A Study on Practical PMM Test Technique for Ship Maneuverability Using System Identification Method

J. Ocean Eng. Technol. 2002;16(6):25-31.

선박의 조종성능 추정에 있어서 시스템식별법을 이용한 PMM 시험 기법에 대한 연구

이태일,권순홍

현대중공업 선박해양연구소,부산대학교 조선·해양공학과

Keywords: Ship Maneuverability, PMM Test, Hydrodynamic Coefficients, System Identification, Fourier Integration Method, Least Square Method

핵심용어: 선박조종성, 평면운동시험, 유체력미계수, 시스템식별법, 퓨리에 적분법, 최소자승법

Abstract

A system identification method is introduced to increase the prediction accuracy of a ship's maneuverability in PMM test, analysis. To improve the accuracy of linear hydrodynamic coefficients, the analysis techniques of pure sway and yaw tests are developed, and confirmed. In the analysis of sway tests, accuracy to linear hydrodynamic coefficients depends on the frequency of sway motion. To obtain nonlinear hydrodynamic coefficients for large drift angles, a combined yaw test is introduced. Using this system identification method, runs of PMM test can be reduced while retaining sufficient accuracy, compared to the Fourier integration method. Through the comparisons with sea trial results and the Fourier integration method, the accuracy and efficiency of the newly proposed system identification method, based on least square method, has been validated.