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Control system design of a hex-rotor aircraft based on the neural network sliding mode method 会议论文
2014 International Conference on Mechatronics and Intelligent Materials, MIM 2014, May 18, 2014 - May 19, 2014, Lijiang, China
Zhao C. J.; Bai Y.; Gong X.; Xu D. F.; Xu Z. J.
收藏  |  浏览/下载：16/0  |  提交时间：2015/04/27
Region weighted wavelet fusion method for partial focusing image 会议论文
2013 4th International Conference on Advances in Materials and Manufacturing, ICAMMP 2013, December 18, 2013 - December 19, 2013, Kunming, China
Wu D.; Dai L.; Bai X. W.; Wang Z. Q.; Zhang Y. Y.
收藏  |  浏览/下载：11/0  |  提交时间：2015/04/27
Study on nonlinear dynamics of planetary reducer 会议论文
3rd International Conference on Materials Science and Information Technology, MSIT 2013, September 14, 2013 - September 15, 2013, Nanjing, Jiangsu, China
Han X. F.; Bai Y.; Li M.; Jia H. G.
收藏  |  浏览/下载：7/0  |  提交时间：2014/05/15
ADRC trajectory tracking control based on PSO algorithm for a quad-rotor 会议论文
2013 IEEE 8th Conference on Industrial Electronics and Applications, ICIEA 2013, June 19, 2013 - June 21, 2013, Melbourne, VIC, Australia
Peng C.; Tian Y.; Bai Y.; Gong X.; Zhao C.; Gao Q.; Xu D.
收藏  |  浏览/下载：11/0  |  提交时间：2014/05/15
Organogels from unsymmetrical pi-conjugated 1,3,4-oxadiazole derivatives 会议论文
Conference Location, 2013
Zhao C. X.; Wang H. T.; Bai B. L.; Qu S. N.; Song J. X.; Ran X.; Zhang Y.; Li M.
收藏  |  浏览/下载：22/0  |  提交时间：2014/05/22
Trajectory tracking control of a quad-rotor UAV based on command filtered backstepping (EI CONFERENCE) 会议论文
2012 3rd International Conference on Intelligent Control and Information Processing, ICICIP 2012, July 15, 2012 - July 17, 2012, Dalian, China
Gong X.; Bai Y.; Peng C.; Zhao C.; Tian Y.
收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25
A quad-rotor unmanned aerial vehicle is an under-actuated  strong coupled nonlinear system with parameters uncertainty and unknown external aerodynamic disturbance. The trajectory tracking control system with a nested double-loops structure is designed in this paper according to the coupling characteristic between the attitude angles and translational position. A PD control algorithm is proposed in the translational outer-loop to export the desired attitude signals to the attitude inner-loop. An adaptive backstepping control algorithm is designed in the inner-loop with respect to the uncertain rotational inertia and un-modeled disturbance  while in order to reduce the computational complexity the command filtered approach is introduced into the designing procedure. And finally  the numerical simulation results are presented for the trajectory tracking stabilization of a Quad-rotor  which demonstrates the excellent performance of the proposed control system and illustrate its robustness in face of disturbance and uncertain parameters. 2012 IEEE.  
Alternating stress dynamics analysis of harmonic gear flexible wheel (EI CONFERENCE) 会议论文
2012 International Conference on Electrical Insulating Materials and Electrical Engineering, EIMEE 2012, May 25, 2012 - May 27, 2012, Shenyang, Liaoning, China
Han X.; Bai Y.; Li M.; Jia H.
收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25
This article is the study of alternating stress of flexible wheel in harmonic gear drive system. Firstly  then  Finally  according to elasticity theory to theoretically analyze flexible wheel stress  based on the basic principle of sub-structure modal synthesis method  based on the dynamics simulation  use the software of UG  to analyze the alternating stress simulation results of flexible wheel and compare theoretical results and simulation results to come conclusion. The results show that: altering stress simulation results of flexible wheel are coincident with theoretical simulation results  PATRAN and ADAMS to carry out co-simulation  have a deeper understand the stress change trend in the drive process of flexible wheel  lay a foundation for further carrying out dynamics simulation of harmonic gear drive system. (2012) Trans Tech Publications  Switzerland.  
Trajectory tacking control of a quad-rotor based on active disturbance rejection control (EI CONFERENCE) 会议论文
2012 IEEE International Conference on Automation and Logistics, ICAL 2012, August 15, 2012 - August 17, 2012, Zhengzhou, China
Gong X.; Tian Y.; Bai Y.; Zhao C.
收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25
The objective of this paper is to deal with a trajectory tracking of a Quad-rotor unmanned aerial vehicle (UAV). For the model uncertainty  the external disturbance and the coupling factor are considered  an active disturbance rejection control (ADRC) algorithm is introduced into the designing procedure. The aircraft dynamic model is proposed in this article  based on which the closed-loop control system is divided into four independent channels with the coupling factor compensated by the extended state observer (ESO). The nonlinear state error feedback (NLSEF) algorithm is designed in each channel to improve the closed-loop dynamics. In this article  the ADRC controller is expressed in the discrete form. And finally  the simulation results show that the proposed control algorithm achieves a favourable tracking performance. 2012 IEEE.  
Reliable attitude stability control of quad-rotor based on fault-tolerant approach (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
Gong X.; Peng C.; Tian Y.; Bai Y.; Zhao C.; Gao Q.; Xu Z.
收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25
Nanoscale patterns made by using a 13.5-nm Schwarzschild objective and a laser produced plasma source (EI CONFERENCE) 会议论文
Optical Micro- and Nanometrology IV, April 16, 2012 - April 18, 2012, Brussels, Belgium
Wang Z.; Wang X.; Mu B.; Bai Y.
收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25
Lithium fluoride (LiF) crystal is a very promising candidate as nanometer resolution EUV and soft X-ray detector. Compared with other EUV and soft X-ray detectors  charge coupled device and photographic films  LiF crystal has high resolution  large field of view and wide dynamic range. In this paper  using LiF crystal as EUV detector and a Schwarzschild objective (SO) working at 13.5nm as projection optics  mesh images with 4.2 m  1.2 m and 800 nm line width and pinhole patterns with 1.5m diameter are acquired in projection imaging mode and direct writing mode  respectively. Fluorescence intensity profiles of images show that the resolution of mesh image is 900 nm  and the one of pinhole image is 800 nm. In the experiments  a spherical condense mirror based on normal incidence type is used to eliminate the damage and contamination on the masks (mesh and pinhole) caused by the laser plasma  and the energy density is not decreased compared with that the masks are close to the plasma. The development of the SO  the alignment of the objective and the imaging experiments are also reported. 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  

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