4 - Memorial University of Newfoundland DAI

the basis upon which the irregular wave spectra xrre sinnulatcd by the wave
maker system.
Two different spectra were used in the tests: I) s white noise spntnsn.
and 2) a JONSWAP spectrum. The sp~clrsl deruity equations d lo CBt!c
these respective spectra are:
for the white noise spectrum, where: H, is the significant wiwc hcidlt, AJ
is the frequency rmlution of tho signal, and J... is lhc mnxim!~nn co#l.u(l
frequency. (In the aporimenl, H, was o t oqtml to 16 c m and J . I.! Ilr.)
For the JONSWAP spectrum.
where
SJ(J) = +exp(-;)ya, I (6.2)
a = u p [*I,
o = 0.07 for J S Jo,
and where: Jo is the pesk frequency; I/. is the significant wsvc hsighl; and
7 is s enhancemen1 fsct~r.~ (Tho values uanl for 11.,7, and JO in thc
experiments are: 10 em, 1.0, and 0.6 Hz, respectively.)
Two d iht spectra were d for the fallawing -nc
211 7 = 1, equalion (6.2) i@ mdud to a Pirmn Mwkwit maturn.
111