【摘要】 基于共振声谱法,研究了同轴孔隙性圆柱扰动体引起圆柱谐振腔共振频率的偏移.首先求取无孔隙圆柱扰动体存在时谐振腔声势与共振频率的表达式,然后采用等效速度和等效密度的方法确定孔隙性扰动体存在时谐振腔共振频率的偏移,得到了理论模拟曲线.数值模拟结果表明,该方法是可行的,适用于低频范围内孔隙性岩石的孔隙度和孔隙流体声参数的测量.更多还原

【Abstract】 In this paper,the problem of the acoustic resonant frequency shift of a cylindrical cavity with a coaxial porous sample is discussed on the basis of the resonance acoustic spectroscopy.Firstly,Analytical expressions of the acoustic pressure and resonant frequency of the cylindrical without the sample are derived.And the acoustic resonant frequency shift of the cylindrical cavity with a coaxial porous sample is obtained by use of the equivalent velocity and equivalent density.According to the simulation curves,the result shows that the method works in determining the resonant frequency shift caused by the porous sample and can be used in solving the porosity and acoustic parameters measurement of porous rock core in low frequency.更多还原