Implementation of Acoustic Materials to the VLS-1 Fairing - A Sensitivity Analysis Using SEA

被引:0
|
作者
Pirk, Rogerio [1 ]
Souto, Carlos d'Andrade [1 ]
机构
[1] Inst Aeronaut & Space, Div Integrat & Tests, BR-12228904 Sao Jose Dos Campos, SP, Brazil
关键词
statistical energy analysis; acoustic materials; sound attenuation; launchers; fairing;
D O I
暂无
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
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%.
引用
收藏
页码:82 / 88
页数:7
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