The air cushion vehicle (ACV) sea keeping characteristic under different wave directions with the operation resistance is discussed with the couples of the heave, pitch roll motion and the pressure of the cushion. In ...The air cushion vehicle (ACV) sea keeping characteristic under different wave directions with the operation resistance is discussed with the couples of the heave, pitch roll motion and the pressure of the cushion. In previous researches, only wave and cross wave direction were discussed. Then a Matlab program is made to calculate the united frequency responses of heave, pitch and roll amplitude of the craft, under different wave frequencies and different wave directions. The results of the research depict some dangerous situations under which the sympathetic vibration happens in heave, pitch and roll motion and the amplitudes are extremely higher than those under the ordinary conditions. These results will be helpful in ACV design and operation.展开更多
THE high seas around the Horn of Africa have again entered the headlines. After a relatively quiet five-year period since pirates caused havoc to passing vessels - they are back. On April 8, China＇s navy reported th...THE high seas around the Horn of Africa have again entered the headlines. After a relatively quiet five-year period since pirates caused havoc to passing vessels - they are back. On April 8, China＇s navy reported the attempted hijacking of a ship from Tuvalu （South Pacific independent island nation） by suspected Somali pirates. Working together with the Indian navy, they managed to secure both the ship and the safety of the crew,展开更多
In order to predict the speed loss in the actual sea states more precisely, delivered power shall be measured more accurately as an input. Therefore, based on a 50,000 DWT tanker, various results obtained from differe...In order to predict the speed loss in the actual sea states more precisely, delivered power shall be measured more accurately as an input. Therefore, based on a 50,000 DWT tanker, various results obtained from different prediction methods were compared by a series of model tests performed in calm water and in waves. It is shown that speed loss deprived from RTIM （resistance and thrust identity method） method in regular waves test could satisfy the engineering requirements most.展开更多
China takes part in a multinational naval exercise aimed at combating maritime terrorism For the first time, Chinese warships have taken part in a multinational naval exercise hosted by a foreign country, which is ...China takes part in a multinational naval exercise aimed at combating maritime terrorism For the first time, Chinese warships have taken part in a multinational naval exercise hosted by a foreign country, which is aimed at improv-ing the capacity to展开更多
文摘The air cushion vehicle (ACV) sea keeping characteristic under different wave directions with the operation resistance is discussed with the couples of the heave, pitch roll motion and the pressure of the cushion. In previous researches, only wave and cross wave direction were discussed. Then a Matlab program is made to calculate the united frequency responses of heave, pitch and roll amplitude of the craft, under different wave frequencies and different wave directions. The results of the research depict some dangerous situations under which the sympathetic vibration happens in heave, pitch and roll motion and the amplitudes are extremely higher than those under the ordinary conditions. These results will be helpful in ACV design and operation.
文摘THE high seas around the Horn of Africa have again entered the headlines. After a relatively quiet five-year period since pirates caused havoc to passing vessels - they are back. On April 8, China＇s navy reported the attempted hijacking of a ship from Tuvalu （South Pacific independent island nation） by suspected Somali pirates. Working together with the Indian navy, they managed to secure both the ship and the safety of the crew,
文摘In order to predict the speed loss in the actual sea states more precisely, delivered power shall be measured more accurately as an input. Therefore, based on a 50,000 DWT tanker, various results obtained from different prediction methods were compared by a series of model tests performed in calm water and in waves. It is shown that speed loss deprived from RTIM （resistance and thrust identity method） method in regular waves test could satisfy the engineering requirements most.
文摘China takes part in a multinational naval exercise aimed at combating maritime terrorism For the first time, Chinese warships have taken part in a multinational naval exercise hosted by a foreign country, which is aimed at improv-ing the capacity to
