【摘要】 基于微扰理论研究了边侧面为刚性,上、下底面应力自由的圆柱体谐振腔内存在同轴圆柱扰动体的声速求取问题,得到圆柱扰动体存在时谐振腔的声势与共振频率的表达式;在此基础上,给出了应用迭代法与间接法求取扰动体声速的实例;结果表明,利用共振声谱法求取扰动体声速是可行的,间接法比直接法更适于低频岩石声速的测量.更多还原

【Abstract】 In this paper, the problem of obtaining the acoustic velocity of a small coaxial cylinder in a resonance cylindrical cavity is discussed on the basis of the perturbation theory. Analytical expressions, in a cylindrical cavity with the rigid walls and traction-free ends, are derived for the acoustic resonance frequency shifts caused by the inclusion of a coaxially small cylindrical samples. Two kinds of methods, iterative method and indirect method, for getting the acoustic velocity of an inner cylinder are probed into theoretically. The results show that these methods are feasible. Results show that the indirect method is better than iterative one in solving the problems of rock velocity measurements in low frequency.更多还原