加肋圆柱壳近场消散波的衰减特性  

Research of decay characteristic of near field evanescent waves of a ring stiffened cylindrical shell

作　　者：黄振卫[1] 周其斗[1] 纪刚[1] 谭路[1] 

机构地区：[1]海军工程大学舰船工程系,武汉430033

出　　处：《海军工程大学学报》2016年第2期102-107,共6页Journal of Naval University of Engineering

摘　　要：以加肋圆柱壳为研究对象,首先采用波数谱方法分离出结构主振型分量（携带能量最多的振动模式）的振动波长;然后,采用消散波理论重点分析了结构主振型的近场消散波衰减变化规律。计算结果表明：当结构弯曲波波长小于声波波长时,近场消散波的轴向波长与结构弯曲波波长相等;对于该算例,距离结构外表面0.2~0.5倍声波波长时,主振型分量的消散波可以被认为衰减为零。所得结论对于认识加肋圆柱壳结构近场消散波的衰减变化规律以及声有限元法（FEM）人工边界的选取具有一定的参考意义。The wave-number spectrum method is used to obtain the structural wavelength of main vibration mode,and then the evanescent wave theory is adopted to approximately analyze the decay characteristic of evanescent wave of the main vibration mode.The computational results show that when the wavelength of bending wave on the structural wetted surface is shorter than the acoustic wavelength,the axial wavelength of the evanescent wave is equal to the corresponding wavelength of bending wave.For the computational example mentioned,the evanescent wave of the main vibration mode approximately decays to zero at a distance of 0.2to 0.5times the acoustic wavelength away from the structural wetted surface.The conclusion is of significance to the analysis of the evanescent wave in the near field and to the determination of artificial boundary of FEM.

关 键 词：加肋圆柱壳 消散波 振动与声辐射 流固耦合 

分 类 号：O427.2[理学—声学]