中文摘要：

研究了声纵波全向入射到两类一维流固声子晶体（第I类满足固体横波传播速度cst大于流体纵波传播速度cl以及第II类cst

英文摘要：

The transmission characteristics of acoustic longitudinal wave propagating in two types onedimensional（ 1D） liquid-solid periodic phononic crystals（ type I satisfies： the shear velocity cstof solid material bigger than the longitudinal velocity clof liquid,while type II satisfies cst cl） incited by omnidirectional incidence were investigated.A theoretical model of wave propagation in 1D solid-fluid periodic structure with omnidirectional incidence was established using the transfer matrix method,and the finite element method is used to test the correctness of our derivation,both methods show good consistence.For type I phononic crystal,total reflection phenomenon happens at high frequency,however,at low frequency total reflection tunneling effect appears.For type II,periodic band structures will take place in all frequency ranges.Acoustic band fracture appears in both types phononic crystal,however,the angle range of the fracture of type II is significant greater than type I＇s.