声激励简单导管的声辐射特性研究

发布时间：2018-03-19 01:15

本文选题：导管声学　切入点：声源激励　出处：《船舶力学》2017年02期 　论文类型：期刊论文

【摘要】：采用NASTRAN无限元技术,对简单导管受声激励的声辐射特性进行了研究,建立了导管声波模态和辐射声能量之间的直接联系,并考虑了导管半径、长度、长径比三种因素对管内声波模态、管外辐射声功率和远场声指向性的影响。研究结果表明:影响导管声波模态和辐射声功率的参数主要有两个,一是无因次波数,二是导管长径比;导管的长径比越小,总辐射声能量变小,但侧方屏蔽效应也变差,因此需综合考虑长径比变化对总辐射声能量和声指向性的影响;和导管的侧方屏蔽效应主要作用于中高频,低频时导管外的声场与入射声场基本相同。
[Abstract]:The acoustic radiation characteristics of a simple duct excited by sound are studied by using NASTRAN infinite element technique. The direct relationship between the acoustic mode and the radiated sound energy of the duct is established, and the radius and length of the duct are considered. The influence of three factors on the acoustic mode, the radiated sound power and the far-field acoustic directivity of the tube is studied. The results show that there are two main parameters affecting the acoustic mode and the radiated sound power, one is the dimensionless wave number, the other is the dimensionless wave number. Second, the ratio of length to diameter, the smaller the ratio of length to diameter, the smaller the total radiated sound energy, but the worse the side shielding effect, so it is necessary to consider the influence of the ratio of length to diameter on the total radiation sound energy and sound directivity. And the side shielding effect of the duct is mainly applied in the middle and high frequency, and the sound field outside the duct is basically the same as the incident sound field at low frequency.
【作者单位】：海军装备研究院;海军工程大学舰船工程系;
【基金】：总装备部“十二五”预研项目(9140A14080512JB11165)
【分类号】：O422.6

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