Analysis and calculation of the hydrodynamic force of lifting pipes in a 1 km pilot-scale mining system of polymetallic nodules
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摘要: 大洋多金屬結核1km海上開采實驗系統的揚礦管所受水平液動力由多個參數決定.本文從系統總體設計參數出發,得出了其他各種參數值,并根據Morison方程詳細推導了海浪和海流的速度和加速度的表達式,最后采用數值積分的方法得出了液動力隨時間和深度的變化曲線.在同一水深處,總液動力隨時間的變化規律接近于正弦(余弦)曲線;而在同一時刻,總液動力則隨水深絕對值的增加而遞減,在水深0m至水深-200m內,遞減速度很快;總液動力最大值為3.790kN.Abstract: The hydrodynamic force of lifting pipes in a 1 km pilot-scale mining system of polymetallic nodules is determined by many parameters. Based on the integrated design parameters of the 1 km pilotscale mining system, the suitable wave theory was selected and all kinds of parameters were presented. A numerical integration procedure was formulated for calculation of the hydrodynamic force according to the Morison equation. The relationship among the force, time and depth below ocean surface was finally studied. At the same depth below ocean surface, the total hydrodynamic force is varied with increasing time as a function of sine. While at the specified time, the total hydrodynamic force is decreased with increasing depth below ocean surface. The lapse rate is particularly fast from 0 to 200 m in depth. The maximum of hydrodynamic force is 3. 790 kN.
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Key words:
- ocean mining /
- polymetallic nodules /
- lifting pipe /
- hydrodynamic force /
- drag force /
- inertia force /
- morison equation
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