seyyed mohammad hasheminejad - professor iran university of science and technology
mohammad aryaee panah - B.Sc.student iran university of science and technology
maysam SHABANIMOTLAGH - M.Sc student
yaser mirzaie - teaching staff damavand azad islamic university

A modal acoustic force matrix is formulated for a spherical source undergoing axisymetric socillations in a thermoviscouse acoustic medium. The formulation utilizes the governing equations of epstein and carhart and the analysis method of Guz and golovchan.

thermoviscous, acoustic force, modal impedance, spherical source.