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Publications
Xu, H.T., Pires da Silva, P. and Guedes Soares, C. (2024), Effect of the sampling rate of sea trial tests on the estimation of hydrodynamic parameters for a nonlinear ship manoeuvring model, Journal of Marine Science and Engineering, Vol. 12, 407
This paper investigates the effect of the sampling rates during sea trials on the hydrodynamic parameter estimation of a nonlinear manoeuvring model. The sea trials were carried out on an offshore patrol vessel and test data was collected. To describe the manoeuvring motion of the ship, a nonlinear manoeuvring model is proposed and the truncated least square support vector machine is used to estimate the nondimensional hydrodynamic coefficients and the corresponding uncertainty using the 25 °-25 ° zigzag test. To investigate the effect of the sampling rates, the training set is resampled offline with 14 sampling rates, ranging from 0.2Hz to 5Hz, where the sampling rate 10 times the highest frequency component of the signal of interest, is also included in this range. The results show that the higher sampling rate can significantly diminish the parameter uncertainty. To obtain a robust estimation of linear and nonlinear hydrodynamic coefficients, the sampling rate should be higher than 10 times highest frequency component of the signal of interest, and 3Hz-5Hz is recommended for the case in this paper. The validation is also carried out, which indicates that the proposed truncated least square support vector machine can provide a robust parameter estimation.
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