共查询到19条相似文献,搜索用时 218 毫秒
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船舶结构混合变量优化的遗传算法 总被引:10,自引:2,他引:8
本文针对船舶结构优化设计中普遍存在的混合离散变量现象,对遗传算法进行了若干探讨和改进,以直接获得实用的最优解。通过两个船舶结构优化的算例,验证了本文方法的有效性。 相似文献
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基于神经网络理论的船舶结构可靠性优化设计 总被引:1,自引:1,他引:0
本文将人工神经网络理论应用于船舶纵向结构的可靠性优化设计中,采用模拟退火和玻尔茨曼机原理,在优化过程中可避开局部最优解,取得系统的近似最优解。 相似文献
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基于参数灵敏度分析方法完成了漂浮物推拖船的结构优化设计。在对整船结构的设计变量进行约束基础上,建立了整船结构优化模型。通过优化板材厚度和骨材型号等离散模型,使得船体结构满足相应的频率特征和强度要求。通过模拟退火算法分析漂浮物推拖船静态和动态特性,并建立其优化模型。实验结果表明:基于参数灵敏度分析的结构优化可以减轻船舶整体结构质量,且在满足强度和刚度需要的前提下具备较高的自然频率裕度和较低的振动频率。优化后,全船总质量降低5.31 t,一阶垂直频率减少10.086 7 Hz,二阶垂直频率减少10.572 8 Hz。 相似文献
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介绍神经风格的模拟退火优化算法的基本思路、计算步骤及特点,并阐述了随机神经网络系统理论应用于舰船舯剖面结构优化设计的新方法。 相似文献
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潜艇环肋圆柱壳结构的模糊优化 总被引:1,自引:1,他引:0
本文针对潜艇普通环肋圆柱壳结构设计的特点,建立了潜艇普通环肋圆柱壳结构尺寸优化的数学模型,并考虑到在该结构设计中存在的不确定因素,进行结构的模糊优化设计。采用约束非线性混合离散变量优化方法,直接获得离散变量的最优解,无需作规格化处理。算例表明本文方法简便实用,结果合理。 相似文献
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船体结构耐撞性优化设计的主要目的是在船舶碰撞研究的基础上对结构进行优化设计,提高船体结构的耐撞性能。基于正交试验设计、BP神经网络和遗传算法,形成了船体结构耐撞性能优化设计方法。提出了一种耐撞性综合指标,并以此指标作为优化的目标函数,以结构质量为约束条件,利用MSC/Dytran有限元软件对船舶碰撞进行数值仿真,完成对某船舷侧结构进行耐撞性优化设计,结果表明优化过后结构耐撞性能有较大提高,这为结构耐撞性能优化设计提供了一种新的思路和方法。 相似文献
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探讨如何运用协同优化方法解决多破损模式下船舶结构设计的优化问题。在协同优化方法的基本理论框架下,研究多破损模式条件下的结构并行设计和优化,建立相应的优化模型。以多破损模式下的船体结构静力学优化为例,运用协同优化方法进行优化计算,获得较好的破损残余强度。算例表明,协同优化方法能有效地解决多破损模式下的结构优化问题。 相似文献
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In considering the theory of structural dynamic optimization design, a design method of the structural style of ship composite brace with rigid vibration isolation mass was studied. Two kinds of structural dynamic optimization formulations minimizing the vibration acceleration of the non-pressure hull on the restraining condition of the gross weight of the ship cabin were established: 1) dynamic optimization of the sectional dimensions of the rigid vibration isolation mass in the composite brace; 2) dynamic optimization of the arranging position of the rigid vibration isolation mass. Through the optimization results, sectional dimensions and the arranging position of the rigid vibration isolation mass with better performance in reducing vibration were gained, and some reference was provided for practical engineering designs as well as enrichment of the design method of a novel ship vibration-isolation brace. 相似文献
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A new multi-level analysis method of introducing the super-element modeling method, derived from the multi-level analysis method first proposed by O. F. Hughes, has been proposed in this paper to solve the problem of high time cost in adopting a rational-based optimal design method for ship structural design. Furthermore,the method was verified by its effective application in optimization of the mid-ship section of a container ship. A full 3-D FEM model of a ship,suffering static and quasi-static loads, was used as the analyzing object for evaluating the structural performance of the mid-ship module, including static strength and buckling performance. Research results reveal that this new method could substantially reduce the computational cost of the rational-based optimization problem without decreasing its accuracy, which increases the feasibility and economic efficiency of using a rational-based optimal design method in ship structural design. 相似文献
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码头轴线方位角直接影响系泊船舶对码头结构作用的大小,从而影响结构设计要求,因此对码头轴线方位角进行优化分析十分必要。基于实际工程算例,提出风流环境荷载作用下码头最优方位角的确定方法即分层流要素确定法,并与设计中常用的垂线平均流向法、船舶吃水范围平均流向法进行比较分析。同时,研究船舶荷载的主导因素与流速及码头方位角之间的关系。结果表明:3种方法优化得到的最优方位角是有区别的,区别大小与流速分层要素分布关系密切,鉴于分层流要素法更能贴近实际流状态,对于大型开敞式码头结构,推荐采用分层流要素分析法综合确定码头轴线最优方位角。 相似文献
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舰船刚性阻振质量基座振动特性优化设计 总被引:1,自引:0,他引:1
基于结构动力学优化设计理论,研究了舰船刚性阻振质量基座结构形式的设计方法。在满足基座舱段总重量限制的约束条件下,分别建立了刚性阻振质量布置及截面尺寸优化设计模型,并进行了以基座舱段耐压壳体振动加速度为目标函数的动力学优化设计。通过优化分析,得到了在给定约束条件下减振效果最佳的刚性阻振质量截面尺寸和布置。研究结果表明,刚性阻振质量基座中阻振质量高度越大,基座舱段耐压壳体平均振动加速度级就越小。通过优化设计可以找到满足要求的结构,分析得到目标函数随设计变量的变化趋势,并对此优化方法的有效性进行验证。 相似文献
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支持向量机和遗传算法组合策略的VLCC船中结构优化设计(英文) 总被引:1,自引:0,他引:1
In this paper a hybrid process of modeling and optimization,which integrates a support vector machine(SVM) and genetic algorithm(GA),was introduced to reduce the high time cost in structural optimization of ships.SVM,which is rooted in statistical learning theory and an approximate implementation of the method of structural risk minimization,can provide a good generalization performance in metamodeling the input-output relationship of real problems and consequently cuts down on high time cost in the analysis of real problems,such as FEM analysis.The GA,as a powerful optimization technique,possesses remarkable advantages for the problems that can hardly be optimized with common gradient-based optimization methods,which makes it suitable for optimizing models built by SVM.Based on the SVM-GA strategy,optimization of structural scantlings in the midship of a very large crude carrier(VLCC) ship was carried out according to the direct strength assessment method in common structural rules(CSR),which eventually demonstrates the high efficiency of SVM-GA in optimizing the ship structural scantlings under heavy computational complexity.The time cost of this optimization with SVM-GA has been sharply reduced,many more loops have been processed within a small amount of time and the design has been improved remarkably. 相似文献