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Object detection for ochotona curzoniae based on semantic segmentation 期刊论文
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition), 2020, 卷号: 48, 期号: 7, 页码: 7-12
作者:  Chen, Haiyan;  Chen, Gangqi
收藏  |  浏览/下载：12/0  |  提交时间：2020/11/14
Position and orientation best-fitting based on deterministic theory during large scale assembly 期刊论文
JOURNAL OF INTELLIGENT MANUFACTURING, 2018, 卷号: 29, 页码: 827-837
作者:  Chen, Zhehan;  Du, Fuzhou;  Tang, Xiaoqing
收藏  |  浏览/下载：3/0  |  提交时间：2019/12/30
Field testing of earth pressures in a large-scale natural loess slope 期刊论文
KSCE Journal of Civil Engineering, 2018, 卷号: 22, 期号: 7, 页码: 2266-2273
作者:  Kong, Yang;  Ruan, Huai-Ning;  Huang, Xue-Feng;  Zhu, Zhen-de
收藏  |  浏览/下载：30/0  |  提交时间：2020/11/14
The numerical study of transient flow in rotor and stator cascades of solid-liquid two-phase flow 会议论文
Wuhan, China, October 22, 2014 - October 25, 2014
作者:  Han, Wei;  Yue, Ting;  Li, Rennian;  Jin, Yi;  Lei, Jiang
收藏  |  浏览/下载：22/0  |  提交时间：2020/11/15
Research on uncertainty in measurement assisted alignment in aircraft assembly 期刊论文
CHINESE JOURNAL OF AERONAUTICS, 2013, 卷号: 26, 页码: 1568-1576
作者:  Chen Zhehan;  Du Fuzhou;  Tang Xiaoqing
收藏  |  浏览/下载：5/0  |  提交时间：2020/01/06
Design and experimental research of a new type focus mechanism used in space-based telescope (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
Wang D.; Jia X.
收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25
The position of focal plane will be changed because of temperature fluctuation and vacuum environment. In order to make the telescope work well  positioning accuracy of the mechanism is 0.008mm. The performance satisfies the need of precision  a focusing mechanism is needed. To majority of large space-based telescopes  and the scheme design is reasonable and practicable. 2012 IEEE.  the general way to do this would be to use a reflector  which was located in the backfocal distance. One of typical schemes of this mechanism was introduced  however  because of the big axial size  the mechanism can't be used when the size of the enclosure was limited. A new type of focusing mechanism was introduced  which has such advantages of small size  high accuracy and low mass. The design and test methods had been discussed. According to the results  the repeatability positioning accuracy is 0.0025mm  
Position and size effects on voids growth in nonlinear elasticity 其他
2012-01-01
Lian, Yijiang; Li, Zhiping
收藏  |  浏览/下载：4/0  |  提交时间：2015/11/10
Design of motion compensation mechanism of satellite remote sensing camera (EI CONFERENCE) 会议论文
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Gu S.; Yan Y.; Xu K.; Jin G.
收藏  |  浏览/下载：40/0  |  提交时间：2013/03/25
With the development of aerospace remote sensing technology  the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures  the target image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera  the image motion had to be compensated. In order to abate the effect of image motion to image quality of space camera and improve the resolution of the camera  the compensation method of image motion to space camera is researched. First  the reason of producing drift angle and adjustment principle are analyzed in this paper. This paper introduce the composition and transmission principle of image motion compensation mechanism. Second  the system adopts 80C31 as controller of drift angle  and adopts stepping motor for actuators  and adopts absolute photoelectric encoder as the drift Angle measuring element. Then the control mathematical model of the image motion compensation mechanism are deduced  and it achieve the closed-loop control of the drift angle position. At the last  this paper analyses the transmission precision of the mechanism. Through the experiment  we measured the actual precision of the image motion compensation mechanism  and compared with the theoretical analysis. There are two major contributions in this paper. First  the traditional image motion compensation mechanism is big volume and quality heavy. This has not fit for the development trend of space camera miniaturization and lightweight. But if reduce the volume and quality of mechanism  it will bring adverse effects for the precision and stiffness of mechanism. For this problem  This paper designed a image motion compensation that have some advantages such as small size  light weight at the same time  high precision  stiffness and so on. This image motion compensation can be applicable to the small optics cameras with high resolution. Second  the traditional mechanism control need to corrected  fitting and iterative for the control formula of mechanism. Only in this way  we can get the optimal control mathematical model. This paper has high precision of the control formula derived. It can achieve the high precision control without fitting  It also simplify the difficulty of control mathematical model establishment. This paper designed the range of adjusting of image motion compensation mechanism between -5 +5. Based on choosing-5  -4  -3  -2  -1  0  +1  +2  +3  +4  +4 as the expectation value of the imaginary drift angle  we get ten groups of the fact data in adjusting drift angle measured. The test results show that the precision of the drift angle control system can be achieved in 1. It can meet the system requirements that the precision of the control system is less than 3'  and it can achieve the high-precision image motion compensation. 2011 SPIE.  
Most-unstable wave method for inlet conditions of large eddy simulations of spatially developing channel flows 期刊论文
2010, 2010
Ren Kaifeng; Zhang Huiqiang; Wang Xilin
收藏  |  浏览/下载：4/0
Miniaturize photoelectric stable platform (EI CONFERENCE) 会议论文
2010 International Conference on Computer Application and System Modeling, ICCASM 2010, October 22, 2010 - October 24, 2010, Shanxi, Taiyuan, China
Xue W.-Q.; Wang Y.-Y.; Dai M.
收藏  |  浏览/下载：39/0  |  提交时间：2013/03/25
In order to reduce the size and weight of the gimbal in a traditional stable platform and correct the disadvantage in size of the payload  the paper first improves the gimbal which is an important component of a stable photoelectric platform  that also is an important factor in affecting the size and weight of a stability platform. In this paper  a closed-form solution of 3-DOF manipulator is designed according mechanical arm design principles. This manipulator is formed by a three joint axes whose extended line is intersected at one point. A standard orthogonal coordinate system is set up for each rod in the manipulator. And then  rotation transformation matrix expression is obtained. At last in this paper  the manipulator arm-shaped method for solving solutions is description  and also  each parameter of the gimbal is calculated when the photoelectric detection devices at bottom reach the expected position. Test results show that the photoelectric stability platform with gimbal we designed is smaller  lighter and simpler than that traditional. Also  the packaging and size of the photoelectric will not be affected with this open structure. 2010 IEEE.  

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