船首

• I could hear people tumbling up from the cabin and the foc s le ; and , slipping in an instant outside my barrel , i dived behind the fore - sail , made a double towards the stern , and came out upon the open deck in time to join hunter and dr livesey in the rush for the weather bow
  我能听见人们跌跌撞撞地从特舱和水手舱里跑出来，于是我立即从苹果桶里溜了出来，钻到了前桅帆的下面，又转身到了船尾，及时地跑到了开阔的甲板上，和亨特利弗西医生一道冲到了露天的船首。
• For displaying the initial date aquired from sea chart correctly in three different display modes ( relative head up motion , relative north up motion , true north up motion ) , a series of coordinate conversion are necessary . in the second chapter , data structure and various coordinates conversion are discussed in details
  要使从海图录入的原始数据能够在3种不同的显示方式(船首向上的相对运动显示方式、北向上的相对运动显示方式和北向上真运动显示方式)下正确的显示出来，必然要在几个坐标系(图板坐标系、屏幕坐标系、平面直角坐标系和地理坐标系)中进行一系列的坐标变换。
• Radar echoes include echoes of lands , islands , all kinds of moving targets , racon , sart and sea , etc . arpa marks consist of fixed range marker , variable range marker , electronic bearing line , guard zone , heading - line , parallel index ( 4 navigation lines ) , vector lines ( or pad ) and past track information of tracked target ships , marks of trial manoeuvres , ect
  雷达回波包括陆地、岛屿回波，各种活动目标的回波，雷康、 sart回波，海杂波等。 arpa符号包括包括固定距标圈、活动距标圈、电子方位线、警戒圈、船首线、 pi线、已录取目标的矢量线以及历史航迹(或pad ) 、试操船符号等。
• The crews raced for the beach ; but the boat i was in , having some start , and being at once the lighter and the better manned , shot far ahead of her consort , and the bow had struck among the shoreside trees , and i had caught a branch at swung myself out , and plunged into the nearest thicket , while silver and the rest were still a hundred yards behind
  水手们竞先向岸划去，但是我乘的划子，由于起划略早，舟身较轻，配备的桨手好一些，远远地划在它的同伴的前头，船首一头插在岸上的树丛里，于是我一把拽住根枝条，荡了出去，接着便钻进了最近的灌木丛，这时西尔弗和其余的人还在身后一百码的地方哩。
• They were , says mr stephen , and the end was that the men of the island , seeing no help was toward as the ungrate women were all of one mind , made a wherry raft , loaded themselves and their bundles of chattels on shipboard , set all masts erect , manned the yards , sprang their luff , heaved to , spread three sheets in the wind , put her head between wind and water , weighed anchor , ported her helm , ran up the jolly roger , gave three times three , let the bullgine run , pushed off in their bumboat and put to sea to recover the main of america
  “此语不差” ，斯蒂芬先生曰， “其结果，本岛男子发现负情女子异口同声，无可救药。遂建造舟筏，携家财登船，桅杆尽皆竖起，举行登舷礼，转船首向风，顶风停泊，扬起三面帆，在风与水之间挺起船首，起锚，转舵向左，海盗旗迎风飘扬，三呼万岁，每次三遍，开动舱底污水泵，离开兜售杂物之小舟，驶至海面上，航往美洲大陆。 ”
• Based on the above work , the calculation formulae of nominal slamming pressure and the bearing capability of the bottom plates in the rules are modified , and the safety coefficients are evaluated referring to the target reliability specification , then the more reasonable formula of assessing the slamming strength of bottom of the bow is given
  在上述工作的基础上，对我国建造规范中原有的砰击压力名义值和底板承载能力名义值的计算公式进行了修正，并参照选定的目标可靠性指标求出了安全系数，给出了更为科学合理的船首底部砰击强度定值评定公式。
• In general , the upward amplitude curve " curvature is larger , and it changes quicker . on the contrary , the downward is smaller and slower ; because the flare force contains the square of the wave elevation velocity , it results in an difference between the flare force frequence and the associated moving frequence ; the flare force decreases the downward amplitude of heaving oscillations ; the speed of ship has an ignorant effect on the peak values of three calculated values , but there is an obvious effect on the oscillating frequence ; the wave amplitude has an effect on the ship motion , and there is an linear relation between the oscillating amplitude and the wave amplitude on the whole . by the way , there are some experiences and lessons according to the progress calculation : before the calculation of the ship motion , we should checkout the balance in a calm water firstly , namely , the whole displace of ship and the longitudinal position of the center of gravity must be consistent with the draft in calm water , or else , the calculation may show the " floating " phenomenon ; the mixed language programming has a lot of virtues , but it exists a fatal limitation - the debug of dll
  研究表明：在某些频率范围内相关水动力系数基本不随吃水变化，只有超过某一频率后水动力系数的值才会出现差异；在横摇方向，水动力系数并没有随着吃水的变化发生规则变化，而是出现了波动现象；近船首剖面的水动力系数计算表明，水动力系数的波动非常大，并远远偏离了平均位置的水动力系数值，值的变化速率也不尽相同，总的看来，上振幅曲线曲率较大，变化较快，下振幅曲线曲率较小，变化较慢；外飘力和波面运动的速度的平方项有关，导致其振动频率和相应运动方向的频率不同；外飘力使升沉向下运动的幅值减小；船速对三个计算量的峰值影响甚微，但对振动频率有明显影响；波幅对船舶运动的影响是明显的，船舶运动的幅值基本上和波幅成线性关系。