Metcalfe, A.Maurits, L.Svenson, T.Thach, R.Hearn, G.2010-11-182010-11-182005Australia and New Zealand Industrial and Applied Mathematics (ANZIAM) Journal, 2005; 47:C915-C9331446-1811http://hdl.handle.net/2440/61876Data from sea keeping trials of a Scottish trawler are analyzed. The trawler sailed an octagonal course, each leg took over 20 minutes and data recorded twice a second. The natural frequencies of vibration for each of the six rigid body modes are estimated from the heave, surge, sway, pitch, yaw and roll time series. The time series are investigated for evidence of non-linearity. A time domain model is fitted to a roll time series, and second order amplitude response functions are then obtained using autoregressive estimators.enCopyright (c) Australian Mathematical SocietyJournal article003000107065076Metcalfe, A. [0000-0002-7680-3577]