Abstract：The finite element method was used to calculate vibration responses of stiffened cylindrical shells with equal spacing arrangement and unequal spacing one. Taking vibration displacements in normal direction of these shells as inputs, the mean square normal velocity level acoustic transfer function of a shell model was obtained. In order to explain the effects of unequal spacing arrangement of structures on structural acoustic characteristics of cylindrical shells from the vibration mechanism, the wave number spectrum analysis method was used to transfrom vibration displacement responses of shells from spatial domain to wave number domain to decompose a shell vibration into a superposition of various harmonic waves with different amplitudes. The results showed that comparing with the structural acoustic characteristics of cylindrical shells stiffened with equal spacing arrangement of ribs, those of cylindrical shells with unequal spacing arrangement of ribs are greatly improved; ribs’ unequal spacing arrangement makes shell local vibration grow within the stopband frequency band, but it makes shell vibration drop significantly within the passband one.
谭 路，纪 刚，周其斗，张纬康. 结构不等间距布置对圆柱壳结构声学性能的影响[J]. 振动与冲击, 2017, 36(24): 189-194.
TAN Lu, JI Gang, ZHOU Qi-dou, ZHANG Wei-kang. Influence of unequal spacing arrangement of structures on structural acoustic characteristics of cylindrical shells. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(24): 189-194.
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