Operability of the Visby class corvette with regards to sea conditions
Publicerad
Författare
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The project Operability of the Visby class corvette with regards to sea
conditions is meant to accomplish two main tasks. First it is to investigate
what a reasonable limit on ship motions on the Visby class corvettes
should be to make sure that the crew remains able to perform their duties
and that all systems are working as required. The second task is
to investigate the operability at each main mission with regard to these
limits, as well as the circumstances of the occasions where the ship fails
with any of the criteria.
The selected criteria focus on human performance. They include Motion
Sickness Incidence (MSI) index to relate motion to cognitive performance
in places such as the bridge, and Motion Induced Interruption (MII)
index to quantify the effect on the ability to perform manual work. A
slamming criterion is also used because of the negative effects on crew
health and comfort. Criteria that focus on ship and system performance
include roll and pitch limits to ensure the capability to launch missiles
and torpedoes, and a submergence criterion for an exhaust pipe opening.
Several relevant mission sets are considered, and one scenario of an escorting
mission to Gotland is presented in a bit more detail, where the
statistical distribution of wave directions for each sea state is taken into
account. It is concluded that the operability, depending on mission and
season, is around 90 %, higher for some missions, particularly when
course deviations are allowed. Most of the criteria are limiting in some
situation with none being obviously over represented.
Beskrivning
Ämne/nyckelord
Operability, Seakeeping, Seakeeping criteria, Strip theory, Naval architecture, Ship motions, Motion induced interruptions