Measurement of Pressures and Hydrodynamic Forces on a Shiplike Model Oscillating in a Free Surface

摘要

A shiplike model was forced to oscillate in heave in still water to investigate the distribution of pressures, heaving forces, added-mass and damping coefficients along the length of the model. The heaving forces and phase angles measured at several sections are compared with values for corresponding two-dimensional cylinders of shiplike cross-sections calculated theoretically and experimentally confirmed. Results obtained from 3-dimensional theory and strip calculation are also provided for comparison. The total force, added-mass and damping coefficients are obtained in two ways: first, by direct force measurement and then, by integrating the vertical components of pressures over the wetted surface of the model. Reasonable agreement has been found between these two different approaches. (Author)