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1、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
2、 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，
3、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 pocketingB. KG is reduced as the vessel seeks the angle of lollC. effective beam is increased causing BM to in
4、crease 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 increased2. 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 characteristicsC. excessiv
5、e pitch or roll D. negative initial stability3. 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. vertical4. A floating MODU with an initial negative metacentric height _.A. will cap
6、size B. will incline furtherC. may lie at an angle of loll D. may be initially level5. When a floating MODU inclines to an angle slightly greater than the angle of loll, she will _.A. capsize B. incline furtherC. flop to the other side D. return to the angle of loll6. When a floating MODU inclines t
7、o an angle slightly less than the angle of loll, she will _.A. capsize B. incline lessC. flop to the other side D. return to the angle of loll7. At an angle of loll, the capsizing moment is _. capsizing moment倾覆力矩A. maximum B. negative C. positive D. zero8. At an angle of loll, the righting arm (GZ)
8、 is _.A. maximum B. negative C. positive, but reflexive D. zeroLiftboat 多功能工程船A liftboat is a self-propelled, self-elevating vessel with a relatively large open deck capable of carrying equipment and supplies in support of various offshore mineral exploration and production or offshore construction
9、activities. A liftboat also has the capability of rapidly raising its hull clear of the water on its own legs so as to provide a stable platform from which maintenance and construction work may be conducted.【美国原题】1. You are operating a liftboat. Before starting jacking operations you should _.A. put
10、 the crane in a vertical positionB. close the wheelhouse doorsC. have all personnel don life jackets 叫所有人员穿救生衣D. put a watch in the engineroom2. A flooded leg on a liftboat would adversely affect the vessels stability underway by _.A. increasing the righting momentB. decreasing the vessels displacem
11、entC. increasing the reserve buoyancyD. shifting the CG (center of gravity) off center3. You are operating a liftboat. When beginning to jack down you should _.A. jack down one leg at a timeB. jack up first, then down 先顶起再往下压C. undog doors to the engine roomD. assemble all personnel on the main deck
12、4. After jacking down your liftboat you have an unexpected list. You find that the only cause of this list must be a flooded leg. Your next course of action should be to _.A. jack the vessel back up to a safe height 将船舶顶回到一个安全的高度B. proceed on to your next destination since the list is unimportantC.
13、pump out all ballast to gain reserve buoyancyD. notify the U.S. Coast Guard5. After jacking down your liftboat you have an unexpected list. You find that the only cause of this list must be a flooded leg. The list caused by a flooded leg means your vessel has a(n) _.A. negative GM (metacentric heigh
14、t)B. decrease in the GZ (righting arm)C. increase in the waterplane and the metacentric heightD. less chance of deck edge immersion6. You are operating a liftboat. When jacking down and free of the bottom you should _.A. raise one leg at a time B. not be concerned about any listC. raise all legs sim
15、ultaneously D. have the crane standing upright7. You are operating a liftboat. When jacking down and a leg becomes stuck on the bottom, you should _.A. raise the free legs all the wayB. use the engines to rotate about the leg that is stuckC. jack the barge down part way to pull the leg freeD. submerge the barge completely to give added pull8. After jacking down your liftboat you have an unexpected list. You find that the only cause of this list must be a flooded leg. Raising the flooded leg further would adversely affect the boats stability by _.A. raising the KG and increas
