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FY-3湿度仪 1

偏馈抛物面天线 1

初值位移调控；忆阻系统；忆导；线平衡点集 1

波纹喇叭 1

混沌系统；霍普夫分岔；共存吸引子；偏置增强；FPGA实现；声音加密 1

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Precise semi-analytical inverse kinematic solution for 7-DOF offset manipulator with arm angle optimization

《机械工程前沿（英文）》 2021年第16卷第3期页码 435-450 doi: 10.1007/s11465-021-0630-x

摘要： Seven-degree-of-freedom redundant manipulators with link offset have many advantages, including obvious geometric significance and suitability for configu-ration control. Their configuration is similar to that of the experimental module manipulator (EMM) in the Chinese Space Station Remote Manipulator System. However, finding the analytical solution of an EMM on the basis of arm angle parameterization is difficult. This study proposes a high-precision, semi-analytical inverse method for EMMs. Firstly, the analytical inverse kinematic solution is established based on joint angle parameterization. Secondly, the analytical inverse kinematic solution for a non-offset spherical–roll–spherical (SRS) redundant manipulator is derived based on arm angle parameterization. The approximate solution of the EMM is calculated in accordance with the relationship between the joint angles of the EMM and the SRS manipulator. Thirdly, the error is corrected using a numerical method through the analytical inverse solution based on joint angle parameterization. After selecting the stride and termination condition, the precise inverse solution is computed for the EMM based on arm angle parameterization. Lastly, case solutions confirm that this method has high precision, and the arm angle parameterization method is superior to the joint angle parameterization method in terms of parameter selection.

关键词： 7-DOF redundant manipulator inverse kinematics semi-analytical arm angle link offset

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Flow and heat transfer in compact offset strip fin surfaces

DONG Junqi, CHEN Jiangping, CHEN Zhijiu

《能源前沿（英文）》 2008年第2卷第3期页码 291-297 doi: 10.1007/s11708-008-0061-y

摘要： Experimental studies of air-side heat transfer and pressure drop characteristics of offset strip fins and flat tube heat exchangers were performed. A series of tests were conducted for 9 heat exchangers with different fin space, fi

关键词： different air-side transfer pressure offset

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Contact of surfaces and contact characteristics of offset surfaces

CAO Lixin, GONG Hu, LIU Jian

《机械工程前沿（英文）》 2008年第3卷第3期页码 318-324 doi: 10.1007/s11465-008-0067-5

摘要： Based on differential geometry, the contact problems of two surfaces are discussed in this paper. The relationship between the contact status of two surfaces and that of offset surfaces are also analyzed. For a 5-axis NC machining, some research such as optimization of cutter location and calculation of the geometrical cusp height are important. The research results indicate that the relative normal curvature is an important geometrical invariant for describing the contact state of two surfaces. For point contact two surfaces, the calculation equation for the second order remained error is given. For line contact two surfaces, the condition of the second order line contact is that the principal directions and curvatures of the two surfaces are the same along the contact curve. If two surfaces keep the second order line contact, their two offset surfaces will also keep the second order line contact, and their third order remained errors are also uniform with that of the two offset surfaces.

关键词： relative important geometrical relationship geometrical invariant calculation

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余弦忆导忆阻系统周期变化初值位移调控行为 Regular Papers

Mo CHEN, Xue REN, Hua-gan WU, Quan XU, Bo-cheng BAO

《信息与电子工程前沿（英文）》 2019年第20卷第12期页码 1706-1716 doi: 10.1631/FITEE.1900360

摘要：利用一种新型余弦忆导理想忆阻，构造一个四维忆阻系统。由于忆导函数特殊的非线性，忆阻系统具有沿忆阻内部状态变量坐标轴分布的线平衡点集(0, 0, 0, δ)，且平衡点集稳定性随δ变化而周期性演化。数值仿真揭示了忆阻系统非线性、一维的初值位移调控行为，它不仅可由忆阻状态初值触发，也可由其他两个系统状态初值引发。特别地，在位移调控路线上，可以观测到多种具有不同位置和拓扑结构的共存吸引子。通过PSIM电路仿真对该特殊动力学特性进行了验证。

关键词：初值位移调控；忆阻系统；忆导；线平衡点集

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风云三号微波湿度仪天线设计与分析

王宏建,李靖,刘和光,张升伟

《中国工程科学》 2009年第11卷第4期页码 39-45

摘要：

风云三号（FY-3）湿度仪天线接收各种目标的微波辐射能量，因此天线好坏对整个微波湿度仪系统性能及应用影响极大。FY-3湿度仪天线具有高增益、低噪声和高的波束效率，采用偏馈抛物面天线形式，天线频率分别达到150 GHz和183 GHz，是目前国内有效载荷的最高频率，其成功研制填补了我国航天微波遥感的空白，也使我国航天器天线技术进入一个新的领域、实现了一次较大的技术跨越。文章从天线的系统工作模式、组成、设计要点、关键技术及验证等方面阐述该天线子系统的技术设计与创新。

关键词： FY-3湿度仪偏馈抛物面天线波纹喇叭遥感

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偏置增强自主五维混沌系统动态分析、FPGA实现及加密应用 Research Articles

Sifeu TAKOUGANG KINGNI1, Karthikeyan RAJAGOPAL2, Serdar ÇIÇEK3, Ashokkumar SRINIVASAN4, Anitha KARTHIKEYAN2

《信息与电子工程前沿（英文）》 2020年第21卷第6期页码 809-962 doi: 10.1631/FITEE.1900167

摘要：通过改进著名的三维自主Liu & Chen系统，建立偏置增强的自主五维系统。找到该自主五维系统平衡点，并分析其稳定性。该系统包含霍普夫分岔、周期吸引子、准周期吸引子、单涡旋混沌吸引子、双涡旋混沌吸引子、共存吸引子、双稳现象、部分幅度控制偏置增强、逆周期倍增和间歇性混沌路径。利用现场可编程门阵列（FPGA）实现该自主五维系统，并给出相图验证数值仿真结果。由FPGA实现的混沌吸引子及共存吸引子与数值仿真的混沌吸引子性质吻合较好。最后，设计一个基于该自主五维混沌系统的声音数据加密和通信系统，通过数值示例展示其性能。

关键词：混沌系统；霍普夫分岔；共存吸引子；偏置增强；FPGA实现；声音加密

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标题作者时间类型操作

Precise semi-analytical inverse kinematic solution for 7-DOF offset manipulator with arm angle optimization

期刊论文

Flow and heat transfer in compact offset strip fin surfaces

DONG Junqi, CHEN Jiangping, CHEN Zhijiu

期刊论文

Contact of surfaces and contact characteristics of offset surfaces

CAO Lixin, GONG Hu, LIU Jian

期刊论文

余弦忆导忆阻系统周期变化初值位移调控行为