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Improved equations of ground pressure for shallow large-diameter shield tunnel considering multiple impact factors 期刊论文  OAI收割
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 2023, 卷号: 138, 期号: -, 页码: -
作者:  
Cui, Lan;  Yang, Wenyu;  Zheng, Junjie;  Sheng, Qian
  |  收藏  |  浏览/下载:22/0  |  提交时间:2023/08/02
Large-Scale Landslide Displacement Rate Prediction Based on Multi-Factor Support Vector Regression Machine 期刊论文  OAI收割
APPLIED SCIENCES-BASEL, 2021, 卷号: 11, 期号: 4, 页码: 14
作者:  
Li, Xiuzhen;  Li, Shengwei
  |  收藏  |  浏览/下载:24/0  |  提交时间:2021/12/16
Applications and development of micro- or nano-metric multi degree of freedom adjusting displacement scaling mechanisms for primary mirror 会议论文  OAI收割
Xian, PEOPLES R CHINA, 2020-10-15
作者:  
Hu, Bin;  Li, Chuang;  Zhu, Qing;  Ye, Jing
  |  收藏  |  浏览/下载:36/0  |  提交时间:2021/07/23
Research on Large Caliber FSM Digital Control System Based on Voice Coil Motor 会议论文  OAI收割
Chengdu, China, 2019-12-20
作者:  
Cao, Yu;  Wang, Haitao;  Lv, Tao;  Wang, Rui;  Jing, Feng
  |  收藏  |  浏览/下载:73/0  |  提交时间:2020/03/23
Context-adaptive matching for optical flow 期刊论文  OAI收割
MULTIMEDIA TOOLS AND APPLICATIONS, 2019, 卷号: 78, 期号: 1, 页码: 641-659
作者:  
Bao, Xiuguo;  Zu, Yueran;  Gao, Ke;  Wang, Yanyang;  Tang, Wenzhong
  |  收藏  |  浏览/下载:35/0  |  提交时间:2019/04/03
Lightweight design of large scale theodolite's turntable based on topology optimization of continuum structure (EI CONFERENCE) 会议论文  OAI收割
2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China
作者:  
Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.
收藏  |  浏览/下载:28/0  |  提交时间:2013/03/25
In order to solve the problem that the weight of large scale theodolite's casting or steel plate welded structure is too heavy  lightweight design of large scale turntable based on topology optimization of continuum structure is investigated. Topology optimization could have better optimization efficiency because it can provide the optimized distribution of material and gain optimized structure in conceptual design phase of the structural design. In order to obtain lightweight and high stiffness structure  a truss turntable based on topology optimization of continuum structure is presented  and the validity of this lightweight structure is examined by finite element analysis. Comparing to the traditional welding steel turntable  the lightweight turntable  without changing the static displacement  can lose 386.48 kg(lightweight ratio is 26.7%)  and its first-order natural frequency raises from 167.02Hz to 173.71Hz. Meanwhile  in other aspects this turntable also has better performance than traditional structure. 2012 IEEE.  
Gimbal displacement error analysis on an electro-optical seeker (EI CONFERENCE) 会议论文  OAI收割
Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China
作者:  
Zhang X.;  Zhang X.;  Zhang X.
收藏  |  浏览/下载:35/0  |  提交时间:2013/03/25
It is essential to analyze the gimbal displacement errors for a seeker due to the importance for cueing of targets and tracking for the final approach. Otherwise  for a seeker electro-driven with a concentric glass dome  the large errors will decrease the picking  pointing  and tracking precision rooted from the displacement errors existing between the rotation center of the optical system and the gimbal. And the gimbaled camera system displacement errors are never eliminated but reduced due to the geometric errors consists of geometric tolerances of gimbal structure  manufacture  installation and vibration coming from working environment. In this paper  the gimbal displacement errors in an electro-optically stabilized platform resulting from geometric errors and environment errors were analyzed and shown in detail. The mathematical modal of the gimbal displacement errors created based on multi-body dynamics demonstrated the connection between the gimbal displacement errors and the stabilized platform. Taking a visible light image seeker as a case  the diameter is 120mm  and the geometric tolerances came from the values of primary design and the vibration data came from the environmental vibration test on the pitch-yaw seeker  and at the same time  the errors resulting from installation were considered too. Based on calculating  the maximum gimbal displacement error will reach to 0.2mm for pitching angle smaller than 40 and yawing angle smaller than 60. However  the critical parts have been found out according to the probability theory and the reliability analysis successfully used in the paper  and finally  the maximum gimbal displacement error reduced to 0.1mm  which is acceptable corresponding to the picking  pointing and tracking precision for an optical imaging seeker. 2010 Copyright SPIE - The International Society for Optical Engineering.