Log in

Relevant bibliographies by topics / Multimodal acoustic propagation / Journal articles

To see the other types of publications on this topic, follow the link: Multimodal acoustic propagation.

Journal articles on the topic 'Multimodal acoustic propagation'

Author: Grafiati

Published: 19 June 2022

Last updated: 31 July 2025

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

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Multimodal acoustic propagation.'

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

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

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Mangin, B., G. Gabard, and M. Daroukh. "In-duct flow computation and acoustic propagation using the admittance multimodal formulation." Journal of the Acoustical Society of America 155, no. 5 (2024): 3461–74. http://dx.doi.org/10.1121/10.0026091.

Full text

Abstract:

A multimodal method for computing the potential base flow and propagating acoustic perturbations inside axisymmetric ducts is presented. Instead of using the standard modal basis, a polynomial basis is used in the radial direction to reduce the computational cost of the method, but this introduces non-physical high-order modes. The impact of these modes on the stability of the calculation is examined, and for the acoustic computation, a modification of the axial integration is proposed to improve the conditioning of the matrices involved. The flow computation is achieved by applying the method

APA, Harvard, Vancouver, ISO, and other styles

2

Félix, S., and V. Pagneux. "Multimodal analysis of acoustic propagation in three-dimensional bends." Wave Motion 36, no. 2 (2002): 157–68. http://dx.doi.org/10.1016/s0165-2125(02)00009-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Troian, R., D. Dragna, C. Bailly, and M. A. Galland. "Broadband liner impedance eduction for multimodal acoustic propagation in the presence of a mean flow." Proceedings of the Mavlyutov Institute of Mechanics 11, no. 2 (2016): 150–55. http://dx.doi.org/10.21662/uim2016.2.022.

Full text

Abstract:

Modeling of acoustic propagation in a duct with absorbing treatment is considered. The surface impedance of the treatment is sought in the form of a rational fraction. The numerical model is based on a resolution of the linearized Euler equations by finite difference time domain for the calculation of the acoustic propagation under a grazing flow. Sensitivity analysis of the considered numerical model is performed. The uncertainty of the physical parameters is taken into account to determine the most influential input parameters. The robustness of the solution vis-a-vis changes of the flow cha

APA, Harvard, Vancouver, ISO, and other styles

4

Mangin, Bruno, and Gwénaël Gabard. "Acoustic radiation from an engine intake using an admittance multimodal method." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 5 (2023): 3513–24. http://dx.doi.org/10.3397/in_2023_0502.

Full text

Abstract:

This paper presents an adaptation of the admittance multimodal method for computing the mean flow around an engine intake and the associated radiated acoustic field. The basic idea is to surround the engine with a fictive duct with a perfectly matched layer on its outer wall which simulates far-field conditions and avoids any acoustic reflection. The use of matching conditions between this duct and the engine duct allows for calculating the flow and acoustic admittance matrices (and then the associated fields) everywhere. The developed method, initially devoted to acoustic propagation, can als

APA, Harvard, Vancouver, ISO, and other styles

5

Liu, Juan, and Qi Li. "Coupled Mode Sound Propagation in Inhomogeneous Stratified Waveguides." Applied Sciences 11, no. 9 (2021): 3957. http://dx.doi.org/10.3390/app11093957.

Full text

Abstract:

An efficient coupled mode method for modeling sound propagation in horizontally stratified inhomogeneous waveguides, in which the seabed is modeled as a (layered) acoustic medium, is presented. The method is based on Fawcett’s coupled mode method and the multimodal admittance method. The acoustic field is expanded onto the unusual local eigenfunctions composed by normal modes in the corresponding one-layer homogeneous waveguides with constant depth equal to the local total depth of the multilayered waveguide. A set of energy-conserving first-order differential equations governing the modal amp

APA, Harvard, Vancouver, ISO, and other styles

6

McTavish, James P., and Edward J. Brambley. "Nonlinear sound propagation in two-dimensional curved ducts: a multimodal approach." Journal of Fluid Mechanics 875 (July 19, 2019): 411–47. http://dx.doi.org/10.1017/jfm.2019.497.

Full text

Abstract:

A method for studying weakly nonlinear acoustic propagation in two-dimensional ducts of general shape – including curvature and variable width – is presented. The method is based on a local modal decomposition of the pressure and velocity in the duct. A pair of nonlinear ordinary differential equations for the modal amplitudes of the pressure and velocity modes is derived. To overcome the inherent instability of these equations, a nonlinear admittance relation between the pressure and velocity modes is presented, introducing a novel ‘nonlinear admittance’ term. Appropriate equations for the ad

APA, Harvard, Vancouver, ISO, and other styles

7

Félix, Simon, Agnès Maurel, and Jean-François Mercier. "Improved multimodal methods for the acoustic propagation in waveguides with finite wall impedance." Wave Motion 54 (April 2015): 1–10. http://dx.doi.org/10.1016/j.wavemoti.2014.11.007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Baccouche, Ryan, Soléne Moreau, and Mabrouk Ben Tahar. "Test of single degree of freedom acoustic treatment impedance models for multimodal acoustic propagation in duct with flow." Journal of the Acoustical Society of America 141, no. 6 (2017): 4168–78. http://dx.doi.org/10.1121/1.4983653.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Boucheron, R., H. Bailliet, and J. C. Valiere. "Analytical solution of multimodal acoustic propagation in circular ducts with laminar mean flow profile." Journal of Sound and Vibration 292, no. 3-5 (2006): 504–18. http://dx.doi.org/10.1016/j.jsv.2005.08.017.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Odo, Wataru, Daisuke Kimoto, Makoto Kumon, and Tomonari Furukawa. "Active Sound Source Localization by Pinnae with Recursive Bayesian Estimation." Journal of Robotics and Mechatronics 29, no. 1 (2017): 49–58. http://dx.doi.org/10.20965/jrm.2017.p0049.

Full text

Abstract:

[abstFig src='/00290001/05.jpg' width='300' text='Schematic of the proposed system for actively localizing the sound source' ] Animals use two ears to localize the source of a sound, and this paper considers a robot system that localizes a sound source by using two microphones with active external reflectors that mimic movable pinnae. The body of the robot and the environment both affect the propagation of sound waves, which complicates mapping the acoustic cues to the source. The mapping may be multimodal, and the observed acoustic cues may lead to the incorrect estimation of the locations. I

APA, Harvard, Vancouver, ISO, and other styles

11

Mercier, Jean-François, and Agnès Maurel. "Acoustic propagation in non-uniform waveguides: revisiting Webster equation using evanescent boundary modes." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 469, no. 2156 (2013): 20130186. http://dx.doi.org/10.1098/rspa.2013.0186.

Full text

Abstract:

The scattering of an acoustic wave propagating in a non-uniform waveguide is inspected by revisiting improved multimodal methods in which the introduction of additional modes, so-called boundary modes, allows to better satisfy the Neumann boundary conditions at the varying walls. In this paper, we show that the additional modes can be identified as evanescent modes. Although non-physical, these modes are able to tackle the evanescent part of the field omitted by the truncation and are able to restore the right boundary condition at the walls. In the low-frequency regime, the system can be solv

APA, Harvard, Vancouver, ISO, and other styles

12

Troian, Renata, Didier Dragna, Christophe Bailly, and Marie-Annick Galland. "Broadband liner impedance eduction for multimodal acoustic propagation in the presence of a mean flow." Journal of Sound and Vibration 392 (March 2017): 200–216. http://dx.doi.org/10.1016/j.jsv.2016.10.014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Mercier, Jean-François, and Agnès Maurel. "Improved multimodal method for the acoustic propagation in waveguides with a wall impedance and a uniform flow." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, no. 2190 (2016): 20160094. http://dx.doi.org/10.1098/rspa.2016.0094.

Full text

Abstract:

We present an efficient multimodal method to describe the acoustic propagation in the presence of a uniform flow in a waveguide with locally a wall impedance treatment. The method relies on a variational formulation of the problem, which allows to derive a multimodal formulation within a rigorous mathematical framework, notably to properly account for the boundary conditions on the walls (being locally the Myers condition and the Neumann condition otherwise). Also, the method uses an enriched basis with respect to the usual cosine basis, able to absorb the less converging part of the modal ser

APA, Harvard, Vancouver, ISO, and other styles

14

Fadden, Christopher, and Sri-Rajasekhar Kothapalli. "A Single Simulation Platform for Hybrid Photoacoustic and RF-Acoustic Computed Tomography." Applied Sciences 8, no. 9 (2018): 1568. http://dx.doi.org/10.3390/app8091568.

Full text

Abstract:

In recent years, multimodal thermoacoustic imaging has demonstrated superior imaging quality compared to other emerging modalities. It provides functional and molecular information, arising due to electromagnetic absorption contrast, at ultrasonic resolution using inexpensive and non-ionizing imaging methods. The development of optical- as well as radio frequency (RF)-induced thermoacoustic imaging systems would benefit from reliable numerical simulations. To date, most numerical models use a combination of different software in order to model the hybrid thermoacoustic phenomenon. Here, we dem

APA, Harvard, Vancouver, ISO, and other styles

15

Wilson, Trevor C., Elizabeth A. Silber, Thomas A. Colston, Brian R. Elbing, and Thom R. Edwards. "Bolide Infrasound Signal Morphology and Yield Estimates: A Case Study of Two Events Detected by a Dense Acoustic Sensor Network." Astronomical Journal 169, no. 4 (2025): 223. https://doi.org/10.3847/1538-3881/adbb70.

Full text

Abstract:

Abstract Two bolides (2016 June 2 and 2019 April 4) were detected at multiple regional infrasound stations, with many of the locations receiving multiple detections. Analysis of the received signals was used to estimate the yield, location, and trajectory, as well as the type of shock that produced the received signal. The results from the infrasound analysis were compared with ground-truth information that was collected through other sensing modalities. This multimodal framework offers an expanded perspective on the processes governing bolide shock generation and propagation. The majority of

APA, Harvard, Vancouver, ISO, and other styles

16

Bailliet, H., R. Boucheron, J. P. Dalmont, Ph Herzog, S. Moreau, and J. C. Valière. "Setting up an experimental apparatus for the study of multimodal acoustic propagation with turbulent mean flow." Applied Acoustics 73, no. 3 (2012): 191–97. http://dx.doi.org/10.1016/j.apacoust.2011.07.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

An, Jingge, Chao Pan, and Xiaobo Shi. "Electromagnetic–Mechanical–Acoustic Coupling Analysis of Transformers Under Geomagnetically Induced Current Interference." Machines 13, no. 5 (2025): 437. https://doi.org/10.3390/machines13050437.

Full text

Abstract:

During geomagnetic storms, a geomagnetically induced current (GIC) flows into grounding transformers, potentially causing anomalous vibrations and audible noise in internal components. This study establishes an electromagnetic–mechanical–acoustic coupling (EMAC) model to characterize the multi-physics interactions in transformers under GIC interference. Based on the measured data, the GIC is classified into fluctuating and constant components according to its fluctuation characteristics. A propagation-path-based coupling model is proposed to investigate the correlated interactions among physic

APA, Harvard, Vancouver, ISO, and other styles

18

Kantartzis, Nikolaos V., Theodoros K. Katsibas, Christos S. Antonopoulos, and Theodoros D. Tsiboukis. "A 3D multimodal FDTD algorithm for electromagnetic and acoustic propagation in curved waveguides and bent ducts of varying cross‐section." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 23, no. 3 (2004): 613–24. http://dx.doi.org/10.1108/03321640410540520.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Xu, Tong, Bin Wu, Xiang Gao, Jianfeng Liu, and Xiucheng Liu. "Lamb Wave-Based FDM-PPM Method Data Transmission Scheme in Plate Structures." Sensors 25, no. 6 (2025): 1907. https://doi.org/10.3390/s25061907.

Full text

Abstract:

Lamb wave-based non-electromagnetic communication is an effective solution for real-time information exchange in health monitoring networks of large metallic plate structures. The multimodal nature, dispersive characteristics, and the influence of reflected waves during the propagation of Lamb waves severely limit the duration of communication signals. Within this constrained time, constructing communication signals reasonably is crucial for improving the transmission rate of Lamb wave acoustic data. A coding method based on frequency-division multiplexing–pulse-position modulation (FDM-PPM) i

APA, Harvard, Vancouver, ISO, and other styles

20

Zaccherini, R., A. Palermo, A. Marzani, A. Colombi, V. K. Dertimanis, and E. N. Chatzi. "Geometric and material attenuation of surface acoustic modes in granular media." Geophysical Journal International 230, no. 1 (2022): 288–97. http://dx.doi.org/10.1093/gji/ggac076.

Full text

Abstract:

SUMMARY Granular materials can be used in laboratory-scale physical models to simulate and study seismic wave propagation in various unconsolidated, porous heterogeneous media. This is due to the diverse available grain configurations, in terms of their shape, size and mechanical parameters, which enable the physical and geological modelling of various complex substrates. In this work, an unconsolidated granular medium, made of silica microbeads, featuring a gravity-induced power-law stiffness profile is experimentally tested in a laboratory setting. The objective is to investigate the attenua

APA, Harvard, Vancouver, ISO, and other styles

21

Xu, Kunbo, Zekai Zong, Dongjun Liu, Ran Wang, and Liang Yu. "Deep Learning-Based Sound Source Localization: A Review." Applied Sciences 15, no. 13 (2025): 7419. https://doi.org/10.3390/app15137419.

Full text

Abstract:

As a fundamental technology in environmental perception, sound source localization (SSL) plays a critical role in public safety, marine exploration, and smart home systems. However, traditional methods such as beamforming and time-delay estimation rely on manually designed physical models and idealized assumptions, which struggle to meet practical demands in dynamic and complex scenarios. Recent advancements in deep learning have revolutionized SSL by leveraging its end-to-end feature adaptability, cross-scenario generalization capabilities, and data-driven modeling, significantly enhancing lo

APA, Harvard, Vancouver, ISO, and other styles

22

Ustinova, Elena S., Vladimir I. Volovach, Tatyana A. Antipova, and Kaira A. Adishirin-Zade. "Reflection of waves from a mobile elastic layer in a multimode waveguide." Physics of Wave Processes and Radio Systems 24, no. 2 (2021): 73–78. http://dx.doi.org/10.18469/1810-3189.2021.24.2.73-78.

Full text

Abstract:

Waveguide structures are used to transmit energy and information signals in a wide range of wavelengths and, in terms of wave-guiding physical properties, usually have mutual (identical) properties in forward and backward directions. The asymmetry of the structure and external influences can often cause non-reciprocity of structures for waves, propagating in mutually opposite directions (this property, although limited, is already used in the so-called nonreciprocal devices of microwave, EHF and optical ranges such as ferrite valves, circulators, phase shifters). At the same time, the nonrecip

APA, Harvard, Vancouver, ISO, and other styles

23

Ageykin, Nikita, Vladimir Anisimkin, Andrey Smirnov, et al. "An Electronic “Tongue” Based on Multimode Multidirectional Acoustic Plate Wave Propagation." Sensors 24, no. 19 (2024): 6301. http://dx.doi.org/10.3390/s24196301.

Full text

Abstract:

This paper theoretically and experimentally demonstrates the possibility of detecting the five basic tastes (salt, sweet, sour, umami, and bitter) using a variety of higher-order acoustic waves propagating in piezoelectric plates. Aqueous solutions of sodium chloride (NaCl), glucose (C6H12O6), citric acid (C6H8O7), monosodium glutamate (C5H8NO4Na), and sagebrush were used as chemicals for the simulation of each taste. These liquids differed from each other in terms of their physical properties such as density, viscosity, electrical conductivity, and permittivity. As a total acoustic response t

APA, Harvard, Vancouver, ISO, and other styles

24

Smirnov, Andrey, Vladimir Anisimkin, Natalia Voronova, et al. "Multimode Design and Piezoelectric Substrate Anisotropy Use to Improve Performance of Acoustic Liquid Sensors." Sensors 22, no. 19 (2022): 7231. http://dx.doi.org/10.3390/s22197231.

Full text

Abstract:

Using acoustic wave modes propagation in piezoelectric plates loaded with conductive liquids, peculiarities of the mode-liquid acoustoelectric interaction are studied. It is found that (i) in contrast to bulk and surface acoustic waves propagating in piezoelectric semiconductors, the acoustoelectric attenuation of the modes is not symmetric in respect to its maximum, (ii) a large increase in attenuation may be accompanied by a small decrease in phase velocity and vice versa, (iii) the peculiarities are valid for “pure” (without beam steering) and “not pure” (with beam steering) modes, as well

APA, Harvard, Vancouver, ISO, and other styles

25

Lepage, Benoit, and Guillaume Painchard-April. "Acoustic Path Filtering for Improved Multimode Total Focusing Method Inspection." Materials Evaluation 81, no. 2 (2023): 38–45. http://dx.doi.org/10.32548/2023.me-04279.

Full text

Abstract:

Total focusing method (TFM) is an ultrasonic testing (UT) technique that provides nondestructive testing (NDT) inspectors with new imaging modes, enabling more accurate detection, sizing, and representation of challenging defects. While TFM may offer convenient, nearly true-to-geometry imagery as the inspection result, it is often detrimentally affected by mode conversion artifacts. Current standards, such as ASME Section V, place the burden on the inspector to explain the origins of those artifacts, impacting the productivity and reliability of the inspection. A method enabling direct control

APA, Harvard, Vancouver, ISO, and other styles

26

Ouédraogo, B., R. Maréchal, J. M. Ville, and E. Perrey-Debain. "Broadband noise reduction by circular multi-cavity mufflers operating in multimodal propagation conditions." Applied Acoustics 107 (June 2016): 19–26. http://dx.doi.org/10.1016/j.apacoust.2016.02.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Zong, Daoming, and Shiliang Sun. "McOmet: Multimodal Fusion Transformer for Physical Audiovisual Commonsense Reasoning." Proceedings of the AAAI Conference on Artificial Intelligence 37, no. 5 (2023): 6621–29. http://dx.doi.org/10.1609/aaai.v37i5.25813.

Full text

Abstract:

Physical commonsense reasoning is essential for building reliable and interpretable AI systems, which involves a general understanding of the physical properties and affordances of everyday objects, how these objects can be manipulated, and how they interact with others. It is fundamentally a multi-modal task, as physical properties are manifested through multiple modalities, including vision and acoustics. In this work, we present a unified framework, named Multimodal Commonsense Transformer (MCOMET), for physical audiovisual commonsense reasoning. MCOMET has two intriguing properties: i) it

APA, Harvard, Vancouver, ISO, and other styles

28

Bi, WenPing, Vincent Pagneux, Denis Lafarge, and Yves Aurégan. "An improved multimodal method for sound propagation in nonuniform lined ducts." Journal of the Acoustical Society of America 122, no. 1 (2007): 280–90. http://dx.doi.org/10.1121/1.2736785.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Gentili, G. G., M. Khosronejad, G. Bernasconi, S. Perotto, and S. Micheletti. "Efficient modeling of multimode guided acoustic wave propagation in deformed pipelines by hierarchical model reduction." Applied Numerical Mathematics 173 (March 2022): 329–44. http://dx.doi.org/10.1016/j.apnum.2021.12.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Núñez, Ismael, and Carlos Negreira. "Efficiency parameters in time reversal acoustics: Applications to dispersive media and multimode wave propagation." Journal of the Acoustical Society of America 117, no. 3 (2005): 1202–9. http://dx.doi.org/10.1121/1.1856272.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Li, Jing. "Tunable Multimode Filtering of Solid Acoustic Waves in a Three-Component Phononic Crystal Slab." Advanced Materials Research 150-151 (October 2010): 1625–39. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1625.

Full text

Abstract:

Using of the multiple scattering methods, we characterize the positive and negative multi-refraction and transmission properties of a solid-based phononic crystal composed of coated solid inclusions in view of its applications in tunable multimode filtering. The geometrical parameters are chosen so that a left-handed longitudinal wave mode and a right-handed transverse wave mode, are simultaneously obtained in this three-component phononic crystal. When multimode Gaussian beams are placed transmitting through the phononic crystal slab, both positive and negative refractions are observed. We th

APA, Harvard, Vancouver, ISO, and other styles

32

Guennoc, Thomas, Jean-Baptiste Doc, and Simon Félix. "Improved multimodal formulation of the wave propagation in a 3D waveguide with varying cross-section and curvature." Journal of the Acoustical Society of America 149, no. 1 (2021): 476–86. http://dx.doi.org/10.1121/10.0003336.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Sugimoto, Rie, R. Jeremy Astley, Claire R. McAleer, and Iansteel Achunche. "A numerical study on multimode sound propagation in lined ducts and radiation to the far field." Journal of the Acoustical Society of America 123, no. 5 (2008): 3128. http://dx.doi.org/10.1121/1.2933070.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Bauer, Adam Q., Christian C. Anderson, Karen R. Marutyan, et al. "Experimental confirmation of negative dispersion and Bayesian inversion of multimode propagation in a bone‐mimicking phantom." Journal of the Acoustical Society of America 123, no. 5 (2008): 3512. http://dx.doi.org/10.1121/1.2934415.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Alleyne, D., and P. Cawley. "A two-dimensional Fourier transform method for the measurement of propagating multimode signals." Journal of the Acoustical Society of America 89, no. 3 (1991): 1159–68. http://dx.doi.org/10.1121/1.400530.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Yang, Minye, Zhilu Ye, Mohamed Farhat, and Pai-Yen Chen. "Cascaded PT-symmetric artificial sheets: multimodal manipulation of self-dual emitter-absorber singularities, and unidirectional and bidirectional reflectionless transparencies." Journal of Physics D: Applied Physics 55, no. 8 (2021): 085301. http://dx.doi.org/10.1088/1361-6463/ac3300.

Full text

Abstract:

Abstract We introduce cascaded parity-time (PT)-symmetric artificial sheets (e.g. metasurfaces or frequency selective surfaces) that may exhibit multiple higher-order laser-absorber modes and bidirectional reflectionless transmission resonances within the PT-broken phase, as well as a unidirectional reflectionless transmission resonance associated with the exceptional point (EP). We derive the explicit expressions of the gain–loss parameter required for obtaining these modes and their intriguing physical properties. By exploiting the cascaded PT structures, the gain–loss threshold for the self

APA, Harvard, Vancouver, ISO, and other styles

37

Raghavan, Ajay, and Carlos E. S. Cesnik. "3-D Elasticity-Based Modeling of Anisotropic Piezocomposite Transducers for Guided Wave Structural Health Monitoring." Journal of Vibration and Acoustics 129, no. 6 (2007): 739–51. http://dx.doi.org/10.1115/1.2748776.

Full text

Abstract:

Anisotropic piezocomposite transducers (APTs), such as macro fiber composites and active fiber composites, have great potential to be used as structurally integrated transducers for guided-wave (GW) structural health monitoring. Their main advantages over conventional monolithic piezoceramic wafer transducers are mechanical flexibility, curved surface conformability, power efficiency, their ability to excite focused GW fields, and their unidirectional sensing capability as a GW sensor. In this paper, models are developed to describe excitation of GW fields by APTs in isotropic structures. The

APA, Harvard, Vancouver, ISO, and other styles

38

Kauffmann, Pierre, Marie-Aude Ploix, Jean-François Chaix, Cécile Gueudre, Gilles Corneloup, and François Baque. "Interferences in the re-emission field of multimodal leaky lamb waves propagating in an immersed plate: Analytical modelling, simulation and experimentation." Journal of Sound and Vibration 465 (January 2020): 115015. http://dx.doi.org/10.1016/j.jsv.2019.115015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Mangin, Bruno, Majd Daroukh, and Gwénaël Gabard. "Propagation of Acoustic Waves in Ducts with Flow Using the Multimodal Formulation." AIAA Journal, March 1, 2023, 1–13. http://dx.doi.org/10.2514/1.j062659.

Full text

Abstract:

This paper presents a multimodal method for the computation of the acoustic field in an axisymmetric varying duct with or without liner and in the presence of mean flow. The original three-dimensional equations are rearranged into a set of coupled one-dimensional equations by projecting the acoustic field over transverse basis functions. To maintain the computational efficiency of the original multimodal method (applicable without flow), only the leading-order effects of the mean flow are modeled using a multiple-scales approach. A matching procedure is also given to deal with liner discontinu

APA, Harvard, Vancouver, ISO, and other styles

40

Sánchez-Orgaz, Eva María, Francisco David Denia, Jose Martínez-Casas, and Javier Carballeira. "Computational approach for the acoustic modelling of large aftertreatment devices with multimodal incident sound fields." Advances in Mechanical Engineering 15, no. 9 (2023). http://dx.doi.org/10.1177/16878132231199870.

Full text

Abstract:

The influence of multimodal incident sound fields on the acoustic behaviour of large aftertreatment devices incorporating a monolith is modelled and analysed in detail. The analytical mode matching method is applied to the compatibility conditions of the three-dimensional acoustic fields at the device geometric discontinuities, leading to the computation of the complex wave amplitudes in all the subdomains involved and the corresponding device transmission loss. To have a realistic model, three-dimensional propagation must be considered in the inlet/outlet ducts and chambers, while one-dimensi

APA, Harvard, Vancouver, ISO, and other styles

41

Song, Xiang, Jingjian Xu, Tianyue Yuan, et al. "An investigation on the modelling of a finite porous liner for the sound propagation in a rectangular duct." Journal of Vibration and Control, December 26, 2022, 107754632211477. http://dx.doi.org/10.1177/10775463221147734.

Full text

Abstract:

Acoustic liners take an essential role in the noise attenuation in ducts. In this work, the multimodal method based on the finite-difference method is extended to predict the acoustic field in a rectangular duct lined with a finite porous material and validated by the experiment. A modified immersed interface method is developed for the air–porous interface problem in the extended multimodal method without flow. When the flow exists, the treatments of the air–porous interface problem and the continuity of pressure between the wall and liner are also given. Three ways of describing the porous l

APA, Harvard, Vancouver, ISO, and other styles

42

Yddal, Torstein, Spiros Kotopoulis, Odd Helge Gilja, and Michiel Postema. "Ultrasound transducers with an optical window." June 17, 2014. https://doi.org/10.5281/zenodo.4891808.

Full text

Abstract:

Ultrasound is one of the most cost-effective deep tissue clinical imaging modalities. Near all ultrasound transducers are fabricated from piezoelectric materials that require metal surface electrodes, making the transducers opaque. With the increasing need for multi-modal and compact imaging and therapeutic tools new transducers fabrication techniques need to be evaluated. In our work we evaluate several designs that allow a large optical window in combination with ultrasonic propagation collinear to the imaging path. Three types of transducers were made based on a stacked design, in two diffe

APA, Harvard, Vancouver, ISO, and other styles

43

Liou, Yi-Ting, Madeleine Msall, Alberto Hernández-Mínguez, and Paulo Ventura Santos. "Spatial analysis of multi-frequency SAW beams excited by slanted IDTs on ZnO-SiC heterostructures." Journal of Physics D: Applied Physics, July 8, 2024. http://dx.doi.org/10.1088/1361-6463/ad600e.

Full text

Abstract:

Abstract Slanted (or fan-shaped) interdigital transducers (IDTs) with broadband response allow the selective excitation of surface acoustic waves (SAWs) with narrow beam widths and pathways controlled by the excitation frequency. Such SAW-based spatial and frequency control is important for applications in microfluidics, as well as in emerging applications in semiconductor nanostructures. In this contribution, we generate both Rayleigh and Sezawa modes with slanted IDTs on a 4H-SiC substrate coated with a piezoelectric ZnO film. We directly measure the phase wavefronts of narrow SAW beams in t

APA, Harvard, Vancouver, ISO, and other styles

44

Wei Wei, Feng Guan, and Xin Fang. "The Integrated Vibration Absorption and Isolation Design Method for Metamaterial Beams Based on Bandgap wave-insulating Vibration Isolatior." Acta Physica Sinica, 2024, 0. http://dx.doi.org/10.7498/aps.73.20241135.

Full text

Abstract:

Advanced vibration control technologies are in high demand for equipment such as aircraft and ships. Currently, most systems separate vibration absorption and isolation design, and existing isolation designs cannot effectively enhance the isolation of low-frequency line spectra. There is an urgent need to develop integrated vibration absorption and isolation designs and enhance low-frequency line spectrum control. In response to this need, this paper focuses on a typical Euler beam and investigates the propagation characteristics of vibrations in both transverse and longitudinal directions, th

APA, Harvard, Vancouver, ISO, and other styles

45

Prasad, Rajan, and Abhijit Sarkar. "Broadband Seismic Isolation of Periodic Ladder Frame Structure." Journal of Vibration and Acoustics 143, no. 1 (2020). http://dx.doi.org/10.1115/1.4047704.

Full text

Abstract:

Abstract Ladder frame structures are used as models for multistorey buildings. These periodic structures exhibit alternating propagating and attenuating frequency bands. Of the six different wave modes of propagation, two modes strongly attenuate at all frequencies. The other four modes have nonoverlapping stop band characteristics. Thus, it is challenging to isolate such structures when subjected to broadband, multimodal base excitation. In this study, we seek to synthesize a periodic ladder frame structure that has attenuation characteristics over the maximal range of frequencies for all the

APA, Harvard, Vancouver, ISO, and other styles

46

Hojo, Emi, Wiraphong Sucharit, Saranya Jaruchainiwat, et al. "Magnetic Resonance Elastography of Upper Trapezius Muscle." NMR in Biomedicine 38, no. 4 (2025). https://doi.org/10.1002/nbm.70007.

Full text

Abstract:

ABSTRACTThe goal of the present study was to investigate the effect of positioning a soft flexible tube‐based actuator parallel or orthogonal to the principle muscle fibre direction, on measurements of the stiffness of upper trapezius (UT) muscle obtained using magnetic resonance elastography (MRE). The effects of using three different vibration frequencies (60 Hz, 80 Hz and 100 Hz) and studying left and right sides of the body were also investigated. The relevant MRE datasets were acquired on a 1.5 T MRI system using a 2D gradient‐echo (GRE) MRE sequence, and corresponding wave images produce

APA, Harvard, Vancouver, ISO, and other styles

47

Dawidowski, David, Richard Nauber, Lars Büttner, and Jürgen Czarske. "Time reversal ultrasound focusing through multimode waveguides." tm - Technisches Messen 84, no. 9 (2017). http://dx.doi.org/10.1515/teme-2016-0062.

Full text

Abstract:

AbstractUltrasound imaging in harsh environments, such as the continuous steel casting process, benefits from a spatial separation of sensors and measuring volume to avoid damaging e.g. because of high temperatures. This can be achieved through acoustical multimode waveguides. To focus ultrasound in the measuring volume despite the complex sound propagation, we propose using the time reversal technique. We present numerical simulations and experiments using the phased array ultrasound Doppler velocimeter to focus through a water filled waveguide with a 64 element array. A resolution in the mil

APA, Harvard, Vancouver, ISO, and other styles

48

Liu, Lei, Xiujuan Zhang, Ming‐Hui Lu, and Yan‐Feng Chen. "Width‐Independent and Robust Multimode Interference Waveguides Based on Anomalous Bulk States." Laser & Photonics Reviews, May 29, 2025. https://doi.org/10.1002/lpor.202500943.

Full text

Abstract:

AbstractMultimode interference (MMI) underpins critical functionalities in wave splitting, filtering, switching, and multiplexing. Conventional MMI waveguides, however, suffer from instability due to their high dependence on waveguide dimensions, particularly the width. Here, width‐independent and robust MMI waveguides using graphene‐inspired Dirac metamaterials are realized. Leveraging lattice symmetry, these materials support anomalous bulk states with uniform wavefunctions through boundary modulation, independent of sample size and robust against material perturbations. Stacking multiple la

APA, Harvard, Vancouver, ISO, and other styles

49

Joglekar, D. M. "Scattering of the Fundamental Lamb Modes in Bent Metallic Plates." Journal of Applied Mechanics, September 15, 2022, 1–32. http://dx.doi.org/10.1115/1.4055619.

Full text

Abstract:

Abstract Guided elastic waves, propagating through curved waveguides, have attracted significant attention in the recent past; both from the perspectives of assessment of structural integrity and generating novel designs of acoustic waveguides. This paper presents investigation of the interaction of the fundamental Lamb modes with a cylindrical bend in thin metallic plates. A hybrid numerical method is exposited which combines the computational efficacy of the Semi Analytical Finite Element method in modeling the long straight portions of the plate and the versatility of the conventional Finit

APA, Harvard, Vancouver, ISO, and other styles

50

Baker, Janet M., and Peter Cariani. "Time-domain brain: temporal mechanisms for brain functions using time-delay nets, holographic processes, radio communications, and emergent oscillatory sequences." Frontiers in Computational Neuroscience 19 (February 18, 2025). https://doi.org/10.3389/fncom.2025.1540532.

Full text

Abstract:

Time is essential for understanding the brain. A temporal theory for realizing major brain functions (e.g., sensation, cognition, motivation, attention, memory, learning, and motor action) is proposed that uses temporal codes, time-domain neural networks, correlation-based binding processes and signal dynamics. It adopts a signal-centric perspective in which neural assemblies produce circulating and propagating characteristic temporally patterned signals for each attribute (feature). Temporal precision is essential for temporal coding and processing. The characteristic spike patterns that cons

APA, Harvard, Vancouver, ISO, and other styles

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