Estimation of Maneuvering Mathematical Model by System Identification Techniques

J. Ocean Eng. Technol. 1999;13(4):118-123.

Lee, Ho-Young;Shin, Hyun-Kyoung;

시스템 검증에 의한 조종수학 모형의 평가

이호영;신현경;

울산대학교 공과대학 수송시스템공학부;울산대학교 공과대학 수송시스템공학부;

Keywords: System Identification, Hydrodynamic Coefficients, Mathematical Model, Maneuvering Motion, Parallel Processing

핵심용어: 시스템 검증, 유체력 미계수, 수학모형, 조종운동, 병렬처리

Abstract

The mathematical model used in the simulation of ship's maneuvering contains the hydrodynamic coefficients, which are usually evaluated based on PMM model tests in the towing tank and used to predict ship's maneuvering performance when applied to the proto-type ship. The proper mathematical model has to be developed to predict ship's maneuvering motions with hydrodynamic coefficients very well. The mathematical model for PMM model tests is analyzed with identification program and the hydrodynamic coefficients and maneuvering motions by system identification we compared with those obtained directly from PMM model tests and sea trial. The mathematical model for PMM model tests was established and the magnitudes of ship's maneuvering coefficients were determined. When the identified values of coefficients were used to simulate the maneuvers, a very good agreement was obtained between the numerically simulated motion responses and those obtained from PMM model tests.