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A flexible configuration for an array of sensors has been developed for measurements in energetic regions of the ocean where the flow has high spatial and temporal variability. Central to the system is a two-axis electromagnetic current meter that measures the flow through a ducted volume containing a uniform magnetic field and nonprotruding electrodes flush with the duct surfaces. This geometry minimizes the electrode boundary-layer effect on the output, thus improving calibration and reducing fouling and damage potential. An inexpensive amplifier designed for low signal-to-noise ratios is employed to produce very low zero drift during operation 相似文献
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Feezor M.D. Yates Sorrell F. Blankinship P.R. Bellingham J.G. 《Oceanic Engineering, IEEE Journal of》2001,26(4):515-521
Central to the successful operation of an autonomous undersea vehicle (AUV) is the capability to return to a dock, such that consistent recovery of the AUV is practical. Vehicle orientation becomes increasingly important in the final stages of the docking, as large changes in orientation near the dock are impractical and often not possible. A number of homing technologies have been proposed and tested, with acoustic homing the most prevalent. If AUV orientation is required as well as bearing and distance to the dock, an acoustic homing system will require high update rates, and extensive signal conditioning. An Electromagnetic Homing (EM) system is one alternative that can provide accurate measurement of the AUV position and orientation to the dock during homing. This system offers inherent advantages in defining the AUV orientation, when compared to high frequency acoustic systems. The design and testing of an EM homing system are given, with particular attention to one can be adapted to a wide class of AUVs. A number of homing, docking, and latching trials were successfully performed with the design. Homing data include dead reckoning computation and acoustic tracking of the homing track, and video documentation of homing into the dock 相似文献
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Feezor M.D. Yates Sorrell F. Blankinship P.R. 《Oceanic Engineering, IEEE Journal of》2001,26(4):522-525
Central to the successful operation of an autonomous undersea vehicle (AUV) is the capability to return from a mission, in that there is consistent recovery or docking of the AUV. In addition, some missions may require communication with and power transfer to the AUV after docking. This paper describes an inductive system that provides a nonintrusive power and communications interface between the dock and the AUV. The system makes up to 200 W of AC or DC power available to the AUV. The communications interface is 10BaseT Ethernet and is platform- and protocol-independent. The overall design of the system is given as well as results from wet laboratory and field tests 相似文献
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Bradley A.M. Feezor M.D. Singh H. Yates Sorrell F. 《Oceanic Engineering, IEEE Journal of》2001,26(4):526-538
In this paper, we examine the issues involved in designing battery systems and power-transfer (charging) techniques for Autonomous Underwater Vehicles (AUVs) operating within an Autonomous Ocean Sampling Network (AOSN). We focus on three different aspects of the problem, battery chemistry, pack management and in situ charging. We look at a number of choices for battery chemistry and evaluate these based on the requirements of maximizing power density and low temperature operation particular to AUVs. We look at the issues involved in combining individual cells into large battery packs and at the problems associated with battery monitoring, and the charging and discharging of packs in a typical AUV application. Finally, we present a methodology for charging an AUV battery pack in situ in support of long term deployments at remote sites 相似文献
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