Sound source measurement by using a passive sound insulation and a statistical approach

Dragonetti, Raffaele; Filippo, Sabato Di; Mercogliano, Francesco; Romano, Rosario Aniello

doi:10.1016/j.jsv.2015.06.005

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…These sound-absorbing materials are classified into three main groups: passive, active, and semi-active noise control materials [ 5 , 6 ]. These materials could control mechanisms during the sound absorption phenomenon [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…This material involves a method that does not require an external supply of control energy by dissipating the propagation of the acoustic waves through various damping mechanisms [ 1 ]. Some of the examples of passive noise control materials are foams [ 1 ], felt [ 11 ], fibers [ 12 ], and glass wool [ 5 , 7 , 13 ], and they have been widely used in the context of building and transport applications [ 13 ]. However, the efficiency and sound absorption performance of passive noise control materials are poorer at lower-frequency ranges (20–200 Hz) [ 14 ], compared to that of active materials, for which extra energy consumption is inevitable [ 6 , 13 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and Tunable Sound Absorption Properties of an In-Situ Prepared Magnetorheological Foam

et al. 2020

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Conventional polyurethane foam has non-tunable sound absorption properties. Here, a magneto-induced foam, called magnetorheological (MR) foam, was fabricated with the feature of being able to tune sound absorption properties, primarily from the middle- to higher-frequency ranges. Three different samples of MR foams were fabricated in situ by varying the concentration of Carbonyl Iron Particles (CIPs) (0, 35, and 75 wt.%). The magnetization properties and tunable sound absorption characteristics were evaluated. From the magnetic saturation properties, the results showed very narrow and small coercivity of hysteresis loops relative to the soft magnetic properties of the CIPs. MR foam with 75 wt.% CIPs showed a higher magnetic saturation at 91.350 emu/g compared to MR foam with 35 wt.% CIPs at 63.896 emu/g. For tunable sound absorption testing, the effect of ‘shifting’ to higher frequency was also observed when the magnetic field was applied, which was ~10 Hz for MR foam with 35 wt.% CIPs and ~130 Hz for MR foam with 75 wt.% CIPs. As the latest evolution of semi-active noise control materials, the results from this study are valuable guidance for the advancement of MR-based devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic and Tunable Sound Absorption Properties of an In-Situ Prepared Magnetorheological Foam

et al. 2020

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“…In this way the sound field inside the box depends only on the vibrations of the box walls and therefore on the noise that can propagate through them. In previous works (Romano et al., 2013; Dragonetti et al., 2015) it was shown that, assuming a diffuse external sound field, a minimum number of five external microphones is enough to assess the external sound pressure field.…”

Section: Measurement Resultsmentioning

confidence: 99%

Statistical considerations on stationary-random noise propagating through a solid medium

Dragonetti

Lepore

Filippo

et al. 2016

Journal of Vibration and Control

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In this paper the noise propagation through a solid medium is considered\ud to study how the parameters of the statistical model change. In particular\ud the external and internal sound fields of a box are taken into account. It is\ud experimentally shown that the variance of the real and the imaginary parts\ud of the external stationary random noise change differently while going\ud through the box walls. The generalized Rayleigh distribution is shown to be\ud more suitable to model the noise inside the cavity instead of the classical\ud Rayleigh distribution. Starting from this outcome it has been studied how\ud this noise affects a signal.\ud It is known that a signal modulus affected by stationary random noise can\ud be described by using the Rice distribution if the real and imaginary parts\ud of the noise are statistically independent and identically distributed with\ud zero mean and equal variances. Otherwise the less popular generalized\ud Rice distribution must be used. The main differences of using the Rice or\ud the generalized Rice distributions are shown by considering phasors both\ud with constant and variable phases. In this paper it is shown that the bias\ud estimation depends on the phase of the phasor if the variances of the real\ud and imaginary parts are different and a numerical quantification is given.\ud The attained results are useful when performing measurements of the\ud sound pressure field due to a sound source inside a cavity affected by\ud external noise

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Pairwise comparison psychoacoustic test on the noise emitted by DC electrical motors

et al. 2017

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Sound source measurement by using a passive sound insulation and a statistical approach

Cited by 5 publications

References 18 publications

Magnetic and Tunable Sound Absorption Properties of an In-Situ Prepared Magnetorheological Foam

Magnetic and Tunable Sound Absorption Properties of an In-Situ Prepared Magnetorheological Foam

Statistical considerations on stationary-random noise propagating through a solid medium

Pairwise comparison psychoacoustic test on the noise emitted by DC electrical motors

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