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计算电磁学研究进展 被引量:23
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作者 洪伟 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2002年第3期335-339,共5页
介绍了东南大学计算电磁学研究中心近年来在计算电磁学方面的研究进展 .包括吸收边界条件、区域分裂法、不变性测试方程法、Green函数、电磁成像、直线法、泛函方法。
关键词 计算 电磁场 边值问题 数值分析 区域分裂法 有限差分法 直线法
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Pole assignment in descriptor periodic systems
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作者 FAN Hung-Yuan~1 LIN Wen-Wei~1 & XU Shufang~2 1. Department of Mathematics,Tsing Hua University,Hsinchu 30043,China 2. LMAM,School of Mathematical Sciences,Peking University,Beijing 100871,China 《Science China Mathematics》 SCIE 2005年第10期1309-1332,共24页
In this paper a pole assignment problem is considered for the descriptor linear discrete-time periodic systems, which is using the periodic proportional-derivative feedback to modify a given system such that the close... In this paper a pole assignment problem is considered for the descriptor linear discrete-time periodic systems, which is using the periodic proportional-derivative feedback to modify a given system such that the closed loop system has a specified selfconjugate set of eigenvalues. It is shown that the complete reachability of an open loop periodic system is equivalent to the possibility of assigning an arbitrary set of the eigenvalues to the system by choosing the suitable periodic proportional-derivative feedback.A computational approach is also proposed to solve the problem, which uses the reliable numerical techniques based on the orthogonal transformations. Numerical examples are presented to illustrate the effectiveness of the proposed approach. 展开更多
关键词 DESCRIPTOR linear PERIODIC system pole assignment proportional and DERIVATIVE feedback numerical method PERIODIC schur decomposition.
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A new algorithm for pole assignment of single-input linear systems using state feedback
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作者 QIAN Jiang CHENG Mingsong XU Shufang 《Science China Mathematics》 SCIE 2005年第3期307-321,共15页
In this paper we present a new algorithm for the single-input pole assignment problem using state feedback. This algorithm is based on the Schur decomposition of the closed-loop system matrix, and the numerically stab... In this paper we present a new algorithm for the single-input pole assignment problem using state feedback. This algorithm is based on the Schur decomposition of the closed-loop system matrix, and the numerically stable unitary transformations are used whenever possible, and hence it is numerically reliable.The good numerical behavior of this algorithm is also illustrated by numerical examples. 展开更多
关键词 pole assignment problem numerical method schur decomposition.
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