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FLIGHT CONFLICT FO RECASTING BASED ON CHAOTIC TIME SERIES 被引量:13
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作者 李善梅 徐肖豪 孟令航 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2012年第4期388-394,共7页
In order to grasp the evolution of flight conflict amount accurately and to forecast the amount, chaos in flight conflicts is studied. Firstly, a fault tree of flight conflicts is established based on the man-machine-... In order to grasp the evolution of flight conflict amount accurately and to forecast the amount, chaos in flight conflicts is studied. Firstly, a fault tree of flight conflicts is established based on the man-machine-environ- ment system engineering theory. The chaotic characteristics of flight conflict are analyzed from the qualitative point of view. Secondly, an improved chaotic algorithm for the largest Lyapunov exponent is proposed based on the small-data method and the wavelet de-noising theory. Chaos in flight conflict time series is identified by the improved chaotic algorithm from the quantitative point of view. Finally, a case study by the chaos forecasting al- gorithm is performed and the results are evaluated by the gray error checking : Correlative value of posterior error is 0. 220 9〈0. 35, and micro-error probability is 0. 985 3〉0.95. Such results show the chaos forecasting algo- rithm is effective, thus it is feasible to analyze and forecast flight conflict by chaotic theory. 展开更多
关键词 flight conflict system engineering theory chaos theory fault tree Lyapunov exponent
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INVESTIGATION IN REDUCING EXHAUST EMISSIONS FROM TWO STROKE MOTORCYCLES 被引量:1
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作者 王颂秦 白景升 林漫群 《Transactions of Tianjin University》 EI CAS 1998年第1期3-8,共6页
Test results of reducing two stroke motorcycle emissions with new type carburettors and electronic fuel injection systems are presented. Analyses and comparison between different systems are discussed. The adoption o... Test results of reducing two stroke motorcycle emissions with new type carburettors and electronic fuel injection systems are presented. Analyses and comparison between different systems are discussed. The adoption of electronically controlled injection and corresponding electronic control technique is an effective measure of prolonged vitality to improve emissions from two stroke motorcycles. Suggestions about the strategic steps of China′s motorcycle emission control are proposed. 展开更多
关键词 two stroke motorcycle engine carburettor electronic control injection system controlled stratified combustion emission test for exhaust emission from motorcycle
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上海善能机械有限公司——节省每孔珩磨费用的善能SV-200立式珩磨机
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《机械》 2005年第4期49-49,共1页
关键词 上海善能机械有限公司 SV-200 立式珩磨机 冲程系统
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KY—30数控液压冲模回转头压力机
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《机械工人(热加工)》 2003年第6期31-31,共1页
关键词 数控液压冲模回转头压力机 上海第二锻压机床厂 数控冲床 液压可变冲程系统
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Permanence and Periodic Solution of an Impulsive Delay Two-prey One-predator System with Variable Coefficients 被引量:1
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作者 LIU Yan-wei LU Kai-zhang 《Chinese Quarterly Journal of Mathematics》 CSCD 2009年第2期267-273,共7页
two-prey one-predator system with a special Holling-Ⅱ functional response is discussed. That w-periodic solution of the predator extinction is global asymptotically stable is proved by some new methods. Furthermore, ... two-prey one-predator system with a special Holling-Ⅱ functional response is discussed. That w-periodic solution of the predator extinction is global asymptotically stable is proved by some new methods. Furthermore, by the comparison theorem of impulsive differential equation, the sufficient conditions are derived for the permanence and the existence of periodic solution of the system. 展开更多
关键词 IMPULSIVE DELAY comparison principle variable coefficients
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Dual cycloid gear mechanism for automobile safety pretensioners 被引量:3
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作者 SHIN Joong-ho KIM Chang-hyun +1 位作者 YUN Pyeong-hwa KWON Soon-man 《Journal of Central South University》 SCIE EI CAS 2012年第2期365-373,共9页
The most conventional vehicle pretensioner system consists of an internal gear pair with involute teeth. However, it has been well known that the corresponding gear pairs are relatively weak under the situation of imp... The most conventional vehicle pretensioner system consists of an internal gear pair with involute teeth. However, it has been well known that the corresponding gear pairs are relatively weak under the situation of impact loadings. To improve this phenomenon, a new pretensioning gear system with cycloid teeth rather than the involute ones was proposed, and dual cycloidal gear mechanisms were designed for satisfying geometric constraints and dynamic loading conditions. The simulations of the prototypes were conducted by LS-DYNA program and the experiments for a prototype were performed for a dynamic model with impact loading devices. The results show that the better operation and the smoother motion are confirmed in the proposed cycloidal gear system rather than the conventional one without interferences between gear teeth under the impact of a crash. 展开更多
关键词 seat belt pretensioner internal gear pairs involute gear dual cycloid gear
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Exact Solutions to Short Pulse Equation
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作者 FU Zun-Tao ZHENG Ming-Hua LIU Shi-Kuo 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第3期395-396,共2页
In this paper, dependent and independent variable transformations are introduced to solve the short pulse equation. It is shown that different kinds of solutions can be obtained to the short pulse equation.
关键词 Jacobian elliptic function the short pulse equation TRANSFORMATION
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Prediction of Pulsation Frequency of Pulsing Flow in Trickle Beds Based on Artificial Neural Network
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作者 刘国柱 米镇涛 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第4期582-585,共4页
An extensive database (946 measurements) for the frequency of pulsing flow in trickle beds was established by collecting the experimental results published over past 30 years. A new correlation based on artificial neu... An extensive database (946 measurements) for the frequency of pulsing flow in trickle beds was established by collecting the experimental results published over past 30 years. A new correlation based on artificial neural network (ANN) to predict the pulsation frequency was developed. Seven dimensionless numbers (groups) employed in the proposed correlation were liquid and gas Reynolds, liquid Weber, liquid Eotvos, gas Froude, and gas Stokes numbers and a bed correction factor. The comparisons of performance reported in the of literature and present correlations show that ANN correlation is a significant improvement in predicting pulsation frequency with an average absolute relative error (AARE) of 10% and a standard deviation less than 18%. 展开更多
关键词 trickle bed pulsing flow pulsation frequency artificial neural network
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Computer Controlled High Precise, High Voltage Pules Generator 被引量:1
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作者 但果 邹积岩 +1 位作者 丛吉远 董恩源 《Journal of China University of Mining and Technology》 2003年第1期88-92,共5页
High precise, high voltage pulse generator made up of high-power IGBT and pulse transformers controlled by a computer are described. A simple main circuit topology employed in this pulse generator can reduce the cost ... High precise, high voltage pulse generator made up of high-power IGBT and pulse transformers controlled by a computer are described. A simple main circuit topology employed in this pulse generator can reduce the cost meanwhile it still meets special requirements for pulsed electric fields (PEFs) in food process. The pulse generator utilizes a complex programmable logic device (CPLD) to generate trigger signals. Pulse-frequency, pulse-width and pulse-number are controlled via RS232 bus by a computer. The high voltage pulse generator well suits to the application for fluid food non-thermal effect in pulsed electric fields, for it can increase and decrease by the step length 1. 展开更多
关键词 high voltage pulse generator CPLD non-thermal effect
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电渣重熔工艺的现状
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作者 周保仓 《太钢译文》 1991年第3期53-56,共4页
关键词 电渣熔炼 返回冲程系统 控制系统
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On Existence and Uniqueness of Random Impulsive Differential Equations 被引量:1
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作者 ZHANG Shuorui SUN Jitao 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2016年第2期300-314,共15页
This paper studies existence and uniqueness for random impulsive differential equations.The authors first generalize a random fixed point theorem of Schaefer's type.Then the authors shall rely on the generalized S... This paper studies existence and uniqueness for random impulsive differential equations.The authors first generalize a random fixed point theorem of Schaefer's type.Then the authors shall rely on the generalized Schaefer's type random fixed point theorem to discuss the existence of the system.In addition,the authors study the existence and uniqueness of random impulsive differential equations by applying random Banach fixed point theorem and obtain some less conservative results.Finally,an example is given to illustrate the effectiveness of the results. 展开更多
关键词 EXISTENCE IMPULSES random differential equations random fixed point uniqueness.
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