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| 1 | FORCE RIPPLE SUPPRESSION TECHNOLOGY FOR LINEAR MOTORS BASED ON BACK PROPAGATION NEURAL NETWORK显示文摘Various force disturbances influence the thrust force of linear motors when a linear motor (LM) is running.Among all of force disturbances,the force ripple is the dominant while a linear motor runs in low speed.In order to suppress the force ripple,back propagation(BP) neural network is proposed to learn the function of the force ripple of linear motors,and the acquisition method of training samples is proposed based on a disturbance observer.An off-line BP neural network is used mainly because of its high running efficiency and the real-time requirement of the servo control system of a linear motor.By using the function,the force ripple is on-line compensated according to the position of the LM.The experimental results show that the force ripple is effectively suppressed by the compensation of the BP neural network. | ZHANG Dailin CHEN Youping AI Wu ZHOU Zude KONG Ching Tom | 2008 | Chinese Journal of Mechanical Engineering2008，21，2： | 7 |
| 2 | Structural Characteristics and their Significance for Hydrocarbon Accumulation in the Northern Slope of the Central Sichuan Paleo-uplift显示文摘Based on 2D and 3D seismic data,the latest drilling data and field outcrop data of the northern slope of the Central Sichuan paleo-uplift,the structural analysis method is used to analyze unconformity development characteristics and fault characteristics during the key structural transformation period,discussing the influence of the structural characteristics on the hydrocarbon accumulation of deep carbonate rocks.The results show that:(1)The two key unconformities of the Tongwan and Caledonian periods were primarily developed in deep carbonate rocks.Firstly,Tongwan’s unconformities are characterized by regional disconformities between the second and third members of the Dengying Formation,the top formation of the Sinian and the lower Cambrian,strips of which zigzag through the north and south sides of the study area.Secondly,the Caledonian unconformity is characterized by a regional unconformable contact between the lower Permian and the ower Paleozoic strata.From NE to SW,the age of the strata,which were subject to erosion,changes from new to old,the denudation distribution showing as a nose-shaped structure which inclines towards the ENE.(2)Boundary fault and transtensional strike-slip faults developed in the Sinian to Paleozoic strata.In profile,there are three types of structural styles:steep and erect,flower structures,’Y’and reversed’Y’type faults.In plane view,the Sinian developed extensional boundary faults extending in an almost NS direction,strike-slip faults developing and extending linearly in approximately EW,WNW and NE strikes in the Cambrian,with characteristically more in the south and less in the north.(3)The faults in the northern slope show obvious zonal deformations in transverse view as well as significant stages and stratified activity in a longitudinal direction.Among them,the activity of faults in the Sinian was the strongest,followed by the activity in the Cambrian period,the activity intensity of faults in the Permian period being the weakest.This fault activity can be divided into four periods:Sinian,Cambrian-Permian,the early Indosinian period and the late Indosinian-Himalayan period,the transtensional strikeslip faults being the products of oblique extensions of pre-existing weak zones in the Xingkai and Emei taphrogenesis,with a particular inheritance in the main faults.(4)Combined with hydrocarbon accumulation factors,it is considered that the epigenetic karstification of the Tongwan and Caledonian unconformities in the northern slope controlled the formation and distribution of carbonate karst reservoirs over a large area,also acting as a good pathway for oil and gas migration.The extensional faults developed at the margin of the NS trending rift,controlling the sag-platform sedimentary pattern in the Dengying Formation of the Sinian.Strike-slip faults in NE,WNW and ENE directions may control the microgeomorphological pattern inside the platform and intensify the differential distribution of grain beach facies.The multi-stage hereditary activity of strike-slip faults not only improved the porosity and permeability of the reservoirs,but also acted as the main channel of oil and gas migration,providing favorable conditions for the development of the current multi-layer gasbearing scenario in the northern slope of the Central Sichuan Basin. | TIAN Xingwang LIU Guangdi LUO Bing YANG Yu WEN Long ZHANG Benjian CHEN Xiao SU Guiping SONG Zezhang PENG Hanlin ZHOU Gang YAN Wei YANG Dailin WANG Yunlong SUN Yiting DOU Shuang | 2022 | Acta Geologica Sinica(English Edition)2022，96，4： | 2 |
| 3 | Experiments on particle cluster behaviors in a fast fluidized bed显示文摘A three-dimensional(3D) fast fluidized bed with the riser of 3.0 m in height and 0.1 m in inner diameter was established to experimentally study the cluster behaviors of Geldart B particles. Five kinds of quartz sand particles(dp= 0.100, 0.139, 0.177, 0.250 and 0.375 mm and ρp= 2480 kg·m^(-3)) were respectively investigated, with the total mass of the bed material kept as 10 kg. The superficial gas velocity in the riser ranges from 2.486 to 5.594 m·s^(-1) and the solid mass flux alters from 30 to 70 kg·((m^(-2)·s))^(-1). Cluster characteristics and evolutionary processes in the different positions of the riser were captured by the cluster visualization systems and analyzed by the self-developed binary image processing. The results found four typical cluster structures in the riser,i.e., the macro stripe-shaped cluster, saddle-shaped cluster, U-shaped cluster and the micro cluster. The increasing superficial gas velocity and particle sizes result in the increasing average cluster size and the decreasing cluster time fraction, while the solid mass flux in the riser have the reverse influences on the cluster size and time fraction. Additionally, clusters in the upper region of the riser often have the larger size and time fraction than that in the lower region. All these effects of operating conditions on clusters become less obvious when particle size is less than 0.100 mm. | Dailin Chen Xuejiao Liu Ziwen Sun Wenqi Zhong Baosheng Jin | 2017 | Chinese Journal of Chemical Engineering2017，25，9： | 2 |
| 4 | Fuzzy Set-Based Risk Evaluation Model for Real Estate Projects 显示文摘 | Yijian Sun Rufu Huang Dailin Chen | 2008 | Tsinghua Science & Technology2008，，1： | 1 |
| 5 | Precision motion control of permanent magnet linear motors显示文摘 | ZHANG Dailin CHEN Youping AI Wu | | 0，，： | 1 |
| 6 | Fuzzy Set - Based Risk Evaluation Model for Real Estate Projects 显示文摘 | Sun Yijian Huang Rufu Chen Dailin Li Hongnan | 2008 | Tsinghua Science and Technology2008，1，13： | 1 |
| 7 | A Fast Hidden-line Removal Algorithm for 3-Dimensional Buildings显示文摘AFASTHIDDEN-LINEREMOVALALGORITHMFOR3-DIMENSIONALBUILDINGSQinKaihuai;TongGeliang;ZhangNan;ChenDailin;LiYungui;ShenWenduAFASTHI... | Qin Kaihuai TongGeliang Zhang Nan Chen Dailin Li Yungui Shen Wendu | 1995 | Computer Aided Drafting,Design and Manufacturing1995，5，1： | 0 |
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