Wave Impact Loads on Cylinders
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The evolution of forces acting on horizontal cylinders subjected to impact by a sinusoidally oscillating free surface was investigated both theoretically and experimentally. The experiments were conducted in a large V-shaped tunnel, with cylinders 3 to 8 in. (76 to 203 mm) in diameter. The results are expressed in terms of three force coefficients: (1) the general slamming coefficient that expresses the normalized force acting on the cylinder at any time after the impact, (2) the normalized impact force at the initial instants of slamming, and (3) the maximum drag coefficient that occurs when the cylinder is immersed in water about 1. 8 diameters. The slamming-force coefficient was found to equal 3.2. Also, the force experienced by the cylinder cannot be considered independently of the dynamic response of that· cylinder. In fact, the slamming-force coefficient may be amplified to a value as high as 6.3 through the dynamic response of the cylinder and its supports.
Paper first presented at the Tenth Annual Offshore Technology Conference, held in Houston, May 8-11, 1978.
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