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防空模拟训练系统中空袭模块的实现与分析

系统仿真学报 2002年第7期14卷 898-900,918页

作者：陆波华祖耀国防科学技术大学机电工程与自动化学院长沙410073

由于客观条件的限制,用真实装备进行操作训练花费巨大而且适用范围有限,运用模拟训练系统能高效地完成武器装备操作训练任务。提供逼真的空袭实体和对现代战场必然存在的电子对抗进行仿真是防空模拟训练的重要环节。论文以我们研制的陆... 详细信息

由于客观条件的限制,用真实装备进行操作训练花费巨大而且适用范围有限,运用模拟训练系统能高效地完成武器装备操作训练任务。提供逼真的空袭实体和对现代战场必然存在的电子对抗进行仿真是防空模拟训练的重要环节。论文以我们研制的陆军防空模拟训练系统为背景,较详细地介绍了其中空袭目标模拟模块的系统构成及信息交互机制、借助3DEM的地形环境生成技术、空袭兵器行为控制和空袭航路仿真及电子对抗仿真的建模思想和实现技术。

关键词：防空模拟训练系统空袭模块分析计算机辅助训练计算机生成兵力分布交互仿真虚拟现实

Frequency Modulation of High-Speed Mill Chatter

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Frequency Modulation of High-Speed Mill Chatter

第十届国际制造工程与管理会议

作者： WU Yun-xin DUAN Ji-an(college of mechanical-Electrical engineering Central-South university changsha 410083 china)

＜正＞ Mill chatter is a common phenomenon in the metal strip rolling process. Product defects caused by mill vibration were reported worldwide during last two decades, which is usually classified as torque vibration of the driving system with low frequencies and vertical vibration of the mill stand with comparative higher frequencies. The frequency range of the vertical vibration is wide （in general from more than 100 Hz to more than 1 000 Hz）, and the vibration phenomena are very complex, even it is very difficult to determine the vibration causes, which is followed the name "ghost vibration". During a fieldwork to measure the vibration in high-speed rolling mills, a frequency modulation phenomenon was identified, which had not been reported in strip rolling community. This article makes a theoretical investigation to the newly encountered phenomenon in strip rolling process. According to an analysis of the mill roller bearings, the periodic change of stiffness of roller bearings at the fixed load orientation, together with the periodic change of the effective errors of the bearings, may cause amplitude and frequency modulation,based on the theories of Fourier series and Bessel function. The comparison between test results and theoretical analysis implies that the frequency modulation is caused by the effective errors of the mill roller bearings that have 12 ripples on the internal ring of the bearings.

关键词： rolling mill chatter frequency modulation

The Research of New Hydraulic Breaker with Gas and Oil Unite Work

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The Research of New Hydraulic Breaker with Gas and Oil Unite...

2007工程机械与车辆工程新进展国际学术会议

作者： Zhao Hongqiang~(1 2) Gao Bin~1 Li Meixiang~1 He Qinghua~(1 2) 1.college of mechanical and Electrical engineering Central South university 410083 changsha hunan P.R.china 2.Sunward R&D Center 410100 Xingsha changsha hunan P.R.china

＜正＞This paper validate the truth of the pressure feedback working principle of a new hydraulic breaker by experiment,and test the relationship between its working capability and performance parameters with working parameters. The stepless adjustment and control of the impact power of the breaker can be achieved by the stepless adjustment and control of the working pressure of the impact *** addition,the stepless adjustment and control of the impact frequency of hydraulic breaker can be achieved by the stepless adjustment and control of the flux-out of the oil feed *** hydraulic breaker based on above principles has merits of high efficiency,working stability and reliability and also has excellent performance.

关键词： Independent stepless adjustment and control Impact power Impact frequency Pressure feedback.

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列车气动试验数据场插值方法研究

铁道学报 2004年第5期26卷 46-49页

作者：江帆田红旗何华陈维平华南理工大学机械工程学院广东广州510640 中南大学高速列车研究中心湖南长沙410075

试验数据场插值方法是列车气动试验数据可视化研究的重要内容之一,本文根据列车气动试验数据场的特点,在深入探讨试验数据场四边形网格划分算法和等参变换的区域映射插值算法的基础上,提出了数据场网格划分和区域映射相结合的插值方法... 详细信息

试验数据场插值方法是列车气动试验数据可视化研究的重要内容之一,本文根据列车气动试验数据场的特点,在深入探讨试验数据场四边形网格划分算法和等参变换的区域映射插值算法的基础上,提出了数据场网格划分和区域映射相结合的插值方法。这种插值算法对分布于列车自由表面的曲面域气动试验数据场插值很有效,具有插值精度较高、算法简单、容易编程等优点,将这种方法应用到列车气动试验数据可视化系统中,进一步证实了该方法所具有的优越性。

关键词：列车气动试验四边形网格剖分等参变换区域映射数据场插值

A New Method for Forecasting the Life Test Data of mechanical Products

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International Journal of Plant engineering and Management 2001年第2期6卷 57-64页

作者： ZHANG Huai-liang, TAN Guanjun, QIU Xian-yan college of mechanical and Electrical engineering Central South university changsha 410083, P R. china college of mechanical and Electrical engineering Central South UniversityChangsha 410083 P. R. China

The model for forecasting the test data on mechanical products is established in the application of the grey system theories. A new formula of the background value is introduced into the model. The result of an exampl... 详细信息

关键词： mechanical product life test data forecast grey system theory

Fuzzy Neural Networks Control for Hydraulic AGC System of Aluminum Cold Rolling Mill

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Fuzzy Neural Networks Control for Hydraulic AGC System of Al...

2008 3rd International Conference on Intelligent System and Knowledge engineering(ISKE 2008)

作者： Yang Yong 1 2 Zhang Xinming 1 1.college of Materials Science and engineering Central South Univ. changsha 410083 china 2.college of mechanical and Electrical engineering Guangdong Polytechnic Normal university Guangzhou 510665 china

The hydraulic AGC system of aluminum cold rolling mill is directly related to the quality and effectiveness of cold rolling aluminum sheet strips. Traditional PID control becomes difficult to satisfy the necessity of improving the control performance of cold rolling mill. High precision, simple and effective control strategies are very important for the hydraulic AGC system of cold rolling mill. For the complex control problems, it is also desirable to integrate neural networks into fuzzy control so as to simplify and automate the specification of linguistic rules. This leads to good adaptation, good robustness and less dependency on the precise model of the control system. In the paper, a fuzzy neural networks control has been developed and applied to the screw-down mechanism control of hydraulic AGC system of cold rolling mill. The simulation experiment results verify the superiority of the proposed compound control to the conventional PID control in the static and dynamic control performance. The merits of both fuzzy control and artificial neural networks are well used in the hydraulic AGC system of aluminum cold rolling mill.

关键词：

Frequency Modulation of High-Speed Mill Chatter

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厦门大学学报（自然科学版） 2002年第S1期41卷 5-页

作者： WU Yun-xin, DUAN Ji-an (college of mechanical-Electrical engineering, Central-South university, changsha 410083, china)

Mill chatter is a common phenomenon in the metal strip rolling process. Product defects caused by mill vibration were reported worldwide during last two decades, which is usually classified as torque vibration of the driving system with low frequencies and vertical vibration of the mill stand with comparative higher frequencies. The frequency range of the vertical vibration is wide (in general from more than 100 Hz to more than 1 000 Hz), and the vibration phenomena are very complex, even it is very difficult to determine the vibration causes, which is followed the name "ghost vibration". During a fieldwork to measure the vibration in high-speed rolling mills, a frequency modulation phenomenon was identified, which had not been reported in strip rolling community. This article makes a theoretical investigation to the newly encountered phenomenon in strip rolling process. According to an analysis of the mill roller bearings, the periodic change of stiffness of roller bearings at the fixed load orientation, together with the periodic change of the effective errors of the bearings, may cause amplitude and frequency modulation,based on the theories of Fourier series and Bessel function. The comparison between test results and theoretical analysis implies that the frequency modulation is caused by the effective errors of the mill roller bearings that have 12 ripples on the internal ring of the bearings.

关键词： rolling mill chatter frequency modulation

Neural Networks Predictive Control Using AEPSO

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Neural Networks Predictive Control Using AEPSO

第二十七届中国控制会议

作者： Hou Zhixiang,Chen Hui,Li Heqing college of Automobile and mechanical engineering,changsha university of Science and Technology,changsha 410076,P.R.china

In order to improve the global convergence of the basic particle swarm optimization,an adaptive expanded particle swarm optimization method was provided in this paper firstly,where particle is refreshed by multi-particle strategy;at the same time,the parameter c0 is self-adaptively *** improved PSO was used as the optimizer of the neural network predictive control and optimized the control serial in the finite time *** stability of predictive control of neural network using improved PSO as optimizer is *** results show that the method has better track performance.

关键词： Predictive control Neural networks PSO Stability

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隧道凿岩机器人的车体定位方法

同济大学学报（自然科学版） 2001年第9期29卷 1032-1035页

作者：谢习华何清华周亮中南大学机电工程学院湖南长沙410083

讨论了国内自行研制的隧道凿岩机器人利用安装在隧道壁上的激光 ,使钻臂上的两个激光靶与激光对准 ,采集各关节传感器的值并做数据处理 ,能得到精确的车体到隧道断面的坐标变换矩阵 ,实现车体的精确定位 .同时根据推导公式的特例。

关键词：隧道凿岩机器人凿岩台车主体定位坐标变换激光定位关节传感器