... the quadratic differential equation under harmonic excitation, called frequency domain method. It is simple and fast process, which can give a solution for steady state problem. However, due to the torsional impact causes by propeller and ice is non periodic, it should be solved by time domain method, unless...

... ABSTRACT This paper presents the analysis of the modal frequencies and mode shapes of the Vestas four-rotor wind turbine using two operational modal analysis methods. The Frequency Domain Decomposition method is used for standstill analysis, and the Ibrahim Time Domain method is used...

... calculation frequency domain frequency motion upstream oil & gas air gap time domain simulation time domain method stiffness subsea system minimum air gap amplification factor domain method mooring system approximation low frequency motion air gap calculation surface...

... together with the motions. In order to analyze the mooring line force of this device when in survival condition, two ways are used. One way is using frequency domain method to solve the higher order hydrodynamics and the mooring forces. The other is the time domain analysis method, in which the impulse...

... analysis in the time domain is accurate and reliable, yet it is exceedingly time consuming for at least two reasons. subsea system wf cycle frequency fatigue damage domain method statistics fatigue analysis hybrid method normalized fatigue damage line tension wf tension lf tension...

... agreement has been found between the present result and the result from a frequency-domain method. INTRODUCTION With the development of ocean engineering, the study of nonlinear wave diftraction and radiation has become more and more important, with practical applications relating to load and response...