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浏览/检索结果: 共6条，第1-6条 帮助 限定条件 内容类型：会议论文    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 Optimum design of the carbon fiber thin-walled baffle for the space-based camera (EI CONFERENCE) 会议论文 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China Yan Y.; Gu S.; An Y.; Jin G. 收藏  |  浏览/下载：11/0  |  提交时间：2013/03/25 The thin-walled baffle design of the space-based camera is an important job in the lightweight space camera research task for its stringent quality requirement and harsh mechanical environment especially for the thin-walled baffle of the carbon fiber design. In the paper  an especially thin-walled baffle of the carbon fiber design process was described and it is sound significant during the other thin-walled baffle design of the space camera. The designer obtained the design margin of the thin-walled baffle that structural stiffness and strength can tolerated belong to its development requirements through the appropriate use of the finite element analysis of the walled parameters influence sensitivity to its structural stiffness and strength. And the designer can determine the better optimization criterion of thin-walled baffle during the geometric parameter optimization process in such guiding principle. It sounds significant during the optimum design of the thin-walled baffle of the space camera. For structural stiffness and strength of the carbon fibers structure which can been designed  the effect of the optimization will be more remarkable though the optional design of the parameters chose. Combination of manufacture process and design requirements the paper completed the thin-walled baffle structure scheme selection and optimized the specific carbon fiber fabrication technology though the FEM optimization  and the processing cost and process cycle are retrenchment/saved effectively in the method. Meanwhile  the weight of the thin-walled baffle reduced significantly in meet the design requirements under the premise of the structure. The engineering prediction had been adopted  and the related result shows that the thin-walled baffle satisfied the space-based camera engineering practical needs very well  its quality reduced about 20%  the final assessment index of the thin-walled baffle were superior to the overall design requirements significantly. The design method is reasonable and efficient to the other thin-walled baffle that mass and work environment requirement is requirement harsh. 2011 SPIE.   Application of Vague set to Software rating ascertainment for space camera (EI CONFERENCE) 会议论文 2nd International Conference on Information Science and Engineering, ICISE2010, December 4, 2010 - December 6, 2010, Hangzhou, China Li Y.; Song K. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 Software rating ascertainment is very important in development of space camera software system. It can guide the software measurement and management  and help designer improve system reliability finally. Fault Tree Analysis is a common method to analyze the danger reason and fix on bottom events. The most significant step is calculating the occurrence probabilistic of top event  namely the occurrence probabilistic of dangerous event. Because software failure cause is anfractuous and available data are hard to get  a modeling method for bottom event is proposed based on Vague set to calculate the occurrence probabilistic of top event. Experimental results show that the new approach of Vague set can guide the Software rating ascertainment which is ascertained using qualitative analysis. The results also show that the new method makes software rating ascertainment have the quantificational evidence. 2010 IEEE.   Signal integrity simulation design of image processor PCB combined with electromagnetic compatibility analyses based on altium designer 6 (EI CONFERENCE) 会议论文 2009 4th IEEE Conference on Industrial Electronics and Applications, ICIEA 2009, May 25, 2009 - May 27, 2009, Xi'an, China Cheng Y. Q.; Zhu M.; Ge W. 收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25 With the coming of the high-speed digital system age  signal integrity (SI) and electromagnetic compatibility (EMC) should not be ignored any more. In this paper  based on basic theories of SI and EMC  the high-speed digital design method for PCB using the SI simulation tool of Altium Designer 6 and EMC analyses is introduced  and the impedance control  power integrity (PI) design and SI (reflections and crosstalk) design of a piece of image processor PCB are demonstrated in detail. The simulation results show that the impedance control is perfect  reasonable termination can improve the waveforms and control the reflections and crosstalk. 2009 IEEE.   Signal Integrity Simulation Design of Image Processor PCB Combined with Electromagnetic Compatibility Analyses Based on Altium Designer 6 会议论文 2009 Cheng Y. Q.; Zhu M.; Ge W.; Ieee 收藏  |  浏览/下载：10/0  |  提交时间：2013/03/28 Effects of fabricated error on transmission performance of double screens cross loop slot FSS configuration (EI CONFERENCE) 会议论文 2006 7th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2006, October 26, 2006 - October 29, 2006, Guilin, China Cong Y.; Cong C.; He B. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 This paper proposes that the inter-layer separation distance (ISD) and the unit cell aligning error (UAE) are used as main variables to study the transmission performance attenuation of the double layer FSS configuration. The numerical analysis model for ISD and UAE was established and also was used to simulate the cross loop slot cell FSS transmission performance by the finite element and periodic moment method program. The double layer cross loop aperture FSS configuration designed was used as the numerical model. As a result of the numerical analysis  it is shown that both ISD and UAE produce insertion transmission loss (ITL) and insertion phase distortion (IPD) directly. Furthermore  ISD results in much loss of the amplitude of the transmitted signal for the FSS than UAE. It is significant for the designer for the multiplayer FSS to assign the fabricated error of the FSS dielectric layers. The UAE introduces the insertion phase variation badly.   Computer aided alignment for off-axis asphere null test (EI CONFERENCE) 会议论文 Optical Design and Testing II, November 8, 2004 - November 11, 2004, Beijing, United states Zheng L.; Xue D.; Zhang X. 收藏  |  浏览/下载：12/0  |  提交时间：2013/03/25 The method of null test is widely used for testing an aspheric mirror. During optical manufacturing process  the mirror has to be moved up and down for testing and fabricating. Because the alignment of null test is difficult and time costing  the efficiency of making aspheric mirror is decreased greatly. In order to solve the problem  we developed a software based on polynomial fitting to calculate the misalignment parameters. By using the software and computer numeric controlled adjusting equipments  the efficiency of testing is increased and the accuracy of test has reached up to /40 RMS where equals to 632.8nm  which has fulfilled the demand of the designer.