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求解无阻尼Duffing方程的三角拟合显式对称六步法
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作者 房永磊 郭娟 《枣庄学院学报》 2016年第5期9-14,共6页
本文利用多频三角拟合多步法求解无阻尼Duffing方程,构造包含不同共振谱的四种三角拟合对称六步法,分析新方法的稳定性和相性质.数值实验的结果显示新方法的有效性.
关键词 显式对称方法 多频问题 相分析
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阶跃折射率波导上多频逆源问题的因式分解法
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作者 陈容 刘立汉 郑秋燕 《重庆师范大学学报(自然科学版)》 CAS 北大核心 2022年第2期89-95,共7页
【目的】研究阶跃折射率波导上的多频逆源问题。【方法】通过远场数据可以唯一确定在观测方向具有法线的凸多边形的并集,它近似于源的位置和形状。【结果】在未知源满足强制假设条件下,利用因式分解法的思想来反演未知源的位置和形状。... 【目的】研究阶跃折射率波导上的多频逆源问题。【方法】通过远场数据可以唯一确定在观测方向具有法线的凸多边形的并集,它近似于源的位置和形状。【结果】在未知源满足强制假设条件下,利用因式分解法的思想来反演未知源的位置和形状。【结论】提出的方法对重构过程的数值实现进行了严格论证,并提供了数值例子说明这一方法的有效性与可行性。 展开更多
关键词 多频逆源问题 因式分解法 凸多边形
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Method for optimizing manipulator's geometrical parameters and selecting reducers 被引量:4
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作者 杜志江 肖永强 董为 《Journal of Central South University》 SCIE EI CAS 2013年第5期1235-1244,共10页
A geometrical parameters optimization and reducers selection method was proposed for robotic manipulators design. The Lagrangian approach was employed in deriving the dynamic model of a two-DOF manipulator. The flexib... A geometrical parameters optimization and reducers selection method was proposed for robotic manipulators design. The Lagrangian approach was employed in deriving the dynamic model of a two-DOF manipulator. The flexibility of links and joints was taken into account in the mechanical structure dimensions optimization and reducers selection, in which Timoshenko model was used to discretize the hollow links. Two criteria, i.e. maximization of fundamental frequency and minimization of self-mass/load ratio, were utilized to optimize the manipulators. The NSGA-II (fast elitist nondominated sorting genetic algorithms) was employed to solve the multi-objective optimization problem. How the joints flexibility affects the manipulators design was analyzed and shown in the numerical analysis example. The results indicate that simultaneous consideration of the joints and the links flexibility is very necessary for manipulators optimal design. Finally, several optimal combinations were provided. The effectiveness of the optimization method was proved by comparing with ADAMS simulation results. The self-mass/load ratio error of the two methods is within 10%. The maximum error of the natural frequency by the two methods is 23.74%. The method proposed in this work provides a fast and effective pathway for manipulator design and reducers selection. 展开更多
关键词 robotic manipulator optimal design reducer selection flexible links flexible joints
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Dynamical Consensus Algorithm for Second-Order Multi-Agent Systems Subjected to Communication Delay 被引量:1
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作者 刘成林 刘飞 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第6期773-781,共9页
To solve the dynamical consensus problem of second-order multi-agent systems with communication delay,delay-dependent compensations are added into the normal asynchronously-coupled consensus algorithm so as to make th... To solve the dynamical consensus problem of second-order multi-agent systems with communication delay,delay-dependent compensations are added into the normal asynchronously-coupled consensus algorithm so as to make the agents achieve a dynamical consensus. Based on frequency-domain analysis, sufficient conditions are gained for second-order multi-agent systems with communication delay under leaderless and leader-following consensus algorithms respectively. Simulation illustrates the correctness of the results. 展开更多
关键词 dynamical consensus second-order multi-agent systems communication delay delay-dependentcompensation
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A novel resource optimization scheme for multi-cell OFDMA relay network 被引量:1
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作者 Ning DU Fa-sheng LIU 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2016年第8期825-833,共9页
In cellular networks, users communicate with each other through their respective base stations(BSs).Conventionally, users are assumed to be in different cells. BSs serve as decode-and-forward(DF) relay nodes to us... In cellular networks, users communicate with each other through their respective base stations(BSs).Conventionally, users are assumed to be in different cells. BSs serve as decode-and-forward(DF) relay nodes to users.In addition to this type of conventional user, we recognize that there are scenarios users who want to communicate with each other are located in the same cell. This gives rise to the scenario of intra-cell communication. In this case, a BS can behave as a two-way relay to achieve information exchange instead of using conventional DF relay.We consider a multi-cell orthogonal frequency division multiple access(OFDMA) network that comprises these two types of users. We are interested in resource allocation between them. Specifically, we jointly optimize subcarrier assignment, subcarrier pairing, and power allocation to maximize the weighted sum rate. We consider the resource allocation problem at BSs when the end users' power is fixed. We solve the problem approximately through Lagrange dual decomposition. Simulation results show that the proposed schemes outperform other existing schemes. 展开更多
关键词 Intra-cell communication Two-way relay Subcarrier assignment Subcarrier pairing
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