Arctic stick-slip effects on a simplified moored vessel in head-on ice conditions

Arctic stick-slip effects on a simplified moored vessel in head-on ice conditions

Vogelij, N.A.M.

Huijsmans, R.H.M. (mentor)
Minnebo, J. (mentor)
Keijdener, C. (mentor)

Mechanical, Maritime and Materials Engineering

Offshore Engineering

Floating Structures/Ship Hydromechanics & Structures

2015-03-31

The stick-slip effect is a quasi-static effect that can occur with every mass-spring system that is subjected to significant amount of friction forces. It is based on the difference between the static and kinetic friction coefficient. If the relative velocity between two objects is zero, the sliding object will normally encounter a larger friction force (static) than when the relative velocity is bigger than zero (kinetic). Under certain conditions this friction force can alternate between static and kinetic, which can cause jerky motions between the two sliding objects and finally high spring load peaks. In this study the stick-slip effects on a moored vessel in head-on ice conditions are studied. Although the stick-slip effect in this application will only occur under specific circumstances, it will normally result in large mooring load peaks, which can ultimately have an effect on the mooring system design. A numerical model is created and validated to research the consequences and the probability of the stick-slip effect.

stick-slip
Arctic
Mooring system
numerical model
ice
hydrodynamics

http://resolver.tudelft.nl/uuid:b6deb4bd-9df7-4e7d-a450-abf7ca552026

Student theses

master thesis

(c) 2015 Vogelij, N.A.M.