Assessment of the airborne sound insulation from mobility vibration measurements; a hybrid experimental numerical approach

Roozen, N.B.; Leclère, Quentin; Urbán, Dániel; Echenagucia, Tomás Méndez; Block, Philippe; Rychtáriková, Monika; Glorieux, Christ

doi:10.1016/j.jsv.2018.06.058

Cited by 14 publications

(10 citation statements)

References 32 publications

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“…The structural response measurement was done by means of vibrometry (laser Doppler vibrometer, LDV). The second one is a hybrid experimental numerical approach to determine airborne sound insulation by using mobility measurement combined with a numerical procedure [45]. In this approach the device under test is mechanically excited by means of a shaker, and the response is measured by LDV.…”

Section: Overview Of Measuring Methodsmentioning

confidence: 99%

On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements

et al. 2021

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The article focuses on the determination of the acoustic properties (sound transmission loss, sound absorption and transmission coefficient under acoustic plane wave excitation) of membrane-type of specimens by means of a combination of incident plane wave sound pressure and membrane surface displacement information, measuring the sound pressure with a microphone and the membrane displacement by means of a laser Doppler vibrometer. An overview of known measurement methods and the theoretical background of the proposed so-called mobility-based method (MM) is presented. The proposed method was compared with the conventional methods for sound transmission loss and absorption measurement in the impedance tube, both numerically and experimentally. Finite element model (FEM) simulation results of two single layer membrane samples of different shape configurations were compared, amongst which six different variations of the backing wall termination. Four different approaches to determine the sound transmission loss and two methods to determine sound absorption properties of the membranes were compared. Subsequently, the proposed method was tested in a laboratory environment. The proposed MM method can be possibly used to measure the vibro-acoustic properties of building parts in situ.

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Section: Overview Of Measuring Methodsmentioning

confidence: 99%

On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements

et al. 2021

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“…In these cases, it is not necessary to excite the whole surface of the structure, since only certain columns of Y(x) are needed. Moreover, symmetry properties can also be exploited to reduce the measurement effort in many applications [19]. Finally, we note that the proposed hybrid procedure is predominantly a low frequency method, and hence, coarse response and excitation grids are generally sufficient.…”

Section: Combined Experimental-numerical Evaluation Of Vibroacoustic ...mentioning

confidence: 98%

“…A similar approach has been studied in the context of active control by using simulated measurement data and the boundary element method [18]. More recently, Roozen et al [19] characterized sound transmission by means of mobility measurements and the Rayleigh integral methodan approach that may be categorized as vibration-based sound power measurement [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…For our purpose of evaluating damping by far-field sound radiation, BEM is particularly appealing because it does not require special treatments for modeling unbounded acoustic domains. Moreover, in comparison to analytical evaluation of sound radiation [19], the use of BEM allows to consider complex geometries as well as acoustic short circuiting induced by slits and gaps. The latter plays a significant role in the sound insulation and radiation at low frequencies [23,24], which will be demonstrated later in this paper.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid assessment of acoustic radiation damping combining in-situ mobility measurements and the boundary element method

2022

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A hybrid experimental-numerical approach is proposed for assessing acoustic radiation damping – a major energy dissipating mechanism in lightweight structures. The vibrational behavior is characterized by distributed mobility measurements using laser Doppler vibrometry allowing to realistically capture the mechanical behavior of the structure under test. The experimentally obtained matrix of mobilities are coupled to a boundary element model to evaluate the radiated sound power numerically. Thereby, acoustic measurements and associated low frequency limitations are avoided, which results in two salient features of the proposed hybrid approach: modeling of diffuse incident acoustic fields and consideration of acoustic short-circuiting induced by slits and gaps. These features contribute to an accurate and excitation-dependent estimation of acoustic radiation damping in the low frequency range. The proposed hybrid approach is applied to flat and C-shaped aluminum sandwich panels mounted onto a tub-shaped foundation. The results are compared to those obtained by a previously reported numerical method.

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“…There are plenty of publications about that, even publications describing how to determine sound transmission loss by neglecting the impact of sound transmission chambers. Some recent examples are [52][53][54][55].…”

Section: Cutoff Frequencymentioning

confidence: 99%

Characterization of New Sustainable Acoustic Solutions in a Reduced Sized Transmission Chamber

et al. 2019

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In order to assess the airborne sound insulation of a new material or building solution, access to standardized laboratories, large and expensive facilities, and a sample area of at least 10 m2 are required. At the research and development stages of new sustainable acoustic materials for construction, it is not easy to make large sample areas available. Moreover, the financial investment in acoustic testing of materials during the research stage in standardized laboratories is excessive. In this work, the assessment of the airborne sound insulation of multi-layer partitions designed with new sustainable materials is presented. The assessed solutions are formed by green composite fiber boards as lightweight elements and a new material designed from sheep wool as absorbent material. The results of these 100% recyclable solutions are compared with lightweight element based solutions, which are commonly used for acoustic insulation. Characterization of those new sustainable solutions for building is leveraged in a reduced sized transmission chamber. The design, construction, and validation of this kind of laboratory are provided. This laboratory enables the assessment of the airborne sound insulation of a material in its research stage.

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Assessment of the airborne sound insulation from mobility vibration measurements; a hybrid experimental numerical approach

Cited by 14 publications

References 32 publications

On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements

On the Determination of Acoustic Properties of Membrane Type Structural Skin Elements by Means of Surface Displacements

Hybrid assessment of acoustic radiation damping combining in-situ mobility measurements and the boundary element method

Characterization of New Sustainable Acoustic Solutions in a Reduced Sized Transmission Chamber

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