When sailing in waves , a part of ship bow will depart from water surface because of the significant heave and pitch ( mostly happened at bow in head seas , and may happened at stern in follow sea ) . when ship enter into water once again , violent impact with waves will happen , which is called slamming 当船舶在波浪中航行时,由于剧烈的垂荡和纵摇,船底的一部分会露出水面(主要是在迎浪时发生在船体前部,但在低速随浪时也可能发生在船体后部) 。
The results are of more precision by adopting the latest achievements . conclusions are drawn by a large number calculation . 1 . to large extent , the magnitudes of sway and yaw are affected by the depth of water , so is that of anchor chain tension ; the magnitudes of sway and yaw are smaller in the shallows than in the deep , so is that of anchor chain tension ; 2 . to small extent , the magnitude of heave and pitch is affected by the depth of water 该数学模型突破了以往数学模型的局限性,不仅考虑了纵荡、横荡、首摇运动,还考虑了垂荡、纵摇运动;在该数学模型中还考虑了浅水的影响,对模型中受浅水影响较大的部分作了浅水修正;在计算各外力时,采用最新研究成果,使计算结果更加准确;通过大量计算得出一些很有意义的结论: 1