Control means for motion compensation devices
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United States of America Patent
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-
Sep 14, 1982
Grant Date -
N/A
app pub date -
May 9, 1980
filing date -
Jun 19, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system for stabilizing a body suspended by a flexible line from a structure such as a ship, which is subject to uncontrolled oscillating movements, such as may be caused by wave motion, incorporates a winch (3) to which the line is attached, a pulley (4) over which the line (2) passes and from which the body is suspended, and a loop in the line between the winch and pulley, an accelerometer (28) being located adjacent the pulley, and the length of the loop being altered in controlled response to a stabilizing signal formed by combining signals derived from the accelerometer, and from the measured amplitude of oscillations of the loop length, and modified by a compensating signal to compensate for the effect of friction in the system.
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