.... In order to deal with this problem, we developed a heading control system for turret moored FSRU and conducted a series of model tests with three azimuth thrusters on aft part of the vessel. A Kalman filtering technique is applied to estimate the low frequency motion of vessel. RMAC algorithm is employed...

.... While both wave-frequency and low-frequency motions contribute fatigue damage at the connections, the low-frequency damages are traditionally neglected. This paper presents the results of a detail analysis to clarify how much fatigue damage low-frequency motions contribute. For comparison, the paper...

... on the Statistical Characteristics of Low-Frequency Motions of a Floating Offshore Structure S. Miyajima and H. Maeda Institute of Industrial Science, University of Tokyo Tokyo, Japan HyoJae Jo Dept. of Naval Architecture, Pusan National University Pusan, Korea ABSTRACT It is very important to estimate exactly low...

... the low frequency motions and is to a large extent attributed to uncertainties. In damping models, and In extreme response distribution models. This paper describes results from an experimental and theoretical study of a turret moored vessel. To obtain reliable estimates of extreme motions, long time...

... drift forces. the moored vessel performs low-frequency motions of velocity that have influence on drift force. This velocity also affects the slowly-varying drift forces. The joint action of the sea current and the slow motions on the wave drift force is considered in the form of linear coefficients...

...-FREQUENCY MOTIONS OF MOORED FLOATING STRUCTURES H. Maeda, H Jo and S. Miyajima Institute of Industrial Science, University of Tokyo Tokyo,Japan ABSTRACT It is very important to consider low frequency motions, in designing moored systems for a floating structure. Many investigations have been studied...

... and experimental results. INTRODUCTION Low-frequency and large-amplitude horizontal motions of moored floating structures are induced at resonant frequencies of the mooring system by low frequency second-order wave drift forces. To predict the low-frequency motion the low-frequency damping forces should...

... wind force investigation theoretical model surge wave drift force coefficient mean force wind feed forward support vessel heave procedure spectra drag force uncle john upstream oil & gas low-frequency motion prediction full-scale measurement Proceedings of the First (199l...

... and of low-frequency motions (second- order) from wave- drift forces. The amplitudes of low-frequency motions are influenced by the mooring positioning system.In this paper, the influence of some parameters, such as preten- sion, unit weight, number of chains in the system and water depth on ship motions has...