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长春光学精密机械与... [12]
高能物理研究所 [3]
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会议论文 [13]
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Physics [1]
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Structured mesh refinement in MLS-based numerical manifold method and its application to crack problems
期刊论文
OAI收割
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS, 2017, 卷号: 84, 页码: 42-51
作者:
Liu, Feng
;
Xia, Kaiwen
  |  
收藏
  |  
浏览/下载:26/0
  |  
提交时间:2018/06/05
Numerical manifold method
Moving least squares
Stress intensity factor
Crack propagation
Eccentric domain of influence
Structured mesh refinement
Exact imposition of essential boundary condition and material interface continuity in Galerkin-based meshless methods
期刊论文
OAI收割
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, 2017, 卷号: 110, 期号: 7, 页码: 637-660
作者:
Li, Wei
;
Zheng, Hong
;
Du, Xiuli
  |  
收藏
  |  
浏览/下载:26/0
  |  
提交时间:2018/06/05
meshless methods
Galerkin variational procedure
partition of unity
numerical manifold method
moving least squares interpolations
Self-adaptive echo signal processing method for pulse radar ranging system
会议论文
OAI收割
2016 IEEE Information Technology, Networking, Electronic and Automation Control Conference, ITNEC 2016, Chongqing, China, May 20-22, 2016
作者:
Gao J(高洁)
;
Du JS(杜劲松)
;
Bi X(毕欣)
收藏
  |  
浏览/下载:45/0
  |  
提交时间:2016/11/01
time-of-flight
Pulse radar
characteristic values
Parabola fitting
the least-squares method
A sub-pixel extraction method for the center of the circular structure from spot array calibration target (EI CONFERENCE)
会议论文
OAI收割
2012 3rd International Conference on Information Technology for Manufacturing Systems, ITMS 2012, September 8, 2012 - September 9, 2012, Qingdao, China
作者:
Liu Y.
;
Zhang T.
收藏
  |  
浏览/下载:75/0
  |  
提交时间:2013/03/25
The imaging measurement system must be calibrated before application. In calibration procedure
sub-pixel center extraction is the crucial step for the final accuracy. In this paper
a new sub-pixel extraction method is proposed. Edge detection at pixel level is obtained using LOG operator
then sub-pixel edge detection is realized using the Facet model. Finally
the least squares ellipse fitting is operated on the sub-pixel edge to determine the sub-pixel center. Experiment on a series of simulated images indicates that this algorithm is able to realize the center location accuracy of 0.01-0.02 pixel
and meets the requirement of sub-pixel level. (2012) Trans Tech Publications
Switzerland.
Simulation test research of using the Ritchey-Common method for the detection of large flat mirror (EI CONFERENCE)
会议论文
OAI收割
2012 International Conference on Frontiers of Advanced Materials and Engineering Technology, FAMET 2012, January 4, 2012 - January 5, 2012, Xiamen, China
作者:
Zhang X.
;
Zhang X.
;
Zhang X.
收藏
  |  
浏览/下载:17/0
  |  
提交时间:2013/03/25
In the detection of large flat mirror
the Ritchey-Common test can achieve high accuracy measurement. A method which expands the compressed images due to Ritchey Angle and rotates the plane under test is presented
achieve two sets of influence functions through this we can built two equations according to two different angular positions
we can solve the equations by least squares method. Then through fitting the coefficients
we can get the flat errors
this paper describe the simulation test of the method in order to prove the feasibility and reliability of this method. (2012) Trans Tech Publications.
Application of trend extrapolation method to spectrum analysis of microtremor signal (EI CONFERENCE)
会议论文
OAI收割
2nd World Congress on Computer Science and Information Engineering, CSIE 2011, June 17, 2011 - June 19, 2011, Changchun, China
Zhou X.
;
Guo T.
;
Jiao J.
收藏
  |  
浏览/下载:30/0
  |  
提交时间:2013/03/25
The trend extrapolation method is applied to spectrum analysis of microtremor signal in order to increase the spectral estimation accuracy. First
establish an appropriate extrapolation model based on the existing data series
and then fit correlation functions other than existing data by derivative least squares method
finally perform spectrum analysis using extrapolated correlation functions. Numerical simulations and the experimental results show that good results are achieved no matter correlation functions change slow or rapid
and the extrapolation error is not more than 2.3%. 2012 Springer-Verlag Berlin Heidelberg.
Research on image restoration of Roll-Swing imaging seeker (EI CONFERENCE)
会议论文
OAI收割
3rd IEEE International Conference on Advanced Computer Control, ICACC 2011, January 18, 2011 - January 20, 2011, Harbin, China
作者:
Zhang H.
;
Zhang H.
收藏
  |  
浏览/下载:28/0
  |  
提交时间:2013/03/25
To achieve a correct image receiving for Roll-Swing imaging seeker
the mechanism and imaging process is analyzed. The causes of image rotation are discussed. The influence of the frame encoders' precision on imaging de-rotation quality is analyzed. The Roll-Swing imaging seeker is designed for high-speed aerocraft
thus the received images are greatly degraded due to atmospheric turbulence. A new method of image restoration is proposed for turbulence-degraded images in this paper. The method is to get point spread function (PSF) based on the estimation of optical transfer function (OTF) according to the optical system design simulation. Finally
to obtain the restored image
constrained least squares filtering is used with the known PSF. The experiment results indicate that the new restoration method has a favorable effect to satisfy requirement of the automatic target recognition. 2011 IEEE.
Accuracy analysis and optimization design of constant-diameter cam (EI CONFERENCE)
会议论文
OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Yuan G.-Q.
;
Ding Y.-L.
;
Hui S.-W.
;
Liu Z.-H.
;
Li Y.-W.
收藏
  |  
浏览/下载:35/0
  |  
提交时间:2013/03/25
A constant-diameter cam gets its name because the centers of the rollers are a constant distance apart. This paper presents an Accuracy analysis and optimization design method for constant-diameter cam mechanism. Factors affecting the accuracy of cam are studied in the paper. The influences of the roller radial runout
cam machining error and the base circle radius on accuracy are analyzed. Then
a method to guarantee the cam diameter constant and remove return stroke error is studied using least-squares method. The analysis results indicate that the focusing accuracy can reach 4.4m
and the return stroke error can reach 4.8m the functioning of institutions is stable and reliable. 2011 IEEE.
Contribution of Molecular Properties to Extrapolation of the Volume of Distribution in Human from Preclinical Animal Species Data
期刊论文
OAI收割
BIOPHARMACEUTICS & DRUG DISPOSITION, 2010, 卷号: 31, 期号: 8-9, 页码: 464-475
作者:
Sui, Xiaofan
;
Sun, Jin
;
Li, Haiyan
;
Pan, Yang
;
Wang, Yongjun
  |  
收藏
  |  
浏览/下载:25/0
  |  
提交时间:2019/01/08
volume of distribution
molecular descriptors
partial least squares
allometric method
Design of aspherical surfaces for panoramic imagers using multipopulations genetic algorithm (EI CONFERENCE)
会议论文
OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, November 19, 2008 - November 21, 2008, Chengdu, China
作者:
Jin C.-S.
;
Wang L.-P.
;
Liang Z.-Z.
收藏
  |  
浏览/下载:30/0
  |  
提交时间:2013/03/25
A design method of aspherical surface for panoramic imaging system with two mirrors using multi-populations genetic algorithms is proposed. Astigmatism induced by mirrors may significantly compromise image resolution. To solve this problem
we induced algebraic expression of astigmatism in panoramic imager based on generalized Coddington equation and theory of geometric optics. Then
we propose an optimization process for mirror profile design to eliminate astigmatism and provide purposely-designed projection formula with aid of MPGA. A series of polynomial expressions of aspherical surfaces are obtained and procedures of the design are presented. In order to facilitate ray tracing and aberration calculation
even asphere surface model is obtained by using of hybrid schemes combining MPGA and damped least squares. Finally
a prototype of the catadioptric panoramic imager has been developed and panoramic ring image is obtained. 2009 SPIE.