This paper presents a systematic analysis for calculating the velocity potentials
arising in the diffraction and radiation problems due to a submerged sphere in
finite water depth. We have evaluated two very important hydrodynamic coefficients
inherent to the problem. By using the multipole expansion method, the added mass
and radiation damping coefficients are obtained. The mathematics is extremely complex
due to the presence of sophisticated mathematical functions namely, spherical
Bessel functions and associated Legendre functions which play paramount roles in
the solution process. The linear complex algebraic equation plays an important role
in the solution process, which determines the important unknown constants. Once
these constants are determined, the problem is completely solved. We believe that
the combined effects of diffraction and radiation by a submerged sphere in finite water
depth have not been investigated before, and to the best of our knowledge this
has been significantly absent from all the published literature so far. The determination
of the motions using these two coefficients by the combined effects of diffraction
and radiation adds a novelty of advancement to our knowledge in this important area
of research. We have presented our analytical results in a lucid and very systematic
way.