Hull Vibration Analysis
Hull vibrations are a special case in which the hull as a beam is often resonant at some excitation frequency, such as a propeller blade passing, or propeller shaft rotational.
We can survey the hull vibratory motions underway and determine the mode shape, either vertical or athwartships, but quite often this is a function of the hull structure and not easily changed. Sometimes, the problem can be solved via changing the number of propeller blades, or isolating the engine on resilient mounts.
