- The action of the verb to spring.
- A set of springs in a vehicle, etc.
- countable archaic A
of an arch.
- That springs or spring.
Springing as a nautical term refers to global
vertical resonant hull girder vibration due to oscillating wave
loads along the hull
of springing is not yet fully understood due to the
complex description of the surface waves and structure interaction.
It is, however, well known that larger ships with longer resonant
periods are more exposed to this type of vibration. Examples of
this include very large crude
carriers and bulk
carriers above 250 meters in length.
In the extreme cases it may cause severe fatigue
cracking of critical structural details, especially in moderate to
rough head seas with low peak periods. Ballast condition is
normally more easily excited by waves than cargo condition, hence
the trade will also matter.
The first experience with this phenomenon is
related to fatigue cracking on Great Lakes
s (700 feet) during the 1950's. Later 1000 feet Great
Lakes bulk carriers experienced the same problems even if the
strength requirements became stricter. Ocean
have not had this problem until recently, when high tensile steel
was introduced as a common material in the whole ship to reduce the
initial costs. This makes the ships less stiff and the nominal
stress level higher.
Today's ship rules does not account for this
effect which may dominate the contribution to fatigue for some