SEAMAN Simulations

SEAMAN Simulations

All simulation work done by SSPA is using the SEAMAN software as simulation core. SEAMAN is fully owned and developed by SSPA. SEAMAN is a software used for dynamic simulation of ship motions in 4 or 6 degrees of freedom in the time domain or for quasi-static simulations in up to 4 degrees of freedom.

Both seakeeping and manoeuvring performance can be studied including effects of wind (incl. gust), waves (both 1st and 2nd order), current, shallow waters, canals, squat, banks, ship interaction, misc. equipment such as high efficiency rudders, bow thrusters, azimuth propulsion, moorings, anchors, etc. 

The basic calm water manoeuvring simulation model is described by Norrbin (1970) and later developments by Ottosson and Byström (1991) and Ottosson (1994). The wind loads are based on systematic wind tunnel tests as presented by Isherwood (1973), while the wind gust model is based on Davenport (1978). The wave loads are based on publications by Kaplan and Raff (1972), Faltinsen and Loken (1978) and Gerritsma and Beukelman (1971). Bank effects are accounted for in SEAMAN by use of a semi-empirical model based on model tests performed at SSPAs facilities and regression analysis and presented in Da-Qing (2000). 

Shallow water effects on manoeuvring including squat is based on work by Norrbin (1970) and regression analysis performed on model tests results within the SWABE Joint Industry Project (Shallow Water and Bank Effects), performed at SSPAs facilities. In general, the results from the JIP are confidential but a small portion is presented in Allenström et al. (2009). Participants in the JIP were, among others, the following Korean shipyards; DAEWOO SHIPBUILDING & MARINE ENGINEERING CO., LTD, Hanjin Heavy Industries & Construction Co., Ltd., HYUNDAI HEAVY INDUSTRIES CO., LTD, SAMSUNG HEAVY INDUSTRIES CO., LTD. and STX Offshore & Shipbuilding Co., Ltd.

The SEAMAN software is designed in order to provide for great flexibility working with the simulation model. That allows for quick adaption to conclusions and decision made during a simulation session. SEAMAN is continuously developed and verified based on results and experiences from model tests and simulation studies carried out at SSPA.


The scope of use of the SEAMAN software