This paper investigates the numerical solution of the uncertain inverse heat conduction problem. Uncertainties present in the system parameters are modelled through triangular convex normalized fuzzy sets. In the solu...This paper investigates the numerical solution of the uncertain inverse heat conduction problem. Uncertainties present in the system parameters are modelled through triangular convex normalized fuzzy sets. In the solution process, double parametric forms of fuzzy numbers are used with the variational iteration method (VIM). This problem first computes the uncertain temperature distribution in the domain. Next, when the uncertain temperature measurements in the domain are known, the functions describing the uncertain temperature and heat flux on the boundary are reconstructed. Related example problems are solved using the present procedure. We have also compared the present results with those in [Inf. Sci. (2008) 178 1917] along with homotopy perturbation method (HPM) and [Int. Commun. Heat Mass Transfer (2012) 39 30] in the special cases to demonstrate the validity and applicability.展开更多
从智能效益、经济效益、绿色效益和安全效益4个维度构建了智能变电站建设项目综合效益评价指标体系。其中评价指标的属性值为包含语言变量、精确数和正态分布区间数的混合信息。在此基础上,基于直觉模糊集和组合赋权法,构建了一种面向...从智能效益、经济效益、绿色效益和安全效益4个维度构建了智能变电站建设项目综合效益评价指标体系。其中评价指标的属性值为包含语言变量、精确数和正态分布区间数的混合信息。在此基础上,基于直觉模糊集和组合赋权法,构建了一种面向混合信息的混合多准则决策模型。该模型首先用不同的转换规则将混合信息一致化为直觉模糊数的形式。然后采用基于合作博弈模型的群组决策特征根法-直觉模糊熵(group eigenvalue method intuitionistic fuzzy entropy,GEM-IFE)组合赋权法来确定指标的综合权重,并基于直觉模糊集建立了改进的逼近理想解排序方法(technique for order preference by similarity to ideal solution,TOPSIS)评价模型。最后,以10个智能变电站建设项目作为案例进行分析,并将该模型与传统的TOPSIS方法和单一赋权法进行比较。结果证明该混合多准则决策模型具有良好的鲁棒性。展开更多
以水平回转式干馏炉为研究对象,采用离散单元法(discrete element method,DEM)建立颗粒运动模型,接触模型采用Hertz无滑动接触模型,分别对在其内设置不同形式抄板(直角抄板﹑弯抄板和直抄板)的混合效果和混合规律进行了数值研究。将大...以水平回转式干馏炉为研究对象,采用离散单元法(discrete element method,DEM)建立颗粒运动模型,接触模型采用Hertz无滑动接触模型,分别对在其内设置不同形式抄板(直角抄板﹑弯抄板和直抄板)的混合效果和混合规律进行了数值研究。将大小颗粒间接触数与颗粒间接触总数之比定义为混合质量,并以此来衡量混合程度,同时分析抄板形式及转速对混合质量的影响。研究结果表明,干馏炉内设抄板时,混合趋于稳定的时间较短,抄板形式对混合质量的影响较小;随着转速的降低,混合质量曲线越平缓,波动幅度越小。研究结果对干馏炉的设计和优化具有一定的指导作用。展开更多
基金the UGC, Government of India, for financial support under the Rajiv Gandhi National Fellowship (RGNF)
文摘This paper investigates the numerical solution of the uncertain inverse heat conduction problem. Uncertainties present in the system parameters are modelled through triangular convex normalized fuzzy sets. In the solution process, double parametric forms of fuzzy numbers are used with the variational iteration method (VIM). This problem first computes the uncertain temperature distribution in the domain. Next, when the uncertain temperature measurements in the domain are known, the functions describing the uncertain temperature and heat flux on the boundary are reconstructed. Related example problems are solved using the present procedure. We have also compared the present results with those in [Inf. Sci. (2008) 178 1917] along with homotopy perturbation method (HPM) and [Int. Commun. Heat Mass Transfer (2012) 39 30] in the special cases to demonstrate the validity and applicability.
文摘从智能效益、经济效益、绿色效益和安全效益4个维度构建了智能变电站建设项目综合效益评价指标体系。其中评价指标的属性值为包含语言变量、精确数和正态分布区间数的混合信息。在此基础上,基于直觉模糊集和组合赋权法,构建了一种面向混合信息的混合多准则决策模型。该模型首先用不同的转换规则将混合信息一致化为直觉模糊数的形式。然后采用基于合作博弈模型的群组决策特征根法-直觉模糊熵(group eigenvalue method intuitionistic fuzzy entropy,GEM-IFE)组合赋权法来确定指标的综合权重,并基于直觉模糊集建立了改进的逼近理想解排序方法(technique for order preference by similarity to ideal solution,TOPSIS)评价模型。最后,以10个智能变电站建设项目作为案例进行分析,并将该模型与传统的TOPSIS方法和单一赋权法进行比较。结果证明该混合多准则决策模型具有良好的鲁棒性。
文摘以水平回转式干馏炉为研究对象,采用离散单元法(discrete element method,DEM)建立颗粒运动模型,接触模型采用Hertz无滑动接触模型,分别对在其内设置不同形式抄板(直角抄板﹑弯抄板和直抄板)的混合效果和混合规律进行了数值研究。将大小颗粒间接触数与颗粒间接触总数之比定义为混合质量,并以此来衡量混合程度,同时分析抄板形式及转速对混合质量的影响。研究结果表明,干馏炉内设抄板时,混合趋于稳定的时间较短,抄板形式对混合质量的影响较小;随着转速的降低,混合质量曲线越平缓,波动幅度越小。研究结果对干馏炉的设计和优化具有一定的指导作用。