. The Johnson-Champoux-Allard model was used for poroelastic material modeling. It includes the energy loss generated by the viscous and the thermal interactions between the solid and the fluid media. The lower computational cost of the model is essential for the optimization. The desired acoustic transmission and results of the life cycle analysis of the panel were established as the optimization objectives. A transmission loss curve in octave bands was defined as a minimum noise performance criterion. For the environmental criteria, an existing panel behavior was established as the maximum. The life cycle assessment quantifies the product impact with respect to many aspects. In the proposed methodology, three criteria were initially selected: global warming, abiotic depletion, and fresh water aquatic ecotoxicity. Finally, only one of them was used in the optimization, the global warming, because the maximum values established for the other criteria were easily achieved during the optimization. The multi-objective optimization provides a Pareto front solutions set, and it is up to the designer to choose the best option, analyzing the solution set with relation to environmental impact and other aspects, such as availability and cost
Doutorado
Mecanica dos Sólidos e Projeto Mecanico
Doutora em Engenharia Mecânica
Mak, Lin Chi Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "Non-Line-of-Sight localisation of a sound source". Awarded by:University of New South Wales. Mechanical & Manufacturing Engineering, 2009. http://handle.unsw.edu.au/1959.4/44702.
Texto completo da fonteEdwards, Matthew Ryan. "Development of an automotive steering-wheel mounted audio user Interface". Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53529.
Texto completo da fonteBagley, Phil. "Investigations of the behaviour of demersal grenadier fish, Coryphaenoides (Nematonurus) armatus in the abyssal Pacific and Atlantic oceans using an autonomous acoustic tracking vehicle". Thesis, University of Aberdeen, 1993. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU049186.
Texto completo da fonteHolmberg, Andreas. "Experimental Determination of Aeracoustic Sources in Low Mach Number Internal Flows". Licentiate thesis, KTH, MWL Strömningsakustik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26133.
Texto completo da fonteQC 20101118
Experimental characterization of aero-acoustic sources
Cousson, Rémi. "Identification de sources acoustiques au passage d'un véhicule routier par imagerie acoustique parcimonieuse dans le domaine temporel". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI106/document.
Texto completo da fonteThe study detailed in this manuscript is part of the effort to characterize the noise emission from road vehicles. We wish to identify the noise sources of a moving vehicle, when driven on a roadway in real-world conditions, with roadside acoustic measurements. The current acoustic imaging methods do not provide sufficient performance on road vehicles. A state of the art led to the selection of an existing method, MSA-PSF, which consists in deconvolving signals from mobile sources in the frequency domain under certain assumptions, and was originally developed for aeroacoustics. This method is adapted here to the context of road vehicles. Then, an original approach is proposed in order to tackle the specific constraints of this context: CLEANT. This is an iterative method, performed in time domain with a wideband approach, which takes into account the effect of sources motion and includes two parameters designed to refine the result: the loop factor and the stopping criterium. A further version of the algorithm, including a frequency filter, is also proposed and shows significant improvement in identifying secondary sources in some particular cases. An interesting point of CLEANT is the availability of the sources reconstructed time signals, which enables other types of analysis, especially the use of the coherence with signals from on-board measurements in order to separate the contributions of uncorrelated sources. MSA-PSF and CLEANT are evaluated with numerical simulations and a set of indicators to measure their source localization and quantification performance. They are then tested in a controlled laboratory conditions experiment, using a moving source. This experiment represents a first application of the methods to a practical case, involving a linear motion, two simultaneous sources and different kinds of signals (tone and wideband). They are finally compared to the classical approach of moving source beamforming, within the frame of an experiment on a road vehicle, in real-world conditions. The original approach CLEANT yields very encouraging results, and is a clear improvement from the conventional beamforming, especially at low frequency for the tested cases. Applying it to a road vehicle in real-world conditions highlights a potentially troublesome behavior of the method, and the solution brought by CLEANT's frequency filtered version, or by adapting its various parameters. The coherence with reference signals to discriminate the physical origins of the sources is also tested and underlines the role of the short duration of the signals related to the sources passing-by context
Cai, Rui [Verfasser]. "Methode zur objektivierten Komfortbeurteilung antriebsstranginduzierter Fahrzeugschwingungen am Fahrzeug-Rollenprüfstand = Method for evaluating the subjective perception of powertrain induced vehicle vibration using objective characteristic parameters on the acoustic roller test bench / Rui Cai". Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1225401135/34.
Texto completo da fonteБукар, Григорій Миколайович. "Акустична система виявлення і локалізації малих літальних апаратів". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/34775.
Texto completo da fonteThesis contains the bulk of the 30 pages, 17 illustrations and 1 table. The aim of the work is to develop an acoustic guidance system for unmanned aerial vehicles. The analytical review of the literature is carried out, the acoustic characteristics of radiation are established, the triangulation method of localization of unmanned aerial vehicles is chosen. It is proposed to use the correlation method to determine the bearings. Computer simulation of the correlation direction finder made it possible to determine the signal-to-noise ratio to ensure reliable detection.
Marr, William J. "Acoustic based tactical control of underwater vehicles". Diss., Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FMarr%5FPhD.pdf.
Texto completo da fonteDissertation supervisor: Anthony J. Healey. Includes bibliographical references (p. 169-173). Also available online.