艇体结构分布式动力吸振器设计与分析

为控制艇体共振引起的低频线谱噪声,建立艇体结构流固耦合数值模型,根据结构低阶模态频率和振型特点设计了分布式动力吸振方案,并对其降噪效果进行计算。通过讨论吸振质量和工作频率的影响规律,分析安装在连续结构上的动力吸振器的减振机理。结果表明,动力吸振器可以有效减小艇体共振引起的水下噪声线谱峰值,吸振器主要通过改变结构的局部模态来发挥减振作用,可为连续结构的动力吸振器设计和低频线谱噪声控制提供参考依据。

Design and analysis of distributed dynamic vibration absorber on submarine hull

In order to control the low-frequency line-spectrum noise caused by submarine hull resonance,a fluid-solid coupling numerical model of the hull was established.According to the characteristics of low-order modal frequencies and modes of the hull,a distributed dynamic vibration absorber(DVA)scheme was designed,and the noise reduction effect was calculated.By discussing the influence of DVA mass and working frequency,the vibration absorption mechanism of DVA installed on the continuous structures was analyzed.The results show that DVA can effectively reduce the peak line-spectrum of underwater noise caused by the hull resonance,and DVA reduces vibration mainly by changing the local modes of structure.It can provide reference for the design of DVA and the control of low-frequency line-spectrum noise for continuous structures.