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浏览/检索结果: 共6条，第1-6条 帮助 限定条件 发表日期：2012    内容类型：会议论文     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 Introduction and manufacturing of oblate spheroid mirror 会议论文 Xiamen, China, 2012-4-26 Li Depei; Yuan Lvjun; He Li; Wang Bin 收藏  |  浏览/下载：18/0  |  提交时间：2014/01/12 oblate spheroid mirror  testing method   Development of testing convex hyperbolic mirror using Hindle method based on stitching technology 会议论文 Amsterdam, Netherlands, 2012-7-1 Zi-bo Jiang; Xin-nan Li; Bo Ji 收藏  |  浏览/下载：18/0  |  提交时间：2014/01/09 Hindle method  aspherical mirror  stitching  sub-aperture  convex secondary mirror   Accuracy synthesis of a 3-RPS parallel robot based on manufacturing costs (EI CONFERENCE) 会议论文 31st Chinese Control Conference, CCC 2012, July 25, 2012 - July 27, 2012, Hefei, China Yao T.-K.; Xi Z.; Feng Z.; Zhang L.-M.; Yong W. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 Pose accuracy is an important issue for parallel robot being used as mirror supporting system of telescope. One challenging topic is the accuracy synthesis which deals with the optimal design of the manufacturing and assembling tolerances of each component under the given pose accuracy. First  the error model of the 3-RPS parallel robot is built based on total derivation of the kinematic equations. And the error variable of each spherical or rotate joint can be expressed as a single boundary error parameter but not three independent position parameters. Then  the accuracy synthesis model is formulated taking the manufacturing costs as the optimization objective and the accuracy requirements as the constraint condition. Finally  the genetic algorithm is used to solve the optimization problem and a simulation example is given. The results show that the accuracy synthesis method based on manufacturing costs can satisfy the need of pose accuracy and is better for engineering application than the method based on error sensitivity. 2012 Chinese Assoc of Automati.   Study on ultra-light secondary baffle for coaxial two-mirror telescope (EI CONFERENCE) 会议论文 2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China Zhang L.; Jia X.; Xie P.; Xing L. 收藏  |  浏览/下载：46/0  |  提交时间：2013/03/25 The coaxial two-mirror telescope consists of two mirrors facing each other. Classical two-mirror arrangements are Gregorian and Cassegrain. These systems are usually applied to space telescopes and often have optical baffles to prevent stray light from entering the focal plane. The optical baffles consist of concentric rings suspended between the secondary and the primary mirror. The secondary baffle for a large two-mirror optical system is designed and analyzed in this paper. According to mission of a telescope  the structure should have high stiffness and high reliability and light weight. Compared with invar  aluminum alloy and titanium alloy  carbon fiber composite is currently the best material in terms of weight-to-strength ratio. It also has advantages of high temperature tolerance and low thermal expansion. So carbon fiber composite is chosen as material to meet requirements of the coaxial telescope. In this paper  optimization method based on finite element analysis (FEA) is used for design the secondary baffle. Minimum weight of the baffle is chosen as an objective function. Thicknesses of former tube and vanes are chosen as variables. Analysis results show that the designed secondary baffle has maximum diameter of 180mm  total length of 120mm and weighs 142g. And its fundamental frequency reaches 651Hz. Therefore the baffle has many advantages  such as ultra-light weight  high stiffness and dimensional stability  etc. The optimization method and the baffle design can be helpful to other coaxial telescopes  such as Cassegrain  Gregorian and their subdivisions. 2012 IEEE.   Simulation test research of using the Ritchey-Common method for the detection of large flat mirror (EI CONFERENCE) 会议论文 2012 International Conference on Frontiers of Advanced Materials and Engineering Technology, FAMET 2012, January 4, 2012 - January 5, 2012, Xiamen, China Zhu S.; Zhang X. 收藏  |  浏览/下载：12/0  |  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.   Closed form spherical omnidirectional image unwrapping 会议论文 作者:  Chong, N.S.;  Wong, M.L.D.;  Kho, Y.H. 收藏  |  浏览/下载：2/0  |  提交时间：2019/12/10 Ground planes  Image unwrapping  Mapping equations  Method of images  Mirror point  non-single viewpoint  Omni-directional sensors  Omnidirectional image