Table 3.

The values of T associated with the four standing wave frequencies for the comb-like structure with a=7 calculated from Fourier series expansion with the convergence established by increasing the number of modes used.

N	2	5	10	20	40
T	−0.0068	−0.0066	−0.0066	−0.0066	−0.0066
T	−0.0704	−0.0687	−0.0686	−0.0686	−0.0686
T	−0.2877	−0.2843	−0.2849	−0.2856	−0.2860
T	−2.2022	−2.3602	−2.4267	−2.4628	−2.4816