Applications of a Motion Compensation Stabilized Vertical Array of Hydrophones

Collins, Michael D.

doi:10.1109/access.2019.2922535

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…The PLC collects the heave signal of working platform through the displacement sensor. According to the signal, the proportional directional valve is controlled to change the direction [10]. When the platform moves upward, the proportional directional valve is controlled to move by the PLC, the piston of the active compensation cylinder is moved downward and the crane is driven to move downward to compensate the heave motion of the platform.…”

Section: System Structure Designmentioning

confidence: 99%

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Active-Passive Combined Control System in Crane Type for Heave Compensation

et al. 2019

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For the purpose of researching the displacement control system of heave compensation for offshore drilling platform, a set of crane type active and passive combined heave compensation device are designed on the basis of the similarity principle. As it known that platform heaving will be caused by the wind, sea wave and ocean current when conducting the drilling operations on the offshore drilling platform, which then will disturb the drilling operation. Therefore, the compensation device must be adopted to keep the vertical relative motion between the drill string system and the drilling platform to zero during the operation. Meanwhile, to improve the real-time performance of the heave compensation, the control system is optimized by establishing the simulation model of the active-passive combined crane, and LS-SVM(Least Squares Support Vector Machine) is improved by the artificial immune algorithm to predict the motion trend of offshore platforms. Eventually, in order to acquire the best control scheme, the Proportion Integration Differentiation (PID), fuzzy PID, BP neural network PID control method are utilized to carry out the simulation analysis, and the BP neural network PID control is found to be the optimum. Experiments showed that after using the BP neural network PID control algorithm, the displacement compensation rate of hook for active-passive combined crane device is more than 90%, the performance of the heave compensation is better, and the control is in time. INDEX TERMS Heave compensation, least squares support vector machine, BP neural network, PID control. FIGURE 1. Schematic diagram of crane type active-passive combined heave compensation device.

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Section: System Structure Designmentioning

confidence: 99%

“…According to the load pressure-flow characteristics of the solenoid proportional directional valve [10]:…”

Section: A Hydraulic Cylinder Modelingmentioning

confidence: 99%

Active-Passive Combined Control System in Crane Type for Heave Compensation

et al. 2019

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Localizing Submerged Acoustic Sources Under Adverse Conditions

Collins

Fialkowski

Lingevitch

2022

J. Theor. Comp. Acout.

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This paper reviews various approaches for localizing submerged acoustic sources under adverse conditions. It is essential to obtain data of the highest possible quality when there are adverse conditions, such as uncertainties in the environment, source motion, and low signal-to-noise ratio. Focalization is an approach in which the source location and environmental parameters are treated as unknowns. Due to a parameter hierarchy in which source location outranks environmental parameters, there may be many realizations of the environment that bring the source into focus; the ambiguity in the environment can be an advantage if the primary objective is to localize the source. Environmental uncertainty is often associated with environmental complexity, which can be an advantage by reducing the ambiguity of the source location. Obtaining a high-quality estimate of the covariance matrix may be difficult when there is source motion, but the complexity of the received field from a moving source is another factor that can reduce ambiguity. It may be possible to localize a source that is buried in noise when an estimate of the noise covariance matrix is available. During the development of approaches for localizing submerged sources, much of the focus has been on one-dimensional vertical arrays. An extension of the multi-valued Bartlett processor to the case of a rectangular array was designed to take advantage of the extra dimension of the array and appears to have the potential to be the most powerful combination of hardware and signal processing to date.

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Selected Topics of the Past Thirty Years in Ocean Acoustics

Collins¹,

Turgut²,

Buckingham³

et al. 2022

J. Theor. Comp. Acout.

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This paper reviews some of the highlights of selected topics in ocean acoustics during the thirty years that have passed since the founding of the Journal of Theoretical and Computational Acoustics. Advances in computational methods and computers helped to make computational ocean acoustics a vibrant area of research during that period. The parabolic equation method provides an unrivaled combination of accuracy and efficiency for propagation problems in which the bathymetry, sound speed, and other environmental parameters vary in the horizontal directions. The extension of this approach to cases involving layers that support shear waves has been an active area of research throughout the thirty year period. Interest in basin-scale and global-scale propagation was stimulated by the Heard Island Feasibility Test for monitoring climate change in terms of changes in travel time that occur as the temperature of the ocean rises. Diminishing ice cover in the Arctic, which is one of the consequences of climate change, has stimulated renewed interest in Arctic acoustics during the past decade. Reverberation is a challenging problem that was the topic of a major research program during the beginning of the thirty year period. An innovative approach for making it feasible to solve such problems was applied to data for reverberation from the seafloor and from schools of fish, and some of the findings were featured in Science and Nature. Source localization is one of the core problems in ocean acoustics. When applied on a 2-D array of receivers, an approach based on the eigenvectors of the covariance matrix is capable of separating the signals from different sources from each other, determining when this partitioning step is successful, and tracking sources that cross each other in bearing; one of the advantages of this approach is that it does not require environmental information or solutions of the wave equation. Geoacoustic inversion for estimating the layer structure, wave speeds, density, and other parameters of ocean bottoms has also been a topic of interest throughout the thirty year period.

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Applications of a Motion Compensation Stabilized Vertical Array of Hydrophones

Cited by 5 publications

References 19 publications

Active-Passive Combined Control System in Crane Type for Heave Compensation

Active-Passive Combined Control System in Crane Type for Heave Compensation

Localizing Submerged Acoustic Sources Under Adverse Conditions

Selected Topics of the Past Thirty Years in Ocean Acoustics

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