周期性舰船夹芯板弯曲波带隙与减振降噪研究

Flexural wave bandgap and isolation characteristics of vibration and sound in periodic sandwich plates

[目的]旨在研究轻质夹芯板弹性波的传播规律与减振降噪机理。[方法]采用有限元方法结合布洛赫定理,对周期性夹芯板色散关系与弯曲波带隙特性进行研究,分析振动传输特性和声传输特性,研究轻质夹芯板减振降噪特性,并对轻质夹芯板振动传递衰减特性进行实验验证。[结果]研究结果表明,由于布拉格(Bragg)散射调制作用,轻质夹芯板在特定频段存在弯曲波带隙,弯曲振动带隙频率范围内具有良好的减振降噪效果。[结论]轻质夹芯板结构参数对弯曲波带隙具有显著的调节作用,为舰船结构振动噪声控制与声隐身设计提供了新的技术途径。

[Objective]This paper aims to study the elastic wave propagation characteristics and vibration and noise reduction mechanisms of periodic ship sandwich plates.[Method]To this end,the dispersion relation and flexural wave bandgap characteristics of lightweight sandwich plates are numerically investigated using the finite element method in combination with the Bloch theorem.The flexural vibration and sound transmission properties are analyzed to study vibration and sound reduction,and experimental validation is further conducted to verify the numerical results.[Results]Lightweight sandwich plates can yield flexural wave bandgaps in a specific frequency range due to the Bragg scattering effect,resulting in flexural vibration isolation and sound insulation.[Conclusion]Flexural wave bandgaps can be effectively tuned by geometrical parameters,and this technology can potentially be applied in the vibration and sound control of ship structures.