检索结果-南通市图书馆

Optimization Design of Minimum Total Resistance Hull Form Based on CFD Method

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2018年第3期32卷 323-330页

作者： zhang bao-ji zhang Sheng-long zhang Hui College of Ocean Science and Engineering Shanghai Maritime University Merchant Marine College Shanghai Maritime University

In order to reduce the resistance and improve the hydrodynamic performance of a ship, two hull form design methods are proposed based on the potential flow theory and viscous flow theory. The flow fields are meshed using body-fitted mesh and structured grids. The parameters of the hull modification function are the design variables. A three-dimensional modeling method is used to alter the geometry. The Non-Linear Programming(NLP) method is utilized to optimize a David Taylor Model Basin(DTMB) model 5415 ship under the constraints, including the displacement constraint. The optimization results show an effective reduction of the resistance. The two hull form design methods developed in this study can provide technical support and theoretical basis for designing green ships.

关键词： total resistance hull form design CFD technique Non-Linear Programming(NLP)

THE OPTIMIZATION OF THE HULL FORM WITH THE MINIMUM WAVE MAKING RESISTANCE BASED ON RANKINE SOURCE METHOD

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2009年第2期21卷 277-284页

作者： zhang bao-ji MA Kun ji Zhuo-shang State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian116024 China Ship CAD Engineering Center Dalian University of Technology Dalian 116024 China

The hull form optimization concerns one of the most important applications of wave making resistance theories. In order to obtain a hull form with the minimum wave making resistance, an optimization design method based on the CFD is proposed, which combines the Rankine source method with the nonlinear programming （NLP）. The bow-body shape is optimized with the minimum wave making resistance as the objective function. A hull form modification function is introduced to represent an improved hull surface, which can be used to generate a new smooth hull surface by multiplying it by the offset data of the original hull surface. The parameters of the hull form modification function are taken as the design variables. Other constraint conditions can also be considered, for example, in optimizing the lines of the bow, appropriate displacements can be taken as the basic constraints. S60 hull form is selected as the original hull. Three improved hulls are obtained by optimal design. Rankine source method proves to be an effective method in ship form optimization based on analysis of the resistance performance and lines of the improved hull.

关键词： Rankine source method CFD NLP optimization method,wave making resistance

Research on Bulbous Bow Optimization Based on the Improved PSO Algorithm

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2017年第4期31卷 487-494页

作者： zhang Sheng-long zhang bao-ji Tahsin TEZDOGAN XU Le-ping LAI Yu-yang Merchant Marine College Shanghai Maritime University Shanghai 201306 China College of Ocean Environment and Engineering Shanghai Maritime University Shanghai 201306 China Department of Naval Architecture & Ocean and Marine Engineering University of Strathclyde Glasgow G4 0LZ UK Beijing Soyotec Co. Ltd. Beijing 100062 China

In order to reduce the total resistance of a hull, an optimization framework for the bulbous bow optimization was presented. The total resistance in calm water was selected as the objective function, and the overset mesh technique was used for mesh generation. RANS method was used to calculate the total resistance of the hull. In order to improve the efficiency and smoothness of the geometric reconstruction, the arbitrary shape deformation （ASD） technique was introduced to change the shape of the bulbous bow. To improve the global search ability of the particle swarm optimization （PSO） algorithm, an improved particle swarm optimization （IPSO） algorithm was proposed to set up the optimization model. After a series of optimization analyses, the optimal hull form was found. It can be concluded that the simulation based design framework built in this paper is a promising method for bulbous bow optimization.

关键词： bulbous bow overset mesh RANS method ASD technique IPSO algorithm

Research on Design Method of the Full Form Ship with Minimum Thrust Deduction Factor

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2015年第2期29卷 301-310页

作者：张宝吉缪爱琴张竹心 College of Ocean Environment Engineering Shanghai Maritime University

In the preliminary design stage of the full form ships, in order to obtain a hull form with low resistance and maximum propulsion efficiency, an optimization design program for a full form ship with the minimum thrust deduction factor has been developed, which combined the potential flow theory and boundary layer theory with the optimization technique. In the optimization process, the Sequential Unconstrained Minimization Technique（SUMT） interior point method of Nonlinear Programming（NLP） was proposed with the minimum thrust deduction factor as the objective function. An appropriate displacement is a basic constraint condition, and the boundary layer separation is an additional one. The parameters of the hull form modification function are used as design variables. At last, the numerical optimization example for lines of after-body of 50000 DWT product oil tanker was provided, which indicated that the propulsion efficiency was improved distinctly by this optimal design method.

关键词： optimization minimum thrust deduction factor NLP Rankine source method boundary layer separation

Status quo and countermeasures of energy audit in oil and gas field enterprises

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Accounting and Auditing 2008年第12期4卷 13-16页

作者： zhang Guang-bao SHI ji-kun School of Economic Management Daqing Petroleum Institute Daqing 163318 China

To develop energy audits in oil and gas field enterprises has important and realistic significance. Chinese energy audit in oil and gas field enterprises is still in the exploratory stage, the paper puts forward some ... 详细信息

关键词： oil and gas field enterprises energy audit power-wasting facility evaluation system

基于Rankine源法的兴波阻力数值计算研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

大连理工大学学报 2009年第6期49卷 872-875页

作者：张宝吉马坤纪卓尚大连理工大学船舶CAD工程中心辽宁大连116024

以边界元法为基础,以Rankine源函数作为基本解,编制了兴波阻力数值计算程序,分别计算了数学船型Wigley、S60船型和实船26000t成品油船的兴波阻力,并将所得的计算结果与船模阻力试验值及Michell积分法相比较,结果表明Rankine源法和试验... 详细信息

以边界元法为基础,以Rankine源函数作为基本解,编制了兴波阻力数值计算程序,分别计算了数学船型Wigley、S60船型和实船26000t成品油船的兴波阻力,并将所得的计算结果与船模阻力试验值及Michell积分法相比较,结果表明Rankine源法和试验值比较接近,本方法可靠实用.

关键词：边界元法 Rankine源数值计算兴波阻力

在线全文

学校读者我要写书评

暂无评论

基于遗传算法的最小阻力船型优化设计

船舶力学 2011年第4期15卷 325-331页

作者：张宝吉马坤纪卓尚上海海事大学海洋环境与工程学院上海201308 大连理工大学船舶CAD工程中心辽宁大连116024

遗传算法是一种全局最优化算法,它能够克服传统优化方法的缺点和不足,从而获得全局最优解。因此,为了获得阻力性能更好的优良船型,将遗传算法进行适当改进并用于船型优化中,进行最小阻力船型优化设计,以非线性兴波阻力理论(Rankine源法... 详细信息

遗传算法是一种全局最优化算法,它能够克服传统优化方法的缺点和不足,从而获得全局最优解。因此,为了获得阻力性能更好的优良船型,将遗传算法进行适当改进并用于船型优化中,进行最小阻力船型优化设计,以非线性兴波阻力理论(Rankine源法)为基础,利用遗传算法并结合CAD技术进行船型优化设计。在优化过程中,把总阻力作为目标函数,设计变量取船型修改函数的参数,确保排水量为基本约束条件下,对船体前半体型线进行优化研究。选取某高速巡逻艇作为初始船型进行优化计算,获得的最优船型总阻力降低了13.1%,兴波阻力降低了21.7%,表明遗传算法用于船体线型优化设计是行之有效的。

关键词：遗传算法最小阻力船型 Rankine源法优化设计

在线全文

学校读者我要写书评

暂无评论

基于自适应小生境遗传算法的船型优化

计算机工程 2011年第8期37卷 207-209页

作者：张宝吉上海海事大学海洋环境与工程学院上海201306

自适应小生境遗传算法能够克服基本小生境遗传算法操作复杂和计算费时的缺陷,同时具有保持种群的稳定性,获取合适的子种群规模,从而更快地获得最优解的特点。为快速获得阻力性能优良的船型,以势流兴波阻力理论Rankine源法为基础,采用自... 详细信息

自适应小生境遗传算法能够克服基本小生境遗传算法操作复杂和计算费时的缺陷,同时具有保持种群的稳定性,获取合适的子种群规模,从而更快地获得最优解的特点。为快速获得阻力性能优良的船型,以势流兴波阻力理论Rankine源法为基础,采用自适应小生境遗传算法并结合CAD技术进行船型优化设计。S60船型的优化算例结果表明,采用自适应小生境遗传算法进行船型优化具有可行性。

关键词：基本小生境遗传算法自适应小生境遗传算法 Rankine源法优化设计

在线全文

学校读者我要写书评

暂无评论

船体线型最优化设计方法

大连海事大学学报 2010年第2期36卷 23-26页

作者：张宝吉马坤上海海事大学海洋环境与工程学院上海201308 大连理工大学船舶CAD工程中心辽宁大连116024

为快速生成阻力性能优良船型,开发具有自主知识产权的船体线型优化设计程序,以总阻力为目标函数,以船型修改函数的参数为设计变量,在保证必要排水量条件下,建立基于非线性规划法的数学模型.选取某高速水面舰船为母型,分别对前半体的不... 详细信息

为快速生成阻力性能优良船型,开发具有自主知识产权的船体线型优化设计程序,以总阻力为目标函数,以船型修改函数的参数为设计变量,在保证必要排水量条件下,建立基于非线性规划法的数学模型.选取某高速水面舰船为母型,分别对前半体的不同范围进行优化设计,获得改良船型的阻力性能和线型特点,并找出其中的变化规律,为新船型开发和船型优化提供理论基础和技术支持.

关键词：船体线型优化 Rankine源法非线性规划法(NLP)