Method and apparatus for controlling the motion of an autonomous moored profiler
First Claim
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1. An autonomous moored profiler for profiling a volume of fluid, comprising:
- one or more buoyant members for buoying the profiler in the fluid;
a winch, said winch including a spool, a device providing for controlled rates of turning of said spool, and a flexible cable for winding onto and unwinding from said spool, a first end of said cable being carried by the profiler; and
a controller for controlling said device so as to vary said rate in response to changes in the tension in said cable, for maintaining the tension in the cable substantially constant within the capabilities of the controller.
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Abstract
A method and apparatus for controlling the motion of a cable-driven autonomous moored profiler. The profiler includes one or more buoyant members for buoying the profiler in the fluid, a winch, and a feedback controller for controlling the winch. The winch includes a spool, a device providing for varying rates of turning of the spool, and a flexible cable for winding onto and unwinding from the spool. A first end of the cable is carried by the profiler. The controller monitors an indication of the tension in the cable and controls the device in response thereto.
19 Citations
21 Claims
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1. An autonomous moored profiler for profiling a volume of fluid, comprising:
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one or more buoyant members for buoying the profiler in the fluid; a winch, said winch including a spool, a device providing for controlled rates of turning of said spool, and a flexible cable for winding onto and unwinding from said spool, a first end of said cable being carried by the profiler; and a controller for controlling said device so as to vary said rate in response to changes in the tension in said cable, for maintaining the tension in the cable substantially constant within the capabilities of the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for autonomously profiling a body of fluid, comprising the steps of:
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providing a buoyant platform submerged in the fluid and carrying one or more measuring instruments for measuring one or more selected characteristics of the fluid; pulling on the platform by pulling on a flexible cable attached thereto, so as to either (a) cause the platform to descend through the fluid, or (b) resist ascension of the platform through the fluid caused by the platform'"'"'s buoyancy; monitoring an indication of the tension in the cable in the course of said descent or ascension; and automatically varying the rate of said pulling in response to changes in the tension in the cable determined by said step of monitoring, for improving the platform'"'"'s resistance to changes in the rate of descent or ascension in response to varying pressure fields in the fluid. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification