Question: ) Mean secondorder wavedrift force (sway) A practical hand estimate for a bluff barge in beam seas: F_drift (1/8) g B L (H/) C_drift H/

) Mean secondorder wavedrift force (sway) A practical hand estimate for a bluff barge in beam seas: F_drift (1/8) g B L (H/) C_drift H/ = 2.01 / 103.9 = 0.0193; (H/) = 3.73e4 Take C_drift = 0.8 F_drift (1/8)10259.8140803.73e40.8 12.0 kN (mean toward wave source) 5) Heave/roll/pitch natural periods (resonance screen) Displacement volume L B T = 80404 = 12,800 m Displacement mass m = 1.31 10^7 kg Waterplane area Aw L B = 3,200 m Heave natural period Tz 2 sqrt(m / ( g Aw)) = 2 sqrt(1.31e7 / (10259.813200)) 6.4 s Transverse metacentric height GMt: for boxy barge, BMt Iwp/ with Iwp L B/12 Iwp = 8040/12 = 4.27 10^5 m BMt = Iwp/ = 4.27e5 / 1.28e4 33.4 m With KG say 3.5 m and KB T/2 = 2 m GMt

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