以多功能全回转起重船为研究对象,针对起重机起吊重物并做大角度回转作业工况,建立多目标优化数学模型,以各个压载舱调载量最大值最小、起重机起吊重物回转过程中船舶纵倾角最小和横倾角最小作为三个优化目标,利用多目标遗传算法,求解...以多功能全回转起重船为研究对象,针对起重机起吊重物并做大角度回转作业工况,建立多目标优化数学模型,以各个压载舱调载量最大值最小、起重机起吊重物回转过程中船舶纵倾角最小和横倾角最小作为三个优化目标,利用多目标遗传算法,求解获得配载方案最优集,同时利用基于熵权的TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)方法,客观准确地得到压载调拨与吊机作业配合的最终配载方案。结果表明利用AQWA(Advanced Quantitative Wave Analysis)静水力分析可较为准确地获得船舶重心与倾角的关系,且多目标优化方法可输出多个最优配载方案,多准则决策方法可结合工程经验和客观性输出最终配载方案,该优化决策方法可高效得到简单有效的起重船配载方案,为工程中的压载优化提供参考。展开更多
基于多学科交叉技术,本文提出了一种考虑运动和动力耦合的复杂多体系统优化设计分析方法。基于ADAMS(Automatic Dynamic Analysis of Mechanical Systems)平台建立全回转重吊船刚柔耦合虚拟样机,以AQWA(Advanced Quantitative Wave Anal...基于多学科交叉技术,本文提出了一种考虑运动和动力耦合的复杂多体系统优化设计分析方法。基于ADAMS(Automatic Dynamic Analysis of Mechanical Systems)平台建立全回转重吊船刚柔耦合虚拟样机,以AQWA(Advanced Quantitative Wave Analysis)软件计算的船体水动力时域响应作为运动驱动,完成典型服役海况下系统关键区域应力耦合响应特征分析。依托ANSYS有限元软件优化模块,结合客观熵权TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)决策方法得到该区域最优设计方案。分析表明:船体横摇及垂荡对支撑区域动力响应影响较大;相较船体静止,横摇、垂荡耦合运动使吊装绳索张力与支撑区域关键节点应力增幅均超过20%;对比初始方案支撑结构的钢材用量,最优方案可节省12.30%。将虚拟样机技术与有限元力学分析结合并融入管理科学的多目标优化和多准则决策,可提高复杂多体系统的分析效率,得到科学合理的设计方案。展开更多
All-solid-state lithium-sulfur(Li-S)battery is regarded as next-generation high energy density and safety battery system.The key challenge is to develop a compatible high-performance solid-state electrolyte.Herein,a t...All-solid-state lithium-sulfur(Li-S)battery is regarded as next-generation high energy density and safety battery system.The key challenge is to develop a compatible high-performance solid-state electrolyte.Herein,a two birds with one stone strategy is proposed to simultaneously enhance Li+conductivity and polysulfide adsorptivity of poly(ethylene oxide)(PEO)-based polymer electrolyte via the integration of Nb_(2)CT_(x)MXene.Moreover,the sheet size of Nb_(2)CT_(x)MXene is crucial for the enhancement of Li^(+)conductivity and polysulfide adsorptivity,attributing to the difference in a specific surface area related to the percolation effect.By tuning the sheet size of Nb_(2)CT_(x)MXene from 500-300 nm to below 100 nm,the ionic conductivity of the PEO electrolyte is increased to2.62×10^(-4)S·cm^(-1)with improved Li+transference number of 0.37 at 600C.Furthermore,theoretical calculation and X-ray photoelectron spectroscopy(XPS)conjointly prove that poly sulfides could be effectively adsorbed by Nb2CTxnanosheets via forming Nb-S bonding to inhibit their shuttle in the PEO framework.As a result,the all-solid-state Li-S cell exhibits an initial capacity of 1149 mAh·g^(-1)at 0.5C and good cycling stability with 491 mAh·g^(-1)after 200 cycles.The results demonstrate the necessity of polysulfide inhibition and the application of Nb_(2)CT_(x)MXene in PEO-based electrolytes for all-solid-state Li-S batteries.展开更多
文摘以多功能全回转起重船为研究对象,针对起重机起吊重物并做大角度回转作业工况,建立多目标优化数学模型,以各个压载舱调载量最大值最小、起重机起吊重物回转过程中船舶纵倾角最小和横倾角最小作为三个优化目标,利用多目标遗传算法,求解获得配载方案最优集,同时利用基于熵权的TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)方法,客观准确地得到压载调拨与吊机作业配合的最终配载方案。结果表明利用AQWA(Advanced Quantitative Wave Analysis)静水力分析可较为准确地获得船舶重心与倾角的关系,且多目标优化方法可输出多个最优配载方案,多准则决策方法可结合工程经验和客观性输出最终配载方案,该优化决策方法可高效得到简单有效的起重船配载方案,为工程中的压载优化提供参考。
文摘基于多学科交叉技术,本文提出了一种考虑运动和动力耦合的复杂多体系统优化设计分析方法。基于ADAMS(Automatic Dynamic Analysis of Mechanical Systems)平台建立全回转重吊船刚柔耦合虚拟样机,以AQWA(Advanced Quantitative Wave Analysis)软件计算的船体水动力时域响应作为运动驱动,完成典型服役海况下系统关键区域应力耦合响应特征分析。依托ANSYS有限元软件优化模块,结合客观熵权TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)决策方法得到该区域最优设计方案。分析表明:船体横摇及垂荡对支撑区域动力响应影响较大;相较船体静止,横摇、垂荡耦合运动使吊装绳索张力与支撑区域关键节点应力增幅均超过20%;对比初始方案支撑结构的钢材用量,最优方案可节省12.30%。将虚拟样机技术与有限元力学分析结合并融入管理科学的多目标优化和多准则决策,可提高复杂多体系统的分析效率,得到科学合理的设计方案。
基金financially supported by the State Key Laboratory of Powder Metallurgy,Hunan Provincial Natural Science Foundation of China(No.2020JJ4107)the InnovationDriven Project of Central South University(No.2020CX037)+2 种基金the Postgraduate Scientific Research Innovation Project of Hunan Province(No.QL20220021)the National Natural Science Foundation of China(No.51802352)the Science and Technology Innovation Leading Project of High-Tech Industry of Hunan Province,China(No.2020GK2067)。
文摘All-solid-state lithium-sulfur(Li-S)battery is regarded as next-generation high energy density and safety battery system.The key challenge is to develop a compatible high-performance solid-state electrolyte.Herein,a two birds with one stone strategy is proposed to simultaneously enhance Li+conductivity and polysulfide adsorptivity of poly(ethylene oxide)(PEO)-based polymer electrolyte via the integration of Nb_(2)CT_(x)MXene.Moreover,the sheet size of Nb_(2)CT_(x)MXene is crucial for the enhancement of Li^(+)conductivity and polysulfide adsorptivity,attributing to the difference in a specific surface area related to the percolation effect.By tuning the sheet size of Nb_(2)CT_(x)MXene from 500-300 nm to below 100 nm,the ionic conductivity of the PEO electrolyte is increased to2.62×10^(-4)S·cm^(-1)with improved Li+transference number of 0.37 at 600C.Furthermore,theoretical calculation and X-ray photoelectron spectroscopy(XPS)conjointly prove that poly sulfides could be effectively adsorbed by Nb2CTxnanosheets via forming Nb-S bonding to inhibit their shuttle in the PEO framework.As a result,the all-solid-state Li-S cell exhibits an initial capacity of 1149 mAh·g^(-1)at 0.5C and good cycling stability with 491 mAh·g^(-1)after 200 cycles.The results demonstrate the necessity of polysulfide inhibition and the application of Nb_(2)CT_(x)MXene in PEO-based electrolytes for all-solid-state Li-S batteries.
