Relevant bibliographies by topics / Acoustic finite element model

Academic literature on the topic 'Acoustic finite element model'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Acoustic finite element model"

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Shi, Wen Ku, Guang Ming Wu, Zhi Yong Chen, and Nian Cheng Guo. "Prediction and Analysis of Vehicle Cab Interior Noise Based on Structure-Acoustic Coupling." Advanced Materials Research 424-425 (January 2012): 637–40. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.637.

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To study the vibration characteristics of the vehicle’s cab, finite element model of the cab was established and structural modal analysis was made. According to the internal structure of the cab, acoustic finite element modal of the cab including the seats was built and cavity acoustics modal analysis was carried out. Based on the structural modal and acoustic model of the cab, the coupled acoustic-structure model was carried. The acoustic response of the cab was calculated by mode-superposition
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Wu, S. W., S. H. Lian, and L. H. Hsu. "A FINITE ELEMENT MODEL FOR ACOUSTIC RADIATION." Journal of Sound and Vibration 215, no. 3 (August 1998): 489–98. http://dx.doi.org/10.1006/jsvi.1998.1664.

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MAR-OR, ASSAF, and DAN GIVOLI. "A FINITE ELEMENT STRUCTURAL-ACOUSTIC MODEL OF COUPLED MEMBRANES." Journal of Computational Acoustics 12, no. 04 (December 2004): 605–18. http://dx.doi.org/10.1142/s0218396x04002407.

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A simple model displaying structural-acoustic behavior is considered. The model comprises of two parallel infinitely-long flat membranes lying on elastic foundations and the acoustic medium separating them. The structural-acoustic coupling manifests itself in that a vibrational excitation of one of the membranes triggers vibrations in the other. The governing equations are stated, and the associated finite element formulation is constructed. The model is then analyzed numerically and its vibrational properties are investigated. The proposed model is especially simple, being two-dimensional and involving a small number of parameters, but at the same time it brings to light some important features associated with structural-acoustic coupling. Therefore it may serve as a benchmark for evaluating structural-acoustic numerical schemes and as an educational tool for studying structural-acoustic coupling in a simple context.
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Wan, Zhimin, Ting Wang, Qibai Huang, and Jianliang Wang. "Acoustic finite element model updating using acoustic frequency response function." Finite Elements in Analysis and Design 87 (September 2014): 1–9. http://dx.doi.org/10.1016/j.finel.2014.04.007.

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LISTERUD, EIVIND, and WALTER EVERSMAN. "FINITE ELEMENT MODELING OF ACOUSTICS USING HIGHER ORDER ELEMENTS PART II: TURBOFAN ACOUSTIC RADIATION." Journal of Computational Acoustics 12, no. 03 (September 2004): 431–46. http://dx.doi.org/10.1142/s0218396x04002353.

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A study is made of computational accuracy and efficiency for finite element modeling of acoustic radiation in a nonuniform moving medium. For a given level of accuracy for acoustic pressure, cubic serendipity elements are shown to require a less dense mesh than quadratic elements. These elements have been applied to the near field of inlet and aft acoustic radiation models for a turbofan engine and they yield considerable reduction in the dimensionality of the problem without sacrificing accuracy. The results show that for computation of acoustic pressure the cubic element formulation model is superior to the quadratic. Performance gains in computation of acoustic potential are not as significant. In the external radiated field, improved convergence using cubic serendipity elements is shown by comparison of contours of constant pressure magnitude.
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Murphy, Joseph E., and Stanley A. Chin-Bing. "A finite element model for ocean acoustic propagation." Mathematical and Computer Modelling 11 (1988): 70–74. http://dx.doi.org/10.1016/0895-7177(88)90457-8.

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LISTERUD, EIVIND, and WALTER EVERSMAN. "FINITE ELEMENT MODELING OF ACOUSTICS USING HIGHER ORDER ELEMENTS PART I: NONUNIFORM DUCT PROPAGATION." Journal of Computational Acoustics 12, no. 03 (September 2004): 397–429. http://dx.doi.org/10.1142/s0218396x0400233x.

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Cubic serendipity elements have been implemented into a nonuniform duct model of acoustic propagation in a moving medium. This model uses a convective potential formulation derived from the inviscid linearized mass and momentum equations. The model requires post-processing to calculate acoustic pressure. These elements outperform the quadratic serendipity elements in terms of computational efficiency based on visual observations and error norm analysis of acoustic pressure. CPU time reduction of up to 40% has been observed without sacrificing accuracy. Any penalty in numerical accuracy incurred by using serendipity elements rather than Lagrangian elements is far outweighed by the gains in dimensionality. The computational gains for calculation of acoustic potential are considerably less. Analytical expressions for the modal and convective effects on the propagating wavelength have been formulated and compared to numerical results. Preliminary assessment of alternative finite element approaches to model the convective potential formulation has been conducted. Stabilization and wave approximation methods have been implemented to solve simple one-dimensional problems.
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Hou, Wei Ling, Hong Zhou, and Si Le Wang. "Acoustic Modal Test and Finite Element Analysis on Vehicle Cavity." Applied Mechanics and Materials 239-240 (December 2012): 32–36. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.32.

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A cavity acoustic modal of a medium-sized commercial vehicle was tested and analyzed based on LMS Test.Lab modal analysis system. Acoustic modal characteristics, including modal frequencies and modal shapes of the cavity, were obtained. By comparing the results of acoustic modal frequencies to the structure modal ones, the acoustic-structure coupling at critical frequencies could be avoided and the noise in low frequency range could be reduced. Meanwhile, the simulation of the acoustic modal is analyzed by establishing the finite element model of the cavity, which may be a reference to improve the interior acoustic properties of the cavity.
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Danda Roy, I., and W. Eversman. "Improved Finite Element Modeling of the Turbofan Engine Inlet Radiation Problem." Journal of Vibration and Acoustics 117, no. 1 (January 1, 1995): 109–15. http://dx.doi.org/10.1115/1.2873853.

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Improvements have been made in the finite element model of the acoustic radiated field from a turbofan engine inlet in the presence of a mean flow. The problem of acoustic radiation from a turbofan engine inlet is difficult to model numerically because of the large domain and high frequencies involved. A numerical model with conventional finite elements in the near field and wave envelope elements in the far field has been constructed. By employing an irrotational mean flow assumption, both the mean flow and the acoustic perturbation problem have been posed in an axisymmetric formulation in terms of the velocity potential, thereby minimizing computer storage and time requirements. The finite element mesh has been altered in search of an improved solution. The mean flow problem has been reformulated with new boundary conditions to make it theoretically rigorous. The sound source at the fan face has been modeled as a combination of positive and negative propagating duct eigenfunctions. Therefore, a finite element duct eigenvalue problem has been solved on the fan face and the resulting modal matrix has been used to implement a source boundary condition on the fan face in the acoustic radiation problem. In the post processing of the solution, the acoustic pressure has been evaluated at Gauss points inside the elements and the nodal pressure values have been interpolated from them. This has significantly improved the results. The effect of the geometric position of the transition circle between conventional finite elements and wave envelope elements has been studied and it has been found that the transition can be made nearer to the inlet than previously assumed.
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Kaselouris, Evaggelos, Chrysoula Alexandraki, Yannis Orphanos, Makis Bakarezos, Michael Tatarakis, Nektarios A. Papadogiannis, and Vasilis Dimitriou. "Acoustic analysis of impact sound on vibrating circular membranes." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (August 1, 2021): 3378–85. http://dx.doi.org/10.3397/in-2021-2389.

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A finite element method (FEM) - boundary element method (BEM) model is developed to compute the sound generated by of a force acting on a circular membrane (drumhead). A vibro-acoustic analysis that combines modal FEM analysis, a FEM steady state dynamic analysis (SSD), considering harmonic loading and boundary element acoustics, is performed. The drumhead vibrates due to the force impact and the sound is emitted in the air. The vibration of structural response is initially computed, and the obtained results are set to be the boundary conditions of the acoustic analysis in the vibro-acoustic simulation. The radiated sound can be computed at any point of the solution domain. Various materials used by drumhead manufacturers are tested and a parametric analysis focusing on the mesh density of the models is presented. The impact sound and the acoustical characteristics of the simulated test cases are evaluated. The Rayleigh method is also applied to the acoustic simulations and is further compared to the BEM simulation results. The outcomes of this study may be further used as reverse engineering inputs, to machine learning models for the estimation of the physical and mechanical parameters of drumheads from audio signals.
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Dissertations / Theses on the topic "Acoustic finite element model"

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Hamiche, Karim. "A high-order finite element model for acoustic propagation." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/400677/.

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Sound propagation in complex non-uniform mean flows is an important research area for transport, building and power generation industries. Unsteady flows are responsible for noise generation in rotating and pulsating machines. Sound propagates in ducts and radiates through their openings. Duct discontinuities and complex flow effects on acoustic propagation need to be investigated. Although it provides accurate results, the most commonly used Computational AeroAcoustics propagation method, the full potential theory, does not describe the whole physics. Turbofan exhaust noise radiation involves strong refraction of the sound field occurring through jet shear layer, as well as interaction between the acoustic field and the vorticity/entropy waves. The Linearised Euler Equations are able to represent these effects. Solving these equations with time-domain solvers presents shortcomings such as linear instabilities and impedance modelling, which can be avoided by solving in the frequency domain. Nevertheless the classical Finite Element Method in frequency domain suffers from dispersion error and high memory requirements. These drawbacks are particularly critical at high frequencies and with the Linearised Euler Equations, which involve up to five unknowns. To circumvent these obstacles a novel approach is developed in this thesis, using a high-order Finite Element Method to solve the Linearised Euler Equations in the frequency domain. The model involves high-order polynomial shape functions with unstructured triangular meshes, numerical stabilisation and Perfectly Matched Layers. The computational effort is further optimised by coupling the Linearised Euler Equations in the regions of complex sheared mean flow with the Linearised Potential Equation in the regions of irrotational mean flow. The numerical model is applied to aeroengine acoustic propagation either by an intake or by an exhaust. Comparisons with analytic solutions demonstrate the method accuracy which properly represents the acoustic and vorticity waves, as well as the refraction of the sound field across the jet shear layer. The benefits in terms of memory requirements and computation time are significant in comparison to the standard low-order Finite Element Method, even more so with the coupling technique.
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Bolmsvik, Åsa. "Structural-acoustic vibrations in wooden assemblies: : Experimental modal analysis and finite element modelling." Doctoral thesis, Linnéuniversitetet, Institutionen för bygg- och energiteknik (BE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-24562.

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This doctoral thesis concerns flanking transmission in light weight, wooden multi-storey buildings within the low frequency, primarily 20-120 Hz. The overall aim is to investigate how the finite element method can contribute in the design phase to evaluate different junctions regarding flanking transmission. Two field measurements of accelerations in light weight wooden buildings have been evaluated. In these, two sources; a stepping machine, and an electrodynamic shaker, were used. The shaker was shown to give more detailed information. However, since a light weight structure in field exhibit energy losses to surrounding building parts, reliable damping estimates were difficult to obtain. In addition, two laboratory measurements were made. These were evaluated using experimental modal analysis, giving the eigenmodes and the damping of the structures. The damping for these particular structures varies significantly with frequency, especially when an elastomer is used in the floor-wall junction. The overall damping is also higher when elastomers are used in the floor-wall junction in comparison to a screwed junction. By analysing the eigenmodes, using the modal assurance criterion, of the same structure with two types of junctions it was concluded that the modes become significantly different. Thereby the overall behavior differs. Several finite element models representing both the field and laboratory test setups have been made. The junctions between the building blocks in the models have been modeled using tie or springs and dashpots. Visual observation and the modal assurance criterion show that there is more rotational stiffness in the test structures than in the models. The findings in this doctoral thesis add understanding to how modern joints in wooden constructions can be represented by FE modelling. They will contribute in developing FE models that can be used to see the acoustic effects prior to building an entire house. However, further research is still needed.
Denna doktorsavhandling behandlar flanktransmission i flervåningshus med trästomme, inom det lågfrekventa området, främst 20-120 Hz. Det övergripande målet är att undersöka hur finita elementmetoden kan bidra i konstruktionsfasen för att utvärdera olika knutpunkters inverkan på flanktransmissionen. Två fältmätningar av accelerationer i trähus har utvärderats. I dessa har två olika lastkällor använts, i den första en stegljudsapparat och i den andra en elektrodynamisk vibrator (shaker). Det visades att shakern kan ge mer detaljerad information, men eftersom vibrationerna även sprider sig till omgivande byggnadsdelar vid fältmätningarna var det svårt att estimera tillförlitliga dämpningsdata även då shaker användes. Fältmätningarna följdes av två mätningar i laborationsmiljö. Dessa två experiment utvärderades med experimentell modalanalys, vilket ger egenmoder och dämpning hos strukturerna. Dämpningen för dessa trähuskonstruktioner varierar kraftigt med frekvens. Extra stora variationer registreras då en elastomer användes i knutpunkten mellan golv och vägg. Den totala dämpningen är generellt högre när elastomerer används i knutpunkten mellan golv och vägg i jämförelse med då knutpunkten är skruvad. Genom att analysera egenmoder och deras korrelationer (MAC), för samma trästruktur men med olika typer av knutpunkter, drogs slutsatsen att knutpunkten drastiskt förändrar strukturens dynamiska beteende. Flera finita elementmodeller av både fält- och laboratorieuppställningar har gjorts. I dessa har knutpunkterna mellan byggnadsdelar modellerats helt styvt eller med hjälp av fjädrar och dämpare. Visuella observationer av egenmoder och korrelationen dem emellan visar att det finns mer rotationsstyvhet i försöken än i finita elementmodellerna. Resultaten i denna doktorsavhandling har gett förståelse för hur knutpunkter i träkonstruktioner beter sig och kan simuleras med finit elementmodellering. Vidare kan resultaten bidra till utvecklingen av FE-modeller som kan användas för att kunna se de akustiska effekterna redan under konstruktionsstadiet. Dock behövs ytterligare forskning inom området.
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Rumpler, Romain. "Efficient finite element approach for structural-acoustic applicationns including 3D modelling of sound absorbing porous materials." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2012. http://tel.archives-ouvertes.fr/tel-00726915.

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In the context of interior noise reduction, the present work aims at proposing Finite Element (FE) solution strategies for interior structural-acoustic applications including 3D modelling of homogeneous and isotropic poroelastic materials, under timeharmonic excitations, and in the low frequency range. A model based on the Biot-Allard theory is used for the poroelastic materials, which is known to be very costly in terms of computational resources. Reduced models offer the possibility to enhance the resolution of such complex problems. However, their applicability to porous materials remained to be demonstrated.First, this thesis presents FE resolutions of poro-elasto-acoustic coupled problems using modal-based approaches both for the acoustic and porous domains. The original modal approach proposed for porous media, together with a dedicated mode selection and truncation procedure, are validated on 1D to 3D applications.In a second part, modal-reduced models are combined with a Padé approximants reconstruction scheme in order to further improve the efficiency.A concluding chapter presents a comparison and a combination of the proposed methods on a 3D academic application, showing promising performances. Conclusions are then drawn to provide indications for future research and tests to be conducted in order to further enhance the methodologies proposed in this thesis.
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Hochman, Michael. "Investigation of acoustic crosstalk effects in CMUT arrays." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42782.

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Capacitive Micromachined Ultrasonic Transducers (CMUTs) have demonstrated significant potential to advance the state of medical ultrasound imaging beyond the capabilities of the currently employed piezoelectric technology. Because they rely on well-established micro-fabrication techniques, they can achieve complex geometries, densely populated arrays, and tight integration with electronics, all of which are required for advanced intravascular ultrasound (IVUS) applications such as high-frequency or forward-looking catheters. Moreover, they also offer higher bandwidth than their piezoelectric counterparts. Before CMUTs can be effectively used, they must be fully characterized and optimized through experimentation and modeling. Unfortunately, immersed transducer arrays are inherently difficult to simulate due to a phenomenon known as acoustic crosstalk, which refers to the fact that every membrane in an array affects the dynamic behavior of every other membrane in an array as their respective pressure fields interact with one another. In essence, it implies that modeling a single CMUT membrane is not sufficient; the entire array must be modeled for complete accuracy. Finite element models (FEMs) are the most accurate technique for simulating CMUT behavior, but they can become extremely large considering that most CMUT arrays contain hundreds of membranes. This thesis focuses on the development and application of a more efficient model for transducer arrays first introduced by Meynier et al. [1], which provides accuracy comparable to FEM, but with greatly decreased computation time. It models the stiffness of each membrane using a finite difference approximation of thin plate equations. This stiffness is incorporated into a force balance which accounts for effects from the electrostatic actuation, pressure forces from the fluid environment, mass and damping from the membrane, etc. For fluid coupling effects, a Boundary Element Matrix (BEM) is employed that is based on the Green's function for a baffled point source in a semi-infinite fluid. The BEM utilizes the nodal mesh created for the finite difference method, and relates the dynamic displacement of each node to the pressure at every node in the array. Use of the thin plate equations and the BEM implies that the entire CMUT array can be reduced to a 2D nodal mesh, allowing for a drastic improvement in computation time compared with FEM. After the model was developed, it was then validated through comparison with FEM. From these tests, it demonstrated a capability to accurately predict collapse voltage, center frequency, bandwidth, and pressure magnitudes to within 5% difference of FEM simulations. Further validation with experimental results revealed a close correlation with predicted impedance/admittance plots, radiation patterns, frequency responses, and noise current spectrums. More specifically, it accurately predicted how acoustic crosstalk would create sharp peaks and notches in the frequency responses, and enhance side lobes and nulls in the angular radiation pattern. Preliminary design studies with the model were also performed. They revealed that membranes with larger lateral dimensions effectively increased the bandwidth of isolated membranes. They also demonstrated potential for various crosstalk reduction techniques in array design such as disrupting array periodicity, optimizing inter-membrane pitch, and adjusting the number of membranes per element. It is expected that the model developed in this thesis will serve as a useful tool for future iterations of CMUT array optimizations.
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Rumpler, Romain. "Efficient Finite Element Approach for Structural-Acoustic Applications including 3D modelling of Sound Absorbing Porous Materials." Doctoral thesis, KTH, MWL Numerisk akustik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-90335.

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In the context of interior noise reduction, the present work aims at proposing Finite Element (FE) solution strategies for interior structural-acoustic applications including 3D modelling of homogeneous and isotropic poroelastic materials, under timeharmonic excitations, and in the low frequency range. A model based on the Biot-Allard theory is used for the poroelastic materials, which is known to be very costly in terms of computational resources. Reduced models offer the possibility to enhance the resolution of such complex problems. However, their applicability to porous materials remained to be demonstrated.First, this thesis presents FE resolutions of poro-elasto-acoustic coupled problems using modal-based approaches both for the acoustic and porous domains. The original modal approach proposed for porous media, together with a dedicated mode selection and truncation procedure, are validated on 1D to 3D applications.In a second part, modal-reduced models are combined with a Padé approximants reconstruction scheme in order to further improve the efficiency.A concluding chapter presents a comparison and a combination of the proposed methods on a 3D academic application, showing promising performances. Conclusions are then drawn to provide indications for future research and tests to be conducted in order to further enhance the methodologies proposed in this thesis.
Dans le contexte de lutte contre les nuisances sonores, cette thèse porte sur le développement de méthodes de résolution efficaces par éléments finis, pour des problèmes de vibroacoustique interne avec interfaces dissipatives, dans le domaine des basses fréquences. L’étude se limite à l’utilisation de solutions passives telles que l’intégration de matériaux poreux homogènes et isotropes, modélisés par une approche fondée sur la théorie de Biot-Allard. Ces modèles étant coûteux en terme de résolution, un des objectifs de cette thèse est de proposer une approche modale pour la réduction du problème poroélastique, bien que l’adéquation d’une telle approche avec le comportement dynamique des matériaux poreux soit à démontrer.Dans un premier temps, la résolution de problèmes couplés élasto-poro-acoustiques par sous-structuration dynamique des domaines acoustiques et poreux est établie. L’approche modale originale proposée pour les milieux poroélastiques, ainsi qu’une procédure de sélection des modes significatifs, sont validées sur des exemples 1D à 3D.Une deuxième partie présente une méthode combinant l’utilisation des modèles réduits précédemment établis avec une procédure d’approximation de solution par approximants de Padé. Il est montré qu’une telle combinaison offre la possibilité d’accroître les performances de la résolution (allocation mémoire et ressources en temps de calcul).Un chapitre dédié aux applications permet d’évaluer et comparer les approches sur un problème académique 3D, mettant en valeur leurs performances encourageantes. Afin d’améliorer les méthodes établies dans cette thèse, des perspectives à ces travaux de recherche sont apportées en conclusion.

QC 20120224


FP6 Marie-Curie Smart Structures
FP7 Marie-Curie Mid-Frequency
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Zhang, Nan. "SCALE MODELS OF ACOUSTIC SCATTERING PROBLEMS INCLUDING BARRIERS AND SOUND ABSORPTION." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/119.

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Scale modeling has been commonly used for architectural acoustics but use in other noise control areas is nominal. Acoustic scale modeling theory is first reviewed and then feasibility for small-scale applications, such as is common in the electronics industry, is investigated. Three application cases are used to examine the viability. In the first example, a scale model is used to determine the insertion loss of a rectangular barrier. In the second example, the transmission loss through parallel tubes drilled through a cylinder is measured and results are compared to a 2.85 times scale model with good agreement. The third example is a rectangular cuboid with a smaller cylindrical well bored into it. A point source is placed above the cuboid. The transfer function was measured between positions on the top of the cylinder and inside of the cylindrical well. Treatments were then applied sequentially including a cylindrical barrier around the well, a membrane cover over the opening, and a layer of sound absorption over the well. Results are compared between the full scale and a 5.7 times scale model and correlation between the two is satisfactory.
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Remillieux, Marcel C. "Development of a Model for Predicting the Transmission of Sonic Booms into Buildings at Low Frequency." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/27543.

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Recent progresses by the aircraft industry in the development of a quieter supersonic transport have opened the possibility of overland supersonic flights, which are currently banned by aviation authorities in most countries. For the ban to be lifted, the sonic booms the aircraft generate at supersonic speed must be acceptable from a human-perception point of view, in particular inside buildings. The problem of the transmission of sonic booms inside buildings can be divided in several aspects such as the external pressure loading, structure vibration, and interior acoustic response. Past investigations on this problem have tackled all these aspects but were limited to simple structures and often did not account for the coupled fluid-structure interaction. A more comprehensive work that includes all the effects of sonic booms to ultimately predict the noise exposure inside realistic building structures, e.g. residential houses, has never been reported. Thus far, these effects could only be investigated experimentally, e.g. flight tests. In this research, a numerical model and a computer code are developed within the above context to predict the vibro-acoustic response of simplified building structures exposed to sonic booms, at low frequency. The model is applicable to structures with multiple rectangular cavities, isolated or interconnected with openings. The response of the fluid-structure system, including their fully coupled interaction, is computed in the time domain using a modal-decomposition approach for both the structural and acoustic systems. In the dynamic equations, the structural displacement is expressed in terms of summations over the â in vacuoâ normal modes of vibration. The interior pressure is expressed in terms of summations over the acoustic modes of the rooms with perfectly reflecting surfaces (hard walls). This approach is simple to implement and computationally efficient at low frequency, when the modal density is relatively low. The numerical model is designed specifically for this application and includes several novel formulations. Firstly, a new shell finite-element is derived to model the structural components typically used in building construction that have orthotropic characteristics such as plaster-wood walls, floors, and siding panels. The constitutive matrix for these types of components is formulated using simple analytical expressions based on the orthotropic constants of an equivalent orthotropic plate. This approach is computationally efficient since there is no need to model all the individual subcomponents of the assembly (studs, sheathing, etc.) and their interconnections. Secondly, a dedicated finite-element module is developed that implements the new shell element for orthotropic components as well as a conventional shell element for isotropic components, e.g. window panels and doors. The finite element module computes the â in vacuoâ structural modes of vibration. The modes and external pressure distribution are then used to compute modal loads. This dedicated finite-element module has the main advantage of overcoming the need, and subsequent complications, for using a large commercial finite-element program. Lastly, a novel formulation is developed for the fully coupled fluid-structure model to handle room openings and compute the acoustic response of interconnected rooms. The formulation is based on the Helmholtz resonator approach and is applicable to the very low frequency-range, when the acoustic wavelength is much larger than the opening dimensions. Experimental validation of the numerical model and computer code is presented for three test cases of increasing complexity. The first test structure consists of a single plaster-wood wall backed by a rigid rectangular enclosure. The structure is excited by sonic booms generated with a speaker. The second test structure is a single room made of plaster-wood walls with two double-panel windows and a door. The third test structure consists of the first room to which a second room with a large window assembly was added. Several door configurations of the structure are tested to validate the formulation for room openings. This latter case is the most realistic one as it involves the interaction of several structural components with several interior cavities. For the last two test cases, sonic booms with realistic durations and amplitudes were generated using an explosive technique. Numerical predictions are compared to the experimental data for the three test cases and show a good overall agreement. Finally, results from a parametric study are presented for the case of the single wall backed by a rigid enclosure. The effects of sonic-boom shape, e.g. rise time and duration, and effects of the structure geometry on the fluid-structure response to sonic booms are investigated.
Ph. D.
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Day, Joseph L. "A modal approximation for the mutual radiation impedance for spherical sources and acoustic wave scattering using an improved ATILA Finite Element code." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA369783.

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Thesis (M.S. Engineering Acoustics) Naval Postgraduate School, September 1999.
"September 1999". Thesis advisor(s): Clyde L. Scandrett, Steven R. Baker. Includes bibliographical references (p. 83-84). Also avaliable online.
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Case, Justin J. "Numerical analysis of the vibration and acoustic characteristics of large power transformers." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/103702/1/Justin_Case_Thesis.pdf.

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This thesis presents a numerical methodology to predict the noise and vibration characteristics of large power transformers. The approach, which focuses on a vibro-acoustic finite element simulation, has been validated by appropriate experimental measurements and is shown to identify both the local and global acoustic behaviour of a transformer under nominal operating conditions. Furthermore, analysis methods presented in this thesis have illustrated a transformer's complex vibration characteristics that result in elevated noise levels. An understanding of such vibration characteristics together with acoustic predictions will better enable transformer manufacturers to consistently meet noise emission targets set by customers and regulators.
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Mitchell, Morgan Adrienne. "Passive Noise Control in Incubators." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51603.

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Incubators in the Neonatal Intensive Care Unit (NICU) are known to produce high Sound Pressure Levels (SPL) that can have detrimental effects on infants. Currently measured SPL in NICU's using traditional incubators are above the recommended 45 dB[A] threshold value [1]. Due to operating equipment and environmental noise, the sound level that is perceived by the developing newborn can cause both short and long term hearing loss as well as psychological damage [1].This thesis presents a study on how passive noise control devices can be used to reduce SPL levels in incubator NICU environments. A combination of experimental testing coupled with Finite Element simulations were performed for a modern incubator. In the experimental portion, porous mattresses were analyzed to reduce SPL values. These same test scenarios were modeled using the FE software. Using this model, extensive studies were performed on an arrangement of porous mattress materials with simple foam shapes to determine sound absorbing characteristics of several designs. Data was collected and studied at a NICU at Children\'s Hospital in Norfolk, Va. Experimental work showed improvement in reducing SPL with multiple thicknesses for different sound absorbing mattresses. The experimental outcomes validated the FE simulation model by showing similar trends at the baby\'s ears. In simulation work, polyimide foam had the best low frequency performance while polyurethane had the greatest performance in middle and high frequencies. Designs that used full-width foam treatments across the incubator produced the overall greatest reduction in noise around the baby control volume by approximately 26%.
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Books on the topic "Acoustic finite element model"

1

Finite element analysis of acoustic scattering. New York: Springer, 1998.

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Vernon, Thomas A. Prediction of acoustic cavity modes by finite element methods. Dartmouth, N.S: Defence Research Establishment Atlantic, 1989.

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Baumeister, Kenneth J. A finite element model for wave propagation in an inhomogeneous [i.e. inhomogenous]. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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Ihlenburg, Frank, ed. Finite Element Analysis of Acoustic Scattering. New York: Springer-Verlag, 1998. http://dx.doi.org/10.1007/b98828.

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Baumeister, Kenneth J. Modal ring method for the scattering of sound. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1993.

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Friswell, M. I. Finite element model updating in structural dynamics. Dordrecht: Kluwer Academic Publishers, 1995.

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E, Mottershead J., ed. Finite Element Model Updating in Structural Dynamics. Dordrecht: Springer Netherlands, 1995.

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Friswell, M. I., and J. E. Mottershead. Finite Element Model Updating in Structural Dynamics. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8508-8.

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Rigby, G. L. A finite element model for creep in titanium. Pinawa, Man: AECL, Whiteshell Laboratories, 1995.

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Marwala, Tshilidzi. Finite-element-model Updating Using Computional Intelligence Techniques. London: Springer London, 2010. http://dx.doi.org/10.1007/978-1-84996-323-7.

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Book chapters on the topic "Acoustic finite element model"

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Murphy, Joseph E., and Stanley A. Chin-Bing. "A Seismo-Acoustic Finite Element Model for Underwater Acoustic Propagation." In Shear Waves in Marine Sediments, 463–70. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3568-9_53.

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Larbi, Walid, Jean-François Deü, and Roger Ohayon. "Vibro-Acoustic Analysis of Laminated Double-Wall: Finite Element Formulation and Reduced-Order Model." In Applied Condition Monitoring, 349–58. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14532-7_36.

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Kriščiūnas, Andrius, Rimantas Barauskas, Liudas Mažeika, and Tautvydas Fyleris. "Minimization of Numerical Dispersion Errors in 2D Finite Element Models of Short Acoustic Wave Propagation." In Communications in Computer and Information Science, 745–52. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46254-7_60.

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Oliveira, S. P. "On Multiple Modes of Propagation of High-Order Finite Element Methods for the Acoustic Wave Equation." In Lecture Notes in Computational Science and Engineering, 509–18. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65870-4_36.

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Couch, Ronald N., Eliott J. Radcliffe, and Rickey A. Caldwell. "A Novel Method to Correlate a Rocket Launcher Finite Element Model Using Experimental Modal Test Measurements and Identification Algorithms." In Shock & Vibration, Aircraft/Aerospace, Energy Harvesting, Acoustics & Optics, Volume 9, 153–66. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30087-0_14.

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Heidemann, Lucas, Jochen Scheck, and Berndt Zeitler. "Impact Sound Insulation of Thermally Insulated Balconies." In iCity. Transformative Research for the Livable, Intelligent, and Sustainable City, 359–71. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92096-8_23.

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AbstractWith the increasing urban densification, balconies are gaining in popularity as they improve the living quality in homes. From a technical point of view, the thermal insulation between balconies and the building’s façade is state of the art. In Germany, the most popular balcony construction is a reinforced concrete balcony, separated from the building by a thermal insulation element (TIE), which is meant to reduce the thermal energy loss and thus ensure the sustainability of intelligent buildings. The impact sound transmission from balconies, however, is a problem that has not been addressed enough to date. The paper is based on a project of the same name within the iCity research with the main goal of providing acoustic quantities, e.g. an impact sound pressure level difference, for a TIE that can be used to compare the acoustical quality of products and used to predict the impact sound pressure levels within the building using the standard EN ISO 12354-2. Experimental and numerical studies have been carried out on various ceiling-balcony mock-ups without and with TIEs, e.g. by means of experimental modal analysis and validated finite element models, respectively. These studies showed that even doubling the width of the ceiling-balcony mock-up does not change the results significantly, suggesting that the proposed test set-up is suitable for standard testing. The analysis method and results presented here are for only one test set-up with and without a TIE that underwent constructive modifications during the tests. The selected TIE shows an effective sound insulation above 400 Hz and achieves a single-number rated impact sound level difference of $$ \Delta {L}_{\mathrm{w}}^{\ast}\approx 10\ \mathrm{dB} $$ Δ L w ∗ ≈ 10 dB .
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Craggs, A. "Acoustic Modeling: Finite Element Method." In Encyclopedia of Acoustics, 165–72. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470172513.ch14.

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Qu, Zu-Qing. "Finite Element Modeling." In Model Order Reduction Techniques, 13–30. London: Springer London, 2004. http://dx.doi.org/10.1007/978-1-4471-3827-3_2.

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Avitabile, Peter, and Michael Mains. "Finite Element Model Correlation." In Handbook of Experimental Structural Dynamics, 857–95. New York, NY: Springer New York, 2022. http://dx.doi.org/10.1007/978-1-4614-4547-0_17.

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Avitabile, Peter, and Michael Mains. "Finite Element Model Correlation." In Handbook of Experimental Structural Dynamics, 1–39. New York, NY: Springer New York, 2020. http://dx.doi.org/10.1007/978-1-4939-6503-8_17-1.

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Conference papers on the topic "Acoustic finite element model"

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Lee, Sangyun, Kwangseo Park, Shung H. Sung, and Donald J. Nefske. "Validation of an Acoustic Finite Element Model of an Automobile Passenger Compartment." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10843.

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An acoustic finite-element model of an automobile passenger compartment that represents the more complicated vehicle interior acoustic characteristics is developed and experimentally assessed using loudspeaker excitation. The acoustic finite-element model represents the passenger compartment cavity, trunk compartment cavity, front and rear seats, parcel shelf, door volumes, and IP (Instrument Panel) volume. The model accounts for the coupling between the compartment cavity and trunk cavity through the rear seat and parcel shelf, and the coupling between the compartment cavity and the door and IP panel volumes. Modal analysis tests of a vehicle were conducted using loudspeaker excitation to identify the compartment cavity modes and sound pressure response at a large number of interior locations. Comparisons of the predicted versus measured mode frequencies, mode shapes, and sound pressure response at the occupant ear locations are made to assess the accuracy of the model to 400 Hz.
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Yakimenko, Yurii, Andrii Zazerin, Anatolii Orlov, and Oleksandr Bogdan. "Film bulk acoustic resonator finite element model in active filter design." In 2014 37th ISSE International Spring Seminar in Electronics Technology (ISSE). IEEE, 2014. http://dx.doi.org/10.1109/isse.2014.6887649.

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Coyette, Jean-Pierre. "Application of Finite Element and Boundary Element Models to Transient Acoustic Problems." In International Conference On Vehicle Structural Mechanics & Cae. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/951088.

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Oude Nijhuis, Marco H. H., and Andre de Boer. "Finite element models applied in active structural acoustic control." In SPIE's 9th Annual International Symposium on Smart Structures and Materials, edited by Vittal S. Rao. SPIE, 2002. http://dx.doi.org/10.1117/12.475252.

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Miller, M., S. Ophem, E. Deckers, and W. Desmet. "Model Order Reduced Transient Acoustic Finite Element Simulations with Impedance Boundary Conditions." In 14th WCCM-ECCOMAS Congress. CIMNE, 2021. http://dx.doi.org/10.23967/wccm-eccomas.2020.203.

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Lei, Yu, Yadi Zhang, Houxing Lin, Xu Yang, and Minghao Wang. "Prediction Accuracy of the Human and Seat Model for Vehicle Acoustic Finite Element Model." In 2020 8th International Conference on Power Electronics Systems and Applications (PESA). IEEE, 2020. http://dx.doi.org/10.1109/pesa50370.2020.9344023.

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Sung, Shung H., and Donald J. Nefske. "Transfer Path Analysis of Body Panel Participation Using a Structural-Acoustic Finite Element Model." In ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ncad2012-1016.

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In transportation vehicles under operating conditions, interior noise frequently results from forces transmitted through the vehicle structure that excite body panel vibrations that couple with the body modes to radiate noise to the interior. The body panel participations to the interior noise that result from the force transfer paths can be identified using acoustic and structural-acoustic finite element models of the vehicle. This paper describes the transfer path analysis method to identify the body panel and modal participations for prescribed forcing excitations to the vehicle and to evaluate the effect of structural modifications. The theoretical development of the structural-acoustic finite element method and its example applications to two automotive vehicles are presented.
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Chen, Shuming, Dengzhi Peng, and Dengfeng Wang. "Computational Accuracy and Efficiency of the Element Types and Sizes for Car Acoustic Finite Element Model." In SAE 2014 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2014. http://dx.doi.org/10.4271/2014-01-0890.

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Harari, Isaac, and Gabriel Blejer. "Finite Element Methods for the Interaction of Acoustic Fluids With Elastic Solids." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0394.

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Abstract Computation is essential to the solution of many problems of structural acoustics, particularly when wavelengths are of the same order as characteristic length scales. The development of finite element methods for large-scale computation of solutions to these problems should be preceded by a thorough analytical understanding of their performance in simplified settings in order to validate application to general configurations. Coupling such an analysis with the design of numerical methods that is based on understanding the underlying mathematical framework leads to the development of robust methods in which stability properties are enhanced while maintaining higher-order accuracy. In this work we develop finite element methods for exterior problems of time-harmonic acoustic-structure interaction. Exterior boundary conditions are derived from an exact relation between the solution and its derivatives on an artificial boundary by the DtN method, yielding an equivalent problem in a bounded region that is suitable for domain-based computation. Solutions to the equivalent problem are unique, precluding singular behavior in finite element models. Galerkin/least-squares technology is specialized to these problems in order to counter the numerical difficulties that result from employing traditional Galerkin methods. This is achieved by appending terms in least-squares form containing residuals of the Euler-Lagrange equations to the standard Galerkin formulation. The Galerkin/least-squares method is designed to yield dispersion-free finite element solutions to model problems, leading to superior performance on general, multi-dimensional configurations. Two one-dimensional model problems are investigated over a wide range of combinations of material properties of both media. In the first an exterior acoustic problem with impedance boundary conditions is analyzed, in order to study the influence of the elastic body on the acoustic medium. In the second, an elastic rod with an exterior acoustic medium is investigated in order to examine propagation from the solid to the fluid. The resulting method exhibits superior performance for fluid-solid interaction in multi-dimensional configurations. One version of the method offers particularly good representation of interface values.
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Dweib, Ahmed H. "Acoustic Fatigue Assessment of Piping System Components by Finite Element Analysis." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57371.

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High levels of acoustic energy can be produced at the downstream of pressure-reducing valves, pressure safety valves and control valves in piping systems. The presence of acoustic pressure waves and their coupling with the piping wall flexural modes of vibration can result in high levels of dynamic stresses, which cause acoustic fatigue failure at points of discontinuities on the pipe wall. This work presents a procedure for the assessment of the acoustic fatigue of different piping components by the application of finite element analysis. The piping system process data is used to generate the acoustic pressure and acoustic power spectrum at the downstream of the pressure-reducing valve. This acoustic power spectrum is taken to act at a finite element model of the piping system. Dynamic analysis, by use of power spectrum and harmonic analysis, is performed to obtain the response dynamic stresses, which are used for the fatigue evaluation of the piping component. The methodology presented can be applied during the engineering phase in the design and stress analysis of piping components in critical services subjected to acoustic fatigue as well as in the detailed evaluation of the different proposed acoustic fatigue design solutions.
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Reports on the topic "Acoustic finite element model"

1

Zak, Adam R. Generalized Finite Element Gap Model. Fort Belvoir, VA: Defense Technical Information Center, August 1991. http://dx.doi.org/10.21236/ada240559.

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Schoof, L. A., and V. R. Yarberry. EXODUS II: A finite element data model. Office of Scientific and Technical Information (OSTI), September 1994. http://dx.doi.org/10.2172/10102115.

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Chambers, R. S., T. R. Guess, and T. D. Hinnerichs. A phenomenological finite element model of stereolithography processing. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/212696.

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Chowdhury, Mostafiz R., Sharon Garner, Yazmin Seda-Sanabria, and Robert L. Hall. A Finite-Element Model for the Olmsted Wicket. Fort Belvoir, VA: Defense Technical Information Center, August 1997. http://dx.doi.org/10.21236/ada329331.

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Burnett, David S., Kwang H. Lee, and Gary S. Sammelmann. Finite-Element Modeling of Acoustic Scattering from Objects in Shallow Water. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada543466.

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Francis, William L., and Daniel P. Nicolella. Finite Element Model to Reduce Fire and Blast Vulnerability. Fort Belvoir, VA: Defense Technical Information Center, January 2013. http://dx.doi.org/10.21236/ada573899.

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Yeh, G. T., and D. D. Huff. FEMA: a Finite Element Model of Material Transport through Aquifers. Office of Scientific and Technical Information (OSTI), January 1985. http://dx.doi.org/10.2172/6135196.

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Feng, Z., X. L. Wang, S. Spooner, G. M. Goodwin, P. J. Maziasz, C. R. Hubbard, and T. Zacharia. A finite element model for residual stress in repair welds. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/244602.

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Kitago, Masaki, Shunsuke Ehara, and Ichiro Hagiwara. Efficient Construction of Finite Element Model by Implicit Function Approximation of CAD Model. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0127.

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Holford, D. J., S. D. Schery, J. L. Wilson, and F. M. Phillips. Radon transport in dry, cracked soil: Two-dimensional, finite element model. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/7147996.

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