| 摘要 |
A wave motion compensator for a marine winch, in which the tension on the winch rope is maintained substantially constant while the load on the rope moves relative to the winch. This constant tension is maintained by controlling the winch drive motor so that the movement of the winch rope matches the movement of the load without substantial lag. The control is provided by a computer which repeatedly monitors the movement of the winch rope and, by comparing this input data and standard sea state data, predicts the relative movement of the load and the winch at a time in advance of the time the prediction is made at least as long as the lag time of the winch system. The computer then issues appropriate commands to the winch drive motor controller. In marine applications involving the lifting or lowering of loads, the computer is also used to determine the optimum time for initiating lifting and completing lowering of the load, and to automatically perform these operations.
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