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Active heave compensation (AHC) is a technique used on lifting equipment to reduce the influence of waves upon offshore operations. AHC differs from Passive Heave Compensation by having a control system that actively tries to compensate for any movement at a specific point, using power to gain accuracy.
These can be extremely small and light while retaining significant strength due to the lack of moving parts. A swing cheek block is a special kind of block which can be opened to engage with a bight, without the necessity to thread the rope through the block or remove the load from the end of the rope. The snatch block is also the load lifting ...
A simple way of considering wave-making resistance is to look at the hull in relation to bow and stern waves. If the length of a ship is half the length of the waves generated, the resulting wave will be very small due to cancellation, and if the length is the same as the wavelength, the wave will be large due to enhancement.
Hull speed can be calculated by the following formula: where is the length of the waterline in feet, and is the hull speed of the vessel in knots. If the length of waterline is given in metres and desired hull speed in knots, the coefficient is 2.43 kn·m −½.
To achieve its top speed the ship has to be traveling in waters not exceeding sea state 3, waves up to 1.25 m (4.1 ft) high. At sea state 4 it can travel at up to 15 knots, at only 5 knots in sea state 5, and has to hold position in any higher sea state. This reflects the ship's purpose of operating close to shore rather than in "blue water". [17]
An example is counterweights. Often a crane will be followed by another truck hauling the counterweights that are removed for travel. In addition some cranes are able to remove the entire upper. However, this is usually only an issue in a large crane and mostly done with a conventional crane such as a Link-Belt HC-238.
These “internal waves,” as he calls them, create vortices which bring colder water from the depths of the ocean higher up — important for the planet’s climate.
The Klann linkage is supposed to provide many of the benefits of more advanced walking vehicles without some of their limitations. It can step over curbs, climb stairs, or travel into areas that are currently not accessible with wheels but does not require microprocessor control or multitudes of actuator mechanisms.