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浏览/检索结果: 共27条，第1-10条 帮助

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Extension and application of energy-minimization multi-scale (EMMS) theory for full-loop hydrodynamic modeling of complex gas-solid reactors 期刊论文  OAI收割
CHEMICAL ENGINEERING JOURNAL, 2015, 卷号: 278, 期号: OCT, 页码: 492-503
作者:  Liu, Xinhua;  Hu, Shanwei;  Jiang, Yuefang;  Li, Jinghai
收藏  |  浏览/下载：39/0  |  提交时间：2015/09/07
Characterization and modeling of living cell based actuation for bio-syncretic robot development 会议论文  OAI收割
Xi'an, China, April 7, 2015 - April 11, 2015
作者:  Zhang C(张闯);  Wang WX(王文学);  Wang YC(王越超);  Liu LQ(刘连庆)
  |  收藏  |  浏览/下载：16/0  |  提交时间：2015/09/08
A bio-syncretic micro-swimmer assisted by magnetism 会议论文  OAI收割
Changchun, China, October 5-9, 2015
作者:  Zhang C(张闯);  Wang WX(王文学);  Wang YC(王越超);  Liu LQ(刘连庆)
  |  收藏  |  浏览/下载：16/0  |  提交时间：2016/05/23
A Literature Review of UAV 3D Path Planning 会议论文  OAI收割
Shenyang, China, June 29 - July 4, 2014
作者:  Yang L(杨亮);  Qi JT(齐俊桐);  Xia Y(夏泳)
  |  收藏  |  浏览/下载：14/0  |  提交时间：2014/12/29
Optimum design of laser encoding and decoding on laser beam-riding guidance (EI CONFERENCE) 会议论文  OAI收割
2nd International Conference on Frontiers of Manufacturing and Design Science, ICFMD 2011, December 11, 2011 - December 13, 2011, Taichung, Taiwan
作者:  Yang L.;  Yang L.
收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25
Operating principle of laser beam-riding guidance was set forth. Based on the principle of spatial frequency-encoding  experimental results demonstrated that the receiver can receive correctly the encoded signal and can decode the signal  an optimum laser encoding mode was designed  measurement for the missdistance is feasible and all the performance parameters satisfy the demand. (2012) Trans Tech Publications  which can transfer continuous laser into pulse laser that represents different position information. Then the mathematic model of deviation from target is built  Switzerland.  a modified encoding pattern was presented  which is composed of two light paths crossed 90. Azimuth information of target is given in orthogonal coordinate system and deviation from target is linearity. As well as  characteristic distribution of spatial laser field is analyzed. Corresponding decoding mode was presented  by testing in 2 kilometers outdoor  
Mathematic model of solid fraction during rheo-casting by the cooling sloping plate process 期刊论文  OAI收割
ACTA METALLURGICA SINICA-ENGLISH LETTERS, 2012, 卷号: 25, 期号: 1, 页码: 81-88
作者:  Guan Renguo;  Zhao Zhanyong;  Huang Hongqian;  Zhang Qiusheng;  Liu Chunming
  |  收藏  |  浏览/下载：10/0  |  提交时间：2021/02/26
Design of motion adjusting system for space camera based on ultrasonic motor (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
作者:  Sun Z.
收藏  |  浏览/下载：83/0  |  提交时间：2013/03/25
Drift angle is a transverse intersection angle of vector of image motion of the space camera. Adjusting the angle could reduce the influence on image quality. Ultrasonic motor (USM) is a new type of actuator using ultrasonic wave stimulated by piezoelectric ceramics. They have many advantages in comparison with conventional electromagnetic motors. In this paper  some improvement was designed for control system of drift adjusting mechanism. Based on ultrasonic motor T-60 was designed the drift adjusting system  which is composed of the drift adjusting mechanical frame  the ultrasonic motor  the driver of Ultrasonic Motor  the photoelectric encoder and the drift adjusting controller. The TMS320F28335 DSP was adopted as the calculation and control processor  photoelectric encoder was used as sensor of position closed loop system and the voltage driving circuit designed as generator of ultrasonic wave. It was built the mathematic model of drive circuit of the ultrasonic motor T-60 using matlab modules. In order to verify the validity of the drift adjusting system  was introduced the source of the disturbance  and made simulation analysis. It designed the control systems of motor drive for drift adjusting system with the improved PID control. The drift angle adjusting system has such advantages as the small space  simple configuration  high position control precision  fine repeatability  self locking property and low powers. It showed that the system could accomplish the mission of drift angle adjusting excellent. 2011 SPIE.  
Research on model reference sliding mode control in roll stabilization of aerocraft (EI CONFERENCE) 会议论文  OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Chu H.-R.
收藏  |  浏览/下载：37/0  |  提交时间：2013/03/25
Aimed at aerospace roll stabilization  control arithmetic based on model reference sliding mode variable structure theory and chattering reduction arithmetic are formulated. Correctness and validity of arithmetic are analyzed. With flight dynamics  the roll-loop mathematic model and reference model are established. Sliding hyperplane is deduced based on model reference sliding mode variable structure theory. Combing with reaching law  control law is derived  and stability of roll-loop is analyzed. Chattering of aileron instructions is alleviate by using boundary layer approach. Digital flying simulation result shows that variable structure control arithmetic realized roll stabilization control  the roll angle is less than 5.3 under powered flight  and that of unpowered flight is less than 0.5  respectively. The command fin angle is less than 1.5. High frequency chattering of fin command nearby the minimum velocity was trailed off by chattering reduction arithmetic. The sliding mode control arithmetic show good performance when aerodynamic coefficients varies 20%. The control arithmetic is easy to be implemented for its simplicity. 2011 IEEE.  
Research on computer control strategy for optical electric tracking system (EI CONFERENCE) 会议论文  OAI收割
2011 IEEE International Conference on Mechatronics and Automation, ICMA 2011, August 7, 2011 - August 10, 2011, Beijing, China
作者:  Li M.
收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25
In this paper  mathematic model and computer control strategy for optical electrical tracking system have been researched and discussed. First  the system's structure and its work process have been analyzed. Second  according to the system's moving law  the system's mathematic model has been built. As to the computer control strategy  trigger guiding  two closed loop PID control method as well as compound control method have been applied to satisfy the tracking accuracy. Third  we apply the bilinear transformation to get the digital system  and the sample time is 800Hz. The simulation results indicate that the maximum tracking error can be limited to less than 0.5 and the regulator time can be 0.04s. Then the control project resonance frequency should be more than 200Hz and the sample frequency should be more than 400Hz to meet the control accuracy requirement. So we can conclude that the system indexes such as swiftness  high accuracy as long as real time have been satisfied. And the requirement of mechanical property has been present which is very useful to mechanical working. 2011 IEEE.  
Aerospace reconnaissance distributed system design based on WES (EI CONFERENCE) 会议论文  OAI收割
2nd International Conference on e-Business and Information System Security, EBISS2010, May 22, 2010 - May 23, 2010, Wuhan, China
作者:  Wang H.;  Wang H.;  Wang H.;  Wang H.
收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25