大型油船艏部線型優(yōu)化
發(fā)布時間：2019-02-15 06:53
【摘要】：海上運輸被認(rèn)為是最有效的交通運輸方式之一。然而,隨著環(huán)保意識增強(qiáng)與預(yù)期的對碳排放的結(jié)構(gòu)調(diào)整,航運業(yè)將被要求通過一切手段減少其對環(huán)境的影響。國際海事組織制定了自己的規(guī)則,要求截止2030年降低航運業(yè)30%的碳排放量,因此所有新船將采用(能效設(shè)計指數(shù))EEDI,所有運行中的船舶將使用能源效率管理計劃("SEEMP")。球鼻艏改造是應(yīng)對‘'SEEMP"船舶能源效率管理計劃關(guān)于運營船舶的解決方案之一。隨著預(yù)期的石油價格的上漲及對碳排放征收重稅的引進(jìn),目前迫切需要通過優(yōu)化一些特定的部分如球鼻艏及節(jié)能設(shè)備,重新設(shè)計運行中的船舶,減小船舶阻力,以提高其工作效率。本文對通過優(yōu)化船體線型減小船舶阻力的方法進(jìn)行研究。所使用的優(yōu)化方法,應(yīng)用了與流體動力(CFD)求解器Shipflow集成一體的Friendship-Framework的CAE平臺,該仿真驅(qū)動的優(yōu)化設(shè)計可以在廣泛的設(shè)計變量范圍內(nèi)對船體形狀作系列幾何變化,達(dá)到減少船舶阻力的目的。這個方法的有效性,將由一艘KVLCC2油船的優(yōu)化結(jié)果顯示。在球鼻艏優(yōu)化時,可能出現(xiàn)濕表面面積增加的情況,這導(dǎo)致粘性阻力的增加,但是從船舶總阻力的降低結(jié)果可知,使用所化的優(yōu)策略依然是成功的�；诒驹O(shè)計的實例可見,KVLCC2油船線型優(yōu)化方法對同類船舶的線型優(yōu)化有參考價值。為優(yōu)化船舶線型,減小船舶阻力,采用了三個優(yōu)化階段。 (i)船尾部分修改,以產(chǎn)生最佳的新的船體;(ii)對球鼻艏進(jìn)行參數(shù)化優(yōu)化設(shè)計并添加于新的船體(來自于i階段),優(yōu)化生成一個新的球鼻艏船型。(iii)最后,使用切線搜索設(shè)計引擎(TSearch),根據(jù)B樣條曲線創(chuàng)建船體型值點的縱向移動,該B樣條曲線的頂點被第7章所描述的優(yōu)化算法控制,實現(xiàn)了對船體型線的優(yōu)化。優(yōu)化計算的結(jié)果清楚地顯示了總阻力減少了2.43%,同時波浪模式表明,發(fā)散波已經(jīng)顯著減少。
[Abstract]:Maritime transport is considered to be one of the most effective modes of transportation. However, with increased environmental awareness and expected structural adjustments to carbon emissions, the shipping industry will be required to do everything in its power to reduce its impact on the environment. The International Maritime Organization has its own rules for reducing the shipping industry's carbon emissions by 30% by 2030, so that all new ships will adopt the (Energy efficiency Design Index) EEDI, All ships in operation will use the Energy efficiency Management Plan ("SEEMP"). The bulbous bow modification is one of the solutions to the 'SEEMP' ship energy efficiency management plan. With the expected rise in oil prices and the introduction of heavy taxes on carbon emissions, there is an urgent need to redesign ships in operation by optimizing certain parts, such as bulbous bow and energy-saving equipment, in order to reduce ship resistance. To improve its working efficiency. In this paper, the method of reducing ship resistance by optimizing hull alignment is studied. The CAE platform of Friendship-Framework integrated with hydrodynamic (CFD) solver Shipflow is used in the optimization method. The simulation driven optimization design can make a series of geometric changes to the hull shape in a wide range of design variables. The purpose of reducing ship resistance is achieved. The effectiveness of this method will be demonstrated by the optimization results of a KVLCC2 tanker. When the bulbous bow is optimized, the wet surface area may increase, which leads to the increase of the viscous resistance. However, from the results of the reduction of the total resistance of the ship, it can be seen that the optimized strategy is still successful. Based on the example of this design, it can be seen that KVLCC2 tanker alignment optimization method has reference value for the same ship alignment optimization. In order to optimize ship alignment and reduce ship resistance, three optimization stages are adopted. The (i) stern part is modified to produce the best new hull; (ii) optimizes the bulbous bow and adds it to the new hull (from phase I), optimizes the generation of a new bulbous bow. (iii), and uses the tangent search design engine (TSearch), According to the B-spline curve, the longitudinal movement of the ship body value point is created. The vertex of the B-spline curve is controlled by the optimization algorithm described in Chapter 7, which realizes the optimization of the ship shape line. The results of the optimization calculation clearly show that the total resistance is reduced by 2.43, and the wave model shows that the divergence wave has been significantly reduced.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U674.133.1
[Abstract]:Maritime transport is considered to be one of the most effective modes of transportation. However, with increased environmental awareness and expected structural adjustments to carbon emissions, the shipping industry will be required to do everything in its power to reduce its impact on the environment. The International Maritime Organization has its own rules for reducing the shipping industry's carbon emissions by 30% by 2030, so that all new ships will adopt the (Energy efficiency Design Index) EEDI, All ships in operation will use the Energy efficiency Management Plan ("SEEMP"). The bulbous bow modification is one of the solutions to the 'SEEMP' ship energy efficiency management plan. With the expected rise in oil prices and the introduction of heavy taxes on carbon emissions, there is an urgent need to redesign ships in operation by optimizing certain parts, such as bulbous bow and energy-saving equipment, in order to reduce ship resistance. To improve its working efficiency. In this paper, the method of reducing ship resistance by optimizing hull alignment is studied. The CAE platform of Friendship-Framework integrated with hydrodynamic (CFD) solver Shipflow is used in the optimization method. The simulation driven optimization design can make a series of geometric changes to the hull shape in a wide range of design variables. The purpose of reducing ship resistance is achieved. The effectiveness of this method will be demonstrated by the optimization results of a KVLCC2 tanker. When the bulbous bow is optimized, the wet surface area may increase, which leads to the increase of the viscous resistance. However, from the results of the reduction of the total resistance of the ship, it can be seen that the optimized strategy is still successful. Based on the example of this design, it can be seen that KVLCC2 tanker alignment optimization method has reference value for the same ship alignment optimization. In order to optimize ship alignment and reduce ship resistance, three optimization stages are adopted. The (i) stern part is modified to produce the best new hull; (ii) optimizes the bulbous bow and adds it to the new hull (from phase I), optimizes the generation of a new bulbous bow. (iii), and uses the tangent search design engine (TSearch), According to the B-spline curve, the longitudinal movement of the ship body value point is created. The vertex of the B-spline curve is controlled by the optimization algorithm described in Chapter 7, which realizes the optimization of the ship shape line. The results of the optimization calculation clearly show that the total resistance is reduced by 2.43, and the wave model shows that the divergence wave has been significantly reduced.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U674.133.1
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