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浏览/检索结果: 共11条，第1-10条 帮助 限定条件 专题：长春光学精密机械与物理研究所    第一署名单位    第一作者单位    通讯作者单位     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 The design and implementation of positioning system based on GPS 会议论文 2nd International Conference on Precision Mechanical Instruments and Measurement Technology, ICPMIMT 2014, May 30, 2014 - May 31, 2014, Chongqing, China Liu Y.-Y.; Li G.-N.; Wang L.-F. 收藏  |  浏览/下载：20/0  |  提交时间：2015/04/27 Bi-station multi-target tracking using range and doppler measurements 期刊论文 Applied Mechanics and Materials, 2013, 卷号: 329 Tianjiao F.; Liguo Z.; Jianyue R. 收藏  |  浏览/下载：15/0  |  提交时间：2014/05/14 Structural design of primary mirror subassembly for space telescope (EI CONFERENCE) 会议论文 2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan Xu H. 收藏  |  浏览/下载：43/0  |  提交时间：2013/03/25 In order to design a large aperture primary mirror with the diameter of 1150 mm  the parameters impacting on gravity deformation of the mirror were analyzed and discussed in detail  including material selection  diameter-thickness ratio  the number of the support points  location selection and lightweight structure  etc. A novel space mirror structure system was put forward  and its back was opened and supported by six points on back. The dynamic and static and thermal characteristics were analyzed based on the finite element method. Analysis results showed the surface figure accuracy reached to RMS 14.5nm under the action of gravity load along the optical axis direction and the first-order natural frequency was 214Hz which met to the designed indexes requirements. (2013) Trans Tech Publications  Switzerland.   Structural design of large aperture rectangular mirror for space telescope (EI CONFERENCE) 会议论文 2nd International Conference on Civil Engineering and Transportation, ICCET 2012, October 27, 2012 - October 28, 2012, Guilin, China Li Z. 收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25 Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness  strength and thermal dimensional stability  some factors such as support scheme  materials selection  lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge  influences of gravity  assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5C uniform temperature rise respectively  the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz  which shows an error less than 5% compared to FEA results. (2013) Trans Tech Publications  Switzerland.   Centroid localization algorithm based on bicubic interpolation gray square weighted 会议论文 2012 3rd International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2012, December 22, 2012 - December 23, 2012, Beihai, China Zhou J.; Chen X.-L.; Li S.-J.; Huang D.-Y.; Ma G.-Z. 收藏  |  浏览/下载：16/0  |  提交时间：2014/05/15 Structural design of primary mirror subassembly for space telescope 会议论文 2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan Xu H. 收藏  |  浏览/下载：16/0  |  提交时间：2014/05/15 Centroid localization algorithm based on bicubic interpolation gray square weighted (EI CONFERENCE) 会议论文 2012 3rd International Conference on Advances in Materials and Manufacturing Processes, ICAMMP 2012, December 22, 2012 - December 23, 2012, Beihai, China Zhou J.; Chen X.-L.; Li S.-J.; Huang D.-Y.; Ma G.-Z. 收藏  |  浏览/下载：142/0  |  提交时间：2013/03/25 The 3D coordinates of measured point is embodied in 2D image coordinate of the optical characteristic point via the visual measurement system. Based on the gray square weighted centroid localization algorithm  the paper presents bicubic interpolation gray square weighted centroid localization algorithm  increases the number of effective pixels around the optical characteristic point imaging center  and reduces noise error via the gray square weighted  improves the imaging center location accuracy of optical characteristic point  realizes the accurate location of the optical characteristic points. Results indicate application of the proposed algorithm to location  the standard tolerance along the direction of x is 0.0022 Pixel  the standard tolerance along the direction of y is 0.0023 Pixel  compared with the others  the standard tolerance is minimum and discrete to a lesser degree distancing ideal image point  that is  the proposed algorithm has higher location accuracy. The maximum tolerance along the direction of x is 0.008 Pixel  the one along the direction of y is 0.007 Pixel  compared with the other two algorithms  the maximum tolerance is minimum.Results indicate that the stability of the proposed algorithm is better. (2013) Trans Tech Publications  Switzerland.   Structural design of large aperture rectangular mirror for space telescope 会议论文 2nd International Conference on Civil Engineering and Transportation, ICCET 2012, October 27, 2012 - October 28, 2012, Guilin, China Li Z. 收藏  |  浏览/下载：8/0  |  提交时间：2014/05/15 The research of round raster readheads scheme (EI CONFERENCE) 会议论文 3rd international Conference on Manufacturing Science and Engineering, ICMSE 2012, March 27, 2012 - March 29, 2012, Xiamen, China Cong J.-F. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 The round raster is extensively applied in all kinds of high accuracy angular displacement measurement and control system. With the development of precise mechanotronics measuring instrument  machining center  CNC machine and various precise location testing technology  a higher request is put forward to the accuracy and the function of raster measurement system. In this article it is concluded that double readheads is the most reasonable configuration scheme through tests of single readhead scheme  two readheads and four readheads. (2012) Trans Tech Publications.   A sub-pixel extraction method for the center of the circular structure from spot array calibration target (EI CONFERENCE) 会议论文 2012 3rd International Conference on Information Technology for Manufacturing Systems, ITMS 2012, September 8, 2012 - September 9, 2012, Qingdao, China Liu Y.; Gao X.; Xu C.; Fu W.; Teng Y.; Yang H.; Zhang T. 收藏  |  浏览/下载：65/0  |  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.