大振幅PMM試験による船体操縦流体力微係数について

抄録

　Ship maneuverability is a crucial aspect of safety, requiring thorough evaluation before construction. The Maneuvering Modeling Group (MMG) model offers a simulation-based approach to estimate this performance. Hydrodynamic derivatives play a pivotal role in the MMG model. To acquire these parameters, towing tank tests are essential, and two common methods are the Oblique Towing Test (OTT) / Circular Motion Test (CMT) and the Planar Motion Mechanism (PMM) test. The PMM test allows for acquiring hydrodynamic derivatives with fewer tests than OTT/CMT. The results of the PMM test are influenced by the motion frequency given in the tests, and test conditions must be carefully considered. While it is known keeping the frequency sufficiently low in PMM test reduces frequency effects on hydrodynamic derivatives, the relationship between coefficients obtained through PMM and OTT/CMT has not been thoroughly explored.

　In this paper, the relationship between the results of the low-frequency PMM tests and OTT/CMT has been investigated. Consequently, this study identifies that the hydrodynamic derivatives obtained from low-frequency PMM tests are equivalent to those obtained from OTT/CMT.