Analytical approach to evaluate transmission loss of finite rectangular plate considering its eigenmodes.

Abstract

In this research, theoretical transmission losses (TL) of finite flat plate with simple support, clamped, and free boundary condition are derived considering eigenmodes of the plate by modal expansions. Theoretical TLs are demonstrated to agree well with those obtained by numerical approach. Compared with TL by mass law, TL decrease at eigen frequencies of the panel and exhibits almost constant value at certain frequency range below coincidence frequency. This frequency band ranges from the frequency where the radiation efficiency exceeds 1 to the coincidence frequency.