Ship motions have physiological effects on ship passengers and crew.

Ship motions, an example in a vehicle.

Ship motions are defined by the six degrees of freedom that a ship, boat or any other craft can experience.

It has also been shown that most people acclimate to ship motions within a period of about four days, but some never acclimate at all.

Excessive ship motions may hinder the vessel's ability to complete its mission such as the deployment and recovery of small boats or aircraft.

RAOs are usually calculated for all ship motions and for all wave headings.

He was initially employed at Marconi Radar to advise the company on aspects of ship motions and ship design.

Ship motions are important for determining dynamic loading on the crew, passengers, ship system components, secured cargo, and structural elements.

Ship motions are considered when determining the principal dimensions of the ship and in developing the general arrangements of the ship's internal spaces.

The RAO transfer function is only defined when the ship motions can be assumed to be linear.

It is common to only consider the absolute value of the RAO if the phase between the excitation and the ship motions are irrelevant.

Dunnage segregates cargo in the hold and prevents shifting of the cargo in response to ship motions.

Ship motions - involves motions of the vessel in seaway and its responses in waves and wind.

For example, in most vessels the far forward parts of the ship experience the worst ship motions and are commonly unacceptable for berthing passengers or crew.

The magnitudes and accelerations of ship motions, (particularly heave, roll and pitch) have adverse effects on passengers and shipboard personnel.

Involves measurements of ship motions in various sea states followed by a series of analyses to determine comfort levels, likelihood of sea sickness and hull damage.

These are based on the ship motions and the accelerations experienced, and include comfort criteria such as noise, vibration and sea sickness, performance based values such as involuntary speed reduction, and observable phenomena such as bow immersion.

Ships today still use the process of adaptation and variation that has been used for hundreds of years, however computational fluid dynamics, ship model testing and a better overall understanding of fluid and ship motions has allowed much more in-depth analysis.

In exceptional cases where ship motions pose a threat to crew, structure or machinery, or when ship motions interfere with the ability of the ship to accomplish its mission, then the design must be modified so that ship motions are reduced.