Lecture 18: Mod-01 Lec-18 Motions in Short-Crested Sea
Lecture Details :
Seakeeping and Manoeuvring by Dr.Debabrata Sen,Department of Ocean Engineering & Naval Architecture,IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Course Description :
Seakeeping : Regular water waves definition of ship motions single degree of freedom motions in regular waves uncoupled heave, pitch and roll motions coupled heave and pitch motions irregular waves - description of long crested waves by 2D spectrum ship motions in 2D irregular waves description of short-crested sea ship motions in 3D irregular waves dynamic effects deck-wetness, slamming, relative motions, sea-sickness etc. added resistance in waves roll stabilization
Manoeuvring : Types of directional stability - linear equations of motions in horizontal plane hydrodynamic derivatives stability index standard manoeuvres turning circle, zigzag, pullout and spiral manoeuvres roll during turn experimental determination of hydrodynamic derivatives straight-line, rotating arm and PMM experiments description of control surface (rudder) control derivatives.