Environmental Engineering Reference
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data simulation and LSS-PC is plotted in Fig.7.11. It is seen that the
maximum normalized difference is nearly 1%.
The error due to the order of the interpolating Fourier series is shown
in Fig.7.12 with the input amplitude 0.5A, It is observed that an increase
in the order of the interpolating Fourier series lowers the error.
The computational efficiency is demonstrated in Fig.7.13 where the
CPU time is plotted as a function of the number of simulation windows.
The CPU time is measured for both sampled-data simulation and LSS-
PC programs coded in Matlab, an interactive mathematical language
that runs in an interpretive mode [71]. The program was executed on
Sun Ultra 1 workstation with 450 MHz CPU and 256MB RAM. It is seen
the initial cost of computation of sampled-data simulation is higher than
that of LSS-PC, mainly due to the cost of the pre-processing step. The
CPU time of LSS-PC analysis arises rapidly with the number of simu-
lation windows, whereas that of sampled-data simulation arises slowly,
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