Ship Nonlinear Rolling and Roll Angle Reconstruction Based on FIR


The paper analyzes the nonlinear damping torque and nonlinear restoring moment and establishes the nonlinear motion equation of ship rolling under random sea. The Runge-Kutta method is used in the time domain to solve the equation, and to simulate the time history of random wave excitation ship rolling and free decay process. This paper used the ship attitude inertial measurement system and its algorithm technology to construct the ship rolling angle from the acceleration measuring signals and to simulate the angle acceleration measurement signal. To study on test conditions of these parameters and the method to improve the accuracy of parameters, the effect of acceleration measurement noise on angle reconstruction accuracy is studied. Under SNR 20, reconstructed angle RMSE is 0.0019 rad. Studies show that the inertial measurement system and algorithm can effectively reconstruct ship rolling angle from the acceleration measurement signal, and the algorithm has the ability to suppress measurement noise.

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Lu, J. , Zhang, C. , Chen, S. and Wu, Y. (2015) Ship Nonlinear Rolling and Roll Angle Reconstruction Based on FIR. Open Access Library Journal, 2, 1-10. doi: 10.4236/oalib.1102171.

Conflicts of Interest

The authors declare no conflicts of interest.


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