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长春光学精密机械与... [39]
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会议论文 [39]
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专题:长春光学精密机械与物理研究所
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Application of interferometry measurement in large-scale optic-electrical theodolite (EI CONFERENCE)
会议论文
2012 International Conference on Sensors, Measurement and Intelligent Materials, ICSMIM 2012, December 26, 2012 - December 27, 2012, Guilin, China
Zhao N.
;
Sun Z.
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浏览/下载:22/0
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提交时间:2013/03/25
Interferometry is a very important method in high accuracy measurement for optical system. This article briefly introduced the conception of interferometry and took a product of 4D Technology as an example to carry on the measurement. A large-scale optic-electrical Theodolite in assemblage was measured
and its primary mirror was 400mm in diameter. With the analysis of the results
some micro adjustments of the mechanical structure proceed
and it made the system perform better. The final results of the whole system is 1.061 in P-V value and 0.1136 in RMS value (=632.8nm)
this meets the demand of optical design and practical application. The result demonstrates that interferometry is a good way to be utilized and optimize in the procedure of assemble. (2013) Trans Tech Publications
Switzerland.
Engineering analysis and research on connection plate of vehicle radar antenna pedestal (EI CONFERENCE)
会议论文
3rd International Conference on Frontiers of Manufacturing and Design Science, ICFMD 2012, December 11, 2012 - December 13, 2012, Hong kong
Chang F.
;
Li Y.
;
Yan D.
;
Sun H.
;
Wu Y.
;
Tian X.
收藏
  |  
浏览/下载:22/0
  |  
提交时间:2013/03/25
According to the usage of vehicle radar antenna pedestal connection plate
this article analyzes and compares the structure characteristic of welding and casting. We decide to adopt the casting structure and use cast aluminium ZL101A. Based on the connection plate of using conditions
we analyze the deformation and stress of connection plate by the finite element analysis software. The design is in line with the material allowable requirements and to meet the requirements of the system stiffness. (2013) Trans Tech Publications
Switzerland.
The approximate calculation of atmospheric path radiance in close range and horizontal direction (EI CONFERENCE)
会议论文
2012 International Conference on Sensors, Measurement and Intelligent Materials, ICSMIM 2012, December 26, 2012 - December 27, 2012, Guilin, China
Chang S.
;
Zhao N.
;
Sun Z.
;
Zhang Y.
;
Chen Y.
收藏
  |  
浏览/下载:24/0
  |  
提交时间:2013/03/25
Atmospheric path radiance is the key factor in the accuracy of objective radiation measurement. In the traditional radiation character measurements
it is compared with the results of MODTRAN and measurement in experiment. It is revealed that the accuracy of software is 7.8%
under the help of the atmospheric observation equipment
and the formula is 4.9%
MODTRAN and other software likewise
which could demonstrate the validity of the pproximate calculation formula in close range and horizontal direction. In this article
the indeterminacy rate could be around 10~20%
in the process of deducing and experiment
it is highly restricts the measurement accuracy of objective radiation. For this reason
the validity of the approximate calculation formula in close range and horizontal direction is fully proved
it is quite significant to develop the study of measure and calculation in path radiance. The approximate calculation formula for path radiance in close range and horizontal direction is expressed in this article
which supply a new method in approximate calculation of path radiance for objective radiation measurement. (2013) Trans Tech Publications
Switzerland.
Research on the key technology of ATP system for free space optical communication (EI CONFERENCE)
会议论文
31st Chinese Control Conference, CCC 2012, July 25, 2012 - July 27, 2012, Hefei, China
Meng H.
;
Liu X.
;
Zhang B.
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浏览/下载:12/0
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提交时间:2013/03/25
Free space optical communication is the bidirectional transmission technology that puts to use the laser beam as a carrier in space. Free space optical communication is generally used in the severe space environment. It is the mainly problem that the narrow beam of laser beam is high-precision aimed.
and it is became very important that the technology of ATP is researched. Performance of the ATP system directly affects the performance of the quality of the free space optical communication. So research of the ATP is the key technology in FSO
and this technology is discussed and analysed in the article. 2012 Chinese Assoc of Automati.
A servo control system of dynamic target simulation device for aerial camera (EI CONFERENCE)
会议论文
2nd International Conference on Advanced Design and Manufacturing Engineering, ADME 2012, August 16, 2012 - August 18, 2012, Taiyuan, China
Ji Q.
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浏览/下载:21/0
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提交时间:2013/03/25
This article introduces a dynamic target simulation device to evaluate dynamic image quality of the aerial camera. The device simulated the positional relationship of the sky and ground in the laboratory when aerial camera flies at high altitude. And it can be used to inspect camera image quality of aerial camera flying at high altitude in laboratory. At a same time
the article focuses on this servo control system of device
building a control model
and giving control strategy. The servo control system was proved stably and reliably after experimental verification. And it provides a strong guarantee for the test of the dynamic image. (2012) Trans Tech Publications
Switzerland.
Application of adaptive enhancement means in head and neck CR image (EI CONFERENCE)
会议论文
2012 3rd International Conference on Information Technology for Manufacturing Systems, ITMS 2012, September 8, 2012 - September 9, 2012, Qingdao, China
Zhang M.-H.
;
Zhang Y.-Y.
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浏览/下载:23/0
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提交时间:2013/03/25
Digital CR of head and neck overcomes the disadvantage of regular X-ray radiography
which can not reveal bone and soft tissue position deficiency in one exposing
and reduces the Xray radiation dose. Meanwhile
various factors cause the decline of image quality
and images must be enhanced in order to meet demands of doctor's clinical diagnosis. The general enhancement algorithms don't consider body's structure differences and density characteristics. A new adaptive CR enhancement algorithm was proposed in this article
and head and neck CR images were processed with this method and compared with linear unsharp masking method. The experiment proves that the details of CR image enhanced were abundant and enhanced CR image had good visual effect
SNR was high
as well as detail variance /background variance (DV/BV) indicating that this algorithm is suitable for head and neck CR medical images. (2012) Trans Tech Publications
Switzerland.
The research of round raster readheads scheme (EI CONFERENCE)
会议论文
3rd international Conference on Manufacturing Science and Engineering, ICMSE 2012, March 27, 2012 - March 29, 2012, Xiamen, China
Cong J.-F.
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浏览/下载:24/0
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提交时间:2013/03/25
The round raster is extensively applied in all kinds of high accuracy angular displacement measurement and control system. With the development of precise mechanotronics measuring instrument
machining center
CNC machine and various precise location testing technology
a higher request is put forward to the accuracy and the function of raster measurement system. In this article it is concluded that double readheads is the most reasonable configuration scheme through tests of single readhead scheme
two readheads and four readheads. (2012) Trans Tech Publications.
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
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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
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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
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提交时间:2013/03/25
The reliability flight property has received much attention within the aircraft control community throughout the last decades. In this paper
the fault-tolerant control technique is introduced into the attitude stability control system of a quadrotor UAV in order to compensate the influence of the actuators fault of the aircraft. This control scheme is composed of two components: a robust fault detection module using the modelbased observation approach and a reconfigurable controller. Besides the designing procedure
the theoretical analysis of robustness and stability of the designed FTC scheme are also contained in this article. And finally
the availability of the proposed scheme is verified through numerical simulation. 2012 IEEE.
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