理想饱和孔隙地层非线性参数对内部声场的影响  

Influence of Nonlinear Parameters on Internal Acoustic Field in Ideal Saturated Pore Formation

作　　者：姜岳 JIANG Yue(The 715 Research Institute of CSIC,Hangzhou 310023,China)

机构地区：[1]中国船舶重工集团公司第七一五研究所,浙江杭州310023

出　　处：《电声技术》2022年第2期17-24,共8页Audio Engineering

摘　　要：基于充分顾及固相骨架与液相流体形变耦合的完备的饱和孔隙介质弹性能公式,研究理想饱和孔隙地层非线性参数对内部声场的影响。通过对比分析,依次观察4个非线性参数所在非线性项的有无对一维有限振幅纵、横波源激发的非线性声场结构产生的影响。发现γ2所在的固相骨架体积应变与液相流体应变耦合的非线性项的消失,对于声场中任一参考点,将削弱一维有限振幅纵波源在该点激发的非线性声场强度16 dB,其他非线性参数的消失则对其变化贡献很小;γ4所在的固相骨架剪应变与液相应变耦合的非线性项的消失,将掩盖一维有限振幅横波源激发的非线性声场的高频近距离处及低频远距离处的复杂声场结构,会忽视一些重要的非线性声场特征。In this paper, based on a complete strain energy formula for saturated porous media which fully considers the coupling of solid phase skeleton and liquid phase fluid deformation, the effects of nonlinear parameters of ideal saturated pore formation on internal acoustic field are studied. Through comparative analysis, the influence of the nonlinear terms of the 4 nonlinear parameters on the structure of the nonlinear acoustic field excited by one-dimensional finite amplitude longitudinal and shear wave source is observed successively. It is found that for any reference point in the acoustic field, the disappearance of the nonlinear term in γ2 coupled with the volume strain of the solid phase skeleton and the liquid phase fluid strain will weaken the intensity of nonlinear acoustic field excited by the p-wave source by about 16 dB, and the disappearance of other nonlinear parameters makes little contribution to its change;The disappearance of the nonlinear term in γ4 coupling between the solid phase skeleton shear strain and the liquid phase strain will conceal the complex structure of nonlinear acoustic field excited by the s-wave source for high frequency at short distance and for low frequency at long distance, and some important characteristics of the nonlinear acoustic field will be neglected.

关 键 词：非线性参数 饱和孔隙地层 非线性声场 弹性能 

分 类 号：TN912[电子电信—通信与信息系统]