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Relevant bibliographies by topics / Nonlinean acoustics

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Academic literature on the topic 'Nonlinean acoustics'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Nonlinean acoustics"

1

Shao, Jianwang, Tao Zeng, and Xian Wu. "Study of a Nonlinear Membrane Absorber Applied to 3D Acoustic Cavity for Low Frequency Broadband Noise Control." Materials 12, no. 7 (April 8, 2019): 1138. http://dx.doi.org/10.3390/ma12071138.

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As a new approach to passive noise control in low frequency domain, the targeted energy transfer (TET) technique has been applied to the 3D fields of acoustics. The nonlinear membrane absorber based on the TET can reduce the low frequency noise inside the 3D acoustic cavity. The TET phenomenon inside the 3D acoustic cavity has firstly investigated by a two degrees-of-freedom (DOF) system, which is comprised by an acoustic mode and a nonlinear membrane without the pre-stress. In order to control the low frequency broadband noise inside 3D acoustic cavity and consider the influence of the pre-stress for the TET, a general model of the system with several acoustic modes of 3D acoustic cavity and one nonlinear membrane is built and studied in this paper. By using the harmonic balance method and the numerical method, the nonlinear normal modes and the forced responses are analyzed. Meanwhile, the influence of the pre-stress of the nonlinear membrane for the TET is investigated. The desired working zones of the nonlinear membrane absorber for the broadband noise are investigated. It can be helpful to design the nonlinear membrane according the dimension of 3D acoustic cavity to control the low frequency broadband noise.

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Klepka, Andrzej, Wieslaw Jerzy Staszewski, T. Uhl, Dario di Maio, Fabrizio Scarpa, and K. F. Tee. "Impact Damage Detection in Composite Chiral Sandwich Panels." Key Engineering Materials 518 (July 2012): 160–67. http://dx.doi.org/10.4028/www.scientific.net/kem.518.160.

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This paper demonstrates impact damage detection in a composite sandwich panel. The panel is built from a chiral honeycomb and two composite skins. Chiral structures are a subset of auxetic solids exhibiting counterintuitive deformation mechanism and rotative but not reflective symmetry. Damage detection is performed using nonlinear acoustics,involves combined vibro-acoustic interaction of high-frequency ultrasonic wave and low-frequency vibration excitation. High-and low-frequency excitations are introduced to the panel using a low-profile piezoceramic transducer and an electromagnetic shaker, respectively. Vibro-acoustic modulated responses are measured using laser vibrometry. The methods used for impact damage detection clearly reveal de-bonding in the composite panel. The high-frequency weak ultrasonic wave is also modulated by the low-frequency strong vibration wave when nonlinear acoustics is used for damage detection. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal.

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Lee. "Underwater Acoustic Communication Using Nonlinear Chirp Signal." Journal Of The Acoustical Society Of Korea 33, no. 4 (2014): 255. http://dx.doi.org/10.7776/ask.2014.33.4.255.

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Włodarska, Dorota, Andrzej Klepka, Wieslaw Jerzy Staszewski, and Tadeusz Uhl. "Comparative Study of Instantaneous Frequency Extraction in Nonlinear Acoustics Used for Structural Damage Detection." Key Engineering Materials 588 (October 2013): 33–42. http://dx.doi.org/10.4028/www.scientific.net/kem.588.33.

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Nonlinear acoustics deals with various nonlinear effects that occur in ultrasonic wave propagation. The method is suitable for material characterisation, as it uses different nonlinear phenomena associated with material imperfections. The method has been used for detecting nonlinearities in cracked solids by: measuring distortions of acoustic signals, estimating resonance frequency shifts or assessing nonlinear vibro-acosutic modulations. The latter is the most widely used non-classical approach to probe material nonlinearities. The method involves vibro-acoustic interactions of ultrasonic wave and modal vibration in damaged specimens. Modulation intensity that strongly relates to damage severity - is usually assessed in the frequency domain and often leads to confusing results when large modulations are involved. The paper investigates the time domain analysis of vibro-acoustic modulated signals. Several methods for instantaneous frequency calculation used to assess the intensity of modulation - are compared. Simulated and experimental data are used in these investigations.

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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 (November 5, 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 index, the transformed medium in the coupler can become a simplified parameter medium, for which the bulk modulus is a constant. This makes the experiment substantially easier. The problem of a reduced coupling-efficiency at low frequencies (a deviation from the geometric acoustic approximation) can be mitigated by selecting a large acoustic refractive index. Our two-dimensional numerical simulations indicate that this theoretical design works very well. The method can be extended to other transformation acoustic designs including three-dimensional cases.

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Muir, Thomas G., David G. Browning, and Kenneth G. Foote. "Nonlinear acoustics and the Acoustical Society of America." Journal of the Acoustical Society of America 138, no. 3 (September 2015): 1842. http://dx.doi.org/10.1121/1.4933864.

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Pazini Brandao, Mauricio. "Nonlinear acoustics—Coupling between hydrodynamic and acoustic pressure fields." Journal of the Acoustical Society of America 112, no. 5 (November 2002): 2215. http://dx.doi.org/10.1121/1.4778740.

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WALSH, TIMOTHY, and MONICA TORRES. "FINITE ELEMENT METHODS FOR NONLINEAR ACOUSTICS IN FLUIDS." Journal of Computational Acoustics 15, no. 03 (September 2007): 353–75. http://dx.doi.org/10.1142/s0218396x0700338x.

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In this paper, weak formulations and finite element discretizations of the governing partial differential equations of three-dimensional nonlinear acoustics in absorbing fluids are presented. The fluid equations are considered in an Eulerian framework, rather than a displacement framework, since in the latter case the corresponding finite element formulations suffer from spurious modes and numerical instabilities. When taken with the governing partial differential equations of a solid body and the continuity conditions, a coupled formulation is derived. The change in solid/fluid interface conditions when going from a linear acoustic fluid to a nonlinear acoustic fluid is demonstrated. Finite element discretizations of the coupled problem are then derived, and verification examples are presented that demonstrate the correctness of the implementations. We demonstrate that the time step size necessary to resolve the wave decreases as steepening occurs. Finally, simulation results are presented on a resonating acoustic cavity, and a coupled elastic/acoustic system consisting of a fluid-filled spherical tank.

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Molevich, Nonna E., Anatoly I. Klimov, and Vladimir G. Makaryan. "Influence of Thermodynamic Nonequilibrium on the Acoustic Properties of Gases." International Journal of Aeroacoustics 4, no. 3 (July 2005): 373–83. http://dx.doi.org/10.1260/1475472054771411.

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This paper is a brief review of results of experimental and theoretical studies in the field of acoustics of nonequilibrium gas-plasma media. New acoustical properties of nonequilibrium media caused by the change in sign of the second viscosity and the dispersion coefficients are considered. Such media are acoustically active. Conditions are discussed for generating new nonlinear acoustical structures.

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Abbasov, Iftikhar B. "A research and modeling of wave processes at the scattering of nonlinear acoustic waves on cylindrical bodies." International research journal of engineering, IT & scientific research 5, no. 5 (September 30, 2019): 32–44. http://dx.doi.org/10.21744/irjeis.v5n5.779.

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The article is devoted to the study of the scattering of nonlinear acoustic waves on cylindrical bodies. There was made a review of publications on the scattering of acoustic waves by inhomogeneities of the medium in the form of cylindrical bodies and shells. There were noted features of the small parameter method application in nonlinear acoustics. A three-dimensional model of the geometry of the problem in cylindrical coordinates was presented, nonlinear wave processes occurring between the falling plane and scattered cylindrical waves were described. The inhomogeneous wave equation is solved by the method of successive approximations of series expansion in a small parameter. An asymptotic expression for the acoustic pressure of a difference-frequency wave was obtained. A program for calculating scattering diagrams has been developed, and an algorithm for its operation is given. The acoustic pressure scattering diagram of a differential frequency wave on a rigid cylinder and its three-dimensional model are presented. The radius of convergence of the used method of expansion in a small parameter is determined.

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Dissertations / Theses on the topic "Nonlinean acoustics"

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Edgerton, James Becton. "Finite amplitude acoustic waves generated by a baffled, multiharmonic transducer." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/17898.

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Shi, Kun. "Nonlinear acoustic echo cancellation." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26704.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.
Committee Chair: G. Tong Zhou; Committee Co-Chair: Xiaoli Ma; Committee Member: David V. Anderson; Committee Member: James Stevenson Kenney; Committee Member: Liang Peng; Committee Member: William D. Hunt. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Ajaz, Mahnoor. "Finite Difference Time Domain Modelling of Ultrasonic Parametric Arrays in Two-Dimensional Spaces." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1619109761801613.

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Kumon, Ronald Edward. "Nonlinear surface acoustic waves in cubic crystals /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Cates, Andrew Thomas. "Nonlinear diffractive acoustics." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315809.

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Jackson, Edward James. "Modelling and monitoring nonlinear acoustic phenomena in high-intensity focused ultrasound therapy." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:cea762cf-8a12-4265-b1b1-a15214c58ac3.

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High intensity focused ultrasound (HIFU) provides a wide range of noninvasive therapies ranging from drug delivery to the destruction of kidney stones. In particular, thermal ablation by HIFU presents an effective noninvasive method for the treatment of deep seated solid tumours. HIFUâs further uptake is limited by a need for improved treatment planning and monitoring. Two nonlinear acoustic phenomena that play key roles in HIFU treatment: finite amplitude effects that lead to the generation of harmonics and steepening of wavefronts, and acoustic cavitation. The former must be taken into careful consideration for treatment planning purposes, while the latter has the potential to provide fast, real-time, cost effective treatment monitoring. The first half of this thesis provides new measurements for the nonlinear acoustic properties of tissue, assesses the validity of two common modelling techniques for simulating HIFU fields. The second half develops a new method for combining passive acoustic mapping- an ultrasound monitoring technique- with MR thermometry, to assess estimates of cavitation enhanced heating derived from passive acoustic maps. In the first results chapter B/A was measured in ex-vivo bovine liver, over a heating/ cooling cycle replicating temperatures reached during HIFU ablation, adapting a finite amplitude insertion technique (FAIS), which also allowed for measurement of sound-speed and attenuation. The method measures the nonlinear progression of a plane-wave through liver and B/A was chosen so that numerical simulations matched measured waveforms. Results showed that attenuation initially decreased with heating then increased after denaturation, sound-speed initially increased with temperature and then decreased, and B/A showed an increase with temperature but no significant post-heating change. These data disagree with other reports that show a significant change and suggest that any nonlinear enhancement in the received ultrasound signal post-treatment is likely due to acoustic cavitation rather than changes in tissue nonlinearity. In the second results chapter two common methods of modelling HIFU fields were compared with hydrophone measurements of nonlinear HIFU fields at a range of frequencies and pressures. The two methods usedwere the KZK equation and the commercial package PZFlex. The KZK equation has become the standard method for modelling focused fields, while the validity of PZFlex for modelling these types of transducers is unclear. The results show that the KZK equation is able to match hydrophone measurements, but that PZFlex underestimates the magnitude of the harmonics. Higher order harmonics in PZFlex are not the correct shape, and do not peak around the focus. PZFlex performs worse at higher pressures and frequencies, and should be used with caution. In the final two chapters a system for estimating cavitation-enhanced heating from acoustic maps is developed and benchmarked against magnetic resonance thermometry methods. The first chapter shows that the ultrasound and MR monitoring systems are compatible, and registers the two imaging systems. The HIFUfocus is clearly visible in passive maps acquired in the absence of cavitation and these coincide with the centre of heating in MR temperature images. When cavitation occurs, it coincides spatially and temporally with the appearance of a clear spike in temperature, especially when the passive maps are processed using the Robust Capon Beamformer algorithm. The final chapter shows how passive maps can be converted into thermal heating inputs, and used to estimate cavitation-enhanced temperature increases. These estimates have the potential to closely match maximum temperature rise, and estimated thermal dose after the estimated temperature rise is spatially averaged. However, themethod is not always successful. This is partly due to uncertainties in MR thermometry estimates, partly due to uncertainties in the acoustic properties of tissue.

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Shepherd, Micah Raymond. "The Effect of Nonlinear Propagation on Near-field Acoustical Holography." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2072.pdf.

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Rendón, Pablo Luis. "Problems in nonlinear acoustics." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621365.

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Nene, Mduduzi Bethuel. "Solid-gas in nonlinear acoustics." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/31591.

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This dissertation is concerned with aspects of the newly-proposed approach to nonlinear acoustics in which the Lagrangian description of gas motion is followed. It contains a systematic survey of the approach which leads to the so-called dynamic piston problem. Then new situations regarding the piston problem are studied. These situations cover cases of varying applied pressure and results concerning the formation of shock discontinuities are presented.
Dissertation (MSc)--University of Pretoria, 2013.
Mathematics and Applied Mathematics
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Bódai, Tamás. "Nonlinear ray dynamics in underwater acoustics." Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2008. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25875.

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Books on the topic "Nonlinean acoustics"

1

Beyer, Robert T. Nonlinear acoustics. Woodbury, NY: Acoustical Society of America, 1997.

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Naugolʹnykh, K. A. Nonlinear wave processes in acoustics. New York: Cambridge University Press, 1998.

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International Symposium on Nonlinear Acoustics (12th 1990 Austin, Tex.). Frontiers of nonlinear acoustics. London: Elsevier Applied Science, 1990.

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Novikov, B. K. Nonlinear underwater acoustics. New York: American Institute of Physics, 1987.

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D, Sette, and Società italiana di fisica, eds. Frontiers in physical acoustics: Varenna on Lake Como, Villa Monastero, 10-20 July 1984. Amsterdam: North-Holland, 1986.

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Italy), International School of Physical Acoustics (4th 1991. Acoustic sensing and probing: Fourth course of the International School on Physical Acoustics, 3-10 October 1991, Erice, Italy. Singapore: World Scientific, 1992.

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Engelbrecht, Professor Jüri. Nonlinear Waves in Active Media. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989.

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8

M, Hedberg Claes, ed. Theory of nonlinear acoustics in fluids. Dordrecht: Kluwer Academic Publishers, 2002.

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Abbasov, Iftikhar Balakishi ogly. Rassei︠a︡nie nelineĭno vzaimodeĭstvui︠u︡shchikh akusticheskikh voln: Sfera, t︠s︡ilindr, sferoid. Moskva: Fizmatlit/Fizmatlit (Russia/Moskva), 2007.

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A, Ostrovskiĭ L., and Gaponov-Grekhov A. V, eds. Nelineĭnye volnovye prot͡s︡essy v akustike. Moskva: "Nauka", 1990.

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Book chapters on the topic "Nonlinean acoustics"

1

Lauterborn, Werner. "Nonlinear Acoustics and Acoustic Chaos." In Lecture Notes in Physics, 265–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45880-8_10.

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Garrett, Steven L. "Nonlinear Acoustics." In Understanding Acoustics, 813–72. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49978-9_15.

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Garrett, Steven L. "Nonlinear Acoustics." In Understanding Acoustics, 701–53. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_15.

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Abstract A fundamental assumption of linear acoustics is that the presence of a wave does not have an influence on the properties of the medium through which it propagates. By extension, the assumption of linearity also means that a waveform is stable since any individual wave does not interact with itself. Small modifications in the sound speed due to wave-induced fluid convection (particle velocity) and to the wave’s effect on sound speed through the equation of state can lead to effects that could not be predicted within the limitations imposed by the assumption of linearity. Although a wave’s influence on the propagation speed may be small, those effects are cumulative and create distortion that can produce shocks. These are nonlinear effects because the magnitude of the nonlinearity’s influence is related to the square of an individual wave’s amplitude (self-interaction) or the product of the amplitudes of two interacting waves (intermodulation distortion). In addition, the time-average of an acoustically induced disturbance may not be zero. Sound waves can exert forces that are sufficient to levitate solid objects against gravity. The stability of such levitation forces will also be examined along with their relation to resonance frequency shifts created by the position of the levitated object.

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Pierce, Allan D. "Nonlinear Effects in Sound Propagation." In Acoustics, 649–709. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11214-1_11.

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Cho, Younho, and Weibin Li. "Nonlinear Acoustics." In Handbook of Advanced Nondestructive Evaluation, 251–69. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-26553-7_36.

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Klepka, Andrzej. "Nonlinear Acoustics." In Advanced Structural Damage Detection, 73–107. Chichester, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118536148.ch4.

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Hirao, Masahiko, and Hirotsugu Ogi. "Nonlinear Acoustics." In EMATs for Science and Industry, 193–96. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3743-1_9.

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Rudenko, O. V. "Nonlinear Acoustics." In Formulas of Acoustics, 1142–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-07296-7_18.

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Crighton, D. G., A. P. Dowling, J. E. Ffowcs Williams, M. Heckl, and F. G. Leppington. "Nonlinear Acoustics." In Modern Methods in Analytical Acoustics, 648–70. London: Springer London, 1992. http://dx.doi.org/10.1007/978-1-4471-0399-8_24.

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Cho, Younho, and Weibin Li. "Nonlinear Acoustics." In Handbook of Advanced Non-Destructive Evaluation, 1–19. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-30050-4_36-1.

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Conference papers on the topic "Nonlinean acoustics"

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Dos Santos, Serge, Mathieu Domenjoud, Camille Plag, Bengt Enflo, Claes M. Hedberg, and Leif Kari. "Symmetry Analysis applied to Nonlinear Acoustics : Principle and application for Acoustic Signal Processing." In NONLINEAR ACOUSTICS - FUNDAMENTALS AND APPLICATIONS: 18th International Symposium on Nonlinear Acoustics - ISNA 18. AIP, 2008. http://dx.doi.org/10.1063/1.2956261.

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Flytzanis, Christos, Bengt Enflo, Claes M. Hedberg, and Leif Kari. "Merging Nonlinear Acoustics and Optics : Light Driven Large Amplitude Short Acoustic Pulses and Breakdown in Dielectrics." In NONLINEAR ACOUSTICS - FUNDAMENTALS AND APPLICATIONS: 18th International Symposium on Nonlinear Acoustics - ISNA 18. AIP, 2008. http://dx.doi.org/10.1063/1.2956263.

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Bellizzi, Sergio, Bruno Cochelin, Philippe Herzog, Pierre-Olivier Matte´i, and Ce´dric Pinhe`de. "Experimental Investigation of Low Frequency Noise Reduction Using a Nonlinear Vibroacoustic Absorber." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47431.

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This work deals with the energy pumping phenomenon for acoustical applications. The concept of energy pumping is to passively reduce the vibrations of a primary system by attaching to it an essentially nonlinear damped oscillator also named Nonlinear Energy Sink (NES) creating a strongly nonlinear coupling which localizes and dissipates the vibrational energy. In the context of acoustics, a vibroacoustic coupling is used. In an earlier work, we showed experimentally that a loudspeaker used as a Suspended Piston (SP) working outside its range of linearity can be used as a NES. In this work, the performance and efficiency of a SP NES is studied numerically and experimentally. The considered acoustic medium is a resonant pipe. The coupling between the pipe and the NES is ensured acoustically by a small acoustic compliance (the air in a coupling box). Various observed aspects of energy pumping are presented: behavior under sinusoidal forcing, pumping threshold, resonance capture and transient response. As a SP NES technology permits an easy control of the moving mass of the NES, the effect of this parameter is also studied.

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Nair, Nirmal J., and Utsav Shah. "A Simple Computational Tool for Studying Acoustic Waves in Nonlinear Medium." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67892.

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The behaviour of acoustic waves in nonlinear medium is well established in literature. But there is a need of a simple computational tool through which practical problems pertaining to nonlinear acoustics can be treated with minimum effort and expense. Additionally, visualization of nonlinear acoustic waves can be useful towards the applications of acoustic diodes and ultrasonic waves. To address this issue, we have developed a numerical scheme which effectively captures the self-distortion mechanism of acoustic wave in nonlinear medium and the consequential generation of higher harmonics. Additionally, the effects of increasing non-linearity constant of the medium and amplitude of sound waves on distortion of the waveform is studied.

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Zhao, Yun, Xinwu Zeng, and Zhangfu Tian. "Acoustic agglomeration of fine particles based on a high intensity acoustical resonator." In RECENT DEVELOPMENTS IN NONLINEAR ACOUSTICS: 20th International Symposium on Nonlinear Acoustics including the 2nd International Sonic Boom Forum. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4934430.

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Stiller, Birgit, Moritz Merklein, Christopher Poulton, Khu Vu, Pan Ma, Stephen J. Madden, and Benjamin J. Eggleton. "Frequency preserving coherent opto-acoustic storage." In Nonlinear Photonics. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/np.2018.npth1h.4.

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Petrie, Owen, and Edward J. Brambley. "Nonlinear Acoustics in a Viscothermal Boundary Layer over an Acoustic Lining." In 23rd AIAA/CEAS Aeroacoustics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-3376.

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Stiller, B. "Waveguide optomechanics – coherent control of acoustic waves." In Nonlinear Photonics. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/np.2020.npw1d.1.

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Naugolnykh, K., Bengt Enflo, Claes M. Hedberg, and Leif Kari. "50 years of nonlinear acoustics." In NONLINEAR ACOUSTICS - FUNDAMENTALS AND APPLICATIONS: 18th International Symposium on Nonlinear Acoustics - ISNA 18. AIP, 2008. http://dx.doi.org/10.1063/1.2956242.

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Söderholm, Lars H., Bengt Enflo, Claes M. Hedberg, and Leif Kari. "Consistent Third Order Nonlinear Acoustics." In NONLINEAR ACOUSTICS - FUNDAMENTALS AND APPLICATIONS: 18th International Symposium on Nonlinear Acoustics - ISNA 18. AIP, 2008. http://dx.doi.org/10.1063/1.2956304.

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Reports on the topic "Nonlinean acoustics"

1

Muhlestein, Michael, and Carl Hart. Geometric-acoustics analysis of singly scattered, nonlinearly evolving waves by circular cylinders. Engineer Research and Development Center (U.S.), October 2020. http://dx.doi.org/10.21079/11681/38521.

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Geometric acoustics, or acoustic ray theory, is used to analyze the scattering of high-amplitude acoustic waves incident upon rigid circular cylinders. Theoretical predictions of the nonlinear evolution of the scattered wave field are provided, as well as measures of the importance of accounting for nonlinearity. An analysis of scattering by many cylinders is also provided, though the effects of multiple scattering are not considered. Provided the characteristic nonlinear distortion length is much larger than a cylinder radius, the nonlinear evolution of the incident wave is shown to be of much greater importance to the overall evolution than the nonlinear evolution of the individual scattered waves.

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Blackstock, David T. Research in Nonlinear Acoustics. Fort Belvoir, VA: Defense Technical Information Center, July 1986. http://dx.doi.org/10.21236/ada172634.

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Odom, Robert I. Nonlinear Inversion from Nonlinear Filters for Ocean Acoustics. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612664.

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Odom, Robert I. Nonlinear Inversion from Nonlinear Filters for Ocean Acoustics. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada573392.

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Hart, Carl R., and Gregory W. Lyons. A Measurement System for the Study of Nonlinear Propagation Through Arrays of Scatterers. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38621.

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Various experimental challenges exist in measuring the spatial and temporal field of a nonlinear acoustic pulse propagating through an array of scatterers. Probe interference and undesirable high-frequency response plague typical approaches with acoustic microphones, which are also limited to resolving the pressure field at a single position. Measurements made with optical methods do not have such drawbacks, and schlieren measurements are particularly well suited to measuring both the spatial and temporal evolution of nonlinear pulse propagation in an array of scatterers. Herein, a measurement system is described based on a z-type schlieren setup, which is suitable for measuring axisymmetric phenomena and visualizing weak shock propagation. In order to reduce directivity and initiate nearly spherically-symmetric propagation, laser induced breakdown serves as the source for the nonlinear pulse. A key component of the schlieren system is a standard schliere, which allows quantitative schlieren measurements to be performed. Sizing of the standard schliere is aided by generating estimates of the expected light refraction from the nonlinear pulse, by way of the forward Abel transform. Finally, considerations for experimental sequencing, image capture, and a reconfigurable rod array designed to minimize spurious wave interactions are specified. 15.

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Muhlestein, Michael, and Carl Hart. Numerical analysis of weak acoustic shocks in aperiodic array of rigid scatterers. Engineer Research and Development Center (U.S.), October 2020. http://dx.doi.org/10.21079/11681/38579.

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Nonlinear propagation of shock waves through periodic structures have the potential to exhibit interesting phenomena. Frequency content of the shock that lies within a bandgap of the periodic structure is strongly attenuated, but nonlinear frequency-frequency interactions pumps energy back into those bands. To investigate the relative importance of these propagation phenomena, numerical experiments using the Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation are carried out. Two-dimensional propagation through a periodic array of rectangular waveguides is per-formed by iteratively using the output of one waveguide as the input for the next waveguide. Comparison of the evolution of the initial shock wave for both the linear and nonlinear cases is presented.

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Ioup, George E., Juliette W. Ioup, Germana Peggion, Martin J. Guillot, J. A. McCorquodale, and Ioannis Y. Georgiou. Ocean and Coastal Modeling: Nonlinear Acoustic Propagation. Fort Belvoir, VA: Defense Technical Information Center, March 2009. http://dx.doi.org/10.21236/ada497838.

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Yang, Jinkyu, and Chiara Daraio. Nonlinear Acoustic Metamaterials for Sound Attenuation Applications. Fort Belvoir, VA: Defense Technical Information Center, March 2011. http://dx.doi.org/10.21236/ada539264.

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Kassoy, D. R. Nonlinear, Rotational-Acoustic Processes in Solid Rocket Engines. Fort Belvoir, VA: Defense Technical Information Center, June 1997. http://dx.doi.org/10.21236/ada329605.

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Hamilton, Mark F. Problems in Nonlinear Acoustics: Rayleigh Waves, Pulsed Sound Beams, and Waveguides. Fort Belvoir, VA: Defense Technical Information Center, August 1993. http://dx.doi.org/10.21236/ada274587.

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