Log in

Relevant bibliographies by topics / Vibrations-Acoustics

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Vibrations-Acoustics'

Author: Grafiati

Published: 6 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Vibrations-Acoustics.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Vibrations-Acoustics"

1

Richardson, Bernard E. "Good vibrations (musical acoustics)." Physics Education 25, no. 1 (January 1, 1990): 35–40. http://dx.doi.org/10.1088/0031-9120/25/1/006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Festa, Maurizio, Frank Stalter, Arm Tavornmas, and Frank Gauterin. "Human Response to Vehicle Vibrations and Acoustics during Transient Road Excitations." Vibration 4, no. 2 (April 8, 2021): 357–68. http://dx.doi.org/10.3390/vibration4020023.

Full text

Abstract:

Driving over rising and falling edges on roads and pavements, rails, manhole covers, or transverse joints can influence the driving impression regarding the driver’s perception of vibrations and acoustics. To be able to describe this, objective parameters are used to make the subjective ride comfort measurable and scalable. Previous studies have already contributed to the investigation of the subjective perception regarding the interaction of vibrations and acoustics. However, the results were individual. Aimed at improving the quality of objective analysis methods, driving maneuvers were performed in a real vehicle to investigate the interaction of vibrations and acoustics due to transient road excitations. For this purpose, a sound reproduction system was used, which could provide the acoustic environment for the driver to adapt to while driving. With this method, subjective ratings by varying vibrations and acoustics were collected and with reference to objective parameters statistically evaluated. The results showed that both tactile and audible vibrations under transient influences had no significant interactive effects on the driver’s perception.

APA, Harvard, Vancouver, ISO, and other styles

3

Jasinski, Christopher M., and Robert D. Celmer. "Effective educational practices, assessment, and applications in acoustics and vibration at the University of Hartford." Journal of the Acoustical Society of America 152, no. 1 (July 2022): 633–39. http://dx.doi.org/10.1121/10.0012697.

Full text

Abstract:

The University of Hartford is home to two unique undergraduate engineering majors in acoustics, both sharing a core course layout of acoustics, vibrations, and projects. The Bachelor of Science in Mechanical Engineering with an Acoustics Concentration and the Bachelor of Science in Engineering in Acoustical Engineering and Music programs allow for two complementary tracks within the acoustics field, providing cohesive plans of study on many facets of listening and design. All Mechanical Engineering majors (regardless of concentration) are required to take Vibrations I and a course in Engineering and Environmental Acoustics. The department philosophy for this inclusion is that acoustics and vibration design considerations are an essential component for the development of the complete mechanical engineer. This paper outlines program educational goals and outcomes, along with pedagogical adjustments made based on continuous assessment and evaluation of select courses, including recent changes to adapt to measured deficiencies. The paper also details the historical development of the acoustics program, components of the Vibrations I and Engineering & Environmental Acoustics courses, and example research and design projects based on work in these courses. Among the included projects are modal analysis, community room acoustics assessment, and an open access computational room acoustics simulator for use and collaboration with colleagues in acoustics education.

APA, Harvard, Vancouver, ISO, and other styles

4

Newland, David E. "Harmonic wavelets in vibrations and acoustics." Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 357, no. 1760 (September 1999): 2607–25. http://dx.doi.org/10.1098/rsta.1999.0451.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Ginsberg, Jerry H. "Fifty five years following a long and winding road through structural acoustics and vibrations." Journal of the Acoustical Society of America 153, no. 3_supplement (March 1, 2023): A209. http://dx.doi.org/10.1121/10.0018678.

Full text

Abstract:

Being an academic at institutions that did not have a dedicated mission in acoustics allowed me to pursue diverse research topics. Probably because of the challenge presented by structural acoustics and vibrations, my efforts were primarily focused in those areas. They proceeded from nonlinear shell theory, to pipeline instability, to nonlinear vibrations, to nonlinear acoustics, to variational methods for acoustic radiation, to shock response of submarines, to experimental modal analysis, to coupled acoustic-structure resonance of a flying telescope with an open cavity. I will attempt to attempt to explain what led me to this progression, and to place these efforts in the context of communal efforts.

APA, Harvard, Vancouver, ISO, and other styles

6

Ginsberg, Jerry. "Hot topics in structural acoustics and vibrations." Journal of the Acoustical Society of America 88, S1 (November 1990): S69. http://dx.doi.org/10.1121/1.2029116.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Hambric, Stephen A. "Structural Acoustics Tutorial—Part 1: Vibrations in Structures." Acoustics Today 2, no. 4 (2006): 21. http://dx.doi.org/10.1121/1.2961142.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Kaster, Theo, Heinrich Kostyra, and Torsten Treyde. "Acoustics and vibrations on steering and braking systems." ATZ worldwide 107, no. 9 (September 2005): 12–14. http://dx.doi.org/10.1007/bf03224761.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Tournat, Vincent. "Graduate studies in acoustics and wave physics at Institut d’Acoustique - Graduate School, Le Mans, France." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A125. http://dx.doi.org/10.1121/10.0015766.

Full text

Abstract:

This poster presents the graduate studies in Acoustics at Le Mans (France) offered at the “Institut d’Acoustique - Graduate School”. Graduate studies in Acoustics at Le Mans University have been awarded in 2018 the excellence label “École Universitaire de Recherche” among 28 other reference centers for all fields of Science, through a highly selective national call. Our master and engineering school programs range from physical acoustics, environmental acoustics, acoustics and vibrations to international masters on electro-acoustics and on wave physics. The education through research is carried out at the LAUM, UMR CNRS, one of the largest acoustics laboratory in the world. Several details, objectives, student feedbacks and contact informations on the graduates studies will be given on the poster.

APA, Harvard, Vancouver, ISO, and other styles

10

Shariff, Yasir M. "Acoustics Vibrations to Enhance Flow Boiling in Micro Channels." International Journal of Thermal and Environmental Engineering 2, no. 1 (December 15, 2010): 19–25. http://dx.doi.org/10.5383/ijtee.02.01.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Vibrations-Acoustics"

1

Kumar, Ashok. "Active structural-acoustic control of interior noise in vibro-acoustic cavities." Thesis, IIT Delhi, 2016. http://localhost:8080/iit/handle/2074/7036.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Oliver, Douglas L. "Analysis of a Pseudo-Harmonic Tubular Bell." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo149980725594691.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Cuenca, Jacques. "VIBRATIONS DE FLEXION DE PLAQUES MINCES: APPROCHES ONDULATOIRES - Modèle des vibrations de plaques polygonales basé sur la méthode des sources image - Absorption passive de vibrations par l'effet de trou noir acoustique." Phd thesis, Université du Maine, 2009. http://tel.archives-ouvertes.fr/tel-00442260.

Full text

Abstract:

Les vibrations de flexion des structures minces sont étroitement liées au rayonnement sonore et à l'endommagement des structures. Ainsi, des méthodes de modélisation des vibrations et des techniques d'amortissement sont indispensables dans divers domaines scientifiques et techniques. La première partie de la thèse traite du développement d'un modèle des vibrations de flexion de plaques minces polygonales excitées ponctuellement, basé sur la méthode des sources image. Celle-ci consiste à représenter les réflexions successives sur les bords de la plaque par des sources virtuelles, obtenues par symétries successives de la source d'origine. Le modèle développé permet de prédire les vibrations d'une plaque et d'un assemblage de plaques dont la géométrie et les conditions aux limites sont arbitraires. La particularité de la méthode est que la précision des simulations s'améliore avec la fréquence et l'amortissement structural, ce qui est contraire à la méthode des éléments finis ou aux méthodes dites modales. Un outil de mesure du module d'Young et du facteur d'amortissement de panneaux fortement amortis est également proposé. La deuxième partie de la thèse traite de l'amortissement des vibrations par l'effet de ``trou noir acoustique''. La célérité des ondes de flexion dépend de l'épaisseur de la structure dans laquelle elles se propagent. Ainsi, une onde se propageant dans une plaque d'épaisseur décroissante ralentit et, dans certaines conditions, peut s'arrêter complètement. Le coefficient de réflexion d'une telle structure étant nul en théorie, le phénomène porte le nom de trou noir acoustique. Un modèle est développé, permettant d'estimer les valeurs optimales des paramètres des matériaux utilisés afin de maximiser l'amortissement. Les résultats numériques, ainsi que des études expérimentales, montrent une réduction de niveau vibratoire atteignant 20 décibels. Une configuration alternative est également explorée, consistant à contrôler la célérité des ondes en modifiant le module d'Young de la structure. Pour ce faire, une poutre en polymère à mémoire de forme est soumise à un gradient thermique. Enfin, l'utilisation d'un gradient thermique sur une poutre à épaisseur décroissante montre une atténuation considérable du champ vibratoire.

APA, Harvard, Vancouver, ISO, and other styles

4

Mullen, Michael P. "DATA ACQUISITION, ANALYSIS, AND MODELING OF ROTORDYNAMIC SYSTEMS." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2164.

Full text

Abstract:

Data acquisition systems for rotordynamic analysis and machine vibration were explored for the purpose of replacing the obsolete Bently Nevada ADRE 208 and ADRE for Windows system. These included the development of Matlab based custom data acquisition systems and a user interface. A model of an anisotropic rotor response undergoing transient speed was developed for the rapid prototyping and testing of data acquisition systems. Several methods for the measurement of amplitudes and phase in both the time domain and frequency domain were developed and compared. An alternate data acquisition method which is more inline with industry practices was created for the purpose of spectral analysis. Additionally, an optimized data acquisition strategy was developed for implementation within the Matlab app which included batch processing, state-based acquisition, and differentiated vector and waveform acquisition rates. A Bently Nevada 2300/20 vibration monitor was configured for use in the lab but found unsuitable for replacing the ADRE 208. Ultimately a Bently Nevada ADAPT 3701/44 Vibration Monitor was configured and found to be an adequate replacement for the ADRE 208 system for use in the Cal Poly Vibrations Lab.

APA, Harvard, Vancouver, ISO, and other styles

5

Forsberg, Alexander, and Aras Wali. "Vibration reduction over junctions in buildings." Thesis, KTH, Marcus Wallenberg Laboratoriet MWL, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302260.

Full text

Abstract:

Structure borne sound can travel multiple paths from one office to another and choosing to sound insulate a specific building element can be difficult since all the building elements are connected together and form a coupled system. The current approach by engineers when investigating transmission paths between spaces in a building is using a computer model and assuming that the junctions are firmly clamped or free. Standardized measuring methods includes a large amount of measuring points on each side of a junction and excitation over large areas. This study intends to investigate if it is possible to gain valuable information with a small amount of measuring points in a field measurement by comparing the data with an analytical model and a finite element model. The field measurement consisted of excitation from an impulse hammer from two excitation points and three accelerometers placed on each side of the junctions and on both sides of the separating wall. The measurement took place in a office building, with no information about the structure other than length, width and thickness of the elements.The reduction over the junctions varied with frequency and no general conclusion could be made about the transmission paths. The results showed high vibration reduction over the junction in low frequencies which then decreased in higher frequencies. Measurement results in low frequencies coincided with the analytical model, that vibration reduction is high over a junction for lighter separating walls in low frequencies and decrease quickly as frequency increases. Different results over each junction was obtained depending on excitation point, which indicates that there is flanking transmission along with the fact that it is a complex coupled system.
Strukturburet ljud kan färdas flera olika vägar från ett kontor till ett annat och att ljudisolera en specifik vägg kan vara svårt då alla byggnadselement är ihopkopplade och skapar ett kopplat system. Den nuvarande metoden ingenjörer använder för att undersöka transmissionsvägar mellan rum är att skapa modeller i datorprogram där antaganden att byggnadselementen är fast inspända eller fritt upplagda är gjorda. Standardiserade mätmetoder använder sig av en stor mängd mätpunkter på båda sidor om knutpunkterna och excitationer över stora ytor. Den här studien avser att undersöka möjligheten att erhålla värdefull information med ett fåtal mätpunkter i en fältmätning genom att jämföra den samlade mätdatan med en analytisk modell och en FEM modell. Fältmätningen består av excitation med en impulshammare i två excitationspunkter och tre accelerometrar på vardera sida om knutpunkterna och båda sidor om skiljeväggen. Mätningen utfördes i en kontorsbyggnad, utan någon information om strukturen förutom längd, bredd och tjocklek på byggnadselementen.Reduktionen över knutpunkterna varierade i frekvens och inga generella slutsatser kunde göras angående transmissionsvägar. Resultaten visade hög reduktion i vibrationsskillnad över knutpunkterna i låga frekvenser vilket minskade med ökad frekvens. Mätningsresultaten stämde överens med den analytiska modellen i låga frekvenser, med avseende på att reduktionen över knutpunkter med lätt skiljevägg är hög i låga frekvenser och avtar med ökad frekvens. Resultaten över knutpunkterna var beroende på val av excitationspunkt vilket indikerar att mätresultaten innehåller flankerande transmissioner och att det är ett komplext kopplat system.

APA, Harvard, Vancouver, ISO, and other styles

6

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.

Full text

Abstract:

La sonorité de l’échappement joue un rôle significatif sur le confort acoustique des occupants, ainsi que sur le caractère du véhicule. L’étude proposée porte sur la problématique industrielle suivante : « Description et quantification de la transmission du son entre la bouche d’échappement et l’intérieur du véhicule ». Physiquement la transmission sonore entre l’échappement et l’intérieur du véhicule s’effectue en trois étapes : Propagation des ondes sonores de la canule à la surface extérieure du véhicule et conversion en énergie vibratoire (1) ; Le bruit structurel se propage de la peau extérieure du véhicule à l’habillage intérieur (2) ; La surface intérieure du véhicule rayonne de l’énergie dans l’air à l’intérieur (3). Dans l’état de l’art proposé, la méthode de sous-structuration vibro-acoustique Patch Transfer Functions (PTF) est considérée comme une alternative viable à la problématique proposée. Cependant, avant d’appliquer la méthode sur un véhicule complet, la problématique suivante devait être résolue : « Caractérisation expérimentale d’un sous-système par des mesures sur un système couplé ». Ce manuscrit propose une méthode originale pour mesurer des fonctions de transfert d’un système découplé, sur la base de la réponse d’un système couplé. En raison de la nature mal posée du problème inverse, une méthode originale de régularisation a été proposée. La méthode a été validée pas des essais numériques, puis par un test physique
Exhaust 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

APA, Harvard, Vancouver, ISO, and other styles

7

Hermant, Nicolas. "Observation, modélisation et simulation des vibrations des maquettes de plis vocaux : applications à des configurations pathologiques." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT111/document.

Full text

Abstract:

Les travaux de cette thèse portent sur la compréhension des phénomènes physiques sous-jacents à la production normale ou pathologique de la voix. Certaines formes de pathologies pouvant concerner des affections structurelles des cordes vocales (polypes, paralysie, ...) et altérer de façon plus ou moins conséquente la mise en vibration des cordes vocales. Une partie de ces travaux porte ainsi sur l'observation expérimentale de la production de parole pathologique, grâce notamment à la mise au point d'une maquette auto-oscillante de cordes vocales artificielles. Celle-ci reprend la structure de latex remplie d'eau sous pressions des maquettes déjà développées au Gipsa-lab mais permet une plus grande indépendance des paramètres de contrôle. Un accent particulier des manipulations expérimentales est également porté sur la caractérisation mécanique des structures vibrantes, dont la connaissance est indispensable à la reproductibilité et la répétabilité des mesures ultérieures sur la maquette, ainsi qu'à l'analyse des résultats expérimentaux avec couplage aéroacoustique et la validation de modèles numériques associés.D'un côté, un calcul du comportement vibratoire des maquettes basée sur une méthode éléments finis a été mise oeuvre. Le modèle numérique développé utilise ainsi une formulation du couplage hydro-élastique entre le latex et l'eau qui constituent les maquettes et offre la possibilité de prendre en compte les grandes déformations et les pré-contraintes liées au gonflement du latex soumis à une forte pression d'eau. Finalement, un modèle d'écoulement glottique couplé à un modèle mécanique distribué de type "masse-raideur" a été utilisé et étendu pour simuler des comportements pathologiques tels que des asymétries (entre les deux cordes vocales et au sein d'une corde) ou la présence d'une masse ajoutée (kyste, polype). Un procédure d'optimisation de ce modèle sur une configuration expérimentale de référence permet alors de comparer les calculs aux observations des seuils d'oscillation sur les maquettes en présence d'une masse ajoutée
My PhD work has focused on understanding physical phenomena related to speech production in healthy and pathological conditions. Some pathologies affect the structure of the vocal folds which could lead to a more or less substantial alteration of their vibrations. Part of this work is experimental modeling of speech production applied to pathologies, with the development of a self-oscillating vocal fold replica. This replica is made of water-filled latex, such as have already been developed at Gipsa-lab, but it allows a larger independence within its control parameters and it can be used to reproduce pathological conditions. A particular interest is brought to mechanical characterization of these vibrating structures. This characterization is of primary importance when it comes to repeatability and reproducibility of measurements, as for the analysis of experimental results with aeroacoustic coupling and the validation and improvements of corresponding numerical models.Simulations of the vocal fold vibrating behavior based on the finite element method have been developed. The model uses a formulation of the hydro-elastic coupling between the latex and the water which the replica is made of. It also offers the possibility to take into account the large deformations and the prestress within the latex induced by water pressure. Another numerical approach is made using a theoretical laryngeal flow model coupled with a distributed mass-spring model and a set of resonators. Calculations of the dynamical system stability offer the possibility for comparisons with the experimental setup through a finite set of parameters. This model is adapted to simulate pathological conditions such as asymmetries and the presence of growths (cysts, polyps). Finally, an optimization calculation of this model on an experimental reference configuration of the replica allows us to compare the calculations with the measurements on this replica with the presence of a polyp

APA, Harvard, Vancouver, ISO, and other styles

8

Chesne, Simon. "IDENTIFICATION D'EFFORTS AUX LIMITES DES POUTRES ET PLAQUES EN FLEXION PAR METHODE INDIRECTE." Phd thesis, INSA de Lyon, 2006. http://tel.archives-ouvertes.fr/tel-00135492.

Full text

Abstract:

Le travail de cette thèse s'intéresse à l'identification des efforts (effort tranchant ou moment fléchissant)
présents aux limites des structures (plaques ou poutres) à partir de déplacements mesurés. Les expressions analytiques de ces
efforts contiennent des termes proportionnels aux dérivées spatiales du déplacement. L'approximation de ces dérivées aux
limites d'une structure est problématique car ces dernières sont très sensibles aux erreurs de mesure et les méthodes classiques
de calcul (différences finies, méthodes modales, transformée de Fourier spatiales, ...) et de régularisation (filtrage en nombre
d'onde, troncature modale) pour les obtenir ne sont pas adaptées pour une identification aux limites d'un domaine spatial.
Dans ce travail, une approche mathématique est proposée. Il s'agit de calculer les efforts aux limites, sans
utiliser directement leurs expressions analytiques qui contiennent les dérivées spatiales. La méthode est basée sur un calcul
intégral de l'équation de mouvement de la structure considérée, multipliée par une fonction test, qui vérifie des conditions aux
limites particulières. Ces conditions permettent d'extraire, lors du développement du calcul, les efforts recherchés à la limite du
domaine (efforts tranchant ou moment fléchissant).
La technique est développée dans les cas mono dimensionnel (poutre) et bidimensionnel (plaque). Des
simulations numériques illustrent la méthode, testent la robustesse de la méthode, les effets de différent bruits de mesure sur
l'identification, et établissent les limites spatiales et fréquentielles de l'approche. Des expérimentations ont été menées,
montrant la faisabilité de la méthode d'identification en utilisant des mesures réelles.

APA, Harvard, Vancouver, ISO, and other styles

9

Bessac, François. "Utilisation des valeurs propres et vecteurs propres de couplage pour étudier le comportement vibro-acoustique de systèmes couplés." Phd thesis, INSA de Lyon, 1996. http://tel.archives-ouvertes.fr/tel-00132853.

Full text

Abstract:

La caractérisation fine des mécanismes mis en jeu lors du couplage de systèmes vibrants est indispensable pour réduire le volume des calculs (ou le nombre de données à manipuler) nécessaires à la description correcte des phénomènes vibratoires résultants. Dans ce cadre, une nouvelle méthodologie a été développée puis appliquée au cas de deux plaques couplées par un ou plusieurs ressorts.
Fondée sur une approche modale et un formalisme vectoriel, elle s'appuie sur l'exploitation d'une matrice de couplage adimensionnelle qui décrit les échanges entre les deux plaques. Cette matrice admet autant de valeurs propres de couplage (quantités totalement déterministes) que de ressorts entre les plaques. Ces valeurs propres sont représentatives de la force du couplage tandis que les vecteurs propres indiquent les chemins modaux de transmissions. L'utilisation de ces quantités propres permet de reconstruire l'état vibratoire des plaques après couplage connaissant leur état avant couplage (en configuration découplée bloquée).
Une méthode simplifiée est développée dans le cas du couplage multiple. Le chemin de transmission dominant est identifié par l'examen et le tri des valeurs propres de couplage. Le fait de ne garder que la contribution correspondant à ce chemin modal dominant donne d'excellents résultats, l'erreur maximum par rapport à la solution de référence atteignant 3 dB aux plus hautes fréquences.
L'application expérimentale de cette méthodologie est possible puisque les valeurs propres de couplage sont mesurables. La méthode s'apparente à une approche de type mobilité, à la différence près que les grandeurs à mesurer sont en configuration découplée bloquée, ce qui permet d'éviter les fréquences singulières inhérentes à l'approche par mobilité classique. Dans des conditions de couplage multiple, l'application de la méthode simplifiée confirme la qualités des résultats obtenus précédemment de façon numérique.

APA, Harvard, Vancouver, ISO, and other styles

10

Sikström, Johannes. "Vibro-acoustic analysis of a satellite reflector antenna using FEM." Thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-39875.

Full text

Abstract:

The acoustic environment generated during launch is the most demanding structural load case for large, lightweight satellite reflector antennas. The reflector is exposed to extremely high sound pressure levels originating from the structural excitation of the rocket engines and exterior air flow turbulence. This thesis aims to predict the structural responses in the reflector due to the acoustic pressure load with a model based on Finite Element Modelling (FEM). The FE-model is validated against a previously performed Boundary Element Method (BEM) analysis. An approach called Split Loading together with a combination of BEM and FEM will be utilized to handle the surrounding air mass and the applied sound pressures. The idea of Split Loading is to divide the structure into several patches and apply a unit pressure load to each patch separately. In the last step the unit pressure is scaled and correlated by a power spectral density calculated from the acoustic pressures. Split Loading will be implemented in software packages MSC.NASTRAN/PATRAN. The model developed in this thesis handles both the added mass of the surrounding air and the sound pressure applied to the reflector. The model can qualitatively well reproduce the results of the BEM-analysis and the test data. However, the model tends to overestimate responses at low frequencies and underestimate them at high frequencies. The end results is that the model becomes too conservative at low frequencies to be used without further development.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Vibrations-Acoustics"

1

Anselmet, Fabien, and Pierre-Olivier Mattei. Acoustics, Aeroacoustics and Vibrations. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119178361.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Musgrave, M. J. P. Crystal acoustics: Introduction to the study of elastic waves and vibrations in crystals. [Melville, NY]: Acoustical Society of America, 2003.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

Parker, Barry R. Good vibrations: The physics of music. Baltimore: Johns Hopkins University Press, 2009.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

Good vibrations: The physics of music. Baltimore: Johns Hopkins University Press, 2009.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

5

Cremer, L. Structure-Borne Sound: Structural Vibrations and Sound Radiation at Audio Frequencies. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

6

D, Snyder Scott, ed. Active control of noise and vibration. London: E. & F.N. Spon, 1997.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

7

Hansen, Colin H. Active control of noise and vibration. 2nd ed. Boca Raton, FL: Taylor & Francis, 2013.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

8

1960-, Bell Douglas H., ed. Industrial noise control: Fundamentals and applications. 2nd ed. New York: M. Dekker, 1994.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

9

Anselmet, Fabien, and Pierre-Olivier Mattei. Acoustics, Aeroacoustics and Vibrations. Wiley & Sons, Incorporated, John, 2016.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

10

Acoustics, Aeroacoustics and Vibrations. Wiley & Sons, Incorporated, John, 2016.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Book chapters on the topic "Vibrations-Acoustics"

1

Sentpali, Stefan, and Rupert Hintersteiner. "Acoustics and Vibrations." In Steering Handbook, 121–47. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-05449-0_6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Kythe, Prem K. "Vibrations and Acoustics." In Handbook of Conformal Mappings and Applications, 631–56. Boca Raton, Florida : CRC Press, [2019]: Chapman and Hall/CRC, 2019. http://dx.doi.org/10.1201/9781315180236-20.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Chaigne, Antoine. "Structural Acoustics and Vibrations." In Springer Handbook of Acoustics, 941–1000. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-0755-7_22.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Chaigne, Antoine. "Structural Acoustics and Vibrations." In Springer Handbook of Acoustics, 901–60. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30425-0_22.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Anselmet, Fabien, and Pierre-Olivier Mattei. "Fluid Acoustics." In Acoustics, Aeroacoustics and Vibrations, 65–103. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119178361.ch4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Anselmet, Fabien, and Pierre-Olivier Mattei. "Vibrations of Thin Structures." In Acoustics, Aeroacoustics and Vibrations, 219–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119178361.ch7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Anselmet, Fabien, and Pierre-Olivier Mattei. "A Bit of History." In Acoustics, Aeroacoustics and Vibrations, 1–8. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119178361.ch1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Anselmet, Fabien, and Pierre-Olivier Mattei. "A Few Situations Closer to Reality." In Acoustics, Aeroacoustics and Vibrations, 403–73. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119178361.ch10.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Anselmet, Fabien, and Pierre-Olivier Mattei. "Implementation and Usage of Numerical Simulations." In Acoustics, Aeroacoustics and Vibrations, 475–89. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119178361.ch11.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Anselmet, Fabien, and Pierre-Olivier Mattei. "Elements of Continuum Mechanics." In Acoustics, Aeroacoustics and Vibrations, 9–30. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119178361.ch2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Vibrations-Acoustics"

1

Fiorentin, Thiago Antonio, Lucas Beletatti, and Murilo Henrique Pfleger. "Analysis of Vibrations and Acoustics on Riding Lawn Mower." In SAE BRASIL 2021 Web Forum. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2022. http://dx.doi.org/10.4271/2021-36-0075.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Manning, Jerome E. "Statistical Energy Analysis of Fluid-Filled Piping Vibrations and Acoustics." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32685.

Full text

Abstract:

The flow of vibratory energy in turbo-machinery piping systems can contribute significantly to the noise emission. Fluctuating pressures and mechanical vibrations of pumps and valves generate coupled vibration and acoustic waves that propagate throughout the system and radiate noise to the surrounding acoustic space. Statistical energy analysis provides a method to analyze the energy transmitted by these waves and to develop noise and vibration mitigation designs. The development of SEA models requires that special consideration be given to piping elbows and tees, where the coupling between structural vibrations and fluid acoustic waves may be high. This paper reviews the development of piping system prediction models and their limitations. A mobility-based approach is described to improve predictions at mid-frequencies where both statistical energy and finite element procedures often fail to provide accurate predictions.

APA, Harvard, Vancouver, ISO, and other styles

3

Saetti, Umberto, Kenneth Brentner, and Joseph Horn. "Linear Time-Invariant Models of Rotorcraft Flight Dynamics, Vibrations, and Acoustics." In Vertical Flight Society 77th Annual Forum & Technology Display. The Vertical Flight Society, 2021. http://dx.doi.org/10.4050/f-0077-2021-16842.

Full text

Abstract:

The paper discusses the development of a novel linearization algorithm to obtain high-order linear time-invariant (LTI) models of the coupled rotorcraft flight dynamics, vibrations, and acoustics. To demonstrate the methodology, the study makes use a nonlinear simulation model of a generic utility helicopter (PSU-HeloSim) that is coupled with an aeroacoustic solver based on a marching cubes algorithm. First, a revisited harmonic balance algorithm based on harmonic decomposition is applied to find the periodic equilibrium and approximate high-order LTI dynamics at 80 kts level flight. Next, the proposed output linearization scheme is applied to derive time-invariant, linearized equations of the main rotor forces and moments, and acoustics. Simulations are used to validate the response of the linearized models against that from nonlinear simulations. Additionally, the cost of linearization and potential performance benefits of employing linear models versus nonlinear simulations are assessed. The high-order LTI models thus obtained are shown to provide similar acoustic predictions compared to those of nonlinear simulations for small amplitude maneuvers, but at a fraction of the computational cost. These linear simulations are shown to run in the order of thousands of times faster than real time, and four orders of magnitude faster than nonlinear acoustic predictions based on a marching cubes algorithm.

APA, Harvard, Vancouver, ISO, and other styles

4

Niezrecki, Christopher, Harley Cudney, Christopher Niezrecki, and Harley Cudney. "Active control technology applied to rocket fairing structural vibrations and acoustics." In 38th Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-1255.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Niezrecki, Christopher, and Harley H. Cudney. "Feasibility of using piezoelectric actuators to control launch vehicle acoustics and structural vibrations." In SPIE's 7th Annual International Symposium on Smart Structures and Materials, edited by Jack H. Jacobs. SPIE, 2000. http://dx.doi.org/10.1117/12.388156.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Mishra, Rajat, and Liang Jie Wong. "Comprehensive Monitoring of Assets in Oil & Gas Plant Using Acoustics and Vibrations." In Offshore Technology Conference. OTC, 2023. http://dx.doi.org/10.4043/32356-ms.

Full text

Abstract:

Abstract The Oil and Gas plants operate using a network of pipelines as well as mechanized machines that help in both extraction as well as transmission of the product. These assets have an important role in maintaining an overall health of the plan and thus require regular maintenance. This maintenance is often subjective and still leads to failures, resulting in downtime and thus affecting the revenue hours of a particular asset. We suggest a comprehensive solution for monitoring both the motorized assets and the pressurized pipelines in an oil and gas plant using acoustics and vibrational analysis. This solution is currently being tested for monitoring large and small diameter pipelines as well as pumps in water reclamation or desalination plants in Singapore and could be easily opted for O&G industry.

APA, Harvard, Vancouver, ISO, and other styles

7

Ozer, Mehmet Bulent, and Thomas J. Royston. "Applications of the Sherman-Morrison Matrix Inversion Formula in Linear and Non-Linear Vibrations, Controls and Acoustics." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48554.

Full text

Abstract:

Applications of the Sherman-Morrison matrix inversion formula are reviewed and demonstrated for several problems in sound and vibration control. The inversion formula enables one to easily separate the effect of a perturbation or subcomponent on the dynamic behavior of the overall system. Applications of this technique that are demonstrated here include: identifying optimal PZT electrical shunt parameter values to minimize sound radiation from a PZT-plate structure, identifying the optimal location and parameter values of a tuned dynamic vibration absorber attached to a multi-degree of freedom, damped system, and identifying and quantifying an isolated non-linearity in an otherwise linear system. Extensions to active control system design are also discussed.

APA, Harvard, Vancouver, ISO, and other styles

8

Zueck, Robert F. "The Evolved Motions of a Marine Riser or Pipeline." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62970.

Full text

Abstract:

Abstract Analytical, experimental and computational models have historically been heavily simplified, linearized, and otherwise reduced. This paper shows how such model reductions eliminate the fundamental geometric changes that determine real behavior in cables, strings, moorings, guys, pipelines, riser, plates, skins, subsea hulls, and other such slender and thin structures. The paper details each physical quantity that we must add back into our overly reduced models to improve the basic nature, evolution, and accuracy of the resulting motions and vibrations. For example, even slight changes in local rotation anywhere along a cable can create large nonlinear changes in the dynamic nature of its behavior. The evolved complexity of the resulting global motions and vibrations in space and time often defy what we normally expect from such a simple structure. Although this paper focuses on the modeling of deep-water moorings and risers of an ocean platform, the same geometric effect is fundamental to most science and engineering models. Understanding how small changes in geometry can nonlinearly affect any structured behavior will help demystify much of the poorly-understood motions and vibrations in a large diversity of applications, including induced vibrations, sound, structural acoustics, aero-elasticity, sound, light and atomic radiation.

APA, Harvard, Vancouver, ISO, and other styles

9

Moussou, P., Th Papaconstantinou, and J. Cohen. "Scaling the Vibrations of Water Pipes: Application to Industrial Case Studies." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93831.

Full text

Abstract:

A scaling approach for the vibrations of water pipes was proposed in the ASME PVP 2005 Conference. Using a single hole orifice in non-cavitating conditions as a reference noise source, the vibrations of a piping system were estimated on the basis of plane wave propagation for the acoustics, and on the basis of vibrating beams for the structure. The scaling of the velocity Power Spectral Density (PSD) of a pipe is then a function of the pressure drop of the device considered, of the inner and outer diameters of the pipe, of the flow velocity, of the support spacing and of the densities of steel and water. The present paper describes the application of the scaling approach to industrial case studies: velocity PSD were measured on a sample of piping systems with pressures varying from 3 to 100 bars, with flows varying from 30 to 1000 m3/h and with hydraulic powers varying from 10 to 200 kW. The sources of vibrations were orifices, globe valves and butterfly valves in turbulent or cavitating regimes, and centrifugal pumps operating at nominal or partial flow regimes. In most cases, the measured data match the scaling law based on the single hole orifice noise, as an order of magnitude. A closer look reveals that different sources of vibrations exhibit recognizable patterns; the partial flow regime of a centrifugal pump generates a velocity PSD different from the nominal regime, and the cavitation of a globe valve generates a velocity PSD very different from the one generated by the cavitation of a single hole orifice. Typical non-dimensional spectra are proposed for each type of noise generating device.

APA, Harvard, Vancouver, ISO, and other styles

10

Berro, Hassan, and Pierre Moussou. "Vibration Spectrum of a Water Pipe Under the Effect of Unsteady Fluid Loading." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45288.

Full text

Abstract:

A simplified method for estimating the vibrations of water pipes under the effect of unsteady fluid flows is proposed. The first natural frequencies of water pipes being about some 10 Hz due to standard design rules, and supports being arranged with spans of the order of 5 m, the fluid flow can reasonably be described as incompressible, so that acoustics do not play a significant role within this framework. Assuming for the sake of simplicity that the fluid velocity field is the gradient of a potential, it generates an inertial pressure field along the pipe. Simple equations are derived for describing the fluid flow associated with a given mode shape of the pipe, and coupled equations are provided which link the unsteady fluid flow to the vibrations. A simple test case is provided, which supports the idea that for water pipes, the vibration velocity of the structure and the unsteady fluid velocity are in the same order of magnitude.

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Vibrations-Acoustics"

1

McDaniel, J. G., Pierre Dupont, Wenyuan Chen, and Elizabeth Magliula. Emerging Research Initiatives in Structural Acoustics and Vibrations. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada442160.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!