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浏览/检索结果: 共8条，第1-8条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择发表日期升序发表日期降序作者升序作者降序提交时间升序提交时间降序题名升序题名降序 Thermally rearranged polymer membranes containing highly rigid biphenyl ortho-hydroxyl diamine for hydrogen separation 期刊论文 JOURNAL OF MEMBRANE SCIENCE, 2020, 卷号: 604, 页码: 12 作者:  Hu, Xiaofan;  Lee, Won Hee;  Zhao, Jiayi;  Kim, Ju Sung;  Wang, Zhen 收藏  |  浏览/下载：18/0  |  提交时间：2020/09/22 Polyimides  TR polymers  High rigidity  Hydrogen separation  Membranes   Stability recognition for high-speed milling of TC4 thin-walled parts with curved surface 期刊论文 INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 2017, 卷号: 91, 页码: 2819-2829 作者:  Ma, Jian-wei;  Liu, Zhen;  Jia, Zhen-yuan;  Song, De-ning;  Gao, Yuan-yuan 收藏  |  浏览/下载：8/0  |  提交时间：2019/12/02 Thin-walled  High-speed milling  Cutting vibration  Rigidity variation  Stability domain   Design and Application of Vibrator Driven by Piezoelectric Stack Based on Low Frequency Vibration Cutting 会议论文 3rd International Conference on Material, Mechanical and Manufacturing Engineering (IC3ME), JUN 27-28, 2015 作者:  Kong Fanxia 收藏  |  浏览/下载：5/0  |  提交时间：2019/12/31 Low-frequency vibration cutting  high-rigidity  piezoceramics  superalloys   Equivalent rigidity model for three axis suspended actuators 期刊论文 2010, 2010 Zhang Buqing; Ma Jianshe; Pan Longfa; Cheng Xuemin; Tang Yi 收藏  |  浏览/下载：2/0 2.4m风洞大迎角机构结构设计与有限元分析 期刊论文 2010, 2010 陈振华; 陈万华; CHEN Zhen-hua; CHEN Wan-hua 收藏  |  浏览/下载：2/0 Study on the azimuth bearing scheme of a large Alt-azimuth telescope (EI CONFERENCE) 会议论文 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China Wang H.; Zhang J.; Dai S. 收藏  |  浏览/下载：32/0  |  提交时间：2013/03/25 The azimuth bearing schemes in typical large Alt-azimuth telescopes  especially the 3.5-m APO telescope and the 4.1-m SOAR telescope were analyzed. A scheme of high-angular contacted thrust ball bearing integrated with a radial ball bearing was put forward. According to the Hertz contact theory  the corresponding parameters were designed for engineering application. The static performance parameters  within the range of 60 85 original contact angle were calculated. Compared with the traditional plane thrust ball bearing  the results shows that the high-angular (80) contact thrust ball bearing has more benefits at bearing strength and rigidity for large telescope. The 1500mm diameter prototyping bearing shows good performance  including the axial jitter is 0.009mm  the radial jitter is 0.006mm  the maximum starting torque without load is 30N·m  and the load capacity is more than 30t  which offers advanced technique path for the buildup of the high precision azimuth shafting and the whole telescope system. 2010 Copyright SPIE - The International Society for Optical Engineering.   Modulation transfer function in seeker camera limits resulting from missile flutter caused by aerodynamic force (EI CONFERENCE) 会议论文 2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China Ai X.; Zhang X.; Jiang Z.; Wei Q.; Jia H. 收藏  |  浏览/下载：25/0  |  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.   Application research of intelligent algorithm in electric-driven flight simulation turntable (EI CONFERENCE) 会议论文 ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM 2008, August 3, 2008 - August 4, 2008, Guangzhou, China Xie M.-J.; Wang Z.-Q.; Wang L.-M. 收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25 Application Research of Intelligent Algorithm in Electric-driven Flight Simulation Turntable is discussed in this paper. Fuzzy control is used to solve the problem of fast tracking and overshoot since its essence belongs to PD control In order to improve the performance of system in low speed  a method named variance-gain adaptive algorithm is introduced in this paper. It defines the amplifier gain as a function whose independent variable is speed  so the amplifier gain can automatically be adjusted with the change of speed. When the turntable runs at low speed  it has a big amplifier gain  a good rigidity and high tracking accuracy. When the turntable runs at high speed  the method can control the amplifier gain and ensure the system dynamic performance. Design and implementation of these algorithms is introduced in detail. Experiment results show that the Flight Simulation Turntable has achieved the required performance through using fuzzy control algorithm and variance-gain adaptive algorithm. 2008 IEEE.