Journal of Central South University最新文献

Multi-dimension and multi-modal rolling mill vibration prediction model based on multi-level network fusion 基于多级网络融合的多维度、多模态轧机振动预测模型

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-09-12 DOI: 10.1007/s11771-024-5762-9

Shu-zong Chen, Yun-xiao Liu, Yun-long Wang, Cheng Qian, Chang-chun Hua, Jie Sun

{"title":"Multi-dimension and multi-modal rolling mill vibration prediction model based on multi-level network fusion","authors":"Shu-zong Chen, Yun-xiao Liu, Yun-long Wang, Cheng Qian, Chang-chun Hua, Jie Sun","doi":"10.1007/s11771-024-5762-9","DOIUrl":"https://doi.org/10.1007/s11771-024-5762-9","url":null,"abstract":"Mill vibration is a common problem in rolling production, which directly affects the thickness accuracy of the strip and may even lead to strip fracture accidents in serious cases. The existing vibration prediction models do not consider the features contained in the data, resulting in limited improvement of model accuracy. To address these challenges, this paper proposes a multi-dimensional multi-modal cold rolling vibration time series prediction model (MDMMVPM) based on the deep fusion of multi-level networks. In the model, the long-term and short-term modal features of multi-dimensional data are considered, and the appropriate prediction algorithms are selected for different data features. Based on the established prediction model, the effects of tension and rolling force on mill vibration are analyzed. Taking the 5th stand of a cold mill in a steel mill as the research object, the innovative model is applied to predict the mill vibration for the first time. The experimental results show that the correlation coefficient (R2) of the model proposed in this paper is 92.5%, and the root-mean-square error (RMSE) is 0.0011, which significantly improves the modeling accuracy compared with the existing models. The proposed model is also suitable for the hot rolling process, which provides a new method for the prediction of strip rolling vibration.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of rare earth element erbium on microstructures and properties of as-cast 8030 aluminum alloy 稀土元素铒对铸件 8030 铝合金微观结构和性能的影响

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-09-11 DOI: 10.1007/s11771-024-5723-3

Hao-qing Tang, Hong-ying Li, Dong Jin, Xiang-hua Hu, Jing Xu, Hua-bin Li

引用次数: 0

The improvement of large-scale-region landslide susceptibility mapping accuracy by transfer learning 通过迁移学习提高大尺度区域滑坡易感性绘图的准确性

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-09-07 DOI: 10.1007/s11771-024-5761-x

Wen-gang Zhang, Song-lin Liu, Lu-qi Wang, Wei-xin Sun, Yan-mei Zhang, Wen Nie

{"title":"The improvement of large-scale-region landslide susceptibility mapping accuracy by transfer learning","authors":"Wen-gang Zhang, Song-lin Liu, Lu-qi Wang, Wei-xin Sun, Yan-mei Zhang, Wen Nie","doi":"10.1007/s11771-024-5761-x","DOIUrl":"https://doi.org/10.1007/s11771-024-5761-x","url":null,"abstract":"Machine-learning methodologies have increasingly been embraced in landslide susceptibility assessment. However, the considerable time and financial burdens of landslide inventories often result in persistent data scarcity, which frequently impedes the generation of accurate and informative landslide susceptibility maps. Addressing this challenge, this study compiled a nationwide dataset and developed a transfer learning-based model to evaluate landslide susceptibility in the Chongqing region specifically. Notably, the proposed model, calibrated with the warmup-cosine annealing (WCA) learning rate strategy, demonstrated remarkable predictive capabilities, particularly in scenarios marked by data limitations and when training data were normalized using parameters from the source region. This is evidenced by the area under the receiver operating characteristic curve (AUC) values, which exhibited significant improvements of 51.00%, 24.40% and 2.15%, respectively, compared to a deep learning model, in contexts where only 1%, 5% and 10% of data from the target region were used for retraining. Simultaneously, there were reductions in loss of 16.12%, 27.61% and 15.44%, respectively, in these instances.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A hybrid ventilation scheme applied to bi-directional excavation tunnel construction with a long inclined shaft 应用于双向开挖长斜井隧道施工的混合通风方案

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-08-17 DOI: 10.1007/s11771-024-5732-2

Wei-chao Yang, Jian Wang, E. Deng, Yi-kang Liu, Lu-sen Luo, Jia Yang

{"title":"A hybrid ventilation scheme applied to bi-directional excavation tunnel construction with a long inclined shaft","authors":"Wei-chao Yang, Jian Wang, E. Deng, Yi-kang Liu, Lu-sen Luo, Jia Yang","doi":"10.1007/s11771-024-5732-2","DOIUrl":"https://doi.org/10.1007/s11771-024-5732-2","url":null,"abstract":"The breakage and bending of ducts result in a difficulty to cope with ventilation issues in bi-directional excavation tunnels with a long inclined shaft using a single ventilation method based on ducts. To discuss the hybrid ventilation system applied in bi-directional excavation tunnels with a long inclined shaft, this study has established a full-scale computational fluid dynamics model based on field tests, the Poly-Hexcore method, and the sliding mesh technique. The distribution of wind speed, temperature field, and CO in the tunnel are taken as indices to compare the ventilation efficiency of three ventilation systems (duct, duct-ventilation shaft, duct–ventilated shaft-axial fan). The results show that the hybrid ventilation scheme based on duct-ventilation shaft–axial fan performs the best among the three ventilation systems. Compared to the duct, the wind speed and cooling rate in the tunnel are enhanced by 7.5%–30.6% and 14.1%–17.7%, respectively, for the duct-vent shaft-axial fan condition, and the volume fractions of CO are reduced by 26.9%–73.9%. This contributes to the effective design of combined ventilation for bidirectional excavation tunnels with an inclined shaft, ultimately improving the air quality within the tunnel.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energy evolution model and energy response characteristics of freeze-thaw damaged sandstone under uniaxial compression 单轴压缩下冻融破坏砂岩的能量演化模型和能量响应特性

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-08-17 DOI: 10.1007/s11771-024-5734-0

Chun-yang Zhang, Tao Tan, Er-cheng Zhao

{"title":"Energy evolution model and energy response characteristics of freeze-thaw damaged sandstone under uniaxial compression","authors":"Chun-yang Zhang, Tao Tan, Er-cheng Zhao","doi":"10.1007/s11771-024-5734-0","DOIUrl":"https://doi.org/10.1007/s11771-024-5734-0","url":null,"abstract":"Rocks will suffer different degree of damage under FT (freeze-thaw) cycles, which seriously threatens the long-term stability of rock engineering in cold regions. In order to study the mechanism of rock FT damage, energy calculation method and energy self-inhibition model are introduced to explore their energy characteristics in this paper. The applicability of the energy self-inhibition model was verified by combining the data of FT cycles and uniaxial compression tests of intact and pre-cracked sandstone samples, as well as published reference data. In addition, the energy evolution characteristics of FT damaged rocks were discussed accordingly. The results indicate that the energy self-inhibition model perfectly characterizes the energy accumulation characteristics of FT damaged rocks under uniaxial compression before the peak strength and the energy dissipation characteristics before microcrack unstable growth stage. Taking the FT damaged cyan sandstone sample as an example, it has gone through two stages dominated by energy dissipation mechanism and energy accumulation mechanism, and the energy rate curve of the pre-cracked sample shows a fall-rise phenomenon when approaching failure. Based on published reference data, it was found that the peak total input energy and energy storage limit conform to an exponential FT decay model, with corresponding decay constants ranging from 0.0021 to 0.1370 and 0.0018 to 0.1945, respectively. Finally, a linear energy storage equation for FT damaged rocks was proposed, and its high reliability and applicability were verified by combining published reference data,the energy storage coefficient of different types of rocks ranged from 0.823 to 0.992, showing a negative exponential relationship with the initial UCS (uniaxial compressive strength). In summary, the mechanism by which FT weakens the mechanical properties of rocks has been revealed from an energy perspective in this paper, which can provide reference for related issues in cold regions.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hollow tubes constructed by carbon nanotubes self-assembly for CO2 capture 通过碳纳米管自组装构建空心管，用于捕获二氧化碳

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-08-13 DOI: 10.1007/s11771-024-5701-9

Xu-rui Chen, Jun Wu, Li Gu, Xue-bo Cao

引用次数: 0

Effect of quenching cooling rate on residual stress and microstructure evolution of 6061 aluminum alloy 淬火冷却速度对 6061 铝合金残余应力和微观结构演变的影响

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-08-13 DOI: 10.1007/s11771-024-5705-5

Ke Huang, You-ping Yi, Shi-quan Huang, Hai-lin He, Jie Liu, Hong-en Hua, Yun-jian Tang

{"title":"Effect of quenching cooling rate on residual stress and microstructure evolution of 6061 aluminum alloy","authors":"Ke Huang, You-ping Yi, Shi-quan Huang, Hai-lin He, Jie Liu, Hong-en Hua, Yun-jian Tang","doi":"10.1007/s11771-024-5705-5","DOIUrl":"https://doi.org/10.1007/s11771-024-5705-5","url":null,"abstract":"In this study, the cooling rate was manipulated by quenching with water of different temperatures (30, 60 and 100 °C). Surface and internal residual stresses in the quenched 6061 aluminum alloy samples were measured using hole-drilling and crack compliance methods, respectively. Then, the processability of the quenched samples was evaluated at cryogenic temperatures. The mechanical properties of the as-aged samples were assessed, and microstructure evolution was analyzed. The surface residual stresses of samples W30°C, W60°C and W100°C is −178.7, −161.7 and −117.2 MPa, respectively along x-direction, respectively; and −191.2, −172.1 and −126.2 MPa, respectively along y-direction. The sample quenched in boiling water displaying the lowest residual stress (∼34 % and ∼60% reduction in the surface and core). The generation and distribution of quenching residual stress could be attributed to the lattice distortion gradient. Desirable plasticity was also exhibited in the samples with relatively low quenching cooling rates at cryogenic temperatures. The strengthes of the as-aged samples are 291.2 to 270.1 MPa as the quenching water temperature increase from 30 °C to 100 °C. Fine and homogeneous β″ phases were observed in the as-aged sample quenched with boiling water due to the clusters and Guinier-Preston zones (GP zones) premature precipitated during quenching process.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metal-organic framework-derived porous carbon for the advanced aqueous zinc-ion hybrid capacitor 用于先进锌-离子水基混合电容器的金属有机框架衍生多孔碳

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-08-13 DOI: 10.1007/s11771-024-5736-y

Wei-fang Liu, Zi-han Hu, Qi Zhang

{"title":"Metal-organic framework-derived porous carbon for the advanced aqueous zinc-ion hybrid capacitor","authors":"Wei-fang Liu, Zi-han Hu, Qi Zhang","doi":"10.1007/s11771-024-5736-y","DOIUrl":"https://doi.org/10.1007/s11771-024-5736-y","url":null,"abstract":"Aqueous zinc ion hybrid capacitors (ZIHCs) are considered one of the most promising electrochemical energy storage systems due to their high safety, environmental friendliness, low cost, and high power density. However, the low energy density and the lack of sustainable design strategies for the cathodes hinder the practical application of ZIHCs. Herein, we design the N and O co-doped porous carbon cathode by annealing metal-organic framework (ZIF-8). ZIF-8 retains the original dodecahedral structure with a high specific surface (2814.67 m2/g) and IG/ID ratio of 1.0 during carbonization and achieves self-doping of N and O heteroatoms. Abundant defect sites are introduced into the porous carbon to provide additional active sites for ion adsorption after the activation of carbonized ZIF-8 by KOH treatment. The ZIHCs assembled with modified ZIF-8 as the cathode and commercial zinc foil as the anode show an energy density of 125 W · h/kg and a power density of 79 W/kg. In addition, this ZIHCs device achieves capacity retention of 77.8% after 9000 electrochemical cycles, which is attributed to the diverse pore structure and plentiful defect sites of ZIF-8-800(KOH). The proposed strategy may be useful in developing high-performance metal-ion hybrid capacitors for large-scale energy storage.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A whole process damage constitutive model for layered sandstone under uniaxial compression based on Logistic function 基于 Logistic 函数的单轴压缩条件下层状砂岩全过程损伤构成模型

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-08-13 DOI: 10.1007/s11771-024-5580-0

Dong-qiao Liu, Yun-peng Guo, Kai Ling, Jie-yu Li

{"title":"A whole process damage constitutive model for layered sandstone under uniaxial compression based on Logistic function","authors":"Dong-qiao Liu, Yun-peng Guo, Kai Ling, Jie-yu Li","doi":"10.1007/s11771-024-5580-0","DOIUrl":"https://doi.org/10.1007/s11771-024-5580-0","url":null,"abstract":"Bedding structural planes significantly influence the mechanical properties and stability of engineering rock masses. This study conducts uniaxial compression tests on layered sandstone with various bedding angles (0°, 15°, 30°, 45°, 60°, 75° and 90°) to explore the impact of bedding angle on the deformational mechanical response, failure mode, and damage evolution processes of rocks. It develops a damage model based on the Logistic equation derived from the modulus’s degradation considering the combined effect of the sandstone bedding dip angle and load. This model is employed to study the damage accumulation state and its evolution within the layered rock mass. This research also introduces a piecewise constitutive model that considers the initial compaction characteristics to simulate the whole deformation process of layered sandstone under uniaxial compression. The results revealed that as the bedding angle increases from 0° to 90°, the uniaxial compressive strength and elastic modulus of layered sandstone significantly decrease, slightly increase, and then decline again. The corresponding failure modes transition from splitting tensile failure to slipping shear failure and back to splitting tensile failure. As indicated by the modulus’s degradation, the damage characteristics can be categorized into four stages: initial no damage, damage initiation, damage acceleration, and damage deceleration termination. The theoretical damage model based on the Logistic equation effectively simulates and predicts the entire damage evolution process. Moreover, the theoretical constitutive model curves closely align with the actual stress – strain curves of layered sandstone under uniaxial compression. The introduced constitutive model is concise, with fewer parameters, a straightforward parameter determination process, and a clear physical interpretation. This study offers valuable insights into the theory of layered rock mechanics and holds implications for ensuring the safety of rock engineering.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bearing mechanism of roof and rib support structure in automatically formed roadway and its support design method 自动成型巷道顶板和肋板支护结构的支承机理及其支护设计方法

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-08-13 DOI: 10.1007/s11771-024-5678-4

Bei Jiang, Ming-zi Wang, Qi Wang, Zhong-xin Xin, Xue-yang Xing, Yu-song Deng, Liang-di Yao

{"title":"Bearing mechanism of roof and rib support structure in automatically formed roadway and its support design method","authors":"Bei Jiang, Ming-zi Wang, Qi Wang, Zhong-xin Xin, Xue-yang Xing, Yu-song Deng, Liang-di Yao","doi":"10.1007/s11771-024-5678-4","DOIUrl":"https://doi.org/10.1007/s11771-024-5678-4","url":null,"abstract":"Non-pillar mining technology with automatically formed roadway is a new mining method without coal pillar reservation and roadway excavation. The stability control of automatically formed roadway is the key to the successful application of the new method. In order to realize the stability control of the roadway surrounding rock, the mechanical model of the roof and rib support structure is established, and the influence mechanism of the automatically formed roadway parameters on the compound force is revealed. On this basis, the roof and rib support structure technology of confined lightweight concrete is proposed, and its mechanical tests under different eccentricity are carried out. The results show that the bearing capacity of confined lightweight concrete specimens is basically the same as that of ordinary confined concrete specimens. The bearing capacity of confined lightweight concrete specimens under different eccentricities is 1.95 times higher than those of U-shaped steel specimens. By comparing the test results with the theoretical calculated results of the confined concrete, the calculation method of the bearing capacity for the confined lightweight concrete structure is selected. The design method of confined lightweight concrete support structure is established, and is successfully applied in the extra-large mine, Ningtiaota Coal Mine, China.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0