Method and apparatus for active heave compensation
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United States of America Patent
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Sep 11, 2012
Grant Date -
Mar 4, 2010
app pub date -
Dec 6, 2006
filing date -
Dec 6, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and apparatuses for active heave compensation, the method, in certain aspects, including the steps of: (a) measuring with a measurement device (44) the heave of a vessel (10) and outputting a heave signal representative thereof; (b) using said heave signal to compensate for said heave by moving a connection device (20) relative to said vessel (10) as a function of said heave signal, whereby movement due to said heave of a load attached to said vessel via the connection device is reduced; said heave signal comprising errors induced by said measurement device (44) whereby accuracy of said compensation is reduced; (c) processing said heave signal so as to reduce said errors and outputting an adjusted heave signal; and (d) using said adjusted heave signal to move said connection device (20) to compensate for said heave.
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