摘要
以水中有限长纵向加肋圆柱壳体为研究对象,推导了水中有限长纵向加肋圆柱壳体的声固耦合振动方程,其中纵向肋骨的作用表现为在基本圆柱壳体声固耦合振动方程中增加相应的附加阻抗,因此壳体的振动和声辐射由壳体机械阻抗、辐射阻抗和纵向肋骨附加阻抗决定。通过数值仿真算例对外力激励下有限长纵向加肋圆柱壳体振动与声辐射影响因素进行了研究。结果表明纵向加肋对水中圆柱壳体的辐射声功率影响不大,但壳体表面平均振动速度明显降低,而材料损耗因子对几乎所有频段内水中圆柱壳体的辐射声功率和表面平均振动速度都有明显抑制作用。
The coupled vibration equation of axially stiffened finite cylindrical shell was derived,in which the additional impedance caused by the axial stiffeners is considered.As a result,the vibration and sound radiation of the shell depend on the mechanical impedance of shell,the radiation sound impedance and the additional impedance.Based on the numerical simulation,the influencing factors for sound radiation characteristics of submerged simply-supported finite length cylindrical thin shells excited by external force were investigated.It is found that the number of axial stiffeners just has a slight influence on radiated sound power,whereas structural damping is of great influence on radiated power and radial quadratic velocity on the surface of shell.The study can give some guidelines for noise reduction of this kind of shells.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第5期74-79,83,共7页
Journal of Vibration and Shock
关键词
有限长纵向加肋圆柱壳
振动与声辐射
辐射声功率
均方振速
axially stiffened finite cylindrical shells
vibration and acoustic radiation
radiated sound power
radial quadratic velocity
