TITLE:
Ship Nonlinear Rolling and Roll Angle Reconstruction Based on FIR
AUTHORS:
Jianhui Lu, Chunlei Zhang, Shaonan Chen, Yunxia Wu
KEYWORDS:
Ship Rolling, Inertial Measurement, Sensitivity Study, Reconstruction Technology
JOURNAL NAME:
Open Access Library Journal,
Vol.2 No.11,
November
23,
2015
ABSTRACT: 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.