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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 Robust trajectory tracking control of autonomous quad-rotor UAV based on double loop frame (EI CONFERENCE) 会议论文 2011 International Conference on Materials, Mechatronics and Automation, ICMMA 2011, January 15, 2011 - January 16, 2011, Melbourne, VIC, Australia Hou Z. C.; Gong X.; Bai Y.; Tian Y. T.; Sun Q. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 This paper deals with the under-actuated characteristic of a quad-rotor unmanned aerial vehicle (UAV). By designing the double loop configuration  the autonomous trajectory tracking is realized. The model uncertainty  external disturbance and the senor noise are also taken into consideration. Then the H controller is put forward in the inner loop. An optimal stability augmentation control (SAC) method is used to stabilize the horizon position and keep it away from oscillation. By calculating the nonlinear decouple map  control quantity is converted to the speeds of the four rotors. At last some simulation results and the prototype implementation prove that the control method is effective.   Stability control of quad-rotor based on explicit model following with inverse model feedforward method (EI CONFERENCE) 会议论文 2011 IEEE International Conference on Mechatronics and Automation, ICMA 2011, August 7, 2011 - August 10, 2011, Beijing, China Bai Y.; Gong X.; Hou Z.; Tian Y. 收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25 The quad-rotor is expected to carry out many different tasks. It is hoped that the quad-rotor can have different characteristics according to the different mission requirements. For this reason  a flight stability augmentation control system based on explicit model following with inverse model feedforward control method is proposed in this paper. This control system is composed of an explicit model  an inverse model and a feedback controller module. In order to calculate an inverse model of the coupled multivariable aircraft system  a feedback linearization loop is also applied to this control system. At last  simulations are performed to show the effectiveness of the designed stability augmentation control system in the presence of external disturbance and model uncertainty. The influence of explicit model to the characteristics of quad-rotor is also indicated in a contrast simulation result. 2011 IEEE.   Fabrication and testing of hard X-ray hourglass lenses 会议论文 2009 Liang J. Q.; Zhu Y. Q.; Cui N. D.; Liang Z. Z.; Le Z. C.; Yi F. T.; Hou F. J.; Zhu P. P.; Dong W.; Wang W. B. 收藏  |  浏览/下载：10/0  |  提交时间：2013/03/28 Fabrication and testing of hard X-ray hourglass lenses (EI CONFERENCE) 会议论文 Micro and Nano Technology - 1st International Conference Society of Micro/Nano Technology, CSMNT, November 19, 2008 - November 22, 2008, Beijing, China Liang J.; Zhu Y.; Cui N.; Liang Z.; Le Z.; Yi F.; Hou F.; Zhu P.; Dong W.; Wang W. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 Based on the refraction theory of the lens  the SU-8 photoresist hard X-ray hourglass lenses with three different structure parameters are fabricated. The mask-back exposure technique is introduced to fabricate the lenses. The focusing performance of this device is tested at Beijing Synchrotron Radiation Facility (BSRF). At the distance of 1.65m from the lenses  an obviously focusing performance in one dimension is observed. The relative intensity of the lenses with the largest gain is about 217.7  the gain of the lens is about 1.15  and the dimension of the focus is about 33m. The focusing performance of this device can be improved through the developing of the mask-back exposure technique. 2009 Trans Tech Publications  Switzerland.   Manufacturing and testing of the line-array fiber-optic image slicer based on silicon V-grooves - art. no. 683607 会议论文 2008 Liang J. Q.; Guo P.; Liang Z. Z.; Zhu Y. Q.; Hou F. J.; Yao J. S. 收藏  |  浏览/下载：10/0  |  提交时间：2013/03/28 Manufacturing and testing of the line-array fiber-optic image slicer based on silicon V-grooves (EI CONFERENCE) 会议论文 MEMS/MOEMS Technologies and Applications III, November 12, 2007 - November 14, 2007, Beijing, China Liang J.; Guo P.; Liang Z.; Zhu Y.; Hou F.; Yao J. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 Linear fiber-optic image slicer is used more and more in spatial exploration and imaging system. In this paper  a plane arranging method of fiber-optic array based on Si-V grooves is established in order to improve the accuracy and reduce the cost of manufacturing. Firstly  the Si-V groove array is micro-machined with anisotropic etching process  then optical fibers are placed in the grooves orderly with plane arranging method. Secondly  the end surfaces of the device are polished  also the linear fiber-optic image slicer is packaged. Finally  some parameters are tested  including structure parameters  transmittivity and vibration test. Experimental results indicate that the maximum error accumulated in 2000 periods of the Si-V grooves is 0.5 m  the error of the height in Si-V grooves is less than 0.15m  the roughness of the end surface is less than 0.9nm. The transmittivity of the linear fiber-optic image slicer that without optical film is 51.46% at the wavelength of 632.8nm. After random vibration experiment  the ratio of the broken fiber increased by 0.1%. While the temperature reached 320C  the stress of epoxy will be 130Mpa  which is close to the limit resistance stress of 139Mpa  some cracks appeared.