The torsional vibration of a marine

The torsional vibration of a marine propulsion shafting
system may cause shafting failures and should thus be carefully considered at the design stage. The regulations of many
shipping registers [2-5] require that torsional vibration of the
shafting system should be calculated at the design stage, and
then measured during sea trials. There are many instruments available to measure torsional vibration, such as the Geiger
torsiograph, the electrical torsiograph, the laser torsiograph
and electrical strain-gauging equipment. Electrical torsiographs are widely used nowadays, and the vibration pick-up of
this system is usually located at the free-end of the shafting
system