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Review on residual stress and its effects on manufacturing of aluminium alloy structural panels with typical multi-processes 认领 引用 被引量：12
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作者 Yong LI Wanni GAN +1 位作者 Wenbin ZHOU Dongsheng LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第5期96-124,共29页
In the aerospace industry,integrated aluminium alloy plates and stiffened panels with high accuracy and performance attract significant interest.To manufacture these panels as integrity with high accuracy,multiple pro... In the aerospace industry,integrated aluminium alloy plates and stiffened panels with high accuracy and performance attract significant interest.To manufacture these panels as integrity with high accuracy,multiple processes need to be utilised,such as machining,welding and forming.During the whole manufacturing chain,residual stresses can be generated and redistributed in the components among different processes.The residual stress would significantly affect the shapes and properties of the final products.Currently,these great effects are not well considered in the design and manufacturing processes.This paper aims to draw a general understanding of the residual stress generated in the pre-manufacturing processes and its effects on subsequent manufacturing processes.The mechanisms and distributions of residual stresses generated in typical premanufacturing processes of structural panels,including machining,welding and additive manufacturing(AM),are firstly summarised.The detailed effects of generated residual stresses on distortion and application properties in subsequent manufacturing processes are then concluded.In addition,current methods developed for the investigation of residual stress effect in multi-processes manufacturing are critically reviewed,including experimental,analytical,finite element(FE)and machine learning methods.Furthermore,the future development trend of methods for residual stress consideration and control in the design of manufacturing processes is summarised,providing comprehensive guidance to achieve the high accurate manufacturing of aluminium alloy structural components. 展开更多
关键词 Residual stress Stiffened panel Aluminium alloy Multi-processes manufacturing Machining Welding Additive manufacturing
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Strengthening of Mg-8Li-5Al-0.5Ca-0.2Y alloy via multi-process deformation 认领 引用
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作者 Jianyang Gao Keqiang Su +3 位作者 Enyu Guo Zongning Chen Huijun Kang Tongmin Wang 《Metals Advances》 SCIE EI CAS CSCD 2026年第7期92-100,共9页
This study examines an Mg-8Li-5Al-0.5Ca-0.2Y alloy subjected to multi-step thermo-mechanical processing comprising hot extrusion,hot rolling,and room-temperature rolling.Extrusion at 300°C triggers dynamic recrys... This study examines an Mg-8Li-5Al-0.5Ca-0.2Y alloy subjected to multi-step thermo-mechanical processing comprising hot extrusion,hot rolling,and room-temperature rolling.Extrusion at 300°C triggers dynamic recrystallization of theα-Mg phase and leads to the formation of MgLi2Al and AlLi precipitates within theβ-Li matrix,while Al2Ca and Al2Y phases segregate along the extrusion direction.Subsequent rolling at 260°C and room temperature further refinesα-Mg grains,raises dislocation density,and homogenizes the dispersed Al2Ca and Al2Y particles.Texture analysis indicates that theα-Mg component reorients from the transverse direction toward the normal direction,driven by the competition between basal and prismatic slip,and exhibits enhanced texture strength.In contrast,theβ-Li phase preserves stableα-andγ-fiber textures.The multi-step deformation process endows the alloy with a balanced combination of tensile strength(303 MPa),yield strength(273 MPa),and elongation(8.6%).These improvements are attributed to collective contributions from grain refinement,stress-induced phase transformation,and dislocation accumulation during plastic deformation.The established microstructure–property correlations provide a viable pathway for designing high-strength Mg alloys with tailored texture and phase distribution. 展开更多
关键词 Mg-Li alloy Multi-process deformation Precipitation Mechanical property
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Quantitative evaluation of multi-process collaborative operation in steelmaking–continuous casting sections 认领 引用 被引量：12
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作者 Jian-ping Yang Qing Liu +1 位作者 Wei-da Guo Jun-guo Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第8期1353-1366,共14页
The quantitative evaluation of multi-process collaborative operation is of great significance for the improvement of production planning and scheduling in steelmaking–continuous casting sections(SCCSs). However, this... The quantitative evaluation of multi-process collaborative operation is of great significance for the improvement of production planning and scheduling in steelmaking–continuous casting sections(SCCSs). However, this evaluation is difficult since it relies on an in-depth understanding of the operating mechanism of SCCSs, and few existing methods can be used to conduct the evaluation, due to the lack of full-scale consideration of the multiple factors related to the production operation. In this study, three quantitative models were developed, and the multiprocess collaborative operation level was evaluated through the laminar-flow operation degree, the process matching degree, and the scheduling strategy availability degree. Based on the evaluation models for the laminar-flow operation and process matching levels, this study investigated the production status of two steelmaking plants, plants A and B, based on actual production data. The average laminar-flow operation(process matching) degrees of SCCSs were obtained as 0.638(0.610) and 1.000(0.759) for plants A and B, respectively, for the period of April to July 2019. Then, a scheduling strategy based on the optimization of the furnace-caster coordinating mode was suggested for plant A. Simulation experiments showed higher availability than the greedy-based and manual strategies. After the proposed scheduling strategy was applied,the average process matching degree of the SCCS of plant A increased by 4.6% for the period of September to November 2019. The multi-process collaborative operation level was improved with fewer adjustments and interruptions in casting. 展开更多
关键词 steelmaking–continuous casting multi-process collaborative operation quantitative evaluation model laminar-flow operation process matching scheduling strategy
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Multi-Core Parallel Based Polarimetric InSAR Data Processing Method and Application Cases 认领 引用
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作者 Lin Liu Yuyang Zheng +4 位作者 Wanwu Li Yan Zhang Xiutao Tang Zenghui Pang Ligang Jia 《Journal of Beijing Institute of Technology》 EI CAS 2026年第3期292-305,共14页
Based on analyzing the storage structure of polarimetric interferometry synthetic aperture radar(Pol-InSAR)data,this study proposed a multi-core parallel Pol-InSAR data processing method(MCP-PIDPM).In order to improve... Based on analyzing the storage structure of polarimetric interferometry synthetic aperture radar(Pol-InSAR)data,this study proposed a multi-core parallel Pol-InSAR data processing method(MCP-PIDPM).In order to improve the processing speed of Pol-InSAR data,this paper presented a multi-core parallel Pol-InSAR data processing scheme,and constructed its processing framework in the research.The key technology of the multi-core parallel Pol-InSAR data processing was discussed,a buffer detection splitting method for Pol-InSAR image was proposed,and improved the self-adaptive phase unwrapping method.At last,a multi-core parallel Pol-InSAR data processing system(MCP-PIDPS)was developed,and the proposed MCP-PIDPM method was tested and validated through experiments.The system based on the above method assigns tasks and loads reasonably to each processor and uses space to exchange time.It is proved by numerical experiments that the efficiency of Pol-InSAR data processing is increased by more than 10 times.The research breaks through the bottleneck which restricts the efficient application of Pol-InSAR,and provides a feasible solution for the efficient processing of Pol-InSAR data. 展开更多
关键词 InSAR polarimetric InSAR DEM parallel computing open multi-processing
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Numerical analysis of microbially induced calcite precipitation and enzyme induced calcite precipitation in calcareous sand:Multiprocess and biochemical reactions 认领 引用 被引量：3
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作者 Yujie Li Zhen Guo +2 位作者 Lizhong Wang Xingye Sun Yongqiang Zhu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第5期3225-3242,共18页
Microbially induced calcite precipitation(MICP)and Enzyme induced calcite precipitation(EICP)techniques were implemented to reinforce the large-scale calcareous sand in this study.Then a coupled numerical model to pre... Microbially induced calcite precipitation(MICP)and Enzyme induced calcite precipitation(EICP)techniques were implemented to reinforce the large-scale calcareous sand in this study.Then a coupled numerical model to predict the biochemical reactions and hydraulic characteristics of MICP and EICP reactions was proposed and verified by physical experiments.Results showed that:This model could describe the variations of bacteria,calcium,calcite,permeability over time reasonably.It is necessary to consider the influence of the calculation domain scale when simulating the convection-diffusionreaction in the multi-process of MICP and EICP reactions.The numerical and experimental values of calcite content are 0.841 g/cm3 and 0.861 g/cm3 for MICP-reinforced sand,0.263 g/cm3 and 0.227 g/cm3 for EICP-reinforced sand after 192 h of reaction.The reaction rate krea is an important parameter to control the calcite content.Accordingly,the permeability coefficient of MICP and EICP reinforced calcareous sand decreases by 32%and 18%.Due to the influence of substance transportation and calcite precipitation,the calcite shows a trend of decreasing firstly and then increasing with the enhancing of the initial permeability coefficient in biochemical reactions.The optimal injecting ratio q11:q12 in this study is 100:300 mL/min.The process for the application of MICP and EICP coupled numerical model is also recommended,which provides reference for engineering projects in ground improvement. 展开更多
关键词 Coupled model Finite element method(FEM) Microbial induced calcite precipitation(MICP) Enzyme induced calcite precipitation(EICP) Multi-process Biochemical reactions
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On Numerical methods for determination of Earth gravity field model using mass satellite gravity gradiometry data 认领 引用
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作者 Zhu Guangbin Chang Xiaotao +2 位作者 Li Xinfa Zhang Xinhang Li Yuxing 《Geodesy and Geodynamics》 2012年第1期57-62,共6页
On the basis of Space-Wise Least Square method, three numerical methods including Cholesky de- composition, pre-conditioned conjugate gradient and Open Multi-Processing parallel algorithm are applied into the determin... On the basis of Space-Wise Least Square method, three numerical methods including Cholesky de- composition, pre-conditioned conjugate gradient and Open Multi-Processing parallel algorithm are applied into the determination of gravity field with satellite gravity gradiometry data. The results show that, Cholesky de- composition method has been unable to meet the requirements of computation efficiency when the computer hardware is limited. Pre-conditioned conjugate gradient method can improve the computation efficiency of huge matrix inversion, but it also brings a certain loss of precision. The application of Open Multi-Processing parallel algorithm could achieve a good compromise between accuracy and computation efficiency. 展开更多
关键词 satellite gravity gradiometry Cholesky decomposition pre-conditioned conjugate gradient open multi-processing parallel algorithm data processing
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不可逾越的长城——由IDF 2003再谈Hyper Threading技术的未来 认领 引用
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作者 白慧 《电脑》 2003年第12期72-74,共3页
自从Intel推出Hyper Threading(超线程)技术以来,以超强的性能改变了以往一切,桌面处理器又一次改朝换代,Intel并不只是在频率上提升处理器性能,同时在其它领域也让处理器有质的飞跃,继MMX、SSE、SSEII之后,Intel把原来只用在工作站上的... 自从Intel推出Hyper Threading(超线程)技术以来,以超强的性能改变了以往一切,桌面处理器又一次改朝换代,Intel并不只是在频率上提升处理器性能,同时在其它领域也让处理器有质的飞跃,继MMX、SSE、SSEII之后,Intel把原来只用在工作站上的Xeon CPU的Hyper Threading技术也引入到桌面处理器中,HT技术可以让一个CPU当成两个使用?这也许在以往一些HT技术中就介绍过,但今天写这个文章,主要是分析HT的工作原理以及Single Threading与Mutil-Tasking的区别,在多核心处理器时代HT又将会如何?以此来对HT的未来做一个最后的展望。 展开更多
关键词 Intel公司 超线程技术 处理器 多任务处理 Multi-Processing技术 工作原理
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Explanation of Multi-process Competition for SRS Gain Anomaly 认领 引用 被引量：1
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作者 张梓华 张华安 《Chinese Science Bulletin》 1993年第2期111-115,共5页
1 Introduction The explanation of the gain anomaly of the stimulated Raman scattering (SRS) in nonself-focusing medium has been one of the perplexing problems for all the researchers in quantum electronics, especially... 1 Introduction The explanation of the gain anomaly of the stimulated Raman scattering (SRS) in nonself-focusing medium has been one of the perplexing problems for all the researchers in quantum electronics, especially the explanation of the Grun’s experimental result. 展开更多
关键词 SRS gain anomaly four-wave mixing multi-process competition.
Iso-UniK:lightweight multi-process unikernel through memory protection keys 认领 引用
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作者 Guanyu Li Dong Du Yubin Xia 《Cybersecurity》 EI 2018年第1期34-47,共14页
Unikernel,specializing a minimalistic libOS with an application,is an attractive design for cloud computing.However,the Achilles’heel of unikernel is the lack of multi-process support,which makes it less flexible and... Unikernel,specializing a minimalistic libOS with an application,is an attractive design for cloud computing.However,the Achilles’heel of unikernel is the lack of multi-process support,which makes it less flexible and applicable.Many applications rely on the process abstraction to isolate different components.For example,Apache with the multi-processing module isolates a request handler in a process to guarantee security.Prior art tackles the problem by simulating multi-process with multiple unikernels,which is incompatible with existing cloud providers and also introduces high overhead.This paper proposes Iso-UniK,a new unikernel design enabling multi-task applications with the support of both functionality and isolation.Iso-UniK leverages a recent hardware feature,named Intel Memory Protection Key(Intel MPK),to provide lightweight and efficient isolation for multi-process in unikernel.Our design has three benefits compared with previous approaches.First,Iso-UniK does not need hypervisor support and is thus compatible with existing cloud computing platforms;second,Iso-UniK promises fast system calls with only 45 cycles;last,a process can be isolated with a flexible configuration.We have implemented a prototype based on OSv,a unikernel system supporting unmodified applications.Iso-UniK can achieve fast fork operation with only 66μs for multi-process applications.Our evaluation shows that the isolation and multi-process support in Iso-UniK will not damage the applications’performance. 展开更多
关键词 Unikernel Multi-process Intel MPK Isolation
Wet torrefaction of Indonesian agricultural waste biomass:product evaluation and analysis of slaggingfouling potential 认领 引用
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作者 Muhammad A.A.Efendi Toto Hardianto Pandji Prawisudha 《Clean Energy》 EI CSCD 2025年第3期1-10,共10页
The agricultural waste biomass holds potential as a valuable resource,capable of being converted into high-grade solid fuel for energy production.Despite the ample availability of rice straw and palm oil empty fruit b... The agricultural waste biomass holds potential as a valuable resource,capable of being converted into high-grade solid fuel for energy production.Despite the ample availability of rice straw and palm oil empty fruit bunch stock,challenges persist with biomass feedstock,such as low calorific values and high slagging-fouling potency.The wet torrefaction process,known as hydrothermal torrefaction,enhances agricultural waste biomass into solid fuel comparable to lignite and sub-bituminous coal.The study investigates the slagging-fouling potential of raw agriculture biomass waste and wet torrefaction-treated variants,evaluating sample characteristics through proximate,ultimate,and calorific value analyses.This study also investigates the potential of the wet torrefaction process as a pre-treatment in multi-process conversion.The moisture content of the wet torrefaction biomass decreased slightly,and the calorific value of the wet torrefaction biomass samples was higher than that of the raw biomass.The result of rice straw wet torrefaction at 240℃was a gross calorific value of 16.29 MJ/kg,equivalent to lignite A,with slagging potential decreased from 0.021(low)to 0.011(low),and the fouling potential from 0.921(medium)to 0.322(low).The result of palm oil empty fruit bunches,wet torrefaction at 240℃achieved the highest gross calorific value of 20.38 MJ/kg,equivalent to sub-bituminous C coal,with slagging potential reduced from 0.076(low)to 0.031(low)and fouling potential reduced from 74.84(high)to 20.27(medium).Wet torrefaction shows potential as a pre-treatment for multi-process conversion.Future studies should consider sequential torrefaction(wet and dry methods)that could leverage the advantages of each,reducing slagging and fouling potential while increasing the calorific value. 展开更多
关键词 biomass wet torrefaction hydrothermal multi-process
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A multi process value-based reinforcement learning environment framework for adaptive traffic signal control 认领 引用 被引量：1
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作者 Jie Cao Dailin Huang +1 位作者 Liang Hou Jialin Ma 《Journal of Control and Decision》 EI 2023年第2期229-236,共8页
Realising adaptive traffic signal control(ATSC)through reinforcement learning(RL)is an important means to easetraffic congestion.This paper finds the computing power of the central processing unit(CPU)cannot fully use... Realising adaptive traffic signal control(ATSC)through reinforcement learning(RL)is an important means to easetraffic congestion.This paper finds the computing power of the central processing unit(CPU)cannot fully usedwhen Simulation of Urban MObility(SUMO)is used as an environment simulator for RL.We propose a multi-process framework under value-basedRL.First,we propose a shared memory mechanism to improve exploration efficiency.Second,we use the weight sharing mechanism to solve the problem of asynchronous multi-process agents.We also explained the reason shared memory in ATSC does not lead to early local optima of the agent.Wehave verified in experiments the sampling efficiency of the 10-process method is 8.259 times that of the single process.The sampling efficiency of the 20-process method is 13.409 times that of the single process.Moreover,the agent can also converge to the optimal solution. 展开更多
关键词 Adaptive traffic signal control Simulation of Urban MObility multi-process reinforcement learning value-based
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