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水下三弹性柱壳耦合声散射特性研究 被引量:2
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作者 白振国 胡东森 +1 位作者 俞孟萨 刘璐璐 《声学学报》 EI CSCD 北大核心 2019年第6期994-1004,共11页
为研究3个并排无限长弹性圆柱壳受垂直于柱轴方向的平面声波作用的声散射特性,采用Fourier级数展开法建立了圆柱壳声散射数学物理模型,考虑了三圆柱壳弹性振动声辐射和刚性声散射,建立了3个壳体辐射声场和刚性散射声场的耦合作用关系,... 为研究3个并排无限长弹性圆柱壳受垂直于柱轴方向的平面声波作用的声散射特性,采用Fourier级数展开法建立了圆柱壳声散射数学物理模型,考虑了三圆柱壳弹性振动声辐射和刚性声散射,建立了3个壳体辐射声场和刚性散射声场的耦合作用关系,比对了等效散射强度的刚性散射分量与弹性散射分量,并分析了三壳体等效散射强度特性。计算结果表明:当ka2>40,在频率f=3000 Hz以上频段,弹性分量对等效散射强度变化趋势的贡献可以忽略。当ka2>30,在频率f=2400 Hz以上频段,弹性散射分量对等效散射强度影响不超过3 dB;三壳与单壳的等效散射强度在0°入射角方位相当,其它方位三壳体等效散射强度明显大于单壳体。本文的理论公式可推广到任意数量阻抗柱的声透射和声反射问题。 展开更多
关键词 散射强度 声散射 弹性散射 数学物理模型 平面声波 声透射 声反射 辐射声场
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声呐腔流激噪声场空间互功率谱及相干性研究
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作者 吴登峰 俞孟萨 +2 位作者 白振国 李东升 余晓丽 《中国造船》 EI CSCD 北大核心 2023年第3期102-113,共12页
随着声呐基阵孔径的增大及探测频率的不断降低,声呐自噪声场特性研究需要由自功率谱空间分布特性扩展到空间互功率谱及相干特性。针对矩形腔和弹性矩形板透声窗组合的声呐腔结构,考虑弹性平板与内外声场的耦合作用,采用模态法建立了矩... 随着声呐基阵孔径的增大及探测频率的不断降低,声呐自噪声场特性研究需要由自功率谱空间分布特性扩展到空间互功率谱及相干特性。针对矩形腔和弹性矩形板透声窗组合的声呐腔结构,考虑弹性平板与内外声场的耦合作用,采用模态法建立了矩形板受湍流边界层脉动压力激励的腔内水动力噪声场空间互功率谱及空间相干性计算模型,计算分析了在不同频率和不同噪声场空间场点位置情况下的声呐腔水动力噪声场空间互功率谱和相干性特征,计算结果与实船声呐舱水动力噪声测试结果一致。 展开更多
关键词 声呐腔 流激噪声场 互功率谱 空间相干性
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Underwater sound scattering characteristics of three paralleling flexible cylindrical shells 被引量:1
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作者 BAI Zhenguo HU Dongsen +1 位作者 yu mengsa LIU Lulu 《Chinese Journal of Acoustics》 CSCD 2020年第1期64-82,共19页
To investigate the sound scattering characteristics of three paralleling flexible cylindrical shells with the plane incident wave,a mathematical model is established with Fourier series expansion method which involves... To investigate the sound scattering characteristics of three paralleling flexible cylindrical shells with the plane incident wave,a mathematical model is established with Fourier series expansion method which involves the flexible vibration,the sound radiation and the rigid scattering of each shell and their coupling through the sound field.With the model,the difference between the flexible radiation term and the rigid scattering term of the sound field of three combined cylindrical shells is calculated and analyzed,as well as the scattering strength of the shells.The results demonstrate that the flexible radiation term can be ignored for ka2>40(f>3000 Hz),and for the instance of ka2>30(f>2400 Hz),the scattering strength error without the flexible radiation term is less than 3 dB.The scattering strength of three shells is approximately equal to the scattering strength of single shell while the incident angle is 0°or vicinity angle,whereas the scattering strength of multi-shells is higher than that of single shell for the distinct incident angle.The mathematical model in this paper could be easily extended to solve the problems of transmission and reflection of random number of resistant cylindrical shells. 展开更多
关键词 FIELD SHELLS CYLINDRICAL
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Transfer matrix method for internal noise prediction of an arbitrary shell-cavity structure induced by temporal-spatial random surface excitation
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作者 LIU Jin LIU Xiaona +2 位作者 ZHOU Ying SHEN Qi yu mengsa 《Chinese Journal of Acoustics》 CSCD 2021年第1期111-125,共15页
Combining structural finite element method(FEM),acoustic finite element and boundary element methods,a model of elastic shell vibration of an arbitrary shell-cavity structure coupled with internal and external sound f... Combining structural finite element method(FEM),acoustic finite element and boundary element methods,a model of elastic shell vibration of an arbitrary shell-cavity structure coupled with internal and external sound fields is built.In addition,the transfer matrices from the excitation force to vibration of the shell and internal sound field are calculated.As the fluctuating pressure of turbulent boundary layer(TBL) is a temporal-spatial random surface excitation,the overall shape function matrix is introduced,and then the relationship between power spectral density matrix of the generalized nodal force of the elastic shell and power spectral density of the temporal-spatial random surface excitation is derived.Utilizing the vibro-acoustic coupled transfer matrix,relationships between the power spectral densities of vibration of the elastic shell/internal sound field and the power spectral density matrix of the generalized nodal force are obtained.Thus,the calculation method of vibration and internal sound field of an arbitrary shell-cavity structure induced by temporal-spatial random surface excitation is established.A typical vibro-acoustic coupled model of a rectangular cavity with acoustic media internally and externally,and with elastic rectangular plate on one side,is taken as example.The vibration of the elastic shell and power spectral density of the internal sound field are calculated and compared with the analytical method.The two results generally agree with the analytical one,with deviations of about 1 dB and 2 dB,respectively.The transfer matrix method has good adaptability which is not restricted by the shell-cavity structure and the shape of the inner region. 展开更多
关键词 EXCITATION MATRIX ARBITRARY
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Prediction and test of cavity's hydrodynamic self-noise induced by turbulent boundary layer
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作者 LIU Xiaobin Lü Shijin yu mengsa 《Chinese Journal of Acoustics》 CSCD 2016年第2期147-154,共8页
The self-noise in cavity is tested in the circling tank, prediction method of cavity's self-noise induced by turbulent boundary layer is established. The window's vibration is using the simply supported boundary con... The self-noise in cavity is tested in the circling tank, prediction method of cavity's self-noise induced by turbulent boundary layer is established. The window's vibration is using the simply supported boundary condition, the sound wave in the cavity is expanded using the rigid wall boundary condition, the modal coupling vibration equation between them is established using the radiation boundary condition. The turbulent boundary layer pulsating pressure is random, the self-noise power spectrum in the cavity is solved. Test of self-noise and turbulent pressure is carried out in the circling tank when the flow velocity is 5 m/s and 8 m/s, the result verifies that the theoretical method can predict the real cavity's hydrodynamic noise approximately, the trends are similar, this provides one analytical method for sonar dome's material selection and noise control. 展开更多
关键词 Prediction and test of cavity’s hydrodynamic self-noise induced by turbulent boundary layer
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