分布式声学黑洞浮筏系统隔振性能研究

Vibration isolation performance of distributed acoustic black hole floating raft system

为进一步提高浮筏系统隔振性能,提出分布式声学黑洞浮筏隔振系统。首先根据声学黑洞结构特点,提出将单个声学黑洞分解为4个小尺寸声学黑洞的分布式声学黑洞方案;其次,采用有限元法,开展分布式声学黑洞方案对平板结构以及典型筏架结构振动响应的影响研究,并与单个声学黑洞方案进行对比分析,建立分布式声学黑洞浮筏系统有限元模型;最后,探究分布式声学黑洞浮筏系统的隔振性能以及对船舶舱段机械噪声的影响。研究表明,相比单个声学黑洞,分布式声学黑洞浮筏具有更好的低频隔振性能,能够有效降低舱段的机械噪声水平。

Here,to further improve vibration isolation performance of floating raft system,a distributed acoustic black hole floating raft vibration isolation system was proposed.Firstly,according to structural characteristics of acoustic black hole,a distributed acoustic black hole scheme was proposed to decompose a single acoustic black hole into 4 small-size acoustic black holes.Secondly,effects of the distributed acoustic black hole scheme on vibration responses of flat plate structure and typical raft structure were studied by using the finite element method,the results and those obtained using the single acoustic black hole scheme were analyzed contrastively to establish the finite element model for the distributed acoustic black hole floating raft system.Finally,vibration isolation performance of the distributed acoustic black hole floating raft system and its effects on mechanical noise of ship cabin were explored.The study results showed that compared with a single acoustic black hole,the distributed acoustic black hole floating raft system has better low-frequency vibration isolation performance and can effectively reduce mechanical noise level of ship cabin.