Sound absorption performance analysis of anechoic coating under hydrostatic pressure considering cavity pressure

Table 1. Geometric dimensions of anechoic coating unit cell
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Table 1. Geometric dimensions of anechoic coating unit cell
尺寸数值
覆盖层长度l_a/mm 50
空腔长度l_b/mm 40
空腔外径r_a/mm 8.4
空腔内径r_b/mm 2.1

Table 2. Rubber material parameters of anechoic coating
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Table 2. Rubber material parameters of anechoic coating
参数数值
静态动态
杨氏模量/Pa 8.9e6 8.9e6+2.3e3*f−0.01*f²
泊松比 0.496 0.496
损耗因子 − 0.2+1.2e−4*f−8.2e−9*f²
密度/(kg·m⁻³) 900 900

Table 3. The cavity modal frequency and the 1st and 2nd valley frequencies of sound absorption under different hydrostatic pressures

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Table 3. The cavity modal frequency and the 1st and 2nd valley frequencies of sound absorption under different hydrostatic pressures

参数	静压/MPa
参数	0	0.5	1.5	2.5
空腔长度l_b/mm	40.0	39.4	38.3	37.2
f₁₀模态频率/Hz	4 287.50	4 348.53	4 474.81	4 606.64
第1谷值频率/Hz	4 281	4 320	4 398	4 478
f₂₀模态频率/Hz	8 575.00	8 697.06	8 949.63	9 213.28
第2谷值频率/Hz	8 561	8 654	8 820	8 992

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Wenkai DONG, Meixia CHEN. Sound absorption performance analysis of anechoic coating under hydrostatic pressure considering cavity pressure[J]. Chinese Journal of Ship Research, 2022, 17(1): 132

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