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针对高压空气吹除水舱时剧烈气液混合流动,难以准确计算出其内部复杂流态下舱壁压力与完成吹除的所需时间,本文提出基于MPCCI平台进行一维管网和三维水舱耦合联合的仿真方法。首先建立高压空气吹除水舱数学模型,并运用Flowmaster软件对水舱吹除提供并分配动力的整个管网系统进行建模与仿真,得到各工况下管网内各节点处的压力、质量流量等参数;然后运用MpCCI平台实现Flowmaster和Fluent的联合仿真,对高压空气吹除系统进行一维管网和三维水舱耦合仿真分析,实现了吹除系统的多舱、动态和耦合的求解,得到多舱同时吹除过程中水舱中气-液混合现象、壁面压力变化及水舱排水速率等。最后对一维仿真结果与一维-三维耦合联立仿真结果进行对比,得到的水舱出口排水速率曲线有着较好的一致性。 相似文献
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根据最小重量原则及耐压舱的使用要求,结合规范和有限元方法设计工作潜深为2 000 m的钛合金圆柱耐压舱,并对带有多个开孔的端部平盖封头进行结构设计与校核。针对圆柱舱建立参数化结构有限元模型,并在Isight集成优化环境下进行结构优化并获得最优解。对耐压舱进行打压试验,验证了设计方法的有效性,深海压力舱满足力学性能和重量要求。 相似文献
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耐压液舱区域的耐压壳体在外载荷作用下发生破坏,其破坏原因与相邻耐压壳体的受力相关,相邻耐压壳体的变形对其影响往往很大。在吸收现有潜艇耐压液舱结构理论计算方法、有限元分析和试验研究的基础上,对其结构破坏原因及加强形式进行了探讨。 相似文献
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[Objective]To simplify the ship modeling process and improve modeling efficiency, this paper proposes a method for rapidly implementing hull model creation based on hull line drawing.[Methods]Using the CATIA platform, this method adopts the component application architecture (CAA) development tool for secondary development. First, by reading the geometry elements and label information of the hull lines in a drawing, the transformation of the offset points from 2D to 3D is realized. On this basis, the creation of the hull lines, stern and bow is completed, and a 3D wireframe model obtained. Finally, the hull 3D modeling is completed in conjunction with the CATIA native surface creation command. The stability and reliability verification of the developed type value extraction and bow generation program is then carried out via application analysis.[Results]The results show that the compiled program can realize the automatic creation of offset points, transverse lines, waterlines, profile lines and other boundary lines except the top line of the wall, and the centerline and tangent lines created by the bow generator are easily modified and simple for users to operate. [Conclusions]The verification results show that the method of a creating hull model using "Generative Shape Design" and "Drafting" with the hull line drawing as the data input is stable, reliable and able to realize rapid hull modeling, giving it certain practical value. © The Author(s) 2022. 相似文献
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结合大型巡航救助船的功能需求和主尺度特点,对其快速性能进行分析。运用计算流体力学(CFD)技术对原型方案的线型进行阻力性能计算,依据计算信息,分别对首轮廓线形状、球首、呆木以及支架进行优化,得到最终方案,阻力相比原型方案有了大幅降低。将最终方案进行模型试验,模型试验结果与CFD计算吻合良好,证明了本船所采用的优化方法是可靠可用的。 相似文献
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文章提出了可以计及局部腐蚀损伤影响的等效层合单元方法,建立了局部腐蚀等效弹性模量计算公式,针对耐压壳体局部腐蚀深度、腐蚀强度、腐蚀范围和初挠度进行了系列稳定性数值计算,通过计算结果的对比分析提出了将局部腐蚀等效为附加多波挠度的稳定性近似计算方法,给出了附加挠度幅值的计算公式,可用于耐压壳体局部腐蚀的稳定性分析。 相似文献
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舰船船体曲面建模标准研究 总被引:1,自引:1,他引:0
在对复杂曲面建模技术进行分析、对国内船体曲面设计方法进行研究以及对曲面建模软件实际应用情况进行了解的基础上,对我国舰船船体曲面建模标准进行探讨,确定标准的基本内容,这对于规范船体曲面建模将具有积极的指导作用。 相似文献
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A new model for the simulation of spilling breaking waves in naval flows is presented. The hydrostatic pressure is used in order to mimic the weight of the breaker on the underlying flow, as in the model of Cointe and Tulin, whereas the algorithm for detecting the breaking inception and the definition of its geometry are completely new and are suitable for the simulation of three–dimensional flows around ships hulls. The model has been implemented in a finite-volume code developed for naval flows, and its performances have been validated against experimental data for a submerged profile, an S60 hull in drift motion, and the US Combatant DTMB 5415 model on a straight course. 相似文献
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ZHAN Yi-ting JI Zhuo-shang LIU Yin-dong 《船舶与海洋工程学报》2007,6(2):37-43
Methods used for digital ship design were studied and formed the basis of a proposed frame model suitable for ship construction modeling. Based on 3-D modeling software, a digital design system for hull structures was developed. Basic software systems for modeling, modifying, and assembly simulation were developed. The system has good compatibility, and models created by it can be saved in different 3-D file formats, and 2D engineering drawings can be output directly. The model can be modified dynamically, overcoming the necessity of repeated modifications during hull structural design. Through operations such as model construction, intervention inspection, and collision detection, problems can be identified and modified during the hull structural design stage. Technologies for centralized control of the system, database management, and 3-D digital design are integrated into this digital model in the preliminary design stage of shipbuilding. 相似文献
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The research performed in this paper was carried out to investigate the computational procedure to design seakeeping optimized ship hull form. To reach the optimized hull form, four stages should be done, which consists of: generate alternative hull form, seakeeping calculations, objective functions and optimization techniques. There are many parameters that may be determined in ship hull form optimization. This paper deals with developed strip theory for determining the seakeeping performance, genetic algorithm(GA) as optimization method, high order equations for curve fitting of the hull form and finally reaching to the minimum bow vertical motion in regular head waves. The Wigley hull is selected as an initial hull and carried to be optimized. Two cases are considered. For the first case, the only form coefficients of the hull(C B, C M, C W, C P) are changed and main dimensions(L, B, T) are fixed. In the second case both hull form and main dimensions are varied simultaneously. Finally, optimized hull form and its seakeeping performances are presented. The results of optimization procedure demonstrate that the optimized hull forms yield a reduction in vertical motion and acceleration. 相似文献