为分析半滑行航态下(1.0In order to study the influence of trimaran side hulls layout on added mass and maneuverability in semi-planing state (1.0< Fr▽ <3.0), the model of the trimaran with different side hull layout was established by using wigley ship as parent ship. In consideration of the variation of heave, pitch and displacement in semi-planing state, the added mass hydrodynamic coefficient of six-degree trimaran was calculated based on 3-d potential flow theory by using the panel method. Results show that the wetted surface and volume change of drainage resulted from heaving and pitch have a greater influence on added mass of surge, sway and yaw, which is related to the maneuverability in the horizontal plane of trimaran. Compared with the upright state, the average increase was 41.37%,21.74% and 21.49% respectively. The impact of different side hull transverse positions on the added mass is relatively smaller under a certain longitudinal side hull layout. In the case of a certain transverse side hull layout, the trimaran has a relatively larger added mass of yaw while the side hull is disposed in rear of the hull, which contributes to the stability of the ship course. When the side hull is disposed beside the amidship, the trimaran has a relatively smaller added mass of yaw, which contributes to the course-changing performance. When the side hull is placed in the front, the yaw added mass and the course-changing ability are between above two layout.
