As found earlier in our lab, the first frequency of this plateau is concordant with the front edge of the hearing loss region [24].
The first frequency bin in this case is the bin with k = NFFT/2 + 1.
It is found that 66 comb-like frequency passbands are created in the second frequency unit, maximal relative width difference of which is less than 2×10−5.
In the third frequency range, corresponding to higher modulation frequencies (St⩾Stc), velocity perturbations are dominated by acoustics in most of the experimental domain.
The obtained results show a good agreement between the finite element analysis, equivalent and tests results; the difference in the first two frequencies is less than 4% and less than 10% for the third frequency.
In the first, word frequencies (section "Word frequencies") show that both education and learning appear in the top word lists.
A method to estimate crack extension from a change in the first natural frequency is presented.
The proposed ANN models indicated that increasing plate thickness and compositional gradient exponent resulted in increases in the first 10 frequencies whereas the overlap length has negligible effect.
For a constant notch depth, it is found that there is a substantial reduction in the first six frequencies as notch angle decreases.
One general observation is the substantial reduction in the first six frequencies as the sector angle increases for all plates, except in the first two modes of plates having free free radial edges.
The frequency band under consideration lies in the neighborhood of the first natural frequency of the tube where shock waves are known to appear.
