Angle of loll 负稳性初倾角，负稳性横倾角，失稳横倾角 A ship having a very small negative initial metacentric height GM need not necessarily capsize. This situation produces an angle of loll. 初稳性高度为一个非常小的负值的船舶不一定倾覆。这种情况产生负稳性横倾角。 As the angle of heel increases, the centre of buoyancy will move out still further to the low side. If the centre of buoyancy moves out to a position vertically under G, the capsizing moment will have disappeared. The angle of heel at which this occurs is called the angle of loll. It will be noticed that at the angle of loll, the GZ is zero. 随着横倾角增大，浮心将缓慢向外移，进一步移到较低的一舷。如果浮心向外移至船舶重心的正下方某一位置，倾覆力矩将会已经消失。这时的横倾角称为负稳性横倾角。将会注意到在负稳性横倾角处静稳性力臂为0。 【美国原题】 1. An upright vessel has negative GM. GM becomes positive at the angle of loll because the ______. A. free surface effects are reduced due to pocketing B. KG is reduced as the vessel seeks the angle of loll C. effective beam is increased causing BM to increase 有效船宽增大导致 BM 增大 [GM=KB+BM-KG，如果(KB-KG)不变而 BM 增大，从而导致 GM 增大并转为正值]。 D. underwater volume of the hull is increased 2. The angle of loll is a stability term which applies to a floating MODU with ______. MODU: mobile offshore drilling unit 移动式近海钻井平台 A. off-center loading B. stiff characteristics C. excessive pitch or roll D. negative initial stability 3. A MODU is inclined at an angle of loll. In the absence of external forces, the righting arm (GZ) is ______. righting arm (GZ)复原力臂，也称为静稳性力臂 A. positive B. negative C. zero D. vertical 4. A floating MODU with an initial negative metacentric height ______. A. will capsize B. w...
