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Method discussion for quick response grey prediction of stronger aftershocks of an earthquake sequence

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Acta Seismologica Sinica(English Edition) 1999年第1期12卷 78-83页

作者：平建军李永庆张清荣 Seismological Bureau of Hebei Province Shijiazhuang 050021 China

In this paper, we take occurrence process of early strong aftershocks of a main after shock type′s earthquake sequence as a complex grey system, and introduce predicting method for its stronger aftershocks by grey predicting theory. Through inspection prediction for 1998 Zhangbei M S=6.2 earthquake sequence, it shows that the grey predicting method maybe has active significance for the investigation of quick response prediction problems of stronger aftershocks of an earthquake sequence.

关键词： main after shock type′s earthquake sequence stronger aftershock grey prediction

grey prediction of Siltation in North Channel of Yangtze Estuary

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China Ocean Engineering 1994年第2期9卷 207-216页

作者： Yu Cimei Shanghai Waterways Design & Research Institute, Shanghai 200120

-The North Channel in the Yangtze Estuary is one of sea-leading waterways of Shanghai Harbour, in which yearly dredging volume reaches over ten million cubic meters, and it tends to increase year by year. Based on the channel regime similarity and through the relational grade, a GM (2, 1) is set up. It reveals the course of development of channel regime similarity under the action of various factors, and predicts the siltation volume in the nearest future which is the basis of dredging planning for relevant dredging departments.

关键词： grey prediction siltation Yangtze Estuary dredge

grey prediction in the Application of Friction Compensation

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Grey Prediction in the Application of Friction Compensation

2009中国控制与决策会议

作者： Wang Weihong,Wang Xiyang Automatic Department,Beihang University,Beijing 100083

＜正＞A method of combining GM（0,N） model with BP neural network is proposed and used in friction *** BP neural networks compensate the friction,then BP network is replaced with GM（0,N） model in a certain *** this method the neural network can apperceive the friction torque by online self-learning and *** results of both simulation and experiment show that the method is feasible and effective on the friction compensation,it has well prospect for engineering application.

关键词： grey prediction Friction compensation BP neural networks Simulator Servo system

A grey prediction Model on Vibration Severity Development of a Pump

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International Journal of Plant Engineering and Management 2004年第3期9卷 131-138页

作者： ZHAORong-zhen ZHANGYou-yun InstituteofLubricationTheory＆Bearing Xi＇anJiaotongUniversityXi＇an710049P.R.China InstituteofLubricationTheory＆Bearing Xi＇anJiaotongUniversityXi＇an710049P.R.China

The method to enhance the precis io n of a grey model GM (1, 1) for predicting the development of vibration severity of a pump is investigated. The rectifying procedures involve the structure and the parameters regarding GM(1,1). A new model based on GM(1, 1), which is GM (E,1,1), is proposed. In GM(E,1,1), the distribution of relative errors rati os between the original series and predicting series obtained by the mean of GM( 1,1) are considered in special points to set up the threshold and adjusting coef ficients to control the modified action and the rectified amount based on distri bution of the original series. The case shows that GM(E, 1, 1) is good at predic ting the vibration severity development of the pump.

关键词： grey prediction GM (1 1) vibration severity p ump

Object Tracking Algorithm Based on Camshift and grey prediction Model in Occlusions

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Object Tracking Algorithm Based on Camshift and Grey Predict...

2012年计算机应用与系统建模国际会议

作者： Zhiwei Wang Fuping Yang College of Computer Science and Information Guizhou University College of Computer Science and Technology Chongqing University of Posts and Telecommunications

In this paper, an improved object tracking algorithm based on Camshift and grey prediction model GM (1.1) was proposed to solve problem of the poor tracking ability in occlusions. The whole tracking system could be divided into three parts: the occlusions identifying system based on Bhattacharyya coefficient analysis, the prediction system based on grey model GM (1.1) and Camshift algorithm. In the tracking process, those three parts run by turns according to different cases. Experiment results of variant video sequences demonstrate that the proposed method can track the objects stably and accurately during occlusions.

关键词： Occlusions grey prediction Camshift Object tracking

Research on restraining the end effect of EMD based on grey prediction model

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Research on restraining the end effect of EMD based on grey ...

第26届中国控制与决策会议

作者： Yong-tao ZONG Yan-xia SHEN Zhi-cheng JI Ding-hui WU Ting-long PAN Institute of Electrical Automation Jiangnan University

Empirical Mode Decomposition（EMD） is an advanced method for analyzing non-stationary signal, but there is an involved end issue in the course of getting two envelops of the data using spline interpolation. In this paper a novel method based on grey prediction model is proposed to restrain the end effect of empirical mode decomposition. In the grey prediction endpoint extension process, based on the theory of GM（1,1） prediction model, the endpoints are extended respectively to approach the variation tendency of the original data sequences. Simulation result shows that the proposed method can restrain end effect effectively and the parameters of grey prediction are easy to determine.

关键词： Empirical mode decomposition End effect grey prediction Fault diagnosis

Intelligent Predictive Analysis of the Performance Level of Discipline Construction in Local Universities Based on grey prediction

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Intelligent Predictive Analysis of the Performance Level of ...

作者： Limei Liu Xiuling Li School of Applied Mathematics Jilin University of Finance and Economics

In order to overcome the difficulties in measurement data collecting of the performance level of discipline construction in local universities,GM（1,1） grey prediction model was used to predict and analyze the performance level of discipline construction in local universities,which combined with the general performance indicator system of discipline *** research shows that to improve the performance level of discipline construction,we must strengthen the construction of teaching staff,ensure sufficient and high-quality teaching resources,optimize the process of personnel training,promote the development of students,strengthen quality supervision and guarantee,enhance the scientific research ability and awareness of teachers and students,clarify the orientation and goals of universities and actively promote the economic and social development of the country and the region.

关键词： Discipline Construction Local Universities Performance Level grey prediction Intelligent prediction

STUDIES ON grey MODEL DYNAMIC prediction TO CAVITATION DAMAGE OF TURBINES

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Journal of Hydrodynamics 2003年第5期15卷 29-34页

作者： Wu Fu sheng, Tong Zhong shan, Li Yun hui Nanjing Hydraulic Research Institute, Nanjing 210029, China Nanjing Hydraulic Res. Inst. Nanjing 210029 China

In thus paper, cavitation damage of turbines is firstly analyzed andpredicated from the view point of system engineering by use of the grey system theory. A detaileddescription of modeling, dynamic prediction and accuracy test for the grey system of turbines wasgiven. Two special cases for grey dynamic prediction as well as its accuracy test were *** results fall into the grade I, the accuracy is satisfactory and its prediction requirements canbe met well. It shows that the grey system theory can be employed to predict the cavitation damageof turbines, and it can provide a scientific basis for timely investigation and maintenance ofturbines.

关键词： turbine cavitation damage grey prediction

The softening prediction of HSLA steel heat-affected zone based on the grey system

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China Welding 2012年第2期21卷 69-72页

作者：赵璇代克杰杜泽国 School of Power and Mechanical Engineering Wuhan UniversityWuhan430027 College of Physics&Electric-Information Engineering Pingdingshan UniversityHenan467000 Dongfeng Motor Corporation Technical Center Wuhan430058

The high-strength low-alloy（ HSLA ） steel heat-affected zone （HAZ）softening was predicted using a grey model. HSLA steel DILLIMAX690E, NK-HITEN61OU2 and BHW35 were taken as examples in the research on ultra-narrow gap automatic welding technology. Test results turned out to be that the errors between the values calculated by the grey Model （GM）（ 1,1 ） model and their actual value were less than 2%, indicating that the grey prediction method could accurately reflect the actual situation of the high-strength low-alloy steel heat-affected zone softening. This method will play a crucial role in guiding the applications of HSLA steel welded structures in the future.

关键词： grey prediction GM ( 1 1 ) model heat-affected zone softening