Table 2: (a) Acoustic mode convergence for various amplitudes (1st resonant frequency). (b) Acoustic mode convergence for various amplitudes (2nd resonant frequency).

(a)

No. of acoustic modes = 1 4 9 0.64363 0.64348 0.64348 0.6 0.66148 0.66140 0.66139 1 0.67762 0.67759 0.67759 1.4 0.68723 0.68721 0.68721

(b)

No. of acoustic modes = 1 4 9 1.07985 1.07786 1.07781 0.6 1.19770 1.19539 1.19534 1 1.40935 1.40661 1.40655 1.4 1.67018 1.66715 1.66709