scholarly journals Vibroacoustic response of panels under diffuse acoustic field excitation from sensitivity functions and reciprocity principles

2017 ◽  
Vol 141 (6) ◽  
pp. 4508-4521 ◽  
Author(s):  
Christophe Marchetto ◽  
Laurent Maxit ◽  
Olivier Robin ◽  
Alain Berry
Keyword(s):  
Acoustic Field ◽  
Sensitivity Functions ◽  
Field Excitation ◽  
Vibroacoustic Response

On optimal acoustic field excitation in oceanic waveguides

2016 ◽  
Vol 62 (6) ◽  
pp. 729-740 ◽  
Author(s):  
I. P. Smirnov ◽  
A. I. Khil’ko ◽  
V. G. Burdukovskaya
Keyword(s):  
Acoustic Field ◽  
Oceanic Waveguides ◽  
Field Excitation

scholarly journals EXPERIMENTAL INVESTIGATION OF ACOUSTIC FIELD INFLUENCE FOR AEROSOLS PARTICLES / AKUSTINIO LAUKO ĮTAKOS AEROZOLIO DALELIŲ KOAGULIACIJAI EKSPERIMENTINIAI TYRIMAI

2016 ◽  
Vol 7 (6) ◽  
pp. 609-612
Author(s):  
Ina Tetsman ◽  
Irina Grinbergienė
Keyword(s):  
Experimental Investigation ◽  
Acoustic Field ◽  
Sound Pressure ◽  
Particle Diameter ◽  
Particle Coagulation ◽  
Experimental Stand ◽  
Coagulation Of Particles ◽  
Field Excitation ◽  
Field Sound ◽  
Field Influence

There were made tests of particulate matter (aerosol), of coagula-tion efficiency, depending on the acoustic field sound pressure and frequency. It is described experimental stand that is used to do researches and methodology of experiments performance. It is used two sound generators for acoustic field excitation: piezoe-lectric and aero-acoustic. It was determined after researches, that increasing the frequency of the acoustic field, it is increased rate of particle coagulation when particle diameter not greater than 1 μm. Effectively coagulation of particles up to 1 μm in diameter must subsonic acoustic field frequencies, as the particles over 1 μm in diameter must be lower than the frequency of ultrasonic acoustic field. Atlikti labai mažo skersmens kietųjų dalelių koaguliacijos efektyvumo, priklausomai nuo akustinio lauko garso slėgio ir dažnio, tyrimai. Aprašytas tyrimams atlikti naudotas eksperimentinis stendas ir eksperimentų atlikimo metodika. Akustiniam laukui žadinti naudoti du garso generatoriai: pjezoelektrinis ir aeroakustinis. Atlikus tyrimus nustatyta, kad, didėjant akustinio poveikio dažniui, dalelių koaguliacijos greitis didėja, kai dalelių skersmuo neviršija 1 μm. Efektyviausiai dalelių iki 1 μm skersmens koaguliacijai reikia ultragarsinių dažnių, didesnio nei 1 μm skersmens dalelėms reikia žemesnio dažnio už ultragarsinį.

Laboratory and in situ sound absorption measurement under a synthetized diffuse acoustic field

2019 ◽  
Vol 26 (4) ◽  
pp. 223-242
Author(s):  
Olivier Robin ◽  
Alain Berry ◽  
Celse Kafui Amédin ◽  
Noureddine Atalla ◽  
Olivier Doutres ◽  
...  
Keyword(s):  
Acoustic Field ◽  
Sound Absorption ◽  
Low Frequency ◽  
Sound Field ◽  
Geometrical Parameters ◽  
In Situ Conditions ◽  
Field Excitation ◽  
Acoustic Environments ◽  
Field Sound

This article reports numerical and experimental results concerning the estimation of the diffuse field sound absorption coefficient of several different materials under a synthetized diffuse acoustic field excitation in laboratory and in situ conditions. The proposed measurement method is based on a sound field reproduction approach and a synthetic array of acoustic monopoles facing the material to be tested. Numerical simulations are first conducted to optimize the geometrical parameters of the method and to compute theoretical sound absorption coefficients of the considered materials. Measurements on a set of six typical acoustic materials are then conducted following the standardized reverberant room method as well as the proposed approach in a hemi-anechoic room and in two realistic rooms. Albeit showing limitations in the low-frequency domain, the proposed method enables a significant reduction of the tested specimen dimensions compared with the reverberant room method and allows performing tests in non-ideal acoustic environments.

Using reciprocity principles and sensitivity functions for the vibroacoustic response of panels under random excitations

2017 ◽  
Vol 141 (5) ◽  
pp. 3577-3577
Author(s):  
Christophe Marchetto ◽  
Maxit Laurent ◽  
Olivier Robin ◽  
Alain Berry
Keyword(s):  
Sensitivity Functions ◽  
Vibroacoustic Response
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