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IEEE Journal of Oceanic Engineering

Issue 4 • Date Oct 1995

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Displaying Results 1 - 14 of 14
  • On-line sensing system of dynamic ship's attitude by use of servo-type accelerometers

    Publication Year: 1995, Page(s):339 - 346
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    For an accurate automatic measurement of ship's attitude the paper proposes an intelligent online sensing system which uses four servo-type accelerometers and one servo-type inclinometer appropriately located on the ship. Through an adequate location of the accelerometers, the heaving, rolling, and pitching signals of the ship are separated from each other with adequate linear combinations of the ... View full abstract»

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  • The spatial variability of surface reverberation under high and low wind speeds

    Publication Year: 1995, Page(s):337 - 339
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    Two-dimensional images of broadband ocean reverberation in deep water have been made from explosive source data. The effective spatial resolution is 1 m×10 m for the frequency band of 120-1430 Hz. This paper presents two typical images for wind speeds of 4 and 17 ms-1 . The high wind case exhibits substantial spatial variability on the scale of 100 meters that is not observed in t... View full abstract»

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  • Shallow-water sound transmission measurements on the New Jersey continental shelf

    Publication Year: 1995, Page(s):321 - 336
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1452 KB)

    Calibrated acoustic measurements were made under calm sea state conditions on the New Jersey shelf near the AMCOR 6010 borehole, a surveyed area with known geophysical properties. The experiment was conducted in 73 m water with supporting measurements of salinity, temperature, and sound speed. Acoustic measurements were obtained with a vertical array of 24 hydrophones spaced equally at 2.5 m inter... View full abstract»

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  • Comments on “Standard definitions for sound levels in the ocean”

    Publication Year: 1995, Page(s):367 - 368
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    For original paper see Carey, ibid., vol. 20, pp. 109-113 (Apr. 1995). This communication provides a generalization of and makes further comments on the original paper. Although the time average acoustic intensity expressions were derived under a far field assumption, it is valid to reference continuous sound sources to time-averaged intensity levels at a distance of 1 m as described. The present ... View full abstract»

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  • Experimental investigation of the combustive sound source

    Publication Year: 1995, Page(s):311 - 320
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    In this paper, we describe a unique low frequency underwater sound source called the combustive sound source (CSS). In this device, a combustible gas mixture is captured in a combustion chamber and ignited with a spark. The ensuing combustion produces expanding gases which in turn produce high intensity, low frequency acoustic pulses. With high-speed motion pictures of the CSS event, we relate the... View full abstract»

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  • Advances in the state of the art for AUV inertial sensors and navigation systems

    Publication Year: 1995, Page(s):361 - 366
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    This paper presents an overview of two new inertial systems that are now in production at the Guidance and Control Systems Division of Litton Systems, Inc. These units are small, lightweight, require little power, and are silent. Data are presented that show long-term performance as well as short-term attitude, position, and velocity reference data for the LN-100 system. Attitude, velocity, and bo... View full abstract»

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  • On optimum turning configurations with fixed-fin stabilization

    Publication Year: 1995, Page(s):268 - 275
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    Linear turning theory is applied to find the fixed fin size and location that optimize turning performance, for a given degree of stability. It is shown that configurations having the same stability can be designed with a range of turning ability, and vice versa View full abstract»

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  • Beamforming on seismic interface waves with an array of geophones on the shallow sea floor

    Publication Year: 1995, Page(s):300 - 310
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1028 KB)

    The problem of locating very low frequency sound sources in shallow water is made difficult by the interaction of propagating acoustic waves with the sea floor. Slow wave speeds and the attendant short wavelengths suggest that low frequency beamforming and source localization with sea floor geophones can be accomplished with relatively small arrays when compared with hydrophone arrays in the water... View full abstract»

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  • Isolation of resonance in acoustic backscatter from elastic targets using adaptive estimation schemes

    Publication Year: 1995, Page(s):346 - 353
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    It has been shown that at certain frequencies the acoustic backscatter from elastic targets exhibits certain resonance behavior which closely relates to the physical properties of the target such as dimension, thickness, and composition. The purpose of this paper is to develop an automated approach for identifying the presence of resonance in the acoustic backscatter from an unknown underwater tar... View full abstract»

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  • An assessment of fuzzy logic vessel path control

    Publication Year: 1995, Page(s):276 - 284
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    A fuzzy logic controller for ship path control in restricted waters is developed and evaluated. The controller uses inputs of heading, yaw rate, and lateral offset from the nominal track to produce a commanded rudder angle. Input variable fuzzification, fuzzy associative memory rules, and output set defuzzification are described. Two maneuvering situations are evaluated: track keeping along a spec... View full abstract»

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  • Toward an improved understanding of thruster dynamics for underwater vehicles

    Publication Year: 1995, Page(s):354 - 361
    Cited by:  Papers (59)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    This paper proposes a novel approach to modeling the four quadrant dynamic response of thrusters as used for the motion control of ROV and AUV underwater vehicles. The significance is that these vehicles are small in size and respond quickly to commands. Precision in motion control will require further understanding of thruster performance than is currently available. The model includes a four qua... View full abstract»

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  • A method for estimating the sub-wavelength sway of a sonar towfish

    Publication Year: 1995, Page(s):258 - 267
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    The essentially random motion of the towfish in a side scan sonar system limits the fidelity of the resultant image. Although corrective techniques have been developed to deal with the gross departures from a set of regular amplitude versus range samples along a straight locus as well as the gross rotational errors, sub-wavelength displacement errors are mostly ignored. This paper suggests a techn... View full abstract»

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  • Acoustic scattering by an air-bubble near the sea surface

    Publication Year: 1995, Page(s):285 - 292
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    If the air bubble is near, and strongly interacting, with the (flat) surface of a liquid half-space, then the scattering cross section (SCS) of the bubble differs substantially from its value far-away from the interface. We present the exact solution for this scattering problem which is valid for any incidence direction of the (plane) sound waves, and for any bubble depth, obtained by the general ... View full abstract»

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  • Performance analysis of digital acoustic communication in a shallow water channel

    Publication Year: 1995, Page(s):293 - 299
    Cited by:  Papers (52)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The major obstacle to underwater acoustic communication is the interference of multi-path signals due to surface and bottom reflections. High speed acoustic transmission over a shallow water channel characterized by small grazing angles presents formidable difficulties. The reflection losses associated with such small angles are low, causing large amplitudes in multi-path signals. In this paper we... View full abstract»

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Aims & Scope

The IEEE Journal of Oceanic Engineering (ISSN 0364-9059) is the online-only quarterly publication of the IEEE Oceanic Engineering Society (IEEE OES). The scope of the Journal is the field of interest of the IEEE OES, which encompasses all aspects of science, engineering, and technology that address research, development, and operations pertaining to all bodies of water. This includes the creation of new capabilities and technologies from concept design through prototypes, testing, and operational systems to sense, explore, understand, develop, use, and responsibly manage natural resources.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
N. Ross Chapman
School of Earth & Ocean Sciences
University of Victoria
3800 Finnerty Road
Victoria, BC V8P 5C2 Canada
chapman@uvic.ca