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Software engineering, Social Network Analysis and Intelligent Computing (SSAIC), Asia-Pacific Conference on

作者： Hai Lin Xianshan Dong Wei Su Qinwen Huang Agam Tomar School of Mechanics and Construction Engineering Jinan University Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou China Faculty of Engineering and Mathematical Sciences University of Western Australia Australia

ISBN: (数字)9798350393682

ISBN: (纸本)9798350393699

In order to discuss the influence of the number of sheets on acceleration and frequency curve of sample surface, the finite element model of clamp, SOP sample and metal sheet is firstly established with Solidworks. Different number of sheets are laid on the surface of SOP sample. Then changing the number of the paper sheets, harmonic response analysis is converted based on modal analysis. The influence of different number of sheet on acceleration and frequency curve is discussed. The results show the relation between acceleration-frequency curve of different thickness of paper, which provides reference for packaging design.

关键词： Solid modeling Social networking (online) Modal analysis Metals Packaging Harmonic analysis Numerical simulation

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Application of MobilenetV3-Large model improved by transfer learning and CBAM Module in crack recognition and classification 10

Application of MobilenetV3-Large model improved by transfer ...

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10th Australasian Congress on Applied Mechanics, ACAM 2021

作者： Chen, Liujie Yao, Haodong Ng, Ching Tai Fu, Jiyang School of Civil Engineering Guangzhou University Guangdong Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Guangdong Guangzhou China School of Civil Environmental & Mining Engineering The University of Adelaide SA Australia Research Center for Wind Engineering and Engineering vibration Guangzhou University Guangdong Guangzhou China

ISBN: (纸本)9781925627596

Crack is an important indication for assessing the condition and safety of concrete structures. Quick and accurate crack feature extraction and classification performance of deep learning model are important in crack classification. Therefore, this study proposed a crack classification method based on the modified lightweight neural network. The proposed method uses MobileNetV3-Large pre-trained using an ImageNet dataset as backbone and then adopts the Convolution Block Attention Module (CBAM), which contains two modules, Channel Attention Module and Spatial Attention Module. Without increasing the number of model parameters, CBAM can strengthen the ability of the neural network in crack feature extraction. The image dataset of concrete structures for verifying the proposed method contains four different types of cracks: transverse cracks, vertical cracks, diagonal cracks, and irregular cracks. Other deep learning models, such as MobileNetV3-Large, VGG16, EfficentNetB0, GoogLeNet, Efficentnetv2-S, are also used for the crack classification in this study and the results are compared with those obtained by the proposed method. The results demonstrate that the proposed method has the best performance with the minimum training time at 100 images/s and prediction time at 47.6 images/s, Accuracy of 95.93%, Precision of 95.95%, Recall of 95.95%, and Macro-F1 of 96.20%. The results indicate that the proposed method can effectively improve the accuracy of crack recognition and classification. It can also strengthen the ability of the network in extracting the complex crack image features. The proposed method can be applied practically for automatic crack detection. © ACAM 2021. All rights reserved.

关键词： Concrete buildings

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The Effects of RF Power and Cavity Structure on the Plasma Discharge Characteristics of RPS

The Effects of RF Power and Cavity Structure on the Plasma D...

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Electronics and Devices, Computational Science (ICEDCS), International Conference on

作者： Hai Lin Wei Su Ming Chen Renhuai Liu School of Mechanics and Construction Engineering Jinan University Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Guangzhou China

In this paper, a two-dimensional model of plasma diffusion in remote plasma source discharge chamber is established by COMSOL plasma module. The electron density and electron temperature distributions inside the discharge cavity were obtained by adjusting the thickness of alumina coating and the magnitude of RF power parameters. Based on the results, the authors discuss the effects of different alumina coating thickness and RF power on the electron density and electron temperature inside the discharge cavity, which provide theoretical guidance for the subsequent optimization of the internal structure of the discharge cavity and the discharge parameters.

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Flexural Performance of Layered Macro Fiber Reinforced Concrete Short Beams

SSRN

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SSRN 2022年

作者： Yuan, Hong Fu, Xiao-Hui Fan, Ya-Chen Fu, Bing Zou, Qi-Qi School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518055 China

Fiber-reinforced polymer (FRP) composites have been increasingly used in various sectors, which inevitably results in an increasing amount of FRP waste to be dealt with. A recent study conducted by the author’s group explored a novel mechanical recycling method to process GFRP waste into small slender elements (referred to as "macro fibers") for reinforcing concrete, leading to so called "macro fibre reinforced concrete" (i.e., MFRC). The macro fibres recycled from waste FRP composites bridge the cracks in concrete and mitigate their development, thus enhancing the flexural strength and toughness of MFRC flexural members. However, the macro fibres have a negligible effect on the compressive properties of MFRC, which implies that the macro fibres in the compressive zone cannot be efficiently utilized. As motivated by the concept of the layered structure, this paper presents an experimental investigation on the flexural performance of the layered beams with the MFRC bottom layer and PC (plain concrete) top layer, expecting to improve the utilization of the incorporated macro fibres. The investigated test parameters include the height of the bottom layer as well as the macro fiber content in the bottom layer. The test results show that the application of layer structure effectively enhances the utilization of macro fibers and hence promotes the future technological application of the proposed mechanical recycling method. © 2022, The Authors. All rights reserved.

关键词： Fibers

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Gas drainage methods and developing direction of gob 8

Gas drainage methods and developing direction of gob

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8th Academic Conference of Geology Resource Management and Sustainable Development

作者： Yan, Bao-Yong Cao, Liu Chongqing Research Institute China Coal Technology and Engineering Group Chongqing400039 China State Key Lab. of Gas Disaster Monitoring and Control as Well as Emergency Technology Chongqing China Southwest Petroleum University Chengdu610500 China

ISBN: (纸本)9781921712739

In the coal mine gas drainage, the gas drainage in gob has a dominant position. According to different stages of the production, the mining areas are divided into the gob, the old one and the abandoned one. Gas drainage of gob has an important influence on mining propulsion. Through comparative analysis of various drainage methods, exclusive tunnel pumping method will gradually be eliminated with the promotion of directional drilling technique in the roof construction and application. Large diameter roof horizontal directional long drill hole will replace the roof pumping lane, the roof short drilling, and gob buried drainage pipe. Some old gob has begun experiments of ground wells. A well used repeatedly can maximize the drainage of gas in the future, along with one-well three-purpose technology continues to be mature. The true sense of the abandoned mine gas drainage is still blank in China, according to the experience of foreign pumping, the ground large diameter bored construction will become a reasonable choice in obsolete mine gob gas drainage. © Geology Resource Management and Sustainable *** right reserved.

关键词： Roofs

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Computer transient simulation for dual in-line package through finite element analysis and ANASYS software 3

Computer transient simulation for dual in-line package throu...

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3rd International Conference on Electrical, Communication and Computer engineering, ICECCE 2021

作者： Su, Wei Luo, Wenhao Dong, Xianshan Chen, Si Tomar, Agam Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Guangzhou China School of Mechanics and Construction Engineering Jinan University Guangzhou China Faculty of Engineering and Mathematical Sciences University of Western Australia Australia

The reliability of the DIP package is studied by numerical simulation. Firstly, the DIP package, fixture and metal steel are modeled. Based on this, variable thickness papers are laid on the sample. According to the experiment, corresponding excitation and boundary condition are set. Then, the transient analysis result of DIP package is obtained through numerical simulation. The results show the relation of different thickness papers and acceleration-time curve, which provides a beneficial reference for the optimization of DIP packing. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Transient analysis

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Residual stress analysis of laser welding between output needle and helix 7

Residual stress analysis of laser welding between output nee...

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2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020

作者： Su, Wei Luo, Wenhao Dong, Xianshan Liu, Renhuai MOE Key Lab of Disaster Forecast and Control in Engineering Guangzhou510632 China Sci. and Technol. on Reliability Phys. and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou510610 China School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China

In order to obtain the welding stress of the output needle and helix, a finite element model is established and the mesh at the weld is refined to evaluate the welding residual stress. ANSYS parameter design language is used to simulate the motion load of welding heat source. Based on the exact calculation of the temperature field, the corresponding thermal units are converted into structural units to calculate the welding residual stress. Finally, the thermal stress distribution curve and residual stress distribution trend are obtained after post-treatment. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Residual stresses

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Harmonic response analysis for ball grid array package using computer finite element simulation 3

Harmonic response analysis for ball grid array package using...

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3rd International Conference on Electrical, Communication and Computer engineering, ICECCE 2021

BGA package is selected as the research object in this paper. Workbench (finite elemental analysis tool in ANSYS) is used for harmonic response analysis. The author lays several paper sheets on the sample and builds the finite element model of clamp, ceramic and metal plate. Then, the model analysis is carried out. Based on this, it is converted to harmonic response analysis. According to the results, the author has found that there is no relation between the number of paper sheets and acceleration-frequency result. It promotes the development of electronic packaging reliability. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Finite element method

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Finite element analysis of subsurface damage of optical glass after grinding 7

Finite element analysis of subsurface damage of optical glas...

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2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020

The interaction between abrasive particles and optical element surface can result in various forms of subsurface damage while removing the material. In order to obtain the stress distribution during optical glass grinding, the finite element analysis of optical glass grinding is carried out by using ANSYS software. The stress distribution of optical glass was obtained by establishing the grinding model of consolidated abrasive and free abrasive. The simulation results show that different abrasives have different damage degrees to the glass surface, which provides a useful reference for improving the quality of optical material processing technology. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Grinding (machining)

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Performance Enhancement of Recycled Coarse Aggregate Concrete by Incorporating with Macro Fibers Processed from Waste Gfrp

SSRN

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SSRN 2023年

作者： Fu, Bing Xu, Guang-Ti Peng, Wei-Sen Huang, Jizhi Zou, Qiqi Kuang, You-Di School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China College of Water Conservancy and Civil Engineering South China Agricultural University Guangzhou510642 China Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518000 China School of Civil Engineering and Architecture Wuyi University Jiangmen529020 China

Reprocessing into coarse aggregates of concrete is a sustainable solution for the disposal of construction and demolition (C&D) waste. Use of recycled coarse aggregates however leads to a degradation in the mechanical properties of the resulting concrete, which then limits the use of recycled aggregates concrete (RAC) in structural elements. The incorporation of discrete fibers shows to be effective in eliminating the mechanical degradation problem of RAC, and this paper has therefore proposed to use macro fibers recycled from waste glass fiber reinforced polymer (GFRP) to reinforce RAC, thus improving the robustness of RAC in structural elements. The effect of macro fibers on the mechanical properties of RAC has been first examined through a series of compression and bending tests. Then, the tensile constitutive law of concrete was derived based on the load-deflection response of the beam specimens using an inverse analysis. The results revealed that the mechanical properties (e.g., compressive toughness, flexural strength, flexural toughness) of RAC can be significantly enhanced by the fiber addition. For concrete with 50% recycled aggregate (RA), the increase of macro fibers (from 0% to 0.5%, 1%, and 1.5%) leads to the enhancement of flexural strength from 3.13 MPa to 3.54, 4.69, and 5.97 MPa, and the toughness (T150) from 1.4 J to 35.5, 59.2 and 77.6 J, respectively. Such enhancements in the mechanical properties of RAC demonstrate the feasibility of the proposed method. © 2023, The Authors. All rights reserved.

关键词： Bending strength

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