Design considerations for stretch conductors in oceanographic moorings
A copper conductor formed into a helical configuration like a telephone cord can stretch by extending its geometry without elongating the conductor itself. This report establishes the proper configuration of copper conductors arranged in a helical pattern around a fiber core which can be used as center of a nylon rope with at least 20 percent working stretch. The calculation procedure allows the determination of the conductor's helix angle or pitch as function of the required assembly elongation, the cable assembly's geometry, and the fiber core's Poisson ratio. Limits of the geometry are established to assure defined flexibilty of the cable assembly to allow bending of a surrounding fiber rope without conductor layer blockage. A sample stretch conductor assembly was procured and initial testing is described, proving the calculation method's ability to determine the correct geometry of the conductor assembly. Such conductor assemblies can be used as conductive core of nylon ropes suitable for coastal and deepsea buoy moorings or as lift or trigger lines for instrumentation. They are also considered the most suitable configuration which can endure the high stretch requirements of embedded conductors in a stretch hose wall at its transition into a coupling section.
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Iselin, Columbus O’Donnell (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1936-08)With the opening of the Woods Hole Oceanographic Institution in July 1931, there was inaugurated a program of investigations in the deep waters of the western North Atlantic for which there had long been a great need. ...
A study of ocean wave statistical properties using nonlinear, directional, phase-resolved ocean wave-field simulations Henry, Legena Albertha (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-02)In the present work, we study the statistics of wavefields obtained from non-linear phase-resolved simulations. The numerical model used to generate the waves models wave-wave interactions based on the fully non-linear ...
Vertical distributions of temperature and humidity over the ocean between Nantucket and New Jersey Emmons, Gardner (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1947-12)This paper is concerned with the results of a series of airplane psychrometer soundings that were made over the ocean up to a height of 1500 ft during June, 1945. These soundings and previous soundings already described ...