中国科学院机构知识库网格系统: 检索

Research status and prospect of plate elements in absolute nodal coordinate formulation 期刊论文 OAI收割
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART K-JOURNAL OF MULTI-BODY DYNAMICS, 2022, 页码: 1-11
作者: Zhang ZW(张赵威); Ren W(任武)

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收藏 | 浏览/下载：36/0 | 提交时间：2022/05/15

Absolute nodal coordinate formulation dynamics of flexible multibody systems plate element locking problem dynamic modeling

集成电路显微图像大面积缺陷修补技术研究 学位论文 OAI收割
工程硕士, 中国科学院自动化研究所: 中国科学院大学, 2014
胡敏

收藏 | 浏览/下载：78/0 | 提交时间：2015/09/02

集成电路图像修补薄板样条病态条件问题图像拼接 Integrated Circuit Image Inpainting Thin Plate Spline Ill-conditioned Problem Image Mosaics

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.

Integral Transform Methods for Inverse Problem of Heat Conduction with Known Boundary of a Thin Rectangular Object and its Stresses 期刊论文 OAI收割
JOURNAL OF THERMAL SCIENCE, 2012, 卷号: 21, 页码: 459,465
Navneet K. Lamba; N. W. Khobragade

收藏 | 浏览/下载：23/0 | 提交时间：2013/01/31

Thin rectangular plate three dimensional inverse transient thermoelastic problem Marchi- Fasulo transform and Laplace transform.

A NOTE ON THE NONCONFORMING FINITE ELEMENTS FOR ELLIPTIC PROBLEMS 期刊论文 OAI收割
JOURNAL OF COMPUTATIONAL MATHEMATICS, 2011, 卷号: 29, 期号: 2, 页码: 215-226
作者: Gao, Boran; Zhang, Shuo; Wang, Ming

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收藏 | 浏览/下载：22/0 | 提交时间：2018/07/30

Nonconforming finite element Elliptic boundary value problem Plate bending problem

Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang J.; Zhang J.; Zhang J.; Shi G.; Zhang X.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus which means the system MTF is quite insensitive to defocus and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.

Research of improving the accuracy of license plate character segmentation (EI CONFERENCE) 会议论文 OAI收割
5th International Conference on Frontier of Computer Science and Technology, FCST 2010, August 18, 2010 - August 22, 2010, Changchun, China
作者: Zhu Y.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

In order to improve the accuracy of license plate character segmentation use line-shape filter to remove plate frames. Then character segmentation approach combines projection and inherent characteristics of character this paper strengthens preprocessings before segmentation. In character binarization can better solve character adhesion and fracture problem. For tilted characters only in horizontal direction use improved Bemsen method to reduce noise interference even without tilt correction this method can achieve better segmentation. Experiment results shows the accuarcy of character segmentation reaches 97%. 2010 IEEE.

Upwind compact finite difference scheme for time-accurate solution of the incompressible Navier-Stokes equations 期刊论文 OAI收割
APPLIED MATHEMATICS AND COMPUTATION, 2010, 卷号: 215, 期号: 9, 页码: 3201-3213
作者: Shah, Abdullah; Yuan, Li; Khan, Aftab

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收藏 | 浏览/下载：32/0 | 提交时间：2018/07/30

Incompressible Navier-Stokes equation Artificial compressibility method Upwind compact finite difference Flux-difference splitting Dual-time stepping Kovasznay flow problem Oscillating plate Taylor's decaying vortices Doubly periodic shear layer

Time reversal focusing of the initial state for Kirchhoff plate 期刊论文 OAI收割
SIAM JOURNAL ON APPLIED MATHEMATICS, 2008, 卷号: 68, 期号: 6, 页码: 1535-1556
作者: Phung, Kim Dang; Xu Zhang

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收藏 | 浏览/下载：18/0 | 提交时间：2018/07/30

Kirchhoff plate inverse problem quantitative unique continuation observability estimate time reversal technique

Nonconforming finite element analysis for a plate contact problem 期刊论文 OAI收割
SIAM JOURNAL ON NUMERICAL ANALYSIS, 2002, 卷号: 40, 期号: 5, 页码: 1683-1697
作者: Han, WM; Wang, LH

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收藏 | 浏览/下载：20/0 | 提交时间：2018/07/30

nonconforming finite element method elliptic variational inequality of fourth order plate frictional contact problem optimal order error estimate