By designing dual-ring resonance units,the metamaterial bipanels with square and triangular lattices are constructed.Their low-frequency bandgaps of flexural waves are calculated by using the finite element method.The results show that the frequency range of negative dynamic mass density caused from the local resonance is in a good agreement with that of the bandgap.Under the same lattice constant and material component conditions,the effects of rotation angle β of dual-ring and the acoustic wave incidence angle θ on the sound transmission loss are analyzed in the bandgap range of flexural wave for the metamaterial bipanels with the square and triangular lattices.Compared with the traditional homogeneous bipanels with the same mass,these new metamaterial bipanels have the advantages of low frequency,simple structure and small size,which have a wide application prospect in vibration and noise control.
关键词
声学/双层超材料板/弯曲波/低频带隙/点阵类型/隔声特性
Key words
acoustics/metamaterial bipanel/flexural wave/low frequency bandgap/different lattice/sound insulation
维普
万方数据