It was only when the hull was hanging freely from the lifting frame, clear of the seabed and the suctioneffect of the surrounding mud, that the salvage operation progressed to the second stage.
只有当船体从升降架上自由悬挂，脱离海床和周围泥浆的吸力作用时，打捞工作才进入第二阶段。
2
The suctioneffect on separation and lift force are studied by numerical method.
本文使用数值模拟方法研究了吸气效应对分离的控制及增升作用。
3
It can improve gas suctioneffect, reduce drilling hole amount and save construction investment.