Wave Propagation In A Fluid-filled Poroelastic Hollow Cylinder With Seismoeletric Effect

Cylindrical shell structure in the actual production in various fields hasimportant applications. It has practical significance in the applications of cylindricalshell structure to study propagation characteristics of the acoustic wave and acousticpower coupled wave of cylindrical shell of infinite fluid saturated porous shell. Thethesis studied the propagation characteristics of the acoustic wave and acousticpower coupled wave of cylindrical shell of infinite fluid saturated porous shell byBiot theory and Pride theory.On basis of Biot equation and Pride equation, the thesis resolving potentialfunction using Helmholtz method. Then deriving the theory expression of theacoustic wave and acoustic power coupled wave of cylindrical shell of infinite fluidsaturated porous shell. The expression of acoustic field and electromagnetic field ofporous shell by potential function are obtained. At the same time we solve theproblem by quasi-static method. And simulating the acoustic field, electromagneticfield and acoustic power coupled wave field in numerical, then compare and testresults of those two method.By using system response got from the method of frequency wave number, wecompare the full wave composition got from numerical simulation to know thecharacteristics of full wave clearly. We also investigated the acoustic field andelectromagnetic field in different thickness of shell (the thickness of shell is thedifference of inner and outer radius). And simulated the full wave form in transitionacoustic field, electric field and magnetic field in shell in numerical. We investigatethe impact of shell thickness, mineralization and permeability to transition electromagnetic field. For the usual model parameter, there is no difference in resultgot from the two methods. So the exactness of quasi-static method is tested. So wecan solve the problem of fluid saturated porous shell by quasi-static method toimprove the computing efficiency. At the same time, we investigate thecharacteristics of response of wave field in frequency-wavenumber domain. Thestudy of the thesis offer basis reference for analyzing propagation characteristic ofearthquake electricity coupled wave of fluid saturated porous shell in theory andexperimental.Employing typical underground sandstone physical property parameter, Weinvestigated the acoustic and electromagnetic field in the porous cylinders ofdifferent wall thickness(thickness is equal to the range from inner radius to outerradius).And derived the full wave form of switch acoustic and electromagnetic fieldin the porous cylinders. The acoustic and electromagnetic field have three modes infast formation and have two modes in slow formation. When the thickness is fixed,the amplitude of longitudinal wave will increase with the radius increases in fast andslow formation, while the amplitude of electromagnetic field Stoneley wave willdecrease. The amplitude of electronic field in inner fluid will decrease with themolarity of fluid increases and will decrease with the molarity of electrolytical inporoelastic hollow increases. The amplitude of the fluid acoustic andelectromagnetic field will decrease with the permeability increases in fast and slowformation. To the usual model parameters, it shows that the electric field get fromPride equations and that get from quasi-static method has nothing basic difference.So the quasi-static is verified, it means that the problem about fluid saturatedporoelastic hollow cylinder can be solved by quasi-static to improve computingefficiency.