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http://dx.doi.org/10.3744/SNAK.2010.47.2.141

Development of Algorithm for Measuring Oscillating Angles and Periods of Ships in a Seaway  

Choi, Kwang-Sik (Korea Aerospace Research institute)
Won, Moon-Cheol (Dept. of Mechatronics, Chungnam National Univ.)
Ryu, Sang-Hyun (Dept. of Mechatronics, Chungnam National Univ.)
Lew, Jae-Moon (Dept. of NAOE, Chungnam National Univ.)
Ji, Yong-Jin (Super Century Co., Ltd.)
Publication Information
Journal of the Society of Naval Architects of Korea / v.47, no.2, 2010 , pp. 141-149 More about this Journal
Abstract
It is essential to find oscillating angles and periods in a seaway when designing and manufacturing stabilizers. It is difficult to find oscillating angles and periods in high speed turning and they vary with ship speed and wave heading angles, therefore, proper algorithm to measure oscillating periods in a seaway. In the present study, three kinds of algorithms are developed to measure oscillating angles periods in a seaway. Dual axis tilt sensor of low price is used to measure oscillating angles, and the effect of lateral accelerations on tilt sensor have been reduced by the fusion algorithm using the gyro sensor signals. Analog and digital filters are applied to minimize the noise of the signals. Three kinds of algorithms, zero crossing, peak to peak and moving zero crossing algorithm, are developed to measure oscillating periods in a seaway. It is found that the moving zero algorithm showed the best results in the sea trials.
Keywords
Tilt, Gyro sensor; Digital filter; Zero crossing; Peak to peak; Moving zero crossing;
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Times Cited By KSCI : 1  (Citation Analysis)
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