Region partition(RP) is the key technique to the finite element parallel computing(FEPC),and its performance has a decisive influence on the entire process of analysis and computation.The performance evaluation index ...Region partition(RP) is the key technique to the finite element parallel computing(FEPC),and its performance has a decisive influence on the entire process of analysis and computation.The performance evaluation index of RP method for the three-dimensional finite element model(FEM) has been given.By taking the electric field of aluminum reduction cell(ARC) as the research object,the performance of two classical RP methods,which are Al-NASRA and NGUYEN partition(ANP) algorithm and the multi-level partition(MLP) method,has been analyzed and compared.The comparison results indicate a sound performance of ANP algorithm,but to large-scale models,the computing time of ANP algorithm increases notably.This is because the ANP algorithm determines only one node based on the minimum weight and just adds the elements connected to the node into the sub-region during each iteration.To obtain the satisfied speed and the precision,an improved dynamic self-adaptive ANP(DSA-ANP) algorithm has been proposed.With consideration of model scale,complexity and sub-RP stage,the improved algorithm adaptively determines the number of nodes and selects those nodes with small enough weight,and then dynamically adds these connected elements.The proposed algorithm has been applied to the finite element analysis(FEA) of the electric field simulation of ARC.Compared with the traditional ANP algorithm,the computational efficiency of the proposed algorithm has been shortened approximately from 260 s to 13 s.This proves the superiority of the improved algorithm on computing time performance.展开更多
不同于飞机进场和起飞时噪声的测量点位置基本固定,在实际噪声测量过程中,边线噪声测量点的位置无法固定,使得边线噪声级难以准确测量。而利用美国汽车工程师学会(Society of Automotive Engineers,SAE)提供的飞机噪声与性能数据库(Airc...不同于飞机进场和起飞时噪声的测量点位置基本固定,在实际噪声测量过程中,边线噪声测量点的位置无法固定,使得边线噪声级难以准确测量。而利用美国汽车工程师学会(Society of Automotive Engineers,SAE)提供的飞机噪声与性能数据库(Aircraft Noise and Performance,ANP),可以计算出不同飞机起飞过程中的边线噪声有效感觉噪声级。其中包括计算起飞剖面航迹,利用噪声-功率距离(Noise-Power-Distance,NPD)数据插值计算,确定噪声级修正参数等内容。通过得出的不同机型在标准状态下的边线噪声数据,可以进一步判定边线噪声测量点的摆放位置,从而使得在实际测量过程中可以得到更准确的噪声数据。这不仅对同类型飞机的边线噪声预测起到一定的帮助作用,还可以缩短新飞机噪声的合格审定周期。展开更多
大型铝电解槽的数值仿真采用有限元分析方法,伴随着有限元模型的大型化、精细化,其对有限元计算速度提出了更高的要求。为此,本文将并行计算应用于铝电解槽电场仿真计算中,针对决定并行计算效率的区域划分环节,结合铝电解槽模型特点引入...大型铝电解槽的数值仿真采用有限元分析方法,伴随着有限元模型的大型化、精细化,其对有限元计算速度提出了更高的要求。为此,本文将并行计算应用于铝电解槽电场仿真计算中,针对决定并行计算效率的区域划分环节,结合铝电解槽模型特点引入ANP(Al-NASRA and NGUYEN)算法,并和常用的多层次方法进行比较。数值分析结果表明:基于ANP算法的有限元并行计算方法在面对铝电解槽这类复杂三维模型时能够取得良好的划分结果,进而得到较优的并行计算加速比。展开更多
基金Project(61273187)supported by the National Natural Science Foundation of ChinaProject(61321003)supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China
文摘Region partition(RP) is the key technique to the finite element parallel computing(FEPC),and its performance has a decisive influence on the entire process of analysis and computation.The performance evaluation index of RP method for the three-dimensional finite element model(FEM) has been given.By taking the electric field of aluminum reduction cell(ARC) as the research object,the performance of two classical RP methods,which are Al-NASRA and NGUYEN partition(ANP) algorithm and the multi-level partition(MLP) method,has been analyzed and compared.The comparison results indicate a sound performance of ANP algorithm,but to large-scale models,the computing time of ANP algorithm increases notably.This is because the ANP algorithm determines only one node based on the minimum weight and just adds the elements connected to the node into the sub-region during each iteration.To obtain the satisfied speed and the precision,an improved dynamic self-adaptive ANP(DSA-ANP) algorithm has been proposed.With consideration of model scale,complexity and sub-RP stage,the improved algorithm adaptively determines the number of nodes and selects those nodes with small enough weight,and then dynamically adds these connected elements.The proposed algorithm has been applied to the finite element analysis(FEA) of the electric field simulation of ARC.Compared with the traditional ANP algorithm,the computational efficiency of the proposed algorithm has been shortened approximately from 260 s to 13 s.This proves the superiority of the improved algorithm on computing time performance.
文摘不同于飞机进场和起飞时噪声的测量点位置基本固定,在实际噪声测量过程中,边线噪声测量点的位置无法固定,使得边线噪声级难以准确测量。而利用美国汽车工程师学会(Society of Automotive Engineers,SAE)提供的飞机噪声与性能数据库(Aircraft Noise and Performance,ANP),可以计算出不同飞机起飞过程中的边线噪声有效感觉噪声级。其中包括计算起飞剖面航迹,利用噪声-功率距离(Noise-Power-Distance,NPD)数据插值计算,确定噪声级修正参数等内容。通过得出的不同机型在标准状态下的边线噪声数据,可以进一步判定边线噪声测量点的摆放位置,从而使得在实际测量过程中可以得到更准确的噪声数据。这不仅对同类型飞机的边线噪声预测起到一定的帮助作用,还可以缩短新飞机噪声的合格审定周期。
文摘大型铝电解槽的数值仿真采用有限元分析方法,伴随着有限元模型的大型化、精细化,其对有限元计算速度提出了更高的要求。为此,本文将并行计算应用于铝电解槽电场仿真计算中,针对决定并行计算效率的区域划分环节,结合铝电解槽模型特点引入ANP(Al-NASRA and NGUYEN)算法,并和常用的多层次方法进行比较。数值分析结果表明:基于ANP算法的有限元并行计算方法在面对铝电解槽这类复杂三维模型时能够取得良好的划分结果,进而得到较优的并行计算加速比。
