ship motion

ship motion

[′ship ‚mō·shən]
(engineering)
Translational and rotational motions of a ship in a wave system which cause the center of gravity to deviate from simple straight-line motion; these motions are heave, surge, sway, roll, pitch, and yaw.
References in periodicals archive ?
SACS' built-in input interface for environmental parameters, such as wind, current, and wave and ship motion data, allowed for calculation of the potential force on the structure and ensured the cylinders could withstand a variety of elements.
The company's unique modeling and simulation process, for example, analyzes ship motion and the associated aircraft reactions to help navies select the optimal naval aircraft handling systems for their requirements.
Although this paper is not intended to push forward modelling of a vessel response to a rudder, a propeller, and external forces, we make use of a ship motion model and this part of our work is one of the key issues.
The design of course controller is an important research topic of ship motion control, because it is related to not only the economy and security of the ship's operation, but also the foundation of USV's autonomous navigation.
Development of the WISDAM code for ship motion simulations
LNG shippers who use this product will benefit from Seaware operational decision support that incorporates components of ship motion, stability, weather, and sea state.
Ship motion dynamics is related greatly to the navigational conditions such as loading and draft; the changes of dynamics also are influenced by environmental disturbances such as wind, wave, and current.
They go from a basic bridge system that has yet to be tried on a vessel to a complex package of hydraulics that compensate for ship motion. In the same area, but not under the Accelerator programme, is the Maxccess system (see box below).
The work has been carried out by the maritime research consultancy Cetena, which has a history of designing individual ship motion monitoring systems, and implemented using standard CompactRio and LabView from National Instruments by the Genoa-based systems integrator Sitem.
In this particular ship motion model, an extra term is added due to the ship movement along the z-axis and it depends on the period [T.sub.osc] of the sea surface motion.
Horizontal force F' as produced by ship motion at speed [v.sub.y] in Y direction (abeam) could be calculated as follows:
Thales is responsible for the landing system per se, the rotorcraft system as well as for the trajectory control system, while DCNS is in charge of 'ship motion prediction', deck landing strategy and for the system needed to secure the aircraft on the deck.