Research on the indirect monitoring method of wave bending/torque for large-opening ships

Abstract

In this paper, the indirect monitoring method of wave bending/torque is studied based on hull torsion theory to accurately obtain the wave bending/torque monitoring of large-opening ships. According to the relationship between the bending/torque of the mid-ship cross section and the longitudinal strain of the hull structure, a combined double-section monitoring method is proposed, and a mathematical model of indirect monitoring of wave bending/torque is established numerically. The accuracy of identified wave bending/torque is verified through several numerical simulations. In the combined double-section monitoring method developed in this study, two adjacent cross sections of the hull structure are monitored simultaneously. The bi-moment, bending moment, and torque moment of the free torsion of each hull structure monitoring cross section are calculated to obtain the wave bending/torque of the middle section. The numerical simulations demonstrate that the combined double-section monitoring method can accurately provide wave bending/torque, particularly the calculation accuracy is higher as the wave height is higher.