Study on mixed language programming with fortran and based object languages 與基于對象語言的混合編程研究
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:在某些頻率范圍內(nèi)相關(guān)水動力系數(shù)基本不隨吃水變化,只有超過某一頻率后水動力系數(shù)的值才會出現(xiàn)差異;在橫搖方向,水動力系數(shù)并沒有隨著吃水的變化發(fā)生規(guī)則變化,而是出現(xiàn)了波動現(xiàn)象;近船首剖面的水動力系數(shù)計算表明,水動力系數(shù)的波動非常大,并遠遠偏離了平均位置的水動力系數(shù)值,值的變化速率也不盡相同,總的看來,上振幅曲線曲率較大,變化較快,下振幅曲線曲率較小,變化較慢;外飄力和波面運動的速度的平方項有關(guān),導致其振動頻率和相應(yīng)運動方向的頻率不同;外飄力使升沉向下運動的幅值減?。淮賹θ齻€計算量的峰值影響甚微,但對振動頻率有明顯影響;波幅對船舶運動的影響是明顯的,船舶運動的幅值基本上和波幅成線性關(guān)系。