Lw. Anson et Rc. Chivers, ULTRASONIC SCATTERING FROM SPHERICAL-SHELLS INCLUDING VISCOUS AND THERMAL EFFECTS, The Journal of the Acoustical Society of America, 93(4), 1993, pp. 1687-1699
An analysis for sound scattering and attenuation by shell structures i
mmersed in fluids is outlined. While the form of the analysis permits
easy comparison with previous results for simple spheres, it includes
novel features of viscoelasticity in the shell and core materials (whi
ch may be fluid or solid), viscosity in the suspending fluid, and ther
mal effects. The computational procedure adopted is outlined with part
icular reference to the avoidance of numerical instabilities at very l
ow and very high values of ''ka.'' The testing of the program by compa
rison with previous results on simpler systems is reported, and a limi
ted selection of numerical results is given. The program has been used
successfully over the range of ka values between 10(-6) and 200, its
robustness needs closer definition.