4 - Memorial University of Newfoundland DAI

theoretical results computd using the non-linear form of Morrison's wave
forcc equalion ~imulata lhs experimental value8 more closely than with that
ohtnind with the linenriled form. (The results from the linear analyses
arc .lightly higher.) b m these results, lhe workability of the experimental
rnodel wit11 its mociatd inatrumentation, and the computer model were
mccrtaind.
Response to Irregular Waves
Ilcmnant frequeneio for the i~regular wave indued vibration investigations
lor the whik noise and JONSWAP teats are epitomized in Tables 8.1-8.8.
'fhose values wero computed using equation (6.34). in Chapter 6 (i.e.,the
Maximum Entropy cxprasian). I1 is not suggested that catimstes of resonant
fmqttcnciescould not be taken directly from thespectral density graphs. The
major impediment, though, is that the accuracy would be very dependent
otn tltc sn~npling frequesey, Af, because all the spectral density ordinates
will OCCII~ at ii.tervals of Af apart. Notwithstanding, when atimates of
resonan1 Irqueneia are obtained by solving for the mots ofequation (6.34),
thc accuracy is improved, for it depends on the tolerance (i.e., the maximum
doviation of tltc function fmm zero) specified in Muller's algorithm3.
Results from White Noise Tests. Results of the structural response
(nccelerntian) to the white neiae input wavespectrum werepreaented in Fig-
toms 1.56-7.60. For the intact structure, resonant peaks are well defined. For
nccclcromders A1 and A2, relative extrema, points oeeur at about 1.08 He.
"ic, llle IMSL nunlmical arhcmc noted csrlier on pas* 132, Chapter 6, uaed to salve
ror ille ,=.,*.