摘要
基于模态叠加法,采用Navier方程描述阻尼层,建立敷设粘弹性阻尼层的水下圆柱壳振动声辐射模型。与数值计算结果比对,验证了计算模型的可靠性。分析圆柱壳的径向均方振速和辐射声功率,研究了粘弹性阻尼层对水下圆柱壳辐射声场的去耦特性影响。结果表明,粘弹性阻尼层的径向均方振速频响曲线可以分作三个频段,当频率较高时,粘弹性阻尼层能降低辐射声功率;与壳体厚度相比,阻尼层厚度对阻尼层去耦特性的影响更大。
Based on modal superposition method, a model of vibration and sound radiation of underwater cylindricalshell with viscoelastic damping layer is established. In this model, the behavior of the damping layer is described withNavier equation. Numerical results of this model are obtained. The decoupling characteristic of the viscoelastic dampinglayer to the sound radiation field of the underwater cylindrical shell is investigated by analyzing the mean square velocity ofradial vibration and the sound radiation power of the cylindrical shell. The results show that the frequency response curve ofthe mean square velocity of the radial vibration of the viscoelastic damping layer can be divided into three intervalsaccording to the frequencies. Only in the interval of significantly high frequencies, the sound radiation power can be reducedby the viscoelastic damping layer. Thickness of the damping layer has larger influence on the decoupling effect than thethickness of the shell does.
出处
《噪声与振动控制》
CSCD
2014年第2期22-27,共6页
Noise and Vibration Control
基金
中央高校基本科研业务费专项资金资助(基金编号:HEUCF130506)
关键词
振动与波
粘弹性阻尼层
模态叠加法
水下圆柱壳
去耦特性
vibration and wave
viscoelastic damping layer
modal superposition method
underwater cylindricalshell
decoupling characteristic
