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X-ray image defect recognition method for pipe weld based on improved convolutional neural network
期刊论文
Hanjie Xuebao/Transactions of the China Welding Institution, 2020, 卷号: 41, 期号: 1, 页码: 7-11
作者:
Fan, Ding
;
Hu, Ande
;
Huang, Jiankang
;
Xu, Zhenya
;
Xu, Xu
收藏
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浏览/下载:26/0
  |  
提交时间:2020/11/14
Chemical activation
Convolution
Convolutional neural networks
Defects
Extraction
Feature extraction
Image enhancement
Image recognition
Pixels
Welds
Activation functions
Convolution neural network
Local information
Network parameters
Recognition accuracy
Region of interest
Saturation region
Segmentation algorithms
Cramér Rao Lower Bound Derivation of Parameter Estimation for Hypersonic Platform SAR-GMTI
会议论文
International Conference on Signal Processing Proceedings, ICSP, 2018-08-12
作者:
Zhou, R.
;
Zhao, Q.
;
Zhang, L.
;
Sun, J.
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浏览/下载:65/0
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提交时间:2019/12/30
Probability density function
Radar target recognition
Signal processing
Synthetic aperture radar
Accuracy of parameters
CRLB
Ground moving target indication
Interferometric phase
Joint probability density function
Multichannel
Radial velocity estimation
Signal-to-clutter ratios
Parameter estimation
Investigation on Stretch Forming Process of Thick Double-Curved Aluminium Alloy component
会议论文
Journal of Physics: Conference Series
作者:
Fang, T.
;
Xiaoxing, L.
;
Yulong, G.
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  |  
浏览/下载:5/0
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提交时间:2019/12/30
Industrial research
Metal forming
Numerical models
Sheet metal
Aircraft panels
Aluminium panels
Double curvature
High-accuracy
Manufacturing process
Optimization of process parameters
Stretch-forming
Process design
Research on Reduction Method for Measurement by Hot Wire Anemometer on Non-Calibrated Conditions [热线风速仪非标定工况下测试修正方法研究]
期刊论文
Tuijin Jishu/Journal of Propulsion Technology, 2018, 卷号: 39, 页码: 2094-2101
作者:
Zhang, Y.-W.
;
Quan, Y.-K.
收藏
  |  
浏览/下载:7/0
  |  
提交时间:2019/12/30
Flow velocity
Forced convection
Heat conduction
Heat radiation
Pressure
Temperature
Velocity measurement
Wire
Accuracy of measurements
Application range
Heat transfer model
Hot wire anemometers
Literature data
Physical property parameters
Reduction method
Temperature and pressures
Anemometers
A parameter correction algorithm for PTZ camera based on parameter refinement strategy and hierarchical feature matching
期刊论文
Guangdianzi Jiguang/Journal of Optoelectronics Laser, 2015, 卷号: 26, 期号: [db:dc_citation_issue], 页码: 1997-2007
作者:
Cui, Zhi-Gao
;
Li, Ai-Hua
;
Wang, Tao
;
Xu, Bin
;
Cai, Yan-Ping
收藏
  |  
浏览/下载:6/0
  |  
提交时间:2019/12/02
Accuracy of parameters
Hierarchical feature matching
Hierarchical matching
Pan-tilt-zoom camera
Parameter correction
Parameter refinement
PTZ camera
Surveillance systems
Interpolation algorithms based on Rife-Vincent window for discrete Fourier transforms of damped signals
期刊论文
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering, 2015, 卷号: 51, 期号: [db:dc_citation_issue], 页码: 1-7
作者:
Diao, Ruipeng
;
Meng, Qingfeng
;
Fan, Hong
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  |  
浏览/下载:5/0
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提交时间:2019/12/02
Accuracy of parameters
Frequency deviation
Frequency domain interpolation
Interpolation algorithms
Maximum sidelobe decay
Parameter estimation errors
Picket fence effects
Spectral leakage
Structural design of primary mirror subassembly for space telescope (EI CONFERENCE)
会议论文
2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan
Xu H.
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浏览/下载:49/0
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提交时间:2013/03/25
In order to design a large aperture primary mirror with the diameter of 1150 mm
the parameters impacting on gravity deformation of the mirror were analyzed and discussed in detail
including material selection
diameter-thickness ratio
the number of the support points
location selection and lightweight structure
etc. A novel space mirror structure system was put forward
and its back was opened and supported by six points on back. The dynamic and static and thermal characteristics were analyzed based on the finite element method. Analysis results showed the surface figure accuracy reached to RMS 14.5nm under the action of gravity load along the optical axis direction and the first-order natural frequency was 214Hz which met to the designed indexes requirements. (2013) Trans Tech Publications
Switzerland.
Structural design of large aperture rectangular mirror for space telescope (EI CONFERENCE)
会议论文
2nd International Conference on Civil Engineering and Transportation, ICCET 2012, October 27, 2012 - October 28, 2012, Guilin, China
Li Z.
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浏览/下载:28/0
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提交时间:2013/03/25
Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness
strength and thermal dimensional stability
some factors such as support scheme
materials selection
lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge
influences of gravity
assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5C uniform temperature rise respectively
the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz
which shows an error less than 5% compared to FEA results. (2013) Trans Tech Publications
Switzerland.
An iterative interpolation FFT method based on long-range leakage compensation
期刊论文
Zhendong yu Chongji/Journal of Vibration and Shock, 2013, 卷号: 32, 期号: [db:dc_citation_issue], 页码: 1-6
作者:
Diao, Rui-Peng
;
Meng, Qing-Feng
收藏
  |  
浏览/下载:2/0
  |  
提交时间:2019/12/03
Accuracy of parameters
Discrete fourier transformation
Estimating parameters
Fast convergence rate
Generation principles
Interpolation schemes
Leakage compensation
Long-range leakage
Analyzing the Accuracy of the Binocular Stereo Locating System for Meridian Visualization
会议论文
作者:
Lin, Xuehua
;
Chen, Xin
收藏
  |  
浏览/下载:3/0
  |  
提交时间:2019/11/21
meridian visualization
binocular stereo vision
structural parameters
effective field of view
positioning accuracy
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