Aiming at the problem of multi-degree-of-freedom composite motion compensation of ships under the action of sea waves, a ship motion measurement and compensation algorithm based on a parallel platform to simulate sea waves was proposed,which includes an attitude calculation algorithm and a heave displacement calculation algorithm. First, a ship motion compensation experimental platform composed of two six-degree-of-freedom parallel platforms in series was built. Secondly, based on the inertial measurement unit, a Kalman filter attitude calculation algorithm was used to calculate the roll and pitch attitudes of the simulated ship motion. Thirdly,a heave displacement calculation algorithm was designed, featuring high-pass filtering, phase compensation, and sea wave frequency adaptability. Finally, ship motion compensation experiments were conducted. The experiments results showed that the upper parallel platform can effectively suppress the impact of sea waves on the ship's motion, significantly improving the stability of ship operations. The experiments validated the rationality and effectiveness of the proposed algorithm in this paper, providing an effective method for real ship motion compensation research.
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