FIELD AND IMPEDANCE OF AN OSCILLATING SPHERE IN A VISCOELASTIC MEDIUM WITH AN APPLICATION TO BIOPHYSICS
FIELD AND IMPEDANCE OF AN OSCILLATING SPHERE IN A VISCOELASTIC MEDIUM WITH AN APPLICATION TO BIOPHYSICS
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DOI：
10.1121/1.1906828
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发表时间：
1951-01-01
影响因子：
2.4
通讯作者：
OESTREICHER, HL
中科院分区：
文献类型：
--
作者：
OESTREICHER, HL
本文对弹性、粘性和弛豫介质中波的传播作了唯象分析。特别是研究的是能量转移到这样的介质通过计算的机械阻抗的谐波振荡的球形辐射器。作为一个例子，该阻抗公式被数值评估，并绘制为具有剪切弹性、剪切粘度和人体肌肉组织的可压缩性的弹性、粘性介质的频率的函数。球体在这种介质中的阻抗约为。描述了人体肌肉组织在满足各向同性、均匀性（波长<组织结构）、连续性（忽略空化效应）和弹性“常数”恒定性（忽略松弛效应）的假设的频率范围内的实际行为。
A phenomenologi-cal analysis of the wave propagation in a medium with elastic, viscous, and relaxational properties is presented. Studied in particular is the energy transfer to such a medium by computing the mechanical impedance of a harmonically oscillating spherical radiator. As an example, this impedance formula is numerically evaluated and plotted as a function of frequency for an elastic, viscous medium having the shear elasticity, shear viscosity, and compressibility of human muscle tissue. The impedance of the sphere in this medium will approx. describe the actual behavior of human muscle tissue in a frequency range in which the assumptions of isotropy, homogeneity (wavelength < structure of tissue), continuity (neglecting cavitation effects) and the constancy of the elastic"constants" (neglecting relaxa-tional effects) are fulfilled.