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Journal articles on the topic 'Numerical acoustics'

Author: Grafiati

Published: 4 June 2021

Last updated: 22 June 2024

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1

Pei, Xi, Min Xu, and Dong Guo. "Aeroelastic-Acoustics Numerical Simulation Research." Applied Mechanics and Materials 226-228 (November 2012): 500–504. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.500.

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The generation of aerodynamic noise of aircraft in flight is due to dynamical system and aerodynamic .The response of aircraft subjected to High acoustic loads and aerodynamic loads can produce fatigue and damage. In this paper a new Aeroelastic- Acoustics which adds acoustic loads in aeroelastic is presented. The emphasis of the study is the discipline of displacement and load of the flexible structure under the unsteady aerodynamic, inertial, elastic and aero-acoustic. The CFD/CSD/CAA coupling is used to simulate rockets cabin. Sound generated by a rocker is predicted numerically from a Larg

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2

Potter, Samuel F., Maria Cameron, and Ramani Duraiswami. "Numerical geometric acoustics." Journal of the Acoustical Society of America 148, no. 4 (2020): 2693. http://dx.doi.org/10.1121/1.5147456.

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3

Giordano, Nicholas. "Numerical simulations of musical instruments." Journal of the Acoustical Society of America 154, no. 2 (2023): R3—R4. http://dx.doi.org/10.1121/10.0020347.

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4

Postma, Barteld N. J., and Brian F. G. Katz. "An archaeoacoustic study on shape: the case study of the Iffland Theatre’s history (1802–1817)." Acta Acustica 7 (2023): 54. http://dx.doi.org/10.1051/aacus/2023046.

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Previous studies have discussed six pre-Sabine quantifiable guidelines employed in room acoustic design: voice directivity, audience rake, “echo theory”, stage acoustics, reverberation, and length, width, and height ratios. Around the turn of the 18th century, these notions led to two shapes that were theoretically regarded optimal for rooms with acoustical demands: ellipse and semi-circle. The first of these shapes to be tested was the ellipse in the design for the Iffland Theatre (1802–1817). As the resulting acoustics were notoriously poor, contemporary architects and acousticians discussed

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KALTENBACHER, MANFRED. "COMPUTATIONAL ACOUSTICS IN MULTI-FIELD PROBLEMS." Journal of Computational Acoustics 19, no. 01 (2011): 27–62. http://dx.doi.org/10.1142/s0218396x11004286.

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We present physical/mathematical models base on partial differential equations (PDEs) and efficient numerical simulation schemes based on the Finite Element (FE) method for multi-field problems, where the acoustic field is the field of main interest. Acoustics, the theory of sound, is an emerging scientific field including disciplines from physics over engineering to medical science. We concentrate on the following three topics: vibro-acoustics, aero-acoustics and high intensity focused ultrasound. For each topic, we discuss the physical/mathematical modeling, efficient numerical schemes and p

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Dang, Sina, Gang Wang, and Yingbin Chai. "A Novel “Finite Element-Meshfree” Triangular Element Based on Partition of Unity for Acoustic Propagation Problems." Mathematics 11, no. 11 (2023): 2475. http://dx.doi.org/10.3390/math11112475.

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The accuracy of the conventional finite element (FE) approximation for the analysis of acoustic propagation is always characterized by an intractable numerical dispersion error. With the aim of enhancing the performance of the FE approximation for acoustics, a coupled FE-Meshfree numerical method based on triangular elements is proposed in this work. In the proposed new triangular element, the required local numerical approximation is built using point interpolation mesh-free techniques with polynomial-radial basis functions, and the original linear shape functions from the classical FE approx

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7

Stepanov, Robert, Vladimir Pakhov, Andrey Bozhenko, et al. "Experimental and numerical study of rotor aeroacoustics." International Journal of Aeroacoustics 16, no. 6 (2017): 460–75. http://dx.doi.org/10.1177/1475472x17730447.

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The work documents recent experiments at the Kazan National Research Technical University named after A.N. Tupolev (Kazan Aviation Institute), related to helicopter acoustics. The objective is to measure nar-field acoustics of rotors in hover and provide data suitable for computational fluid dynamics validation. The obtained set of data corresponds to a scaled rotor of known planform and the results are of high resolution. An advantage of the current dataset is that direct near-field acoustic data is made available and this allows for easy and direct comparisons with computational fluid dynami

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Bacak, Aykut, and Ali Pinarbasi. "Numerical Investigation of Acoustics Performance of Low- Pressure Ducted Axial Fan by Using Different Turbulence Models." ITM Web of Conferences 22 (2018): 01004. http://dx.doi.org/10.1051/itmconf/20182201004.

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In this article, capacity and acoustics parameters of low pressure ducted axial fan is numerically investigated with Realizable k-epsilon, k-w SST and DES turbulence models by using computational fluid dynamics software. One slice of six bladed axial fan operating at 3000 RPM is simulated periodically as low pressure ducted axial ventilation fan. Simulations are run for operating point on the performance curve for each turbulence models. Investigation of acoustics parameters are obtained Ffowcs-Williams Hawkings acoustic model to calculate sound pressure levels for related frequencies. Numeric

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9

MA, FUYIN, JIU HUI WU, and HAIYUN HOU. "PROGRESS IN PHYSIOLOGICAL ACOUSTICS." Journal of Mechanics in Medicine and Biology 13, no. 05 (2013): 1340007. http://dx.doi.org/10.1142/s0219519413400071.

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Physiological acoustics is a very hot topic in modern acoustic research, which is to study the hearing mechanism and the utterance of both humans and animals. It could be divided into two main aspects: physical acoustics of the ear and physiological acoustics. In physiological acoustics, there are some common research methods, such as objective experimental testing, subjective feelings evaluation survey statistical method, building the physical acoustic model and numerical simulation methods, etc. The authors are researching the accurate mathematical model of equal loudness curves, critical ba

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10

Li, Jing, and Nan Zhang. "Numerical Simulation of the Vibration and Structure-Borne Noise of the Viaduct." Applied Mechanics and Materials 226-228 (November 2012): 401–5. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.401.

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Based on the combination of finite element software ANSYS and acoustics software LMS Virtual.Lab Acoustics, this paper makes an analysis of the Vibration and sound radiation of the viaduct of urban rail transit. First of all, transient dynamic analysis of three-dimensional model of box girder was made in ANSYS, with train passing bridge simulated as a moving load or a moving mass-spring system. Then vibration displacement response obtained is taken as boundary condition of outer sound field, which can achieve accurate acoustic response in Virtual.Lab Acoustics. According to comparing the resul

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11

M, Muthaiah, Ragul Senthilkumar, and Varunkumar S. "Numerical investigation of thermo-acoustic instability in a model afterburner with a simplified model for observed lock-in Phenomena." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 3 (2023): 4088–99. http://dx.doi.org/10.3397/in_2022_0585.

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Thermoacoustic oscillations in a gas turbine afterburner are numerically investigated using CFD. A simplified 2-dimensional axisymmetric afterburner with bluff-body stabilized flame is considered in the investigation. Occurrences of both low and high-frequency thermo-acoustic oscillations in the afterburner chamber are observed at specific fuel flow rates. The flow field from the CFD shows the bluff-body vortex shedding frequency to lock-in with the acoustics of the chamber during the thermo-acoustic oscillations. The synchronization and lock-in of bluff-body wake with chamber acoustics happen

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12

Brentner, Kenneth S. "Direct numerical calculation of acoustics: solution evaluation through energy analysis." Journal of Fluid Mechanics 254 (September 1993): 267–81. http://dx.doi.org/10.1017/s0022112093002125.

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The propagation of acoustic energy from a sound source to the far field is a fundamental problem of acoustics. In this paper the use of computational fluid dynamics (CFD) to directly calculate the acoustic field is investigated. The two-dimensional, compressible, inviscid flow about an accelerating circular cylinder is used as a model problem. The time evolution of the energy transfer from the cylinder surface to the fluid, as the cylinder is moved from rest to some non-negligible velocity, is shown. Energy is the quantity of interest in the calculations since various components of energy have

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WALSH, TIMOTHY, GARTH REESE, CLARK DOHRMANN, and JERRY ROUSE. "FINITE ELEMENT METHODS FOR STRUCTURAL ACOUSTICS ON MISMATCHED MESHES." Journal of Computational Acoustics 17, no. 03 (2009): 247–75. http://dx.doi.org/10.1142/s0218396x0900394x.

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In this paper, a new technique is presented for structural acoustic analysis in the case of nonconforming acoustic–solid interface meshes. We first describe a simple method for coupling nonconforming acoustic–acoustic meshes, and then show that a similar approach, together with the coupling operators from conforming analysis, can also be applied to nonconforming structural acoustics. In the case of acoustic–acoustic interfaces, the continuity of acoustic pressure is enforced with a set of linear constraint equations. For structural acoustic interfaces, the same set of linear constraints is use

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14

Dazel, Olivier. "Education software for numerical acoustics." Journal of the Acoustical Society of America 123, no. 5 (2008): 3653. http://dx.doi.org/10.1121/1.2934951.

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15

He, Dazhuang, Yangfan Liu, and Davide Ziviani. "Numerical modeling of noise and vibration due to discharge in hermetic compressors." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, no. 1 (2022): 362–77. http://dx.doi.org/10.3397/nc-2022-741.

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The pulsive and intermittent nature of the operation of a hermetic refrigeration compressor leads to the generation of noise and vibration during the operation. Specifically, in hermetic compressors, gas pulsation induced by refrigerant discharge is a major source of NVH effects. The generation of noise and vibration due to refrigerant gas discharge is a process that involves thermo-mechanical operation within compressor cylinder, cavity acoustic resonance, valve opening/closing, hermetic shell vibration, and exterior sound radiation. In the presented study, a numerical simulation model was de

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16

Zhang, Zhichao, and Guangzheng Yu. "Influence of sound source directivity on finite element simulation of small-room acoustics." Journal of the Acoustical Society of America 152, no. 4 (2022): A42. http://dx.doi.org/10.1121/10.0015479.

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Numerical simulation is a flexible and effective method for room acoustic design. Full-range simulation of room acoustics requires a combination of different numerical methods, in which wave acoustic methods (WAM) and geometric acoustic methods (GAM) are used for the low and high frequency region, respectively. In the general low-frequency WAM simulation, a sound source is often assumed to be a point source or loudspeakers are usually approximated by circular planar pistons. However, compared to a large room, the critical frequency between WAM and GAM should be higher in acoustic simulation of

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17

van der Harten, Arthur W. "Open-source acoustics simulation in the education environment." Journal of the Acoustical Society of America 152, no. 4 (2022): A255. http://dx.doi.org/10.1121/10.0016192.

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Pachyderm Acoustic Simulation is a professional tool for geometrical and numerical simulation of acoustics in the built environment that happens to be open source under the General Public License. Over the course of the 14 year life of the open-source acoustics simulation project, Pachyderm Acoustic has had the privilege of partnering with numerous academic institutions worldwide to educate architecture and engineering students in acoustics. This has been in the form of support for student projects, lectures and workshops on acoustics simulation and other topics, and, in some cases, PHD advice

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18

Junoh, Ahmad Kadri, Zulkifli Mohd Nopiah, and Ahmad Kamal Ariffin. "Application of Feed-Forward Neural Networks for Classifying Acoustics Levels in Vehicle Cabin." Applied Mechanics and Materials 471 (December 2013): 40–44. http://dx.doi.org/10.4028/www.scientific.net/amm.471.40.

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Vehicle acoustical comfort and vibration in a passenger car cabin are the main factors that attract a buyer in car purchase. Numerous studies have been carried out by automotive researchers to identify and classify the acoustics level in the vehicle cabin. The objective is to form a special benchmark for acoustics level that may be referred for any acoustics improvement purpose. This study is focused on the sound quality change over the engine speed [rp to recognize the noise pattern experienced in the vehicle cabin. Since it is difficult for a passenger to express, and to evaluate the noise e

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19

Herff, S., K. Pausch, H. Nawroth, S. Schlimpert, CO Paschereit, and W. Schröder. "Impact of burner plenum acoustics on the sound emission of a turbulent lean premixed open flame." International Journal of Spray and Combustion Dynamics 12 (January 2020): 175682772095690. http://dx.doi.org/10.1177/1756827720956906.

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The acoustic field of a turbulent lean cpremixed open flame is numerically investigated by a hybrid method solving the Navier-Stokes equations in a large-eddy simulation formulation and the acoustic perturbation equations. The interaction of acoustic modes of a burner plenum and the turbulent flame is analyzed with respect to the sound emission of the flame. It is investigated if a simplified computation yields a good broadband agreement of the sound pressure spectrum with experimental measurements. The results of two numerical setups, i.e., the first configuration consists of the burner plus

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20

Guan, Ke Tian, Xu Pin Zhuang, Hong Jun Li, and Men Qin Li. "Theoretical Calculating Acoustical Absorption Coefficient of Nonwoven Fabrics." Advanced Materials Research 332-334 (September 2011): 1312–17. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.1312.

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Nonwoven fabrics possess good acoustics properties and are used widely in many fields. Based on the Zwikker and Kosten theory, this paper suggests a numerical method for calculating their acoustical absorption coefficient.

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21

Skvortsov, Alex, Shuang J. Zhu, Richard Manasseh, Andrew Ooi, and Martin Kocan. "Dynamics and acoustics of bubbly plumes." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A125. http://dx.doi.org/10.1121/10.0023002.

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Transient bubbly plume dynamics including their effects on the free surface were studied numerically using a simple numerical model based on integral theory [1, 2] and Eulerian–Eulerian coupled large Eddy simulation (EE-LES) method. The EE-LES model was validated with the interfacial closures evaluated for drag, lift and virtual mass forces. The simulation data showed good agreement with both numerical predictions and experimental measurements in the literature. The spectrum of the surface pressure fluctuations and acoustical pressure induced by a bubbly plume were extracted from numerical sim

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22

Gao, Sheng Yao, and De Shi Wang. "An Indirect Boundary Element Method for Computing Sound Field." Advanced Materials Research 476-478 (February 2012): 1173–77. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1173.

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Computing sound field from an arbitrary radiator is of interest in acoustics, with many significant applications, one that includes the design of classical projectors and the noise prediction of underwater vehicle. To overcome the non-uniqueness of solution at eigenfrequencies in the boundary integral equation method for structural acoustic radiation, wave superposition method is introduced to study the acoustics. In this paper, the theoretical backgrounds to the direct boundary element method and the wave superposition method are presented. The wave superposition method does not solve the Kir

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23

Etter, Paul C. "Numerical modeling techniques in underwater acoustics." Journal of the Acoustical Society of America 82, S1 (1987): S102. http://dx.doi.org/10.1121/1.2024528.

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24

Jackson, T. L., Michéle G. Macaraeg, and M. Y. Hussaini. "The role of acoustics in flame/vortex interactions." Journal of Fluid Mechanics 254 (September 1993): 579–603. http://dx.doi.org/10.1017/s0022112093002265.

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The role of acoustics in flame/vortex interactions is examined via asymptotic analysis and numerical simulation. The model consists of a one-step, irreversible Arrhenius reaction between initially unmixed species occupying adjacent half-planes which are allowed to mix and react by convection and diffusion in the presence of an acoustic field or a time-varying pressure field of small amplitude. The main emphasis is on the influence of the acoustics on the ignition time and flame structure as a function of vortex Reynolds number and initial temperature differences of the reactants.

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25

Chirico, G., G. N. Barakos, and N. Bown. "Numerical aeroacoustic analysis of propeller designs." Aeronautical Journal 122, no. 1248 (2017): 283–315. http://dx.doi.org/10.1017/aer.2017.123.

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ABSTRACTAs propeller-driven aircraft are the best choice for short/middle-haul flights but their acoustic emissions may require improvements to comply with future noise certification standards, this work aims to numerically evaluate the acoustics of different modern propeller designs. Overall sound pressure level and noise spectra of various blade geometries and hub configurations are compared on a surface representing the exterior fuselage of a typical large turboprop aircraft. Interior cabin noise is also evaluated using the transfer function of a Fokker 50 aircraft. A blade design operating

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26

Okuzono, Takeshi, M. Shadi Mohamed, and Kimihiro Sakagami. "Potential of Room Acoustic Solver with Plane-Wave Enriched Finite Element Method." Applied Sciences 10, no. 6 (2020): 1969. http://dx.doi.org/10.3390/app10061969.

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Predicting room acoustics using wave-based numerical methods has attracted great attention in recent years. Nevertheless, wave-based predictions are generally computationally expensive for room acoustics simulations because of the large dimensions of architectural spaces, the wide audible frequency ranges, the complex boundary conditions, and inherent error properties of numerical methods. Therefore, development of an efficient wave-based room acoustic solver with smaller computational resources is extremely important for practical applications. This paper describes a preliminary study aimed a

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27

Li, Dong Fang, and Randolph Chi Kin Leung. "Advanced design of Close-Proximity (CPX) trailer enclosure acoustics on tyre/road noise measurement." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (2021): 1346–59. http://dx.doi.org/10.3397/in-2021-1822.

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The PolyU Mark II Twin-wheeled CPX trailer was developed for the measurement of tyre/road noise in Hong Kong urban environment according to a standard methodology (ISO/CD 11819-2) - the Close-Proximity (CPX) method. Numerical simulations of the acoustics of PolyU Mark II CPX enclosure were conducted and a good agreement between numerical and experimental results was obtained. In order to extend the capacity of the Mark II CPX trailer and enhance the acoustic performance within the enclosure for future tyre/road noise studies, the validated numerical simulations were carried on to design the ne

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Cao, Jun, Fenghua Qi, Senlin Yan, and Lifa Zhang. "Design of highly-efficient acoustic waveguide couplers using impedance-tunable transformation acoustics." International Journal of Modern Physics B 34, no. 32 (2020): 2050250. http://dx.doi.org/10.1142/s0217979220502501.

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In this paper, the theory of impedance-tunable transformation acoustics in the geometric-acoustics limit is proposed to design efficient two-dimensional acoustic waveguide couplers. By choosing suitable impedance functions in the original space, impedance matching between the transformation medium and the background medium becomes possible, and the reflection at the boundary is reduced. The theory can be used to enable efficient acoustic coupling between waveguides of different sizes and different embedded media. By selecting an appropriate impedance function and a tunable acoustic refractive

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29

Hichem, Hafdaoui, and Benatia Djamel. "Comparative between (LiNbO3) and (LiTaO3) in detecting acoustics microwaves using classification." IAES International Journal of Artificial Intelligence (IJ-AI) 8, no. 1 (2019): 33. http://dx.doi.org/10.11591/ijai.v8.i1.pp33-43.

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Our work is mainly about detecting acoustics microwaves in the type of BAW (Bulk acoustic waves), where we compared between Lithium Niobate (LiNbO3) and Lithium Tantalate (LiTaO3) ,during the propagation of acoustic microwaves in a piezoelectric substrate. In this paper, We have used the classification by Probabilistic Neural Network (PNN) as a means of numerical analysis in which we classify all the values of the real part and the imaginary part of the coefficient attenuation with the acoustic velocity for conclude whichever is the best in utilization for generating bulk acoustic waves.This s

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30

MANNEVILLE, SÉBASTIEN, CLAIRE PRADA, MICKAËL TANTER, MATHIAS FINK, and JEAN-FRANÇOIS PINTON. "ULTRASOUND PROPAGATION THROUGH A ROTATIONAL FLOW: NUMERICAL METHODS COMPARED TO EXPERIMENTS." Journal of Computational Acoustics 09, no. 03 (2001): 841–52. http://dx.doi.org/10.1142/s0218396x01001054.

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Sound propagation through a vortex is studied numerically using two different techniques: ray-tracing and finite-differences. Geometrical acoustics and ray-tracing are shown to yield a good picture of the interaction between a sound wave and a vortex when the ratio of the vortex radius to the acoustic wavelength is larger than one. In particular, this technique allows to take into account finite-size effects such as edge waves and the results are compared to experimental data. The interest of the finite-difference approach is demonstrated for cases where sound scattering occurs. We show the ab

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31

Postma, Barteld N. J., Evan Green, Eckhard Kahle, and Brian F. G. Katz. "Pre-Sabine Room Acoustic Guidelines on Audience Rake, Stage Acoustics, and Dimension Ratios." Acoustics 3, no. 2 (2021): 235–51. http://dx.doi.org/10.3390/acoustics3020017.

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Prior to Sabine’s work on the Fogg Art Museum and Boston Symphony Hall, several numerical guidelines had been developed and applied to the design of rooms with specific acoustic demands such as theatres, concert halls, and opera houses. Previous papers have discussed guidelines based on the following principles: voice directivity, which was employed in the design of at least 11 rooms; “echo theory”, which quantifies the perception threshold between direct sound and first order reflections in order to prevent echoes from occurring, aiding in the design of at least 7 rooms and leading to the fir

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32

Minin, Oleg, and Igor Minin. "THE POSSIBILITY OF FOCUSING THE ACOUSTIC RADIATION INTO A REGION LESS THAN THE DIFFRACTION LIMIT." Interexpo GEO-Siberia 8 (2019): 100–103. http://dx.doi.org/10.33764/2618-981x-2019-8-100-103.

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Metamaterial lenses are used to achieve sharp focus in the optical range and in acoustics. Recently, an innovative concept called "acoustojet" was proposed, in which it is possible to focus the acoustic energy in an area with transverse dimensions less than λ/2. By numerical simulation and the experiment it is shown that sharp focusing is possible in acoustics. It is demonstrated by choosing the appropriate size of a simple cylindrical lens (a mesoscale particle in the shape of a cylinder) and relative speed of sound between the lens material and the environment. In this case, an acoustic jet

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33

Martinus, F., D. W. Herrin, and A. F. Seybert. "Surface Vibration Reconstruction using Inverse Numerical Acoustics." ITB Journal of Engineering Science 35, no. 1 (2003): 61–80. http://dx.doi.org/10.5614/itbj.eng.sci.2003.35.1.5.

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Birkhoff, Garrett. "Some mathematical problems of numerical ocean acoustics." Computers & Mathematics with Applications 11, no. 7-8 (1985): 643–54. http://dx.doi.org/10.1016/0898-1221(85)90161-0.

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Strawn, Roger C., and Rupak Biswas. "Numerical simulations of helicopter aerodynamics and acoustics." Journal of Computational and Applied Mathematics 66, no. 1-2 (1996): 471–83. http://dx.doi.org/10.1016/0377-0427(95)00171-9.

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Kurra, Selma, and Ayca Sentop. "Interaction between annoyance, indoor noise levels and acoustic classification of buildings." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 1 (2023): 6519–30. http://dx.doi.org/10.3397/in_2022_0980.

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Assessment of annoyance "at home" from environmental noises has been widely investigated so far and the ISO/TS 15666:2021 was developed to lead the socio-acoustic surveys. On the other hand, the rating of buildings' acoustical performance considering also the indoor noises, has been also well concerned in building acoustics and the studies have ended up with the ISO/TS 19488:2021 covering the acoustic classification system for buildings. Basically the rating system needs to be supported by the subjective tests in the field or in laboratories, to acquire data about the annoyance/disturbance or

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Yang, Dang Guo, Yong Hang Wu, Jin Min Liang, and Jun Liu. "An Investigation on Numerical Simulation Method for Aero-Acoustics Based on Acoustics Analogy." Applied Mechanics and Materials 444-445 (October 2013): 462–67. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.462.

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A numerical simulation method on noise prediction, which incorporates aerodynamics and sound wave equations based on acoustic analogy, is presented in the paper. Near-field unsteady aerodynamic characteristic can be obtain by large eddy simulation (LES), and far-field propagation of sound waves and spatial sound-field can be obtain by solving the time-domain integral equations of Ffowcs Williams and Hawings (FW-H). Based on the method, a numerical simulation was done on a two-dimension cylinder and a three-dimension flat plate with blunt leading edge. The agreement of numerical results with ex

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38

Henríquez, V. Cutanda, P. Risby Andersen, J. Søndergaard Jensen, P. Møller Juhl, and J. Sánchez-Dehesa. "A Numerical Model of an Acoustic Metamaterial Using the Boundary Element Method Including Viscous and Thermal Losses." Journal of Computational Acoustics 25, no. 04 (2017): 1750006. http://dx.doi.org/10.1142/s0218396x17500060.

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In recent years, boundary element method (BEM) and finite element method (FEM) implementations of acoustics in fluids with viscous and thermal losses have been developed. They are based on the linearized Navier–Stokes equations with no flow. In this paper, such models with acoustic losses are applied to an acoustic metamaterial. Metamaterials are structures formed by smaller, usually periodic, units showing remarkable physical properties when observed as a whole. Acoustic losses are relevant in metamaterials in the millimeter scale. In addition, their geometry is intricate and challenging for

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Iemma, Umberto, and Giorgio Palma. "On the Use of the Analogue Transformation Acoustics in Aeroacoustics." Mathematical Problems in Engineering 2017 (2017): 1–16. http://dx.doi.org/10.1155/2017/8981731.

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The objective of the paper is the assessment of the Analogue Transformation Acoustics (ATA) in the design of acoustic metamaterial for aeronautical applications. The work focuses on the consistency of the background flow resulting from the application of the ATA with the equations governing the potential aerodynamics. Indeed, in case of acoustic perturbations propagating within moving media, the convective terms in the governing equations are responsible for the failure of formal invariance under the action of conformal mappings. The ATA approach overcomes this limitation, introducing the poss

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Dhia, A. S. Bonnet-Ben, J. F. Mercier, F. Millot, S. Pernet, and E. Peynaud. "Time-Harmonic Acoustic Scattering in a Complex Flow: A Full Coupling Between Acoustics and Hydrodynamics." Communications in Computational Physics 11, no. 2 (2012): 555–72. http://dx.doi.org/10.4208/cicp.221209.030111s.

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AbstractFor the numerical simulation of time harmonic acoustic scattering in a complex geometry, in presence of an arbitrary mean flow, the main difficulty is the coexistence and the coupling of two very different phenomena: acoustic propagation and convection of vortices. We consider a linearized formulation coupling an augmented Galbrun equation (for the perturbation of displacement) with a time harmonic convection equation (for the vortices). We first establish the well-posedness of this time harmonic convection equation in the appropriate mathematical framework. Then the complete problem,

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Patlashenko, Igor, and Dan Givoli. "Non-Reflecting Finite Element Schemes for Three-Dimensional Acoustic Waves." Journal of Computational Acoustics 05, no. 01 (1997): 95–115. http://dx.doi.org/10.1142/s0218396x97000071.

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The finite element solution of problems involving three-dimensional acoustic waves in an infinite wave guide, and in the infinite medium around a structure is considered. Such problems are typical in structural acoustics, and this paper concentrates on the efficient numerical treatment of the infinite acoustic medium away from the structure. The unbounded domain is truncated by means of an artificial boundary ℬ. On ℬ, non-reflecting boundary conditions are used; these are either nonlocal Dirichlet-to-Neumann conditions, or their localized counterparts. For the high-order localized conditions,

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Li, Hong Kun, Jian Ding, and Cheng Guo. "Acoustic Simulation for the Gearing Engagement System." Applied Mechanics and Materials 130-134 (October 2011): 677–80. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.677.

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This paper concentrates on modeling the gear transmission system using a three-dimensional finite-element approach for the acoustic radiation analysis and control. The combination of dynamic analysis and vibration response calculation for the gear engagement system can contribute to evaluate acoustic radiation. A case study of for gear engagement system internally excited with gear mesh fluctuation is presented in this research. Acoustic radiation quantity investigation has been carried out by Virtual.Lab Acoustics software. It can be concluded that numerical simulation is very important durin

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Boluriaan, Said, and Philip J. Morris. "Acoustic Streaming: From Rayleigh to Today." International Journal of Aeroacoustics 2, no. 3 (2003): 255–92. http://dx.doi.org/10.1260/147547203322986142.

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This paper reviews the current state of knowledge of several classes of acoustic streaming. Acoustic streaming is classified based on the different mechanisms by which it is generated. For each category, the main achievements in terms of analysis, experimental work, and numerical simulation are described. An order of magnitude analysis, applicable to all types of acoustic streaming, is also given. This provides an additional means to classify acoustic streaming as either slow or fast, depending on the amplitude of the primary driving mechanism. The significant lack of understanding in the gene

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Fan, Feng, Yaxiong Cao, Lusheng Jiang, and Yongfeng Lin. "Research on Calculation Method for Acoustic Scattering of Helicopter Noise." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 38, no. 6 (2020): 1275–83. http://dx.doi.org/10.1051/jnwpu/20203861275.

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A new calculation method of helicopter rotor/fuselage acoustic scattering is developed. Firstly, a CFD analysis model is developed to simulate flow field of the rotor, which is based on the motional embedded grid system and RANS equations, and provides aerodynamic data for rotor noise calculation. Then, FW-H equations are employed to calculate the aeroacoustic characteristics of isolated rotor, and G 1A formulas are applied to calculate the rotor acoustic gradient to provide boundary condition for acoustic scattering. Based on these, the time-domain equivalent source method is applied to calcu

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Xu, Weikai, Yingchun Tang, Meng Zhang, Wuchao Qi, and Wei Wang. "Arbitrary shaped acoustic omnidirectional absorber based on transformation theory." International Journal of Modern Physics B 34, no. 11 (2020): 2050111. http://dx.doi.org/10.1142/s0217979220501118.

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In this study, an arbitrary shaped acoustic omnidirectional absorber (AOA) is achieved for absorbing incoming acoustic/elastic waves in the ambient environment. Using the transformation acoustics theory, we present a theoretical framework for two-dimensional acoustic path guidance around arbitrary shapes for which the material parameters in the transformed space can be obtained analytically. Results indicate that the transformed space is distorted rather than compressed; numerical simulations confirm that these absorbers exhibit a remarkably large absorption and that the proposed method can co

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Chou, Yu-Tuan, and Shao-Yi Hsia. "Numerical Analysis of Indoor Sound Quality Evaluation Using Finite Element Method." Mathematical Problems in Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/420316.

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Indoors sound field distribution is important to Room Acoustics, but the field suffers numerous problems, for example, multipath propagation and scattering owing to sound absorption by furniture and other aspects of décor. Generally, an ideal interior space must have a sound field with clear quality. This provides both the speaker and the listener with a pleasant conversational environment. This investigation uses the Finite Element Method to assess the acoustic distribution based on the indoor space and chamber volume. In this situation, a fixed sound source at different frequencies is used t

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Vanhille, Christian, Cristian Pantea, and Dipen N. Sinha. "Acoustic Characterization of Fluorinert FC-43 Liquid with Helium Gas Bubbles: Numerical Experiments." Shock and Vibration 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/2518168.

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In this work, we define the acoustic characteristics of a biphasic fluid consisting of static helium gas bubbles in liquid Fluorinert FC-43 and study the propagation of ultrasound of finite amplitudes in this medium. Very low sound speed and high sound attenuation are found, in addition to a particularly high acoustic nonlinear parameter. This result suggests the possibility of using this medium as a nonlinear enhancer in various applications. In particular, parametric generation of low ultrasonic frequencies is studied in a resonator cavity as a function of driving pressure showing high conve

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Djambazov, Georgi. "Time-Dependent Numerical Modelling of Acoustic Cavitation in Liquid Metal Driven by Electromagnetic Induction." Fluids 8, no. 3 (2023): 79. http://dx.doi.org/10.3390/fluids8030079.

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The numerically simulated method of using electromagnetic field from an alternating current is a patented method to create in liquid metal, under the conditions of resonance, acoustic waves of sufficient strength to cause cavitation and implosion of gas bubbles, leading to beneficial degassing and grain refinement. The modelling stages of electromagnetics are described below along with acoustics in liquids, bubble dynamics, and their interactions. Sample results are presented for a cylindrical container with liquid aluminium surrounded by an induction coil. The possibility of establishing acou

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Shiva Prasad Uppu and Naren Shankar Radha Krishnan. "Turbulent Airflows over Serrated Wings: A Review on Experimental and Numerical Analysis." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 109, no. 1 (2023): 27–40. http://dx.doi.org/10.37934/arfmts.109.1.2740.

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The serrations on the blade's cutting edge and trailing edge are supposed to assist humans deal with noise, but the main idea is for research and use in nature. This research examines trailing edge extension hydrodynamics. Further, reducing the turbulent wake intensity behind the TE increases aerodynamic performance while leaving the static pressure distribution (as averaged across the span) substantially unaffected. Computational Aero-Acoustics simulates aerodynamic and acoustic reactions. This work discusses the experimental and computer simulations of turbulent flows. This paper provides th

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Jaimes, Manuel, and Roel Snieder. "Illustration of diffusion and equipartitioning as local processes: A numerical study using the scalar radiative transfer equation." Journal of the Acoustical Society of America 153, no. 4 (2023): 2148–64. http://dx.doi.org/10.1121/10.0017805.

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We study the transition from ballistic to diffusive to equipartitioned waves in scattering media using the acoustic radiative transfer equation. To solve this equation, we first transform it into an integral equation for the specific intensity and then construct a time stepping algorithm with which we evolve the specific intensity numerically in time. We handle the advection of energy analytically at the computational grid points and use numerical interpolation to deal with advection terms that do not lie on the grid points. This approach allows us to reduce the numerical dispersion, compared

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