【摘要】 基于金属三明治板的周期特性,建立了其夹芯层等效弹簧和扭簧组合模型。利用所建立的模型和空间谐波展开法,首先研究了中间为空气腔的双层板的隔声性能,理论结果与实验结果取得较好的一致,验证了模型的合理性;并进一步研究了中间层为瓦楞加筋三明治板的隔声性能。结果表明,声波入射角以及瓦楞加筋板与平板的夹角对其隔声性能影响显著,适当改变瓦楞加筋板与平板的夹角可以有效避开结构的隔声低谷;三明治板对垂直入射声波的隔声效果最好。更多还原

【Abstract】 Sound transmission through metallic sandwich panels with corrugated core is investigated using the space- harmonic method.A unit cell model is developed to provide the effective translational stiffness and rotational stiffness of the core,based on the periodicity of the microstructure of the panels.The developed model is first applied to analyze sound insulation of double-panel structure with air cavity.Obtained predictions are found to agree well with available experimental results.The model is then employed to investigate the effects of sound incidence angle and the inclination angle between face sheet and core sheet on Sound Transmission Loss (STL).Obtained results show that the inclination angle has a significant effect on STL and it is facility to avoid STL dips by altering the inclination angle.Moreover, it is found that sandwich panels with corrugated core are more suitable for the insulation of sound waves with small incidence angle.更多还原