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Journal Article 5

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2020 2

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Buffeting response 1

Flutter derivatives 1

Reynolds number effect 1

Sutong cable-stayed bridge 1

System identification 1

Turbulence effect 1

deep static water environment 1

dolomite 1

dynamic properties 1

exploration of cutoff boundary of bicarbonate 1

flutter derivatives 1

gravity second derivative 1

suitsble system 1

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An improved ROF denoising model based on time-fractional derivative Research Articles

Xing-ran Liao,xrliao_scu@163.com

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 6, Pages 809-962 doi: 10.1631/FITEE.2000067

Abstract: ., Caputo-like difference is applied to discretize the ).

Keywords：改进ROF去噪模型；时间分数阶导数；Caputo导数；图像去噪

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Multi-focus image fusion based on fractional-order derivative and intuitionistic fuzzy sets Research Articles

Xue-feng Zhang, Hui Yan, Hao He,zhangxuefeng@mail.neu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 6, Pages 809-962 doi: 10.1631/FITEE.1900737

Abstract: Multi-focus is an increasingly important component in , and it plays a key role in imaging. In this paper, we put forward a novel multi-focus method which employs and . The original image is decomposed into a base layer and a detail layer. Furthermore, a new fractional-order spatial frequency is built to reflect the clarity of the image. The fractional-order spatial frequency is used as a rule for detail layers fusion, and are introduced to fuse base layers. Experimental results demonstrate that the proposed fusion method outperforms the state-of-the-art methods for multi-focus .

Keywords：像融合；分数阶导数；直觉模糊集；多聚焦图像

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Investigation of Turbulence Effects on the Aeroelastic Properties of a Truss Bridge Deck Section

Hoang Trong Lam, Hiroshi Katsuchi, Hitoshi Yamada

Engineering 2017, Volume 3, Issue 6, Pages 845-853 doi: 10.1016/j.eng.2017.10.001

Abstract:

This paper presents the flutter derivatives (FDs) extracted from a stochastic system identification (SSI) method under different turbulent flows. The objective of the study is to investigate the effects of oncoming turbulence on the flutter of suspended long-span bridges using a section model wind-tunnel test. Several wind-tunnel tests were performed on a truss bridge deck section with different oncoming turbulent properties involving reduced turbulence intensities and turbulent scales. This study includes an investigation of the effect of oncoming flows on modal dynamic responses. The transient and buffeting response data from the wind-tunnel test are analyzed using the system identification technique in extracting FDs, and the difficulties involved in this method are discussed. The time-domain SSI is applied to extract all FDs simultaneously from one and two degree-of-freedom (1DOF and 2DOF) systems. Finally, the results under different conditions are discussed and conclusions are formed.

Keywords： Flutter derivatives System identification Turbulence effect Buffeting response

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Aerodynamic problems of cable-stayed bridges spanning over one thousand meters

Chen Airong,Ma Rujin,Wang Dalei

Strategic Study of CAE 2009, Volume 11, Issue 3, Pages 31-37

Abstract:

Aerodynamic problems of super long span cable-stayed bridge are investigated based on Sutong Bridge.Dynamic properies, wind loading, identification of flutter derivatives based on full aeroelastic bridge model, logitudinal structural system and vortex excited vibration are mainly focused on. Researches show that vertical stiffiness will decrease with wind speed if the nonlinearity of deformation of stay cables under later wind loading is considered. It is also found that Fixed - Fixed system is the most suitable for long span cable stayed bridge under logitudinal wind loading. Identification method of flutter derivatives through full aeroelastic bridge model is proposed. In the end, some discussions on vortex excited vibration and Rehnilds number effect are intoduced.

Keywords： Sutong cable-stayed bridge dynamic properties suitsble system Reynolds number effect flutter derivatives

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Theory and methods of expanding cutoff boundary of Tongbai Anpeng bicarbonate mine

Wang Shengli,Qi Tiexin,Liu Jianzhong,Li Shanling,Dong Feng,Li Shougang,Zhang Shaoyu,Wang Shangxing

Strategic Study of CAE 2010, Volume 12, Issue 2, Pages 52-56

Abstract:

This paper presents the exploration process of expanding cutoff boundary of Tongbai Anpeng bicarbonate mine, and put forward the basic principles of exploring cutoff boundary of mirabilite mine and applied theory, technology and methods of exploring cutoff boundary. This theory, technology, methods are attested practical, the results of expanding cutoff boundary are basically consistent with the development, and thus provided the basis for bicarbonate production and continuing expansion, reducing unnecessary waste and costs.

Keywords： deep static water environment exploration of cutoff boundary of bicarbonate gravity second derivative dolomite