Accession Number : AD0732368

Title :   Motion of Freely Suspended Loads Due to Horizontal Ship Motion in Random Head Seas.

Descriptive Note : Technical note Mar-May 71,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Zwibel,Harry S.

Report Date : OCT 1971

Pagination or Media Count : 29

Abstract : A theory is developed for the swinging motion induced in a wire suspended load due to the horizontal motion of a ship. An explicit formula is obtained for the significant amplitude of horizontal load motion when the ship is exposed to random head seas. Numerical results are presented for two typical cargo ships in a sea state three. It is found that very large motions are suffered by the load. For critical line lengths, resonance effects magnify the ship motion by several orders of magnitude. These results will be used to assist in the development on-loading and off-loading devices for cargo vessels in open beach operations.

Descriptors :   (*CARGO SHIPS, OCEAN WAVES), (*CARGO, EQUATIONS OF MOTION), VIBRATION, MATHEMATICAL MODELS, STATISTICAL ANALYSIS, HANDLING

Subject Categories : Marine Engineering
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE