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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.
The main principle in PHC is to store the energy from the external forces influencing the system and dissipate them or reapply them later.Shock absorbers or drill string compensators are simple forms of PHC, so simple that they are normally named heave compensators, while "passive" is used about more sophisticated hydraulic or mechanical systems.
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.
A tower crane is usually assembled by a telescopic jib (mobile) crane of greater reach (also see "self-erecting crane" below) and in the case of tower cranes that have risen while constructing very tall skyscrapers, a smaller crane (or derrick) will often be lifted to the roof of the completed tower to dismantle the tower crane afterwards ...
Bow wave of a canal barge. A bow wave is the wave that forms at the bow of a ship when it moves through the water. [1] As the bow wave spreads out, it defines the outer limits of a ship's wake. A large bow wave slows the ship down, is a risk to smaller boats, and in a harbor can damage shore facilities and moored ships.
“Kinetic energy is converted from wind into waves, and builds up storm waves.” Those can reach up to 15 meters, or 49 feet, he says. Although before you get too alarmed, know that the mean ...
Nothing you can do about it now," one person commented. Another wrote: "This says more about him than you. Don’t let some emotionally immature dingus shake you. You have a right to be annoyed ...
The 2024 Emirates NBA Cup is here and that means the return of one of last season's more divisive additions: the courts.. They're stylized. They're loud. They all feature concentric circles this ...