分舱形式对圆柱壳结构声学性能影响研究

为研究舱壁布置形式对圆柱壳结构声学性能的影规律,文章应用有限元方法对等间距与不等间距分舱圆柱壳模型的振动响应进行了计算,以此为输入可计算获得壳体的均方法向速度级声学传递函数,并在典型频率处应用波数谱分析方法将壳体空间域振动场转换到波数域上,对壳体的振动进行波形分离与量化,分析获得了舱壁等间距布置与不等间距布置圆柱壳在典型激励下的结构声学性能,并解释其机理.研究表明:对垂向激励,圆柱壳不等间距分舱相比等间距分舱具有较好的结构声学性能,但对轴向激励,两者区别不明显.若将不等间距分舱与局部结构补强措施相结合,则可使得圆柱壳在两典型工况下均能获得更优的结构声学性能.

Study on the Influence of Bulkhead Arrangement Form on the Structural Acoustic Characteristics of Cylindrical Shell

The vibration response of cylindrical shells with periodic or aperiodic arrangement of bulk-head in typical force excitation was calculated by finite element method (FEM). Then, the mean square velocity level transfer functions were obtained by using the vibration response of different shells as the input. At the typical frequency, the wave number spectrum analysis method was applied to trans-form the vibration response of different shells from the spatial domain into the wavenumber domain. Therefore, the vibration of the shells can be separated into various simple harmonic waves, whose amplitude determines their respective contribution to the vibration. Finally, by comparing the mean square velocity level transfer functions and wavenumber spectrums of the different shells, the influ-ence of different bulkhead arrangement forms on the structural acoustic characteristics of cylindrical shell was obtained. The results show that: for the vertical force excitation, the cylindrical shell with aperiodic arrangement of bulkhead has better structural acoustic characteristics, which however is not obvious for axial force excitation. In the case of the combination of the aperiodic arrangement of bulk-head and the measures of strengthening local structure, the cylindrical shell can obtain better struc-tural acoustic characteristics in both vertical and axial force excitation.