Feasibility of Wave Measurement by Using a Sailing Buoy and the Artificial Neural Network Technique

doi:10.16183/j.cnki.jsjtu.2021.094

Abstract

Abstract:

Ocean waves have adverse effects on the operation and safety of ships. Real-time and accurate onboard wave monitoring is essential for green smart ships and navigational safety. It is an important method to use ship motion to perform inversion of the information of encountering waves, which has many advantages such as low cost and high spatio-temporal resolution, and has attracted wide attention. An inversion model based on artificial neural network (ANN) is proposed to deal with the shortcomings of existing ship motion inversion ocean wave models. Taking the motion time history of the ship as the input and the wave elevation time history as the output, the artificial neural network is used to extract the motion features of the ship, and the linear function is input to perform wave surface time history inversion. To verify the feasibility and the accuracy of the inversion model, a ship model tank test is conducted. The results show that the proposed wave measurement method based on the artificial neural network can well achieve regular wave and irregular wave elevation time history inversion. Most of the statistical errors of regular wave inversion are less than 10% and the error of irregular wave inversion is about 10%. The method proposed provides an effective and feasible means for inversion of wave time information in ship motion.

Key words: wave inversion, artificial neural network, sailing wave buoy, tank testing

CLC Number:

U268.6

QIN Yichao, HUANG Limin, WANG Xiao, MA Xuewen, DUAN Wenyang, HAO Wei. Feasibility of Wave Measurement by Using a Sailing Buoy and the Artificial Neural Network Technique[J]. Journal of Shanghai Jiao Tong University, 2022, 56(4): 498-505.

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参数	数值
船长/m	1.03
设计水线宽/mm	290.1
设计吃水/mm	300
排水量/kg	19.44
湿表面积/mm²	74571
方形系数	0.21
棱形系数	0.583
浮心纵向坐标/mm	51.06
船舶重心距离基线垂向高度/mm	210.4

指标	数值
长/m	108
宽/m	7
深/m	3.5
造波周期/s	0.4~4
规则波波高最大值/m	0.4
不规则波有义波高最大值/m	0.32

编号	波长船长比	波长/m	频率/ (rad·s^-1)	周期/s	波高/m	编号	波长船长比	波长/m	频率/ (rad·s^-1)	周期/s	波高/m
1	1.1	1.133	7.376	0.852	0.0227	7	2.0	2.060	5.470	1.149	0.0412
2	1.4	1.442	6.538	0.961	0.0288	8	2.1	2.163	5.338	1.177	0.0433
3	1.6	1.648	6.116	1.027	0.0330	9	2.2	2.266	5.215	1.205	0.0453
4	1.7	1.751	5.933	1.059	0.0350	10	2.5	2.575	4.893	1.284	0.0515
5	1.8	1.854	5.766	1.090	0.0371	11	3.0	3.090	4.466	1.407	0.0309
6	1.9	1.957	5.612	1.120	0.0391	12	3.5	3.605	4.135	1.520	0.0600

ω/(rad·s^-1)	RMSE/mm	e_r/%
7.372	2.629	11.60
6.535	1.501	5.21
6.113	1.486	4.51
5.930	1.277	3.65
5.763	2.740	7.39
5.609	3.001	7.67
5.467	6.717	10.34
5.335	4.117	9.52
5.213	3.182	7.02
4.890	2.228	5.39
4.464	5.552	3.60
4.133	3.592	2.99