中国科学院机构知识库网格系统: 检索

Development of linear-element boundary element method for inverse solution from induced far-field displacements to reservoir loading source 期刊论文 OAI收割
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING, 2023
作者: Zhao, Yu; Li, Hong; Liang, Zhengzhao; Zhou, Hui; Gong, Bin

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收藏 | 浏览/下载：24/0 | 提交时间：2023/08/02

solution to inverse problems linear element of boundary ElementMethod space regularization ground surface displacement monitoring crack re-opening during fracturing

Engineering molecular dynamics simulation in chemical engineering 期刊论文 OAI收割
Chemical Engineering Science, 2015, 页码: 200-216
Xu, J.; Li, X. X.; Hou, C. F.; Wang, L. M.; Zhou, G. Z.; Ge, W.; Li, J. H.

收藏 | 浏览/下载：32/0 | 提交时间：2015/04/01

Engineering MD simulation Chemical processes Meso-scale Multiscale EMMS paradigm Particle methods SMOOTHED PARTICLE HYDRODYNAMICS FORCE-DISPLACEMENT MODEL FINITE/DISCRETE ELEMENT SIMULATION LINEAR CONSTRAINT SOLVER SHOT PEENING PROCESSES COAL PYROLYSIS STABILITY CONDITION MULTISCALE METHOD INTERACTION LAWS FLUIDIZED-BEDS

Influence of tilt moire fringe on alignment accuracy in proximity lithography 期刊论文 OAI收割
OPTICS AND LASERS IN ENGINEERING, 2013, 卷号: 51, 期号: 4, 页码: 371-381
作者: Zhu, Jiangping; Hu, Song; Yu, Junsheng; Tang, Yan; Xu, Feng

收藏 | 浏览/下载：24/0 | 提交时间：2015/04/17

Angular displacement Phase Tilt moire fringe Lithography alignment Linear displacement

Design and test of a novel cost-effective piezo driven actuator with a two-stage flexure amplifier for chopping mirrors 会议论文 OAI收割
Amsterdam, Netherlands, 2012-7-1
作者: Dehua Yang; Aihua Li; Guohua Zhou; Bintang Yang; Qingguo Wu

收藏 | 浏览/下载：37/0 | 提交时间：2014/01/09

linear actuator two-stage displacement amplifier piezoelectric and magnetostrictive flexure finite element analysis

Method of improving the accuracy of image motion measurement for panoramic aerial cameras (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, April 26, 2010 - April 29, 2010, Dalian, China
作者: Jia P.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

To improve the accuracy of image motion measurement for panoramic aerial cameras the paper proposed a method of real-time image motion measurement based on 2D spatial correlation. An auxiliary area CCD is positioned paralleled to the main linear TDI CCD in the focal plane of the camera. For every frame of the image sequence taken by the auxiliary CCD a prediction on the displacement of the current image in the flight direction is made based on the forward image motion velocity. The current and the reference images are combined together for 2D-correlation which products an image motion vector. By decomposing the vector both the forward and pendulum-swing image motions can be determined. The demanding computational requirements for the real-time 2D-correlation are covered by a joint transform optical correlator. Simulation test results show that the accuracy is improved and the measurement error is within 0.2 pixels for input images with SNR=1 dB. 2010 Copyright SPIE - The International Society for Optical Engineering.

Application of precision harmonic gear drive in focusing mechanism of space camera (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

A kind of precision harmonic gear drive in the focusing mechanism of space camera is studied which adopt external meshing complex wave transmission mode. Wave generator is combined with an elliptic cam and a flexible bearing around it. Flexspline is a structure of single wave with the same teeth. The output shaft is supported by a single cross-roller bearing. Ball screws connected the output shaft translate the rotational motion to the linear motion and drive the focusing mirror repeated moving along the linear guide. The output rigid wheel is connected with absolute encoder to detect displacement of focusing movement. It has the characteristics of big transmission ratio high precision compact structure high efficiency and smooth running etc. According to the practical application of this harmonic gear drive in the space camera the location relationship between the displacement of focusing structure and the focal plane movement is derived and the system error is analyzed its accuracy is tested with the open-loop control method. Experimental results show that transmission ratio of the instrument is 1:70 repeated positional accuracy is 2m which meet the requirements for use. 2010 SPIE.

Modulation transfer function in seeker camera limits resulting from missile flutter caused by aerodynamic force (EI CONFERENCE) 会议论文 OAI收割
2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

The imaging quality of seeker in flight mode has been evaluated through analyzing the effects of missile flutter on optical modulation transfer function (MTF) of the optical system. Firstly the data of transverse vibration has been processed to eliminate the trend term caused by the trajectory then obtained the displacement with two times trapezoidal integration. For the side rotation the high frequency noise interference in the data has been filtered by using five-point moving average method. Took this model as the quivering rule between the object and the image and then analyzed the effects of the transverse vibration and the side rotation on imaging quality through MTF. By calculation the r.m.s value of the image motion caused by missile transverse vibration is 0.026mm and the side rotation angle is 0.0044 . Through the establishment of two modulation transfer functions (MTF) of image random vibration and linear vibration the results show that the image quality had declined and the effect of transverse vibration on image quality is obvious. Through improving the rigidity of the missile and selection of small focal length optical system and shorten the time of exposure can improve the imaging quality of the seeker. 2010 IEEE.

The study of mapping relation of aeroplane complex motion and image movement and compensation technique (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer Application and System Modeling, ICCASM 2010, October 22, 2010 - October 24, 2010, Shanxi, Taiyuan, China
Wei Z.; Wang Y.-Y.; Xue W.-Q.; Dai M.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

In order to solve the problem of image blurring due to the image motion which results from the aircraft's motion attitude changes and the relative motion of the camera and aircraft firstly we install linear displacement transducer on the four shock absorbers. By analyzing the displacement values the geometrical relationship between the camera and the aircraft is acquired then relative motion amount between the object and the aircraft is obtained according to the motion and attitude changes. After that making use of geometrical relationship we can calculate the displacement variation of pixels within the camera exposure time. Thereafter taking consider variable motion and non-linear motion as uniform motion in a straight line at the moment of imaging then the model of the blurring image can be established according to the displacement variation of pixels within the camera exposure time and fuzzy point spread function in the two-dimensional movement is built. By using Wiener filtering method with the optimal window the image blurring is eliminated in aerial imaging system. Practice proved that this method can effectively eliminate the image blurring in the aerial imaging system. 2010 IEEE.

Stability Analysis Of The Moving Interface In Piston- And Non-Piston-Like Displacements 期刊论文 OAI收割
Acta Mechanica Sinica, 2008, 页码: 381-385
作者: Bai YH(白玉湖); Zhou JF(周济福); Li QP(李清平)

收藏 | 浏览/下载：988/39 | 提交时间：2009/08/03

Piston-Like Displacement Non-Piston-Like Displacement Two-Phase Percolation Moving Interface Stability Analysis Porous-Media Miscible Displacement Linear-Stability

Study of high precision non-contact measurement based on CCD (EI CONFERENCE) 会议论文 OAI收割
4th International Conference on Information Technology and Applications, ICITA 2007, January 15, 2007 - January 18, 2007, Harbin, China
Lin L.; Yun F.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

In this paper a method that measures relatively positionrelationshipquickly and accurately between two vehicles both on a horizontal plane is introduced. When the linear CCD camera placed on the end of manipulator scans two point targets located on the other vehicle by virtue of the spatial intersection principle and trigonometry theorem the relative position relationship between the loading vehicles and launching ones can be gotten(i.e. the spatial coordinate parameters of x y z and the angle displacement ). At the same time the paper establishes that the measurement error of length is less than 1mm by analysis of thee rror analysis and the simulation of computer. The angle displacement is less than 3 which satisfies the technical requests. So the vehicle orientation and loading missiles can be both done at the shortest time. It meets the demand of centralization between the measurement and execution. Forboth automatic transshipment and spatial position relationship measurement the study is valuable. And the manipulator is measure device as well as executive one so that residual inherent error decreases according to identical reference principle. Therefore the measure precision can be improved greatly.