Relevant bibliographies by topics / Vibroacoustic Analysis

Academic literature on the topic 'Vibroacoustic Analysis'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Vibroacoustic Analysis"

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Burdzik, Rafał, Paweł Słowiński, and Łukasz Konieczny. "Preliminary studies of vibroacoustic signal images in the context of identification of a passing rail vehicle." WUT Journal of Transportation Engineering 121 (June 1, 2018): 31–40. http://dx.doi.org/10.5604/01.3001.0014.4552.

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Passing rail vehicles generate vibrations and noise. In most studies, these phenomena are analyzed in terms of impact on people, the environment and railway infrastructure. However, using the vibroacoustic methodology, generated vibration and noise signals can be treated as information carriers. The vast majority of publications in the field of vibroacoustics analyze the usability of signals to determine the technical condition of machines and systems. For many years Professor Rafał Burdzik has been conducting research in the area of vibration and noise propagation analysis in means of transport. As a result of this work, a new research hypothesis was developed as the ability to identify a vehicle or trainset based on recorded images of vibroacoustic signals. The article presents the results of preliminary tests, during which rail vibrations were recorded in three orthogonal axes and acoustic pressure signals in the axis perpendicular to the railway route.
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D'Amico, R., A. Pratellesi, M. Pierini, and N. Baldanzini. "Stochastic BEM for the Vibroacoustic Analysis of Three-Dimensional Structures." Advances in Acoustics and Vibration 2011 (July 24, 2011): 1–12. http://dx.doi.org/10.1155/2011/952407.

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Nowadays, extending the NVH prediction reliability to the whole frequency range is an attractive goal of vibroacoustics. Deterministic methodologies are well established for the low-frequency range, but, decreasing the wavelength, energy-based methods are necessary. In such a range, a crucial role is played by small perturbations which highly influence the response sensitivity. Moreover, taking into account these variations allows to make the product design more robust and even quicker. Introducing geometrical uncertainties within the classic BEM formulation allows to obtain the so-called stochastic BEM. As a result, the solution shows deterministic behaviour at low frequencies; decreasing the wavelength, the effect of the uncertainties smooths the response. Consequently, it is possible to obtain an averaged trend over the whole frequency range which asymptotically tends to the deterministic one. In this paper, we deal with three-dimensional acoustic SBEM. First, the formulation and its basic assumptions are presented. Secondly, they are applied to academic cases to show its potentialities in predicting vibroacoustic behaviour over a wide frequency range.
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Yao, Degui, Longfei Li, Songyang Zhang, Dianhai Zhang, and Dezhi Chen. "The Vibroacoustic Characteristics Analysis of Transformer Core Faults Based on Multi-Physical Field Coupling." Symmetry 14, no. 3 (March 7, 2022): 544. http://dx.doi.org/10.3390/sym14030544.

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Power transformers play an important role in the safe and reliable operation of the whole power grid. Once a fault occurs, it will endanger the normal operation of the transformer, and even result in power grid accidents. Accurate and practical methods of transformer fault monitoring and type identification have attracted extensive attention in the field of electrical engineering. However, it is difficult to obtain a large number of measurement data for different fault types on a large power transformer. The vibroacoustic characteristics of transformer faults have significant asymmetry. For the power transformer in service, it is complex and uneconomic to obtain the vibroacoustic signals under different fault conditions. To handle this problem, this paper proposes simulation methods of several common transformer core faults, based on multi-physical field coupling, and then analyzes the vibroacoustic signals generated by the operating transformer. Finally, it verifies the results of acoustic and vibration signals under several faults, through physical experiments. The results show that the transformer fault simulation method is reasonable and accurate. Furthermore, a change in the transformer core state will cause a change in the transformer vibroacoustic characteristics, and different types of core faults can be distinguished by the analysis of vibroacoustic characteristics.
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ZHENG, HUI, and ZHIPING WEI. "VIBROACOUSTIC ANALYSIS OF STIFFENED PLATES WITH NONUNIFORM BOUNDARY CONDITIONS." International Journal of Applied Mechanics 05, no. 04 (December 2013): 1350046. http://dx.doi.org/10.1142/s1758825113500464.

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This paper deals with vibroacoustic analysis of bidirectional stiffened thin plates with nonuniform discrete elastic edge restraints. The displacement-like governing equation of motion of the stiffened plate is derived by applying energy approach. A series of simple polynomials satisfying the Rayleigh–Ritz convergence criteria as well as the edge boundary conditions are then applied to discretize the governing equation, and the transverse displacements of the plate are solved considering the excitation of an incident acoustic plane wave. The commonly-adopted vibroacoustic indicators of elastic plane surface, i.e., mean square velocity (MSV), radiation efficiency (σ) and sound transmission loss (STL), are calculated for the stiffened plate with uniform and nonuniform discrete boundary conditions (BCs). Numerical studies are performed and results are discussed in detail for the vibroacoustic performance of the plate with different edge elastic restraints.
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Kao, Pi‐Jen, and M. A. Hamdi. "Sensitivity analysis for vibroacoustic interior problems." Journal of the Acoustical Society of America 102, no. 5 (November 1997): 3113. http://dx.doi.org/10.1121/1.420557.

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ANDO, Shigemasa, and Qinzhong SHI. "Vibroacoustic Analysis of Satellite Equipment Panel." Transactions of the Japan Society of Mechanical Engineers Series C 72, no. 720 (2006): 2462–69. http://dx.doi.org/10.1299/kikaic.72.2462.

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Bentow, Brian, Jonathan Dodge, Aaron Homer, Christopher D. Moore, Robert M. Keller, Craig Lee, Mark Thomas, et al. "Grid-enabling a vibroacoustic analysis toolkit." International Journal of High Performance Computing and Networking 5, no. 3 (2008): 168. http://dx.doi.org/10.1504/ijhpcn.2008.020861.

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Borucki, Sebastian, Andrzej Cichoń, Henryk Majchrzak, and Dariusz Zmarzły. "Evaluation of the Technical Condition of the Active Part of the High Power Transformer Based on Measurements and Analysis of Vibroacoustic Signals." Archives of Acoustics 42, no. 2 (June 27, 2017): 313–20. http://dx.doi.org/10.1515/aoa-2017-0033.

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Abstract This article presents the results of research connected with the development and industrial use of vibroacoustic methods for the evaluation of the technical condition of the active part of transformers. The article presents the results of the analysis of vibrations generated by the high power transformer in which a defect was found on the basis of tests of oil carried out using the chromatography tests. In order to confirm the damage of the active part of this transformer, vibroacoustic measurements were performed in three states of its operation. The measurement using the classical vibroacoustic method included the registration of vibrations at the idle speed and during the load operation of the transformer. The original diagnostic method, so-called the modified vibroacoustic method, was also used during the measurement. The analysis of signals recorded using the classical vibroacoustic method was carried out in the frequency domain by indicating the amplitude of even harmonic vibrations. However, the analysis of signals measured during the commissioning of the transformer was conducted in the time-frequency domain using the short-time Fourier transform (STFT), continuous wavelet transform (CWT), and discrete wavelet transform (DWT). On the basis of the analysis of the results obtained it was stated that the increased level of vibrations of this transformer is a consequence of the loss of rigidity of the mechanical structure of its core.
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Rychlik, Arkadiusz. "DETECTION OF STRUCTURAL DAMAGE IN VIBROACOUSTIC ANALYSIS." Journal of KONES. Powertrain and Transport 23, no. 1 (January 1, 2016): 279–88. http://dx.doi.org/10.5604/12314005.1213589.

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Côté, André F., Noureddine Atalla, and Jean-Louis Guyader. "Vibroacoustic analysis of an unbaffled rotating disk." Journal of the Acoustical Society of America 103, no. 3 (March 1998): 1483–92. http://dx.doi.org/10.1121/1.421286.

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Dissertations / Theses on the topic "Vibroacoustic Analysis"

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Welch, Barry Alan. "Semiclassical analysis of vibroacoustic systems." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433930.

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Oliver, Serna Clara. "Vibroacoustic analysis of car door and window seals." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC023.

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Les joints de porte et de vitrage des voitures jouent un rôle très important dans la réduction du bruit d’origine aérodynamique, à la fois par transmission directe et de par son rôle en tant que condition limite ees autres éléments transmetteurs (portes et fenêtres). Par conséquent, sa conception est fondamentale pour l’optimisation du confort de passager. Néanmoins, la méthode traditionnelle pour sa conception, basée sur une approche par tâtonnement de tests en soufflerie, est très coûteuse et insuffisante. Une approche différente est envisagée dans ce manuscrit, par la création d’un modèle capable de prédire la transmission du bruit jusqu’`a la cavité du véhicule, qui puisse être appliqué ultérieurement dans une routine d’optimisation. La modélisation des joints de vitrage et des fenêtres fait face à plusieurs difficultés. La fermeture de la porte subie par le joint de porte avant d’être soumis à l’excitation acoustique, ainsi que le comportement hyperélastique du caoutchouc, mènent à des déformations non-linéaires. Ce comportement change les propriétés (telles que la rigidité) du joint comprimé lors qu’il est soumis à l’excitation acoustique. De plus, l’interaction du son transmis par les joints avec la cavité du véhicule doit être prise en compte. Néanmoins, la taille réduite et la géométrie complexe du joint appellent à une approche telle que la méthode EF, tandis que la grande taille de la cavité véhicule nécessite d’une approche plus grossière, pour ne pas aboutir sur un modèle trop lourd. La solution proposée dans ce manuscrit implique la création d’un modèle hybride capable de modéliser le joint et la cavité séparément, avec l’approche la plus adaptée `a chaque cas, et de les coupler dans un seul modèle. Les comportements hyperélastique et viscoélastique des joints, avant et durant l’excitation acoustique, sont modélisés à l’aide du code commercial ABAQUS, tandis qu’une méthode énergétique appelée Méthode Energétique Simplifiée est utilisée pour la propagation ´ du son depuis les joints jusqu’au reste de la cavité. Cette méthode, adaptée aux besoins de l’application souhaitée, et couplée aux résultats du modèle EF, permet l’obtention rapide et locale du niveau de pression acoustique en n’importe quel point de la cavité. Finalement, des campagnes expérimentales sont mises en œuvre pour la validation des modèles. Les mises en place et les résultats sont détaillés dans ce manuscrit
Car door and window seals have been proven to be of utmost importance to reduce aerodynamic noise, both through direct transmission and through their role as boundary conditions of the other transmitting elements (car doors and windows). As consequence, their design has become of great relevance when it comes to passenger comfort optimization. However, the traditional method for their conception, based on a trial and error approach through wind-tunnel testing, has been found to be insufficient and costly. A different approach is contemplated in this dissertation, through the development of a model capable of predicting sound transmission through seals and into the vehicle cavity, for its subsequent application into an optimization procedure. Several difficulties arise from the modeling of car door and window seals. Indeed, the door closure imposed on the door seal before any acoustic excitation, as well as the hyperelasticity of the rubber lead to a non-linear deformation behavior. This behavior changes the seal properties (e.g. stiffness) which have to be modeled under acoustic excitation. Additionally, the interaction of the transmitted sound with the vehicle cavity must be taken into account. However, the small, precise geometry of the seal would call for an approach such as FE method, whereas the big dimensions of a vehicle cavity demand a much coarser approach so that the problem doesn’t become unmanageable in size. The solution that is proposed in this dissertation, implies the creation of an hybrid model capable of modeling the seal and the vehicle cavity separately, with the most adequate approach to each case, and coupling them afterward into a single model. As consequence, the hyperelastic and viscoelastic behaviors of the seals, prior to and during the acoustic excitation, are modeled through FE software ABAQUS, whereas an energy method called Méthode Energétique Simplifiée is used for the propagation ´ of the sound from the seal to the rest of the cavity. This method, improved to better suit the requirements of the discussed application, and coupled to the results of the FE model, allows a fast and local computation of the sound pressure level at any point inside the cavity. Finally, some experimental tests are put in place for the validation of the models. The different setups and results are detailed in this dissertation
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Bonilha, Murilo Weingarten. "A hybrid deterministic-probabilistic model for vibroacoustic studies." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242537.

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Arjunan, Rajesh. "Vibroacoustic parametric analysis of honeycomb composite fuselage for improved transmission loss." Thesis, Wichita State University, 2007. http://hdl.handle.net/10057/1530.

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Much research has been done on reducing the noise level within a honeycomb composite fuselage used in aircraft. The honeycomb composite fuselage has shown much promise for structural rigidity, but to reduce cabin noise, transmission loss and radiation efficiency of the honeycomb fuselage must be taken into consideration in the initial design stage. This thesis is a parametric study of a honeycomb composite fuselage for improving the acoustical performance by reducing transmission loss through the panel. Various models of honeycomb composite were modeled using HyperMesh, a modeling software. The structural model was validated statically with four-point bend-test data and by means of modal analysis, by correlation of composite panel analytical results to published benchmark results. The composite panel model was also validated by correlating the panel transmission loss results using vibroacoustic analysis using VA One software to the published benchmark results. Physical parameters, including length and thickness of the honeycomb panels, were varied and modeled. Geometric properties such as length, thickness, and material properties including Young’s modulus and shear modulus were selected for the validated model. A parametric study was then done to find an improved transmission loss by varying the core thickness, core cell size and core density, and by adding plies, limp material and noise-control treatments.
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering
"December 2007."
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Arjunan, Rajesh Soschinske Kurt A. "Vibroacoustic parametric analysis of honeycomb composite fuselage for improved transmission loss /." Thesis, A link to full text of this thesis in SOAR, 2007. http://hdl.handle.net/10057/1530.

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Liu, Hao. "Wave Modelling Techniques for Medium and High Frequency Vibroacoustic Analysis Including Porous Materials." Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-151271.

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Numerical methods based on wave modelling are explored for the vibroacoustic analysis of wave propagation, sound transmission and interior noise in vehicles and buildings at medium and high frequencies. The presence of sound absorbing porous materials in practical engineering structures is also considered. The wave modelling techniques provide computational efficiency and physical insight, and two such methods having these advantages are developed in this thesis namely: the semi-analytical finite element method and the wave expansion method. The semi-analytical finite element method is applicable to structures which have constant properties in one direction, and it uses a finite element discretization of the cross-section and analytical functions in the third direction. Equations of motion are derived from this method to study wave propagation characteristics, which help understand the vibroacoustic behavior of structures. These characteristics may also be used by high frequency techniques, such as statistical energy analysis. The wave propagation in sandwich panels with a poroelastic core, which is modeled with Biot's theory, is investigated thoroughly. The semi-analytical finite element method retains the flexibility of the finite element method on geometry and also dramatically increases the computational speed thanks to the orthogonality of the analytical functions when used to calculate forced response. The calculated response of partitions is integrated into diffuse field sound transmission loss calculations of, for example, built-up train floor partitions and multilayer panels lined with porous materials. The calculations are computationally efficient and show good agreement with measurements, thus it is interesting for industrial optimizations. The wave expansion method uses a priori defined plane wave solutions to the Helmholtz equation for approximation of the sound field in geometrically complex enclosures. It reduces the requirements regarding the number of degrees of freedom compared to the finite element method, which, furthermore, is polluted by dispersion errors. Therefore, the wave expansion method is particularly appealing for high frequency (or large wavenumber) calculations. Its application in interior sound field predictions is assessed within the automobile context.

QC 20140916

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Tufano, Anna Rita. "Vibroacoustic coupling phenomena on heavy vehicles.Medium frequency experimental analysis and numerical applications for design specifications." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC052.

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La prestation vibroacoustique est une question primordiale pour les constructeurs de véhicules, qui sont contraints par des lois ainsi que par des besoins commerciales: d'une part, un grand nombre de normes existe, visant à régler les niveaux vibratoires et acoustiques que les occupants d'un véhicule peuvent supporter, d'autre part le constructeur est intéressé à garantir un haut degré de confort pour que son produit soit compétitif. L'industrie du poids lourds comporte des spécificités par rapport à d'autres secteurs industriels, et surtout par rapport au marché des véhicules légers: non seulement l'architecture d'un véhicule industriel est unique, mais en plus ce qui caractérise les poids lourds par rapport à d'autres véhicules terrestres est la grande diversité des configurations disponibles. Une bonne connaissance des mécanismes de transmission des vibrations et du bruit, ainsi que du bilan de leurs sources, permette de fixer des règles de conception plus rigoureuses pour les composants. Par ailleurs, la connaissance des influences des paramètres architecturaux d'un camion sur les prestations vibroacoustiques donne une meilleure clé d'interprétation pour prédire les caractéristiques qu'un composant du véhicule doit avoir. Actuellement ces vérifications sont largement basées sur des essais, soit subjectifs (estimations par des techniciens experts) soit objectifs (acquisitions par microphones et accéléromètres). Cette pratique est très coûteuse car, pour prendre en compte la diversité des camions, il faut tester un grand nombre de véhicules. Pour franchir ces limitations, le prototypage virtuel - au lieu des essais physiques - doit être renforcé. Les méthodologies numériques sont déjà utilisées au sein du Groupe Volvo, mais les outils disponibles sont considérés en partie inappropriés pour les besoins de calcul des prestations NVH. Les activités de cette thèse ont été réalisées dans le cadre du service Noise and Driveline Vibration, qui est responsable de l'estimation du confort acoustique perçu par les occupants du camion, dans toutes ces conditions d'utilisation. Les travaux de thèse sont concentrés sur le comportement du châssis comme composant principale; le châssis est la principale voie de transfert des vibrations depuis le moteur vers la cabine. En outre, une attention particulière sera donnée à l'effet des accessoires sur le comportement dynamique du châssis, bien que peu d'intérêt sera porté sur la signature vibratoire des accessoires mêmes
The vibroacoustic performance is a matter of primary concern for modern vehicle manufacturers, that are constrained by health and safety legislation as well as by commercial needs: on the one hand, a number of norms exists regulating the level of vibration and noise that vehicle occupants can tolerate, but on the other hand a manufacturer is also interested in guaranteeing a high level of comfort in order to keep products competitive. The commercial vehicle industry presents some peculiarity with respect to other vehicle manufacturing businesses, and especially to the more known car industry: not only the architecture of a commercial vehicle is a class of its own, but what differentiates the most trucks from other ground vehicles are the configuration diversity and customization. A deep knowledge of the vibration and noise transmission mechanisms in trucks as well as source breakdown allows defining more rigorous and strict component specifications. Furthermore, the comprehension of the sensitivity of truck architecture parameters on vibroacoustic features provides even deeper means to assess the needed properties for a component to be installed on a vehicle. At present the verification is largely based on tests, both subjective (assessment by experimented test engineers) and objective (microphone and accelerometer acquisitions). This practice is extremely expensive, since, in order to take into account the large diversity of trucks, a large number of vehicles has to be tested. To overcome this limit, virtual testing - as opposed to physical testing - should be strengthened. Numerical methods are already largely used in the Volvo Group, but the available tools are considered partly unfit to the NVH demands and inappropriate with respect to their specific needs. The activities of the current thesis have been developed in the framework of the Interior Noise and Driveline Vibration group, which is responsible for the estimation of the acoustic comfort perceived by driver and passengers in all driving conditions and vehicle uses. This thesis will focus on the behaviour of the chassis as a primary component. The chassis is the main transfer path for engine-induced vibrations transmitted to the cabin. Besides, a peculiar attention will be given to the effect the chassis equipment components have on the chassis dynamics, even though limited interest will be put on the investigation of the dynamic signature of the equipment itself
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Deng, Jie. "Vibroacoustic modeling of acoustic blackhole applications in flat, curved andcomplex mechanical structures." Doctoral thesis, Universitat Ramon Llull, 2020. http://hdl.handle.net/10803/670666.

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Els forats negres acústics en mecànica (coneguts per les sigles ABHs, de l’anglès Acoustic Black Holes) solen estar formats per osques en bigues i plaques, el gruix de les quals decau segons una llei potencial. L’efecte de l’ABH és el d’alentir les velocitats de fase i de grup de les ones de flexió incidents de tal manera que, en teoria, faria falta un temps infinit perquè les ones arribessin al centre de l’ABH, si el gruix d’aquest últim fos exactament zero. Tanmateix, a la pràctica això no és possible tot i que es pot aconseguir una forta dissipació col·locant una capa de material esmorteïdor al centre de l’ABH, on es concentra la major part de l’energia de les ones. En els darrers anys, els ABHs no només s’han explotat com a mètode passiu per reduir vibracions estructurals i l’emissió corresponent de soroll, sinó que també s’ha explorat el seu potencial per altres aplicacions com la manipulació d’ones o la captació d’energia. Aquesta tesi té tres objectius principals. Així, doncs, després d'una introducció general als ABHs, el treball s’ha dividit en tres grans seccions. La primera aborda aplicacions dels ABHs en bigues rectes i plaques planes. Per començar, es proposa i s’analitza un voladís piezoelèctric amb un acabament d’ABH per capturar energia. A continuació es presenten ABHs en forma d’anell per tal d’aïllar punts d’excitació externs en plaques planes i així evitar la transmissió de vibracions. Finalment, es contemplen configuracions periòdiques de matrius d’ABHs per tal de col·limar feixos d'ones de flexió i concentrar la seva energia en zones predeterminades d’una placa. La segona part de la tesi proposa nous dissenys d’ABHs per a estructures amb curvatura. Aquestes són molt habituals en els sectors naval, aeronàutic i industrial, de manera que val la pena investigar si els ABH poden resultar alguns casos. La secció comença analitzant la inclusió d’ABHs en bigues circulars i es veu com això dona peu a l’aparició de fenòmens típics en sistemes periòdics. Acte seguit es proposa un ABH anular per reduir les vibracions en conductes cilíndrics. En concret, es tracten els casos d’un conducte simplement suportat amb un ABH anular, i el d’un conducte amb ABH, suports periòdics i rigidificadors. Per finalitzar la secció, s’investiguen els efectes dels ABH anulars en la radiació acústica del conducte tenint en compte el nivell de potència acústica, l’eficiència de radiació i la intensitat supersònica. La tercera part de la tesi és més curta que les anteriors i simula l’aïllament d'una placa amb múltiples ABHs, en el rang de mitja i alta freqüència. A tal efecte s’empra el mètode de l’anàlisi estadística de distribució modal d'energia (SmEdA: statistical modal energy distribution analysis). En aquesta secció, l’estructura amb ABHs ja no s’analitza com un element individual sinó que s’acobla a dues cavitats d’aire, formant part d’un sistema mecànic més complex. Al llarg de la tesi s’utilitza repetidament el mètode d’expansió gaussiana (GEM: Gaussian expansion method). Pel GEM entenem prendre funcions gaussianes com a base per resoldre equacions diferencials en derivades parcials en el marc del mètode de Rayleigh-Ritz. El GEM s’assembla molt als enfocaments d’ondetes, però ofereix alguns avantatges en el cas de condicions de contorn periòdiques. Al principi de la tesi s’exposa un breu repàs del GEM i, quan és necessari, s’aborda la seva reformulació per a un problema particular en el capítol corresponent.
Los agujeros negros acústicos en mecánica (conocidos por las siglas ABHs, del inglés Acoustic Black Holes) suelen estar formados por muescas en vigas y placas, el grueso de las cuales decae según una ley potencial. El efecto del ABH es el de ralentizar las velocidades de fase y de grupo de las ondas de flexión incidentes de tal modo que, en teoría, haría falta un tiempo infinito para que las ondas alcanzaran el centro del ABH, si el grueso de este último fuera exactamente cero. Sin embargo, en la práctica esto no es posible, aunque se puede conseguir una fuerte disipación colocando una capa de material amortiguador en el centro del ABH, donde se concentra la mayor parte de la energía de las ondas. En los últimos años, los ABHs no sólo se han explotado como método pasivo para reducir vibraciones estructurales y la consecuente emisión de ruido, sino que también se ha explorado su potencial para otras aplicaciones como la manipulación de ondas o la captación de energía. Esta tesis tiene tres objetivos principales. Así pues, tras una introducción general a los ABHs, el trabajo se ha dividido en tres grandes secciones. La primera aborda aplicaciones de los ABHs en vigas rectas y placas planas. Para empezar, se propone y analiza un voladizo piezoeléctrico con un acabado de ABH para capturar energía. A continuación, se presentan ABHs en forma de anillo para aislar puntos de excitación externos en placas planas y así evitar la transmisión de vibraciones. Finalmente, se contemplan configuraciones periódicas de matrices de ABHs para colimar haces de ondas de flexión y concentrar su energía en zonas predeterminadas de una placa. La segunda parte de la tesis propone nuevos diseños de ABHs para estructuras con curvatura. Estas son muy habituales en los sectores naval, aeronáutico e industrial, por lo que merece la pena investigar si los ABH pueden dar buenos resultados en algunos casos. La sección comienza analizando la inclusión de ABHs en vigas circulares y se ve como estos dan pie a la aparición de fenómenos típicos de sistemas periódicos. Seguidamente se propone un ABH anular para reducir las vibraciones en conductos cilíndricos. En concreto, se tratan los casos de un conducto simplemente soportado con un ABH anular, y el de un conducto con ABH, soportes periódicos y rigidificadores. Para finalizar la sección, se investigan los efectos de los ABH anulares en la radiación acústica del conducto teniendo en cuenta el nivel de potencia acústica, la eficiencia de radiación y la intensidad supersónica. La tercera parte de la tesis es más corta que las anteriores y simula el aislamiento de una placa con múltiples ABHs, en el rango de media y alta frecuencia. A tal efecto se emplea el método del análisis estadístico de distribución modal de energía (SmEdA: statistical modal energy distribution analysis). En esta sección, la estructura con ABHs ya no se analiza como un elemento individual, sino que se acopla a dos cavidades de aire formando parte de un sistema mecánico más complejo. A lo largo de la tesis se utiliza repetidamente el método de expansión gaussiana (GEM: Gaussian expansión method). Por GEM entendemos tomar funciones gaussianas como base para resolver ecuaciones diferenciales en derivadas parciales en el marco del método de Rayleigh-Ritz. El GEM se parece mucho a los enfoques de ondículas, pero ofrece algunas ventajas en el caso de condiciones de contorno periódicas. Al principio de la tesis se expone un breve repaso del GEM y, cuando es necesario, se aborda su reformulación para un problema particular en el capítulo correspondiente.
Acoustic black holes (ABHs) in mechanics usually consist of geometrical indentations on beams and plates having a power-law decreasing thickness profile. An ABH slows down the phase and group velocity of incident flexural waves in such a way that, ideally, it would take an infinite amount of time for them to reach the ABH center, if the latter had an exact zero thickness. Though this is not possible in practice, strong wave dissipation can be achieved by placing a damping layer at the central region of the ABH, where most vibration energy concentrates. In recent years, ABHs have been not only exploited as a passive means for structural vibration and noise reduction, but its potential for other applications like wave manipulation or energy harvesting have been also explored. The objective of this thesis is threefold. Therefore, after an initial overview the work is divided into three main parts. The first one deals with ABH applications on straight beams and flat plates. To start with, an ABH piezoelectric bimorph cantilever for energy harvesting is proposed and analyzed. Then, ring-shaped ABH indentations are suggested as a means of isolating external excitation points in flat plates and prevent vibration transmission. Finally, periodic ABH array configurations are contemplated to collimate flexural wave beams and focus energy at desired plate locations. The second part of the thesis proposes new ABH designs for curved structures. The latter are very common in the naval, aeronautical and industrial sectors so it is worth investigating if ABHs could function for them. The section starts analyzing the embedding of ABHs on circular beams and how this results in the appearance of typical phenomena of periodic systems. After that, an annular ABH is proposed to reduce vibrations in cylindrical shells. The cases of a simply supported shell with an annular ABH indentation and of a periodic simply supported ABH shell with stiffeners are considered. To finish the section, the effects of annular ABHs on sound radiation are investigated in terms of sound power level, radiation efficiency and supersonic intensity. The third part of the thesis is shorter than the previous ones and is devoted to analyzing the transmission loss of a plate with multiple ABH indentations, in the mid-high frequency range. Statistical modal energy distribution analysis is used for that purpose. Here, the ABH plate is not taken as an individual structure but coupled to two air cavities, thus being part of a more complex mechanical system. Throughout the thesis repeated use is made of the Gaussian expansion method (GEM). The GEM refers to taking Gaussian functions as the basis for solving partial differential equations in the framework of the Rayleigh-Ritz method. The GEM closely resembles wavelet approaches but offers some advantages in the case of periodic boundary conditions. A brief overview of the GEM is exposed at the beginning of the thesis and, when necessary, its reformulation for a particular problem is tackled in its corresponding chapter.
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Florens, Corine. "Modeling of the viscoelastic honeycomb panel equipped with piezoelectric patches in view of vibroacoustic active control design." Phd thesis, Ecole Centrale Paris, 2010. http://tel.archives-ouvertes.fr/tel-00545422.

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Active control has often been considered for low frequency control of noise radiated by trim panels inside aircraft or helicopter cabins. Trim panels are usually made of honeycomb core sandwich because of their high strength to mass ratio. Active control techniques applied to honeycomb panel have not always given results as good as expected and this thesis aims to understand these limitations based on validated mechanical models of the active panels. For the modeling of honeycomb panels, the main difficulty is to estimate equivalent properties for the core. A numerical homogenization procedure is introduced to estimate effective parameters of a shell/volume/shell model based on the correlation with periodic modes of a detailed 3D model. The use of periodic modes allows a detailed analysis of the influence of constituent properties, especially glue and skin. Tests show that the considered Nomex based honeycomb has significantly viscoelastic behavior. In the model, the viscoelastic behavior of the core is taken into account by a frequency dependence of material parameters. Piezoelectric actuators and sensors are included in the validated honeycomb model. Strategies for integration in a numerical design process are discussed. Finally, the static response to an applied voltage is shown to correspond to a blister shape with local bending of the skin rather than global bending of the panel. This behavior results in poor actuator performance, which is also found in a realistic panel configuration studied at ONERA.
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Chronopoulos, Dimitrios. "Prediction of the vibroacoustic response of aerospace composite structures in a broadband frequency range." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00787864.

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During its mission, a launch vehicle is subject to broadband, severe, aeroacoustic and structure-borne excitations of various provenances, which can endanger the survivability of the payload and the vehicles electronic equipment, and consequently the success of the mission. Aerospace structures are generally characterized by the use of exotic composite materials of various configurations and thicknesses, as well as by their extensively complex geometries and connections between different subsystems. It is therefore of crucial importance for the modern aerospace industry, the development of analytical and numerical tools that can accurately predict the vibroacoustic response of large, composite structures of various geometries and subject to a combination of aeroacoustic excitations. Recently, a lot of research has been conducted on the modelling of wave propagation characteristics within composite structures. In this study, the Wave Finite Element Method (WFEM) is used in order to predict the wave dispersion characteristics within orthotropic composite structures of various geometries, namely flat panels, singly curved panels, doubly curved panels and cylindrical shells. These characteristics are initially used for predicting the modal density and the coupling loss factor of the structures connected to the acoustic medium. Subsequently the broad-band Transmission Loss (TL) of the modelled structures within a Statistical Energy Analysis (SEA) wave-context approach is calculated. Mainly due to the extensive geometric complexity of structures, the use of Finite Element(FE) modelling within the aerospace industry is frequently inevitable. The use of such models is limited mainly because of the large computation time demanded even for calculations in the low frequency range. During the last years, a lot of researchers focus on the model reduction of large FE models, in order to make their application feasible. In this study, the Second Order ARnoldi (SOAR) reduction approach is adopted, in order to minimize the computation time for a fully coupled composite structural-acoustic system, while at the same time retaining a satisfactory accuracy of the prediction in a broadband sense. The system is modelled under various aeroacoustic excitations, namely a diffused acoustic field and a Turbulent Boundary Layer (TBL) excitation. Experimental validation of the developed tools is conducted on a set of orthotropic sandwich composite structures. Initially, the wave propagation characteristics of a flat panel are measured and the experimental results are compared to the WFEM predictions. The later are used in order to formulate an Equivalent Single Layer (ESL) approach for the modelling of the spatial response of the panel within a dynamic stiffness matrix approach. The effect of the temperature of the structure as well as of the acoustic medium on the vibroacoustic response of the system is examined and analyzed. Subsequently, a model of the SYLDA structure, also made of an orthotropic sandwich material, is tested mainly in order to investigate the coupling nature between its various subsystems. The developed ESL modelling is used for an efficient calculation of the response of the structure in the lower frequency range, while for higher frequencies a hybrid WFEM/FEM formulation for modelling discontinuous structures is used.
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Books on the topic "Vibroacoustic Analysis"

1

Engineering vibroacoustic analysis: Methods and applications. Chichester, West Sussex, United Kingdom: John Wiley & Sons Inc., 2016.

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Hambric, Stephen A., Shung H. Sung, and Donald J. Nefske, eds. Engineering Vibroacoustic Analysis. Wiley, 2016. http://dx.doi.org/10.1002/9781118693988.

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Hambric, Stephen A., Shung H. Sung, and Donald J. Nefske. Engineering Vibroacoustic Analysis: Methods and Applications. Wiley & Sons, Incorporated, John, 2016.

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Hambric, Stephen A., Shung H. Sung, and Donald J. Nefske. Engineering Vibroacoustic Analysis: Methods and Applications. Wiley & Sons, Incorporated, John, 2016.

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Hambric, Stephen A., Shung H. Sung, and Donald J. Nefske. Engineering Vibroacoustic Analysis: Methods and Applications. Wiley & Sons, Incorporated, John, 2016.

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Hambric, Stephen A., Shung H. Sung, and Donald J. Nefske. Engineering Vibroacoustic Analysis: Methods and Applications. Wiley & Sons, Limited, John, 2016.

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Vibroacoustic Simulation: An Introduction to Statistical Energy Analysis and Hybrid Methods. Wiley & Sons, Limited, John, 2022.

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Peiffer, Alexander. Vibroacoustic Simulation: An Introduction to Statistical Energy Analysis and Hybrid Methods. Wiley & Sons, Incorporated, John, 2022.

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Peiffer, Alexander. Vibroacoustic Simulation: An Introduction to Statistical Energy Analysis and Hybrid Methods. Wiley & Sons, Incorporated, John, 2022.

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Peiffer, Alexander. Vibroacoustic Simulation: An Introduction to Statistical Energy Analysis and Hybrid Methods. Wiley & Sons, Incorporated, John, 2022.

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Book chapters on the topic "Vibroacoustic Analysis"

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Mansouri, M., B. Radi, and A. El Hami. "Vibroacoustic Analysis of Boat Propeller Using Reliability Techniques." In Lecture Notes in Mechanical Engineering, 315–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37143-1_38.

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Dobbler, Klaus, Moritz Fišer, Maria Fellner, and Bernhard Rettenbacher. "Vibroacoustic Monitoring: Techniques for Human Gait Analysis in Smart Homes." In Ambient Assisted Living, 47–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37988-8_4.

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Khusainov, R. M., P. N. Krestyaninov, and D. D. Safin. "Experimental Optimization of Cutting Modes for Milling Based on Vibroacoustic Analysis." In Proceedings of the 4th International Conference on Industrial Engineering, 1483–89. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95630-5_158.

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Banaszak, Szymon, and Eugeniusz Kornatowski. "Transformer Windings Diagnostics with Combined Frequency Response Analysis and Vibroacoustic Methods." In Advances in Intelligent Systems and Computing, 463–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-39881-0_39.

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Collet, M., M. Ouisse, K. A. Cunefare, M. Ruzzene, B. Beck, L. Airoldi, and F. Casadei. "Vibroacoustic Energy Diffusion Optimization in Beams and Plates by Means of Distributed Shunted Piezoelectric Patches." In Vibration and Structural Acoustics Analysis, 265–302. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1703-9_10.

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Nowicki, Ryszard, Roman Słowiński, and Jerzy Stefanowski. "Analysis of Diagnostic Symptoms in Vibroacoustic Diagnostics by Means of the Rough Sets Theory." In Intelligent Decision Support, 33–48. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-7975-9_3.

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Pandey, Avnish Mahendra, and K. V. Nagendra Gopal. "Vibroacoustic analysis of simply supported and clamped functionally graded sandwich plates under transient loading." In Aerospace and Associated Technology, 146–52. London: Routledge, 2022. http://dx.doi.org/10.1201/9781003324539-26.

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Larbi, W. "Vibroacoustic behavior of a laminated plate with frequency dependent viscoelastic core: Finite element and experimental analysis." In Insights and Innovations in Structural Engineering, Mechanics and Computation, 884–89. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-146.

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Klekot, Grzegorz, and Michał Michalik. "An Analysis of a Possibility to Use Vibroacoustic Methods for the Diagnosis of the Sleep Apnea Syndrome." In Applied Condition Monitoring, 477–85. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62042-8_43.

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Bucur, Paul A., Klaus Frick, and Philipp Hungerländer. "Correlation Analysis Between the Vibroacoustic Behavior of Steering Gear and Ball Nut Assemblies in the Automotive Industry." In EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization, 1253–62. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97773-7_108.

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Conference papers on the topic "Vibroacoustic Analysis"

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Bentow, B., J. Betser, J. Dodge, A. Homer, C. D. Moore, R. M. Keller, M. Presley, R. Davis, J. Seidel, and C. Lee. "Grid-enabling a vibroacoustic analysis application." In 6th IEEE/ACM International Workshop on Grid Computing. IEEE, 2005. http://dx.doi.org/10.1109/grid.2005.1542721.

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Paucar Casas, Walter Jesus, Leandro Pavan, Luis Roberto Centeno Drehmer, and Venâncio Lázaro Batalhone Neto. "Modal Analysis of a Vibroacoustic Cabin." In SAE Brasil Noise and Vibration Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2008. http://dx.doi.org/10.4271/2008-36-0586.

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Radkowski, Stanisław, and Robert Gumiński. "Energy of Vibroacoustic Signal as Parameter of Logistics Model of the Tooth’s Crack Development." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82595.

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The paper takes on the issue of uncertainty in statistical methods of cracks propagation. The goal of the paper was to develop a method, which would enable use of diagnostic information in assessment of fatigue damage process. Particular attention was paid to the possibility of forecasting the occurrence of damage due to fatigue while relying on the analysis of the structure of a vibroacoustic signal. The difficulty in this case is that the set of parameters containing diagnostic information may change as defects develop. This fact confirms the necessity of examining the evolution of probability distribution and defining the periods of an object’s operation, carried out while taking into account the actual technical condition as well as the associated identification of defect development phases. The study presents the following issue: developing the method of diagnosing the early stages of defect development while analyzing energy of vibroacoustics signal as parameter of logistics model of cracks development.
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Tadayon, M. A., S. S. Ziaee Tabatabaie, and A. A. Eftekharian. "Vibroacoustic Analysis of the Switch Reluctance Motor." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41968.

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One of the most important types of electromechanical systems is the Switch Reluctance Motors/Machines (SRM) which is attracting considerable interest in industry. In SRM generally there are a lot of disorders and noises due to big vibratory radial loads, such as acoustic noises. In order to prevent these disturbances and decrease environmental noise pollutions, it is very necessary to study them carefully. To reach this purpose in this work first, radial loads of the SRM are investigated and then modal analysis is performed to obtain natural frequencies and mode shapes of the whole system. After that, harmonic analysis of the system is carried out and with the use of these analyses acoustic disorders of the SRM system is obtained. At the end, we investigate the effects of the variation of the end shield in these systems. The results of this work can serve as a guide to the industrial application of SRM, particularly in design of end shields (for all kind of motor with high radial force).
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Vladimirovich, Klychnikov Vladimir, Lapin Dmitriy Vladimirovich, and Mark Eduardovich Hubbatulin. "Analysis of methods of non-invasive vibroacoustic diagnostics." In XLIV ACADEMIC SPACE CONFERENCE: dedicated to the memory of academician S.P. Korolev and other outstanding Russian scientists – Pioneers of space exploration. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0035941.

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Bernasconi, Giancarlo, Silvio Del Giudice, Giuseppe Giunta, and Francesco Dionigi. "Advanced Pipeline Vibroacoustic Monitoring." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97281.

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Remote real-time monitoring of pipelines reliability is becoming a key factor for the environmental sustainability of oil&gas industry. Multipoint Acoustic Sensing (MAS) technology makes use of multi sensors placed at discrete distances to detect Third Party Interference (TPI) and fluid leaks along the pipeline. In fact, any interaction with the pipe generates pressure waves that are guided within the fluid (gas or oil) for long distances, carrying information on the source event. Pressure propagation is mainly governed by the absorption coefficient and the sound speed. These parameters are in turn complicated functions of the frequency, the geometrical and elastic parameters of the pipe shell, the elastic parameters of the surrounding medium, and the acoustic and thermodynamic properties of the transported fluid. We have analyzed these aspects while processing acoustic data collected on crude oil and gas transportation pipelines, in different operational and flow conditions. This study describes the acquisition campaigns and the data analysis steps used for the experimental derivation of fluid properties and pipe anomalies. The results are also used for the validation of mathematical models of pressure waves propagation in fluid filled pipes.
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Alia, Ahlem. "Simulation of Vibroacoustic Problem Using Coupled FE/FE Formulation and Modal Analysis." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2865.

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Vibroacoustic consists of the interaction between elastic and acoustic waves. This interaction causes the acoustic pressure to exert a force to the structure and the structural motion produces an effective fluid load. Hence, studying vibroacoustic problems requires that both elastic structure and fluid to be modeled. In this paper, a simple vibroacoustic problem is modeled by a coupled FE/FE modal analysis method in which a lumped mass representation is considered. The numerical results are represented for an elastic plate backed cavity. In this method, the coupling system is projected on some structural modes in vacuum and some rigid cavity modes. The obtained system is put in a diagonal form by solving left and right eigenvalues problem. Some results are presented to illustrate the effect of the modal analysis and the lumped mass formulation. Some numerical results were compared to analytical solutions.
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Bennighof, Jeffrey. "Vibroacoustic frequency sweep analysis using automated multi-level substructuring." In 40th Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-1240.

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Bentow, B., J. Dodge, A. Homer, C. D. Moore, R. M. Keller, M. Presley, R. Davis, J. Seidel, C. Lee, and J. Betser. "System Management for Grid-Enabling a Vibroacoustic Analysis Application." In 2006 IEEE/IFIP Network Operations and Management Symposium NOMS 2006. IEEE, 2006. http://dx.doi.org/10.1109/noms.2006.1687615.

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Cohan, Lucy E., and David W. Miller. "Vibroacoustic analysis and optimization of lightweight silicon carbide mirrors." In SPIE Optical Engineering + Applications, edited by Howard A. MacEwen and James B. Breckinridge. SPIE, 2009. http://dx.doi.org/10.1117/12.824739.

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