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Implementation of acoustic materials to the VLS-1 Fairing - a sensitivity analysis using SEA

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      Satellite launchers are submitted to severe acoustic loads mainly during lift-off where SPL achieve, at the upper parts, values within the range of 140-160 dB. Such an excitation can damage embedded elements, if energy attenuation measures are not adopted. In view of managing the PLF vibro-acoustic environment, numerical techniques are applied to predict elasto-acoustic behavior. This manuscript presents a numerical study on the design of acoustic insulation for the VLS-1 fairing compartment. An excitation profile based on the literature is applied on a SEA coupled model of this structural-acoustic system and absorbing materials are added to the model. Two parameters of the absorbing material layer are analyzed: thickness and covered area. Two NCT modeling approaches are used to simulate the effect of blanketing the VLS-1 fairing: acoustic materials Biot's parameters, given by the manufacturer, and material samples absorption coefficient, measured in a Kundt Tube. Results show that an increase in the blanket thickness from 7.62 to 12.7 cm results in a TL of 1.7 dB OSPL, while variations of up to 3.0 dB OSPL are calculated if the fairing cavity blanketed area varies from 30% to 100%.

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      Most cited references 10

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      Propagation of Sound in Porous Media: Modeling Sound Absorbing Materials

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        Implementation of Acoustic Blankets in Energy Analysis Methods with Application to the Atlas Payload Fairing

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          ISO 10534-2: 1998, "Determination of sound absorption coefficient and impedance in impedance tubes -Part 2: Transfer-function method"


            Author and article information

            [1 ] Institute of Aeronautics and Space Brazil
            [2 ] Institute of Aeronautics and Space Brazil
            Role: ND
            Role: ND
            Journal of the Brazilian Society of Mechanical Sciences and Engineering
            J. Braz. Soc. Mech. Sci. & Eng.
            Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM (Rio de Janeiro )
            March 2012
            : 34
            : 1
            : 82-88
            S1678-58782012000100011 10.1590/S1678-58782012000100011


            Product Information: SciELO Brazil


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