# the radiation of sound from vibrating composite membranes

##### The radiation of sound from vibrating composite

The radiation of sound from vibrating composite membranes Sasadhar De 1 pure and applied geophysics volume 97 , pages 85–91 ( 1972 ) Cite this article

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##### Vibrations of and sound radiation from sandwich plates in ...

2000-4-1 · The Hamiltonian of a vibrating composite plate undergoing cylindrical bending (a composite beam) is (1) H= 1 2 ∫ t 1 t 2 ∫ 0 l m(w ̇) 2 +I 1 (w ̇ ′) 2 +I 2 θ ̇ 2 −M 1 κ 1 −M 2 κ 2 −Qτ d x d t. Here the first term m(w ̇) 2 is a sum of kinetic energies of all plies in their vertical motion, the second and the third ones are ...

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##### Discrete material optimization of vibrating laminated ...

2010-8-1 · The total sound power radiation from the vibrating laminated composite plates is generally significantly decreased by the discrete material optimization. To minimize the sound radiation, the optimization has either driven the nearest resonance frequency as far away as possible from the prescribed excitation frequency, or has increased the gap ...

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##### Vibrations of and sound radiation from sandwich plates in ...

In this paper, the attention is focused at a comparatively low frequency band with the special reference to long travelling waves which as it is well-known [1] produce an efficient radiation of sound from vibrating structure. The governing equations of the sixth order [11] are adopted for a simple beam of the sandwich composition.

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##### Vibration and sound radiation of an asymmetric laminated ...

2015-2-1 · Analytical studies on the vibration and sound radiation characteristics of an asymmetric laminated rectangular plate are carried out in this paper. Theoretical formulations, in which the effects of thermal environments are taken into account, are derived for the vibration and sound radiation based on both first-order shear deformation plate ...

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##### Free vibration of composite membranes with arbitrary

1985-5-8 · 13. V. VODItKA 1963 Czechoslovak Journal of Physics 13, 493-498. On forced vibrations of composite circular membrane. 14. S. DE 1971 Journal of Sound and Vibration 17, 13-23. Vibration of a composite annular membrane. 15. S. DE 1972 Pure and Applied Geophysics 97, 85-91. The radiation of sound from vibrating composite membranes. 16.

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##### (PDF) Sound Radiation due to Modal Vibrations of a ...

Radiation of sound from a spherical source, vibrating with an arbitrary, axisymmetric, time-harmonic surface velocity, while positioned within an

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##### OF RAINBOWS AND DRUMS AN INVITATION TO

2014-11-6 · electromagnetic waves in electromagnetic radiation, and even more broadly to the frequencies in composites of waves of all kinds, for example in sound. Figure 1. Illustration of the Prism Experiment in Newton’s Opticks1. Article for Penn State Altoona’s Research and Teaching Magazine (Version: November 5, 2014).

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##### (PDF) Sound-wave propagation in a membrane-duct (L)

supersonic waves are found and the sound wave propagates. through the duct without any signiﬁcant dissipation. 4. In what follows, the frequency

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##### Sound Radiation and Vibration of Composite Panels

The present study investigates the vibration and sound radiation by panels exited by turbulent flow and by random noise. Composite and aluminum panels are analyzed through a developed analytical framework. The main objective of this study is to identify the difference between the vibroacoustic behaviour of these two types of panels. This topic is of particular importance,

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##### (PDF) Numerical computation of the sound radiation from

A sound radiation calculation method by using dominant modes is proposed to predict the sound radiation from a cylindrical shell. This method can provide an effective way to quickly predict the ...

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##### OF RAINBOWS AND DRUMS AN INVITATION TO

2014-11-6 · electromagnetic waves in electromagnetic radiation, and even more broadly to the frequencies in composites of waves of all kinds, for example in sound. Figure 1. Illustration of the Prism Experiment in Newton’s Opticks1. Article for Penn State Altoona’s Research and Teaching Magazine (Version: November 5, 2014).

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##### (PDF) Sound-wave propagation in a membrane-duct (L)

supersonic waves are found and the sound wave propagates. through the duct without any signiﬁcant dissipation. 4. In what follows, the frequency characteristics of waves. in a membrane – duct ...

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##### On the sound field of an oscillating disk in a finite open ...

2005-9-9 · J. Pachner, “ On the acoustical radiation of an emitter vibrating freely or in a wall of finite dimensions,” J. Acoust. Soc. Am. 23(2), 198– 208 (1951). Google Scholar Scitation; 11. P. H. G. Crane, “ Method for the calculation of the acoustic radiation impedance of unbaffled and partially baffled piston sources,” J. Sound Vib. 5(2 ...

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##### Mathematical Modelling and Acoustical Analysis of ...

2016-11-14 · However, radiation, defined as the sound pressure per unit force, at the front of the instrument, remained relatively constant and peaked at 0.7 Pa/N. Perry and Richardson reinvestigated this instrument and found that the radiation efficiency dropped from 0.67 at 345 Hz to 0.10 at 458 Hz.

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##### 1 FUNDAMENTALS OF ACOUSTICS - WHO

of sound spectra, the example of a vibrating piston at the end of a very long tube filled with air will be used, as illustrated in Figure 1.3 Let the piston in Figure 1.3 move forward. Since the air has inertia, only the air immediately

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##### Dan Russell's Acoustics and Vibration Animations

2021-2-23 · The links below contain animations illustrating acoustics and vibration, waves and oscillation concepts. I started using Mathematica to create animations to help me understand and visualize certain acoustics and vibration phenomena in

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##### Transient modal radiation of axisymmetric sources ...

So far, the sound radiation of flat vibrating pistons, membranes and plates, circular, rectangular, elliptical and annular was considered in detail in [1] [2] [3][4][5][6][7][8][9][10][11][12][13 ...

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##### (PDF) Multilayer graphene condenser microphone

Vibrating membranes are the cornerstone of acoustic technology, forming the backbone of modern loudspeakers and microphones. Acoustic performance of a condenser microphone is derived mainly from ...

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##### (PDF) Discrete material optimization of vibrating ...

Discrete material optimization of vibrating laminated composite plates for minimum sound radiation International Journal of Solids and Structures, 2010 Niels Olhoff

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##### Materials | Free Full-Text | Sound Radiation Analysis of ...

2019-9-20 · Constrained layer damping (CLD) is an effective method for suppressing the vibration and sound radiation of lightweight structures. In this article, a two-level optimization approach is presented as a systematic methodology to design position layouts and thickness configurations of CLD materials for suppressing the sound power of vibrating structures.

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##### NUMERICAL COMPUTATION OF THE SOUND RADIATION

2020-11-29 · numerical computation of the sound radiation from a planar baffled vibrating surface JORGE P. ARENAS Institute of Acoustics, Universidad Austral de Chile, Campus Miraflores, Edificio 6000, P.O. Box 567, Valdivia, Chile

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##### Passive, remote and omnidirectional suppression of sound ...

2021-10-6 · [1] Fahy F and Gardonio P 2007 Sound and Structural Vibration (New York: Academic) Sound radiation by vibrating structures 135–241. Go to reference in article Crossref Google Scholar [2] Xiao T, Qiu X and Halkon B 2020 Ultra-broadband local active noise control with remote acoustic sensing Sci. Rep. 10 20784. Go to reference in article ...

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##### OF RAINBOWS AND DRUMS AN INVITATION TO

2014-11-6 · electromagnetic waves in electromagnetic radiation, and even more broadly to the frequencies in composites of waves of all kinds, for example in sound. Figure 1. Illustration of the Prism Experiment in Newton’s Opticks1. Article for Penn State Altoona’s Research and Teaching Magazine (Version: November 5, 2014).

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##### On the modeling of sound radiation from poroelastic ...

2006-10-6 · Examples include (i) the evaluation of the diffuse field sound absorption coefficient of a porous material and/or the sound transmission loss of an elastic plate coupled to a porous sheet, (ii) the assessment of the acoustic radiation damping of a porous material coupled to a vibrating structure. The latter is particularly important for the ...

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##### Theoretical and experimental analysis of the ...

Sound directivity control is made possible by a compact array of independent loudspeakers operating at the same frequency range. The drivers are usually distributed over a sphere-like frame according to a Platonic solid geometry to obtain a highly symmetrical configuration. The radiation pattern of

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##### Optimization of Boundary Supports for Sound Radiation ...

2007-11-12 · The purpose of this research is to design optimal boundary supports for minimum structural sound radiation. The influence of the boundary conditions on the structural dynamics of a cantilever beam is first examined to motivate the research.

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##### Wood for sound - Wiley Online Library

2006-10-1 · The initial four classes were (1) idiophones—instruments that make sound primarily by vibrating themselves, without the use of membranes or strings (e.g., xylophones); (2) membranophones—instruments that use a stretched membrane to create the sound e.g., drums); (3) chordophones—instruments that rely on a stretched string (e.g., violins ...

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##### Principles of Vibration and Sound | SpringerLink

The second part of the book discusses the propagation of sound in air, including radiation, transmission, absorption, and diffraction. This treatment of radiation covers point, dipole, line, plane and other sources, both with and without baffles, and the propagation of sound in various kinds and shapes of pipes, horns and other acoustics ...

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