湍流激励下单双层圆柱壳振动特性对比

基于随机理论,采用半解析半数值方法,以单双层圆柱壳模型为例,计算了湍流激励下单双层圆柱壳的输入功率谱密度和振动速度功率谱密度,对比分析了单双层圆柱壳的振动特性.结果表明：随着航速增高,湍流脉动压力激起壳体表面振动速度的自功率谱密度幅值变大,趋势基本相同;同一航速下,湍流脉动压力作为面分布力作用在壳体外表面上,由于双壳体的外壳较薄,因此双壳体振动速度响应大于单壳体的.

Comparing the vibration characteristics of single cylindrical shells and double ones excited by turbulent boundary layers

According to the random theory,the power spectra density of the turbulent fluctuation pressure and the velocity response′s power spectra density of single and double cylinders excited by turbulent boundary layer were calculated through semi-analytical and semi-numerical method.Furthermore,the velocity response of single and double cylindrical shells was compared.It′s shown that the power spectral density of the cylindrical shell′s velocity becomes higher as the velocity becomes higher.When the velocity is equal,the vibration of double cylinder shell is higher than that of single cylinder shell,because the turbulent boundary layer acts on the cylindrical shell as surface distribution forces and the out-layer shell of double cylinders is thinner than that of single cylinders.