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22-25 Sept. 1975

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Displaying Results 1 - 25 of 169
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (1071 KB)
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • A flexible sound speed retrieval technique for underwater acoustic models

    Publication Year: 1975, Page(s):1 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (434 KB)

    This paper discusses a recently-developed computer retrieval technique for obtaining useful and reliable sound-speed profiles for applications in underwater acoustic modeling. In addition to selecting a model sound-speed profile, the technique also provides information on the horizontal and vertical characteristics of the sound-speed environment for any combination of temporal and spatial conditio... View full abstract»

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  • Acoustic return from density fluctuations in turbulent jets

    Publication Year: 1975, Page(s):8 - 13
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (502 KB)

    The acoustic scattering from density discontinuities in turbulent jet flows has been studied to determine the conditions under which high frequency acoustic soundings can be useful as a flow field diagnostic tool. Laboratory experiments employing a variable-density turbulent jet exhausting into ambient water are described. The acoustic re turns from the jet at 3 and 6 MHz were correlated with turb... View full abstract»

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  • Bathymetric system performance prediction

    Publication Year: 1975, Page(s):14 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    Equipment selection for bathymetric and sub-bottom profiling applications requires a performance prediction for alternative system configurations. Performance prediction uses the standard sonar equation modified for bathymetric system configurations. The term of the prediction equation that has caused considerable discussion is the transmission loss. A discussion of two transmission loss models is... View full abstract»

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  • Discovery of boric acid as cause of low frequency sound absorption in the ocean

    Publication Year: 1975, Page(s):21 - 24
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (278 KB)

    Laboratory measurements of sound absorption using the resonator technique have confirmed that sound absorption in sea water is about ten times greater than the predicted value and that it is due to boric acid. In conjunction with the acoustic measurements done in a 200 liter spherical glass resonator, the relaxation frequency of the boric acid was measured using the temperature-jump technique for ... View full abstract»

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  • Multi-channel underwater acoustic holographic recording system

    Publication Year: 1975, Page(s):25 - 29
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    We have constructed an experimental underwater acoustic holographic system that uses 100 piezoelectric transducers in a linear receiving array with the object area insonified by a single cylindrical acoustic radiator. The receiving array is swept through the water synchronously with a linear array of 100 light-emitting diodes positioned above the water. The holographic data is parallel-processed i... View full abstract»

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  • Real time processing and display of near-bottom acoustic reflectivity measurements

    Publication Year: 1975, Page(s):30 - 34
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Development of an automated system for quantitative processing of ocean-bottom reflected echo sounder signals is described. This system incorporates a mini computer for digitization, processing and display in real time of the reflection data. The system was developed in conjuction with the Deep Tow project of the Marine Physical Laboratory of Scripps Institution of Oceanography and has been utiliz... View full abstract»

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  • Test results of an experimental holographic acoustic imaging system

    Publication Year: 1975, Page(s):35 - 38
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB)

    A real time experimental holographic acoustic imaging system called "Automatic System for Evaluation and Simulation (ASES)" has been built and tested to assess filled array holographic acoustic imaging systems for underwater viewing. The hardware is described and some of its performance parameters are listed. Qualitative results are given and some quantitative results are discussed. View full abstract»

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  • A boomerang type buoy for measurement of near bottom currents in the deep ocean

    Publication Year: 1975, Page(s):39 - 43
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (274 KB)

    A bottom-mounted deep current measuring system has been developed at the Naval Air Development Center. The system provides long-term, near-bottom current data which is being used to study both the nature and movement of large scale eddies in the near-bottom ocean and the effect of local topographical features on near-bottom currents. The system, termed the ROBOTS CURSOR (Remote, On-the Bottom, Ove... View full abstract»

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  • An economics approach to sonobuoy reliability

    Publication Year: 1975, Page(s):44 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (247 KB)

    The expendable sonobuoy is a complex one-shot device that calls for specialized cost control concepts during production. Lot acceptance is based on sample testing and each rejected lot presents a cost burden to the producer. This paper develops a simple cost model that provides visibility to problem areas and aids in cost justification of product improvement programs to increase reliability. View full abstract»

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  • Arctic environmental buoy system

    Publication Year: 1975, Page(s):50 - 55
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (482 KB)

    The AEB is a remote unattended data acquisition and telemetry system designed for deployment on ice covered seas. The total system as presently configured consists of up to 12 AEBs and a Central Control Station (CCS). The Central Control Station under computer control collects the data from the AEBs, processes the data and formats the data on a digital tape for future analysis. The CCS is also cap... View full abstract»

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  • Development of a meteorological and oceanographic drifting buoy system

    Publication Year: 1975, Page(s):56 - 69
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1403 KB)

    The NOAA Data Buoy Office (NDBO) is actively involved in the development of a meteorological and oceanographic drifting buoy system to provide a basic set of simple meteorological parameters during the First GARP Global Experiment (FGGE). One important aspect of planning for the FGGE is the measurement of near surface conditions (barometric pressure and temperature) from an array of buoys in the S... View full abstract»

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  • Prototype environmental buoy (PEB)

    Publication Year: 1975, Page(s):70 - 78
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (725 KB)

    NDBO is sponsoring a data buoy program to meet the requirements of the National Weather Service (NWS) for environmental monitoring in data sparse marine areas. Initially, six buoys are planned for deployment in the Gulf of Alaska and along the west coast of the United States to provide data to NWS and other organizations involved in making weather forecasts and climatological studies. The buoys wi... View full abstract»

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  • Routine measurement of heave displacement spectra from large discus buoys in the deep ocean

    Publication Year: 1975, Page(s):79 - 87
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (829 KB)

    The Data Buoy Office of the National Oceanic and Atmospheric Administration (NOAA) deployed two 12m diameter discus buoys in the deep ocean in early December 1974. This paper presents a description of the wave measurement hardware and software used on-board the two buoys, and the additional data processing performed on shore. The at-sea comparison tests performed to validate the data are analyzed ... View full abstract»

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  • A new technology for suspended electromechanical cable and sensor systems in the ocean

    Publication Year: 1975, Page(s):88 - 97
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    This paper summarizes a new technology developed explicitly for improved suspended sensor systems in the ocean. It describes briefly the systems approach, analytical techniques, synthetic strength members, cable construction, in-line sensors, fairing, buoyancy, end fittings, conductors, insulation bonding, and cost advantages currently being utilized for improved performance, versatility, and reli... View full abstract»

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  • Application of the finite element method to towed cable dynamics

    Publication Year: 1975, Page(s):98 - 107
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (826 KB)

    This paper deals with towing an object through a fluid by means of a cable. For a slender, neutrally buoyant towbody, the planar configuration of the towed system is determined for steady motion and for time-dependent maneuvers of the towing vehicle . A formulation of the finite element method that applies to towed cable dynamics is presented including bending deformation and stretch of the elemen... View full abstract»

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  • Armor designs offer a wide range of electro-mechanical cable properties

    Publication Year: 1975, Page(s):108 - 115
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    By combining various materials and configurations a broad range of electromechanical cable characteristics is currently available. Because of the combination of high strength with excellent mechanical protection for the electrical core, steel contrahelically armored cables have most frequent use. Other steel strength member configurations are available to vary cable characteristics such as weight ... View full abstract»

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  • Bulkhead connector modification for seawater use over extended periods

    Publication Year: 1975, Page(s):116 - 120
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (469 KB)

    Difficulty was experienced with bulk-head connectors when these were used over a one year period in equipment on the Arctic sea bed. Failures occurred after periods ranging from three to eleven months. Four instrument packages, each fitted with seven XSG-BCL plastic bulkhead connectors, were recovered and examination showed that all the connectors leaked to some extent. In the case of some of the ... View full abstract»

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  • Designs for neutrally buoyant multiconductor cables

    Publication Year: 1975, Page(s):121 - 127
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB)

    A cooperative cable design exercise is described in which the goals were a torque-balanced array cable with 20 conductors, a design strength of at least 15,000 pounds, a maximum diameter of 1 inch, and zero weight in seawater. These goals were to be achieved without increasing normal cable diameter; i.e., with no component the sole function of which was to decrease in-water weight. Three design ap... View full abstract»

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  • Experimental investigation of an electromechanical swivel/slipring assembly

    Publication Year: 1975, Page(s):128 - 132
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Destructive kinking of electromechanical cables, when used to lower heavy objects to the seafloor, has been a serious ocean engineering problem. In an effort to find a solution to these problems, CEL conducted a test and evaluation program on a commercially available swivel/ slipring assembly and a modified version of the same unit. Both units were subjected to mechanical and electrical testing in... View full abstract»

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  • Installation and protection of electrical cables in the surf zone on rock seafloors

    Publication Year: 1975, Page(s):133 - 137
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Alternative techniques for cable installation across rock nearshore zones are introduced. (The nearshore zone is variously defined as extending from the beach to water depths between 30 and 200 m.) The alternative techniques are made possible by new equipment developments in directional drilling of oil wells and in rock trenching. First, it is feasible and sometimes economical to directionally dri... View full abstract»

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  • Lightweight cables for deep tethered vehicles

    Publication Year: 1975, Page(s):138 - 147
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (742 KB)

    Two high strength, low weight, prototype, electromechanical cables have been developed for use in remote control of undersea systems operating to depths of 20,000 feet. Both cables incorporate tension members of KEVLAR-49 as the load-bearing section. Design details are given for each cable. Recommendations are made of the most effective ways to utilize KEVLAR-49 in undersea cables, as well as haza... View full abstract»

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  • Marine corrosion of selected small wire ropes and strands

    Publication Year: 1975, Page(s):148 - 154
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The breakage loads of nine different small mooring lines are experimentally related to time of immersion in a marine environment. Samples of a single steel wire, five different strands ranging from 0.05 inch 1 × 7 to 7/64 inch 1 × 19, and three small wire ropes 3/32 inch 7 × 7 were fully immersed in Puget Sound for 38, 115, and 150 days. Tensile test data from the immersed sam... View full abstract»

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  • Nonlinear analysis of a helically armored cable with nonuniform mechanical properties in tension and torsion

    Publication Year: 1975, Page(s):155 - 164
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A procedure is reported for the stress analysis of straight cables subject to tension and torsion forces. Cables with one end free to rotate, or both ends fixed, are treated. Equations have been derived which are valid for a broad category of cable designs. Individual helical wires may have unique values for elastic modulus, strength and geometrical quantities; compressibility and material nonline... View full abstract»

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