【摘要】 采用波传播分析方法,讨论了外部敷设粘弹性自由阻尼材料的无限长圆柱壳在流场中受径向简谐激励的振动功率流。用复模量形式计及粘弹性阻尼的损耗因子,研究了自由阻尼圆柱壳在外激励作用下的输入功率流和沿壳体传播的功率流。结果表明粘弹性阻尼层可以明显降低激振力输入壳体的功率流,加快振动波在结构内的衰减,为潜艇结构和水下各种管道的减振降噪提供了一定的理论参考。更多还原

【Abstract】 Employed wave propagation approach,the vibrational power flow of a submerged infinite cylindrical shell coated with unconstrained viscoelastic layer excited by a radical harmonic force is studied.The damping factor of the damping material is considered by complex Young’s modulus.Vibrational power flow input and transmission along the shell axial direction in a damped cylindrical shell are discussed,respectively.The numerical results indicate the unconstrained viscoelastic layer can obviously reduce the power flow input and rapidly attenuate the power flow transmission,which may be valuable to the application of damping material on noise and vibration control of submarines and underwater pipes.更多还原