THE EFFECT OF ANTIPITCHING FINS ON THE MOTIONS AND VIBRATION OF A LARGE AIRCRAFT CARRIER.
Abstract
The effect of ship motions on the useful operational time of an aircraft carrier is discussed. The ship is assumed to be in regular sinusoidal waves and the linearized pitch and heave equations are solved with the help of a digital computer. The results are compared with those found in the towing tank with a model. The effect of an antipitching fin is discussed and solved for in the linear equations. These results are compared with those from tank tests. Various types of activation of the fin are tested with the linear theory computer program to improve the performance of the fin. Vibration of the bow due to ventilation of the fin was observed in tank tests and a pressure relieving hole was tested in the towing tank as a possible means of reducing this vibration. Since two of the criteria for operation in rough seas are the vertical excursion and vertical velocity of the touchdown point, the effect of the fin in reducing the motion of this point is calculated for sea state six and a ship speed of twenty-four knots. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1964
- Accession Number
- AD0612467
Entities
People
- Damon E. Cummings
Organizations
- Massachusetts Institute of Technology