敷设声学覆盖层的板架结构抗冲击性能数值计算研究

为提高潜艇的隐身性能,通常在潜艇非耐压壳板外表面敷设消声瓦,在耐压壳体的外表面敷设隔声去耦瓦,在耐压壳体内表面敷设"阻尼层"(以上三种结构统称为多种声学覆盖层);由于声学覆盖层含有空腔的特殊结构形式,该空腔结构形式在受到爆炸冲击波时,腔体将产生变形并吸收能量,这将严重影响潜艇的抗冲击性能。因此,针对敷设声学覆盖层的板架结构的吸能性能进行研究,找出了覆盖层空腔结构变形、速度及加速度与冲击波能量吸收之间的关系,得到敷设声学覆盖层板架结构的抗冲性能;并对声学覆盖层结构进行优化,在此基础上,给出兼具抗冲和隔振功能的声学覆盖层结构设计及性能参数的优化建议。

NUMERICAL RESEARCH ON THE ANTI-SHOCK CAPABILITY OF PLATE-FRAME STRUCTURE COATED WITH ACOUSTIC COVERING LAYER

In order to improve submarine's hiding function,noise elimination tile is covered on exterior surface with the non-pressure shell;Deadening and decoupling tile is laid on exterior surface of the pressure shell;And damping layer is covered on inner surface with pressure shell(these three structures introduced above are all called multiple acoustic layer).Since the acoustic layer has special cavity structures in it,the cavity body will generate distortion and absorb energy when it encounters explosive shock waves.This will affect submarine's anti-shock performance seriously.This paper will investigate on the energy absorption capability of plate-frame structure coated with acoustic layer,find relationship between structure's distortion,velocity,acceleration and energy absorption capability,get structure's anti-shock capability,and optimize it.Based on this,the paper also provides some suggestions about design and performance parameters of structures coated with acoustic layer,which provide both shock resistance and vibration isolation.