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On the general expressions of finite Hankel transform

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Science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 2125-2130页

作者： JIANG Quan 1,2 & GAO CunFa 1 1 College of Aerospace engineering,Nanjing university of Aeronautics and Astronautics,Nanjing 210016,china 2 school of Civil engineering,nantong university,nantong 226019,china College of Aerospace engineering Nanjing University of Aeronautics and Astronautics Nanjing China school of Civil engineering Nantong University Nantong China

The general expressions of finite Hankel transform are naturally deduced with the help of the property of Bessel *** equations in this paper can degenerate into three kinds of boundaries since all the coefficients in the boundary conditions are taken into *** results can be adopted in solving physics problems involving the finite Hankel transform.

关键词： hankel transform bessel function finite integral

The Study on the Microstructure and Mechanical Properties of 400MPa Grade Bar Prepared by Controlled Cooling After Finish Rolling

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Journal of Iron and Steel Research International 2011年第S1期18卷 610-614页

作者： ZHANG Jun-wei 1,DING Lei 1,XIAO Yi 2,3,HU Xiao-dong 1,HU Lin 1 (1.school of Materials and Metallurgy,university of Science and Technology Liaoning,Anshan 114051,Liaoning,china 2.Baosteel nantong Co Ltd.,nantong 226002,Jiangsu,china 3.school of electrical engineering,Anhui university of Technology,Maanshan 243002,Anhui,china) Univ Sci & Technol Liaoning Sch Met & Mat Anshan 114051 Liaoning Peoples R China Baosteel nantong Co Ltd Nantong 226002 Jiangsu Peoples R China Anhui Univ Technol Sch Elect Engn Maanshan 243002 Anhui Peoples R China

The production process of bars in Baosteel nantong *** adjusted by both decreasing heating temperature and adding controlling cooling procedure after finish rolling for upgrade of bars.A set of water cooling system was also installed behind the finishing ***-line tests were conducted,and then the microstructure and mechanical properties of the bars with HRB335 composition and φ22mm diameter were *** results showed that the microstructures of the bar cooled by water were ferrite and pearlite with grain sizes of 8.5 to 12 grades,which were finer than that of the bar without water *** the thin outer layer microstructures of the bar cooled by water were mainly tempered sorbite with small amount of tempered *** average yield strength R eL and tensile strength R m of the bars with water cooling increased 105MPa and 73MPa respectively compared with those of the bars without water *** reason of this strengthening was attributed to the synthetic role of fine grains and phase transformation and precipitation *** addition,The ration of R m /R eL could be higher than 1.25,which is the request of earthquake-proof performance for HRB400E,only when the self-tempering temperatures of the bars were higher than 640℃.

关键词： controlled cooling hot rolling bar fine grain strengthening self-tempering

Design,analysis and control of hybrid excited doubly salient stator-permanent-magnet motor

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Science china(Technological Sciences) 2010年第1期53卷 188-199页

作者： ZHU XiaoYong1,2 & CHENG Ming1 1 engineering Research Center for Motion Control of MOE,school of electrical engineering,Southeast university,Nanjing 210096,china 2 school of electrical and Information engineering,Jiangsu university,Zhenjiang 212013,china engineering Research Center for Motion Control of MOE School of Electrical Engineering Southeast University Nanjing China school of electrical and Information engineering Jiangsu University Zhenjiang China

In this paper,a new hybrid excited doubly salient stator-permanent-magnet motor is proposed,where both permanent magnets and DC field windings are located in the *** theory,the mathematical model and design method of the motor are *** corresponding output power equation and the relationship between the flux control capability and the extended speed range are deduced in *** using an efficient "one-step" three-dimensional(3D) finite element method,the electromagnetic performances are analyzed,in which the leakage flux outside the stator circumference and end-effect are taken into *** on the operation principle of the motor,the control strategy and scheme are developed and implemented *** experimental results and finite element analysis show that the proposed motor not only maintains the advantages of doubly salient permanent magnet motors,but also offers high energy efficiency over a wide speed range,which makes the motor an interesting candidate for electric vehicles.

关键词： stator permanent magnet motor hybrid excitation doubly salient finite element method flux weakening control

Robust Decentralized Sliding Mode Control for Uncertain Stochastic Systems with Time Delays

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Robust Decentralized Sliding Mode Control for Uncertain Stoc...

2011 Chinese Control and Decision Conference（CCDC）

作者： Xiaomei Zhang is with the school of Electronics and Information,nantong university,nantong 226019,china Xiaofei Qian and Guoping Lu are with the school of electrical engineering,nantong university,nantong 226019,china

This paper is concerned with the problem of robust stabilization for uncertain stochastic delay systems with interconnections via decentralized sliding mode *** less restrictive sufficient conditions for the existence of decentralized sliding surfaces are given in terms of linear matrix inequalities,by which the decentralized sliding mode controllers ensuring the reachability of the specified decentralized sliding surfaces are designed.A numerical example is included to verify the validity of the developed controller.

关键词： Sliding mode control decentralized control stochastic systems time delays

来源： cnki会议评论

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一种雾天视觉图像增强新算法

湖南科技大学学报(自然科学版) 2010年第3期25卷 85-88页

作者：曾飞南通大学电气工程学院

通过对基于移动模板的雾天图像增强算法研究,针对其难以匹配模板内景物深度突变信息问题,提出了一种基于幂函数的自适应加权部分重叠直方图均衡(POSHE)改进算法.该方法首先设定移动模板大小,利用幂函数构造相应维数的自适应权矩阵,并引... 详细信息

通过对基于移动模板的雾天图像增强算法研究,针对其难以匹配模板内景物深度突变信息问题,提出了一种基于幂函数的自适应加权部分重叠直方图均衡(POSHE)改进算法.该方法首先设定移动模板大小,利用幂函数构造相应维数的自适应权矩阵,并引入子块直方图均衡得到变换函数,最后将邻域内子块变换函数加权求和,得到当前子块的变换函数,实验结果表明,该方法能有效增强雾天图像局部纹理细节,同时抑制噪声,具有较好的通用性和实用性.

关键词：幂函数雾天图像自适应图像增强直方图均衡

基于IDL语言的医学图像处理分析系统的研发

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生物医学工程学杂志 2009年第4期26卷 725-730页

作者：汤敏南通大学电气工程学院南通226007

医学图像处理分析系统具有极大的医学研究价值和临床辅助诊断应用的前景,近年来成为研究热点之一。IDL(Interactive Data Language)交互式语言能够提供数理统计、图像处理、信息处理、图形显示等多种功能和技术,已经成为数据可视化研究... 详细信息

医学图像处理分析系统具有极大的医学研究价值和临床辅助诊断应用的前景,近年来成为研究热点之一。IDL(Interactive Data Language)交互式语言能够提供数理统计、图像处理、信息处理、图形显示等多种功能和技术,已经成为数据可视化研究与应用开发的理想工具之一。本文介绍采用模块结构设计医学图像处理分析系统的思路和方法。系统由五个功能模块——图像预处理、图像分割、图像重建、图像测量、图像管理组成。实验结果表明,该系统效果良好,处理速度达到实时性要求,并且具有广泛的适用性、友好的人机交互性、便捷的可扩展性、良好的可移植性等优点。

关键词：图像处理图像分析模块化程序设计 IDL语言医学图像

Research on dual-stator winding multi-phase high-speed induction generator with rectifier load

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Science china(Technological Sciences) 2008年第6期51卷 683-692页

作者： WANG XiangHeng1 & WU XinZhen2 1 Department of electrical engineering, Tsinghua university, Beijing 100084, china 2 Department of electrical engineering, Qingdao university, Qingdao 266071, china Department of electrical engineering Tsinghua University Beijing China Department of electrical engineering Qingdao University Qingdao China

Based on analysis and calculation of the relation between current harmonics and MMF harmonics in the dual-stator winding multi-phase high-speed induction gen-erator with a rectifier load, a new idea, which divides the generator system into two sub-systems to be analyzed individually, is presented. For the sub-system of the 12-phase power winding with a rectifier load, the loop current method is used to establish network equation set in terms of the network graph theory. The numerical stability problem is solved by alternating use of fixed time-step and varied time-step, and the voltage and current with their fundamental components of the power winding are obtained. For the other sub-system of the induction generator with dual-stator winding and solid cage rotor, the electromagnetic field analysis method and the multi-variable optimization approach are combined to get the con-trol winding current and stator frequency. Calculated results well match experiment results, indicating that the new proposed method is of effectiveness and high ac-curacy.

关键词： dual-stator winding induction generator rectifier load MMF analysis loop current method finite element method optimization approach

Stability of impulsive stochastic functional differential systems in terms of two measures via comparison approach

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Science china(Information Sciences) 2012年第6期55卷 1313-1322页

作者： YAO FengQi 1,2 & DENG FeiQi 1 1 Institute of System engineering,South china university of Technology,Guangzhou 510640,china 2 school of electrical engineering and Information,Anhui university of Technology,Maanshan 243032,china Institute of System engineering South China University of Technology Guangzhou China school of electrical engineering and Information Anhui University of Technology Maanshan China

Comparison principles for general impulsive stochastic functional differential systems are *** the comparison principles and the theory of differential inequalities,stability and instability,involving two measures,of impulsive stochastic functional differential systems are *** stability and instability criteria are obtained,and two examples are also given to illustrate our results.

关键词： stochastic systems impulsive functional differential systems comparison principle stability in terms of two measures instability

Theoretical analysis and experiment of micromechanics and mechanics-optics coupling of distributed optic-fiber crack sensing

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中国科学：技术科学英文版 2011年第S1期54卷 185-191页

作者： LIU HaoWu 1,2,CHEN Jiang 2,SUN Man 3 & DING Rui 2 1 State Key Laboratory of Hydraulics and Mountain River engineering,Sichuan university,Chengdu 610065,china 2 school of Water Resource Hydropower,Sichuan university,Chengdu 610065,china 3 school electrical engineering and Information,Sichuan university,Chengdu 610065,china State Key Laboratory of Hydraulics and Mountain River engineering Sichuan University Chengdu China school of Water Resource Hydropower Sichuan University Chengdu China school electrical engineering and Information Sichuan University Chengdu China

The micromechanical behaviors and mechanics-optics coupling effects of optic-fiber-concrete complex in the distributed optic-fiber sensing concrete-crack technology,which was used in health monitoring of Wu Gorge Bridge on Yangtze River and a large dam successfully,have been investigated.A micromechanical theoretical analysis method and micromechanical frictional contact bi-interface model,as well as a modified optical theoretical analysis method of the mechanics-optics coupling effects are presented.A series of verification experiments,including mechanical experiments and mechanics-optics coupling experiments,have been *** results of micromechanical theoretical analysis and the analysis of the modified theory of mechanics-optics coupling along with mechanical and optical experimental data are shown to be in close *** the micromechanical theory and the modified theory of mechanics-optics coupling with their analysis methods can not only enhance credibility of this novel distributed sensing technology but also provide a way to understand its sensing mechanism and optimize its technical details and system.

关键词： optic-fiber sensing mechanics-optics coupling micromechanics health monitoring concrete structure crack detection