Estimation of wave-induced ship hull bending moment from ship motion measurements

Xu, Jinsong (2000) Estimation of wave-induced ship hull bending moment from ship motion measurements. Doctoral (PhD) thesis, Memorial University of Newfoundland.

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Abstract

A time-domain technique is developed for the real-time estimation of wave-induced vertical bending moment from the coupled heave and pitch motion measurements. The estimated values can be compared with those obtained from the strain gauge readings to ensure the validity of Hull Response Monitoring Systems (HRMS). -- A general time-domain relationship between the vertical bending moment and the coupled heave and pitch motions was formulated through a Fourier transform of the frequency-domain mathematical model. The instantaneous bending moment value was approximated by a function of the heaving and pitching displacements, velocities, and accelerations. A neural network technique was developed to identify this unknown function through a learning process. -- The application of the proposed technique to the experimental data demonstrated the validity of the methodology. The simulation results suggested that this technique could be used in conjunction with a time-domain simulation package to provide a numerical estimation model.

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