Accession Number : AD0707692

Title :   A THEORETICAL AND EXPERIMENTAL INVESTIGATION OF IMPACT LOADS IN STRANDED STEEL CABLES DURING LONGITUDINAL EXCITATION,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON D C INST OF OCEAN SCIENCE AND ENGINEERING

Personal Author(s) : Goeller,Jacques E. ; Laura,Patricio A.

Report Date : APR 1970

Pagination or Media Count : 38

Abstract : One of the problems encountered in supporting large payloads by a cable system exposed to longitudinal excitation simulating ocean wave motion is referred to as cable snap. This is due to a combination of wave amplitude and frequency that causes slack in the cable which subsequently becomes taut and experiences a severe impact load. This phenomenon has been modeled on an analog computer assuming elastic behavior of the cables and nonlinear damping of the payload and cable. A mathematical model which considers segmented viscoelastic cables is also considered in the present paper. Experiments were performed on 0.0625 inch and 0.09375 inch stranded steel cables of length up to 70 feet with a 27 pound spherical payload attached to the lower end. The cable system was suspended in a tank to a water depth of 65 feet and excited sinusoidally at the top at amplitudes of one to three inches and frequencies from zero up to 3Hz. The cable forces at the top and bottom of the cable were monitored by load cells. (Author)

Descriptors :   (*MECHANICAL CABLES, LOADS(FORCES)), (*OCEAN WAVES, MECHANICAL CABLES), IMPACT SHOCK, STEEL, EXCITATION, MOTION, SIMULATION, MATHEMATICAL MODELS, VISCOELASTICITY, FORCE(MECHANICS), NYLON, STRESSES, PAYLOAD, COMPUTER PROGRAMMING, TEST METHODS, DEEP WATER

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE