Abstract: "Thin hull" model has been used in the theoretical simulation researches of infrared images of objects on the sea up to now and static approximation adopted in the calculation. The physical model is developed for those ships which can mot be treated as thin hull and the temperature field changes with time. The model estabished can inherit the mature algorithms and software of the existing models. Through the extension of the theoretical equations and corresponding software of the thin hull model simulation calculations are made and the effects of body structures of a ship with thick deck on the changing temperature fields of the ship's outside surfaces are studied.

Key words: body effects of thick hull, changing temperature field, thermal images of ships, body effects of thick hull, changing temperature field