Fig. 7.

Plot of horizontal nodal displacement [m] versus a position after two time periods of the input excitation ($t=4\mathit{\pi }/\mathit{\omega }$) and b time at position x $=$ 0.42 m for excitation frequency (i) $\mathit{\omega }=200$ Hz, (ii) $\mathit{\omega }=450$ Hz, (iii) $\mathit{\omega }=800$ Hz and (iv) $\mathit{\omega }=1330$ Hz