Stabilizer for Reducing Motion of an Object Disposed in a Fluid.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A stabilizer or drogue, packageable in a minimal volume, which can be automatically deployed to dampen horizontal, vertical and rotational motion of a device, such as a hydrophone, operating in a relatively viscous fluid. The stabilizer is disposed on a line or cable connected between the device and a surface float, and includes a horizontally oriented fabric fin extended and supported by a plurality of rigid arms, and a plurality of vertically oriented perpendicular fabric fins connected to, extend and supported by the arms and by a rigid vertical tube slidably disposed on the line. The arms are adjacently pivotably connected to a rigid body loaded by the device. Before deployment, the fabric is wrapped around the tube, and the arms are in a raised position substantially adjacent and parallel to the line and the tube, all stowed within a cylindrical container having an open end. The closed end of the container is fixedly connected to the line. The weight of the device acting against the body causes withdrawal of the stabilizer from the open end of the container. Tension on the cable applied by the buoyancy of the float and the weight of the device forces a locking plug, connected to the line, up against the ends of the arms adjacent the line, forcing the arms to pivot 90 degrees away from the line perpendicular with respect to each other to extend the fabric and thereby deploy the stabilizer. Author
- Marine Engineering
- Acoustic Detection and Detectors
- Fluid Mechanics