Transmission design for a marine vessel, which includes the design of shafts, selection of bearings, the design of keys and shrink fitted joints, the design of gears and the selection of seals provides a system type of problem. Torsional vibration analysis of power trains is required to assure reliable performance over the operating speed range. A torsional vibration damper is often used to isolate and dampen torsional vibrations. In order to evaluate the drive train vibrations, the torsional stiffness and damping of the damper must be determined. Vehicle design is also a system type of design problem and includes significant human factors.
Product testing plays a key roll in the development of new products.