Based on CORBA (Common Object Request Broker Architect ) and Java techniques, a concrete solution to creating a parallel distributed FEM computing circumstance (PDFCC) on the platform of heterogeneous networks support...Based on CORBA (Common Object Request Broker Architect ) and Java techniques, a concrete solution to creating a parallel distributed FEM computing circumstance (PDFCC) on the platform of heterogeneous networks supporting TGP/IP protocol is proposed. In order to verify the feasibility of this solution, the basic frame of PDFCC has been implemented and tested on LAN (Local Area Network).展开更多
Quartz crystal resonators are typical piezoelectric acoustic wave devices for frequency control applications with mechanical vibration frequency at the radio-frequency （RF） range. Precise analyses of the vibration a...Quartz crystal resonators are typical piezoelectric acoustic wave devices for frequency control applications with mechanical vibration frequency at the radio-frequency （RF） range. Precise analyses of the vibration and deformation are generally required in the resonator design and improvement process. The considerations include the presence of electrodes, mountings, bias fields such as temperature, initial stresses, and acceleration. Naturally, the finite element method is the only effective tool for such a coupled problem with multi-physics nature. The main challenge is the extremely large size of resulted linear equations. For this reason, we have been employing the Mindlin plate equations to reduce the computational difficulty. In addition, we have to utilize the parallel computing techniques on Linux clusters, which are widely available for academic and industrial applications nowadays, to improve the computing efficiency. The general principle of our research is to use open source software components and public domain technology to reduce cost for developers and users on a Linux cluster. We start with a mesh generator specifically for quartz crystal resonators of rectangular and circular types, and the Mindlin plate equations are implemented for the finite element analysis. Computing techniques like parallel processing, sparse matrix handling, and the latest eigenvalue extraction package are integrated into the program. It is clear from our computation that the combination of these algorithms and methods on a cluster can meet the memory requirement and reduce computing time significantly.展开更多
A new Graphics Processing Unit(GPU) parallelization strategy is proposed to accelerate sparse finite element computation for three dimensional electromagnetic analysis.The parallelization strategy is employed based on...A new Graphics Processing Unit(GPU) parallelization strategy is proposed to accelerate sparse finite element computation for three dimensional electromagnetic analysis.The parallelization strategy is employed based on a new compression format called sliced ELL Four(sliced ELL-F).The sliced ELL-F format-based parallelization strategy is designed for hastening many addition,dot product,and Sparse Matrix Vector Product(SMVP) operations in the Conjugate Gradient Norm(CGN) calculation of finite element equations.The new implementation of SMVP on GPUs is evaluated.The proposed strategy executed on a GPU can efficiently solve sparse finite element equations,espe-cially when the equations are huge sparse(size of most rows in a coefficient matrix is less than 8).Numerical results show the sliced ELL-F format-based parallelization strategy can reach signi?cant speedups compared to Compressed Sparse Row(CSR) format.展开更多
为提高传输线有限元法(transmission line model-finite element method,TLM-FEM)的求解效率,对该方法的入射阶段和反射阶段的求解过程进行了优化。在反射阶段采用优化的松弛方法加速求解非线性端口电压,将单元系数矩阵的计算以及全局...为提高传输线有限元法(transmission line model-finite element method,TLM-FEM)的求解效率,对该方法的入射阶段和反射阶段的求解过程进行了优化。在反射阶段采用优化的松弛方法加速求解非线性端口电压,将单元系数矩阵的计算以及全局矩阵的分解在GPU上并行实现进一步提升计算效率。将优化的TLM-FEM用于单相变压器电磁场的计算中,通过C++自编程分析与商用软件ANSYS的求解结果进行对比,验证了算法的准确性。对同一模型不同网格数量的计算时间进行对比,可知提出的方法可用于大型电气设备电磁场分析。展开更多
文摘Based on CORBA (Common Object Request Broker Architect ) and Java techniques, a concrete solution to creating a parallel distributed FEM computing circumstance (PDFCC) on the platform of heterogeneous networks supporting TGP/IP protocol is proposed. In order to verify the feasibility of this solution, the basic frame of PDFCC has been implemented and tested on LAN (Local Area Network).
基金supported by a grant from the Science and Technology Division,Zhejiang Provincial Government,under the Key Project of the International Collaborative Program(Grant No.2006C14021)Additional support is from the K.C. Wong Magna Fund of Ningbo University.
文摘Quartz crystal resonators are typical piezoelectric acoustic wave devices for frequency control applications with mechanical vibration frequency at the radio-frequency （RF） range. Precise analyses of the vibration and deformation are generally required in the resonator design and improvement process. The considerations include the presence of electrodes, mountings, bias fields such as temperature, initial stresses, and acceleration. Naturally, the finite element method is the only effective tool for such a coupled problem with multi-physics nature. The main challenge is the extremely large size of resulted linear equations. For this reason, we have been employing the Mindlin plate equations to reduce the computational difficulty. In addition, we have to utilize the parallel computing techniques on Linux clusters, which are widely available for academic and industrial applications nowadays, to improve the computing efficiency. The general principle of our research is to use open source software components and public domain technology to reduce cost for developers and users on a Linux cluster. We start with a mesh generator specifically for quartz crystal resonators of rectangular and circular types, and the Mindlin plate equations are implemented for the finite element analysis. Computing techniques like parallel processing, sparse matrix handling, and the latest eigenvalue extraction package are integrated into the program. It is clear from our computation that the combination of these algorithms and methods on a cluster can meet the memory requirement and reduce computing time significantly.
基金Supported by the National Natural Science Foundation of China (No. 60801039)
文摘A new Graphics Processing Unit(GPU) parallelization strategy is proposed to accelerate sparse finite element computation for three dimensional electromagnetic analysis.The parallelization strategy is employed based on a new compression format called sliced ELL Four(sliced ELL-F).The sliced ELL-F format-based parallelization strategy is designed for hastening many addition,dot product,and Sparse Matrix Vector Product(SMVP) operations in the Conjugate Gradient Norm(CGN) calculation of finite element equations.The new implementation of SMVP on GPUs is evaluated.The proposed strategy executed on a GPU can efficiently solve sparse finite element equations,espe-cially when the equations are huge sparse(size of most rows in a coefficient matrix is less than 8).Numerical results show the sliced ELL-F format-based parallelization strategy can reach signi?cant speedups compared to Compressed Sparse Row(CSR) format.
文摘为提高传输线有限元法(transmission line model-finite element method,TLM-FEM)的求解效率,对该方法的入射阶段和反射阶段的求解过程进行了优化。在反射阶段采用优化的松弛方法加速求解非线性端口电压,将单元系数矩阵的计算以及全局矩阵的分解在GPU上并行实现进一步提升计算效率。将优化的TLM-FEM用于单相变压器电磁场的计算中,通过C++自编程分析与商用软件ANSYS的求解结果进行对比,验证了算法的准确性。对同一模型不同网格数量的计算时间进行对比,可知提出的方法可用于大型电气设备电磁场分析。
