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Experimental and simulation research on hollow AZ31 magnesium alloy three-channel joint by hot extrusion forming with sand mandrel
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作者 Shi Shengnan Wang Hongyu +4 位作者 Teng Fei Jiang Lei Sun Juncai Sun Jie Zhang Shunhu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第1期98-109,共12页
Magnesium alloy is one of the lightest metal structural materials.The weight is further reduced through the hollow structure.However,the hollow structure is easily damaged during processing.In order to maintain the ho... Magnesium alloy is one of the lightest metal structural materials.The weight is further reduced through the hollow structure.However,the hollow structure is easily damaged during processing.In order to maintain the hollow structure and to transfer the stresses during the high temperature deformation,the sand mandrel is proposed.In this paper,the hollow AZ31 magnesium alloy three-channel joint is studied by hot extrusion forming.Sand as one of solid granule medium is used to fill the hollow magnesium alloy.The extrusion temperatures are 230℃ and 300℃,respectively.The process parameters(die angle,temperature,bottom thickness,sidewall thickness,edge-to-middle ratio in bottom,bottom shape)of the hollow magnesium alloy are analyzed based on the results of experiments and the finite element method.The results are shown that the formability of the hollow magnesium alloy will be much better when the ratio of sidewall thickness to the bottom thickness is 1:1.5.Also when edge-to-middle ratio in bottom is about 1:1.5,a better forming product can be received.The best bottom shape in these experiments will be convex based on the forming results.The grain will be refined obviously after the extrusion.Also the microstructures will be shown as streamlines.And these lines will be well agreement with the mold in the corner. 展开更多
关键词 AZ31 magnesium alloy Three-channel joint SAND Experiments and the finite element Die angle
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Thoughts about the Innovation of Mathematics Teaching Mode in Higher Vocational Colleges from the Viewpoint of “Task List” 被引量:1
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作者 Guijuan Tian 《Review of Educational Theory》 2020年第1期33-37,共5页
With the reform of talent demand mode in China,in today’s society,the need for talents of enterprises are more inclined to application-type vocational and technical talents,this has created enormous opportunities for... With the reform of talent demand mode in China,in today’s society,the need for talents of enterprises are more inclined to application-type vocational and technical talents,this has created enormous opportunities for the growing of higher vocational colleges which are the incubation base for applied talents,at the same time,it also exposes the practical problems of the backwardness of the current mathematics teaching mode in higher vocational colleges,thus brings unfavorable influence on the implementation of the talent cultivation program in higher vocational colleges,“Task list”is one of the teaching requirements put forward by China’s educational reform in the new age,and the important direction for higher vocational colleges to reform the mathematics teaching mode in the new age. 展开更多
关键词 “Task list” Higher VOCATIONAL COLLEGES Mathematics teaching mode REFORM
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Seismic response comparison and sensitivity analysis of pile foundation in liquefiable and non-liquefiable soils 被引量:6
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作者 Jia Kemin Xu Chengshun +3 位作者 Du Xiuli Cui Chunyi Dou Pengfei Song Jia 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2023年第1期87-104,共18页
Case history investigations have shown that pile foundations are more critically damaged in liquefiable soils than non-liquefiable soils.This study examines the differences in seismic response of pile foundations in l... Case history investigations have shown that pile foundations are more critically damaged in liquefiable soils than non-liquefiable soils.This study examines the differences in seismic response of pile foundations in liquefiable and non-liquefiable soils and their sensitivity to numerical model parameters.A two-dimensional finite element(FE)model is developed to simulate the experiment of a single pile foundation centrifuge in liquefiable soil subjected to earthquake motions and is validated against real-world test results.The differences in soil-pile seismic response of liquefiable and non-liquefiable soils are explored.Specifically,the first-order second-moment method(FOSM)is used for sensitivity analysis of the seismic response.The results show significant differences in seismic response for a soil-pile system between liquefiable and non-liquefiable soil.The seismic responses are found to be significantly larger in liquefiable soil than in non-liquefiable soil.Moreover,the pile bending moment was mainly affected by the kinematic effect in liquefiable soil,while the inertial effect was more significant in non-liquefiable soil.The controlling parameters of seismic response were PGA,soil density,and friction angle in liquefiable soil,while the pile bending moment was mainly controlled by PGA,the friction angle of soil,and shear modulus of loose sand in non-liquefiable soil. 展开更多
关键词 liquefiable non-liquefiable finite element analysis pile foundation seismic response sensitivity analysis
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Ground-borne vibrations induced by impact pile driving: experimental assessment and mitigation measures
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作者 A.Colaço A.M.Abouelmaty P.Alves Costa 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2023年第1期105-115,共11页
Impact pile driving is an interesting technique for the construction of deep foundations from a practical and economical point of view.However,the generalization of this technique can be restricted due to the excessiv... Impact pile driving is an interesting technique for the construction of deep foundations from a practical and economical point of view.However,the generalization of this technique can be restricted due to the excessive vibration levels that can be generated,which can be especially problematic in residential areas.However,different mitigation measures can be applied to prevent excessive vibration levels inside buildings located near construction sites.To compare its efficiency through a numerical prediction tool,two experimental test sites are first presented and characterized.From the results obtained,it was found that the construction of an open trench near the impact source can be used as an efficient mitigation measure to reduce the maximum vibration levels evaluated in this study. 展开更多
关键词 impact pile driving ground-borne vibrations experimental and numerical analysis mitigation measures
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Complete Coverage Path Planning Based on Improved Area Division
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作者 Lihuan Ma Zhuo Sun Yuan Gao 《World Journal of Engineering and Technology》 2023年第4期965-975,共11页
It is difficult to solve complete coverage path planning directly in the obstructed area. Therefore, in this paper, we propose a method of complete coverage path planning with improved area division. Firstly, the bous... It is difficult to solve complete coverage path planning directly in the obstructed area. Therefore, in this paper, we propose a method of complete coverage path planning with improved area division. Firstly, the boustrophedon cell decomposition method is used to partition the map into sub-regions. The complete coverage paths within each sub-region are obtained by the Boustrophedon back-and-forth motions, and the order of traversal of the sub-regions is then described as a generalised traveling salesman problem with pickup and delivery based on the relative positions of the vertices of each sub-region. An adaptive large neighbourhood algorithm is proposed to quickly obtain solution results in traversal order. The effectiveness of the improved algorithm on traversal cost reduction is verified in this paper through multiple sets of experiments. . 展开更多
关键词 Generalized Traveling Salesman Problem with Pickup and Delivery Com-plete Coverage Path Planning Boustrophedon Cellular Decomposition Adaptive Large-Neighborhood Search Algorithm Mobile Robot
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Assessment of bearing performance degradation via extension and EEMD combined approach 被引量:18
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作者 LIU Yu-mei ZHAO Cong-cong +3 位作者 XIONG Ming-ye ZHAO Ying-hui QIAO Ning-guo TIAN Guang-dong 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第5期1155-1163,共9页
As a key component in rotating machinery, the operating reliability of bearing influences the performance and service life of the equipment directly. In order to describe bearing performance degradation(BPD) process e... As a key component in rotating machinery, the operating reliability of bearing influences the performance and service life of the equipment directly. In order to describe bearing performance degradation(BPD) process effectively, an assessment approach combining extension and ensemble empirical mode decomposition(EEMD) was proposed. First, the extension was utilized to construct the matter-element of bearing operating state, and the energy moment of intrinsic mode functions(IMFs) was used as characteristic parameter of the matter-element. Then, to determine classical domains of characteristic parameters, the mathematical statistics method was adopted. Finally, the BPD was analyzed qualitatively and quantitatively according to the comprehensive correlation degree of bearing current operating state related to its healthy state. The analytic results of bearing test-rig show that the proposed method indicates the incipient fault approximately occurring in the 81 st hour, and the method also quantitatively presents the degree of BPD. By contrast, the BPD assessment based on time-domain features extraction method could not achieve the above two results effectively. 展开更多
关键词 BEARING performance degradation ASSESSMENT EXTENSION ENSEMBLE empirical mode decomposition MATHEMATICAL STATISTICS
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On Physical and Mechanical Behavior of Natural Marine Intermediate Deposits 被引量:5
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作者 石名磊 邓学钧 《China Ocean Engineering》 SCIE EI 2005年第1期111-119,共9页
Coastal structures may be built on natural sedimentary intermediate grounds, which mainly consist of silty soils and fine sandy soils. In this study, extensive field and laboratory tests were performed on the natural ... Coastal structures may be built on natural sedimentary intermediate grounds, which mainly consist of silty soils and fine sandy soils. In this study, extensive field and laboratory tests were performed on the natural marine intermediate deposits to demonstrate the difference in behavior between natural marine clayey soils and natural marine intermediate deposits. The natural intermediate deposits have almost the same ratios of natural water content to liquid limit as those of the soft natural marine clays, but the former have much higher in-situ strength and sensitivity than the latter. The research results indicate that grain size distributions of soils affect significantly tip resistance obtained in field cone penetration tests. The mechanical parameters of natural marine intermediate deposits are also significantly affected by sample disturbance due to their high sensitivity and relatively large permeability. Unconfined compression shear tests largely underestimate the strength of natural marine intermediate soils. The triaxial consolidated compression shear tests with simulated in-situ confined pressure give results much better than those of uncomfined compression shear tests. 展开更多
关键词 clayey soils filed tip resistance grain size distributions liquid limit natural marine intermediate deposits natural water content laboratory strength
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Vehicle Planar Motion Stability Study for Tyres Working in Extremely Nonlinear Region 被引量:8
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作者 LIU Li SHI Shuming +1 位作者 SHEN Shuiwen CHU Jiangwei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2010年第2期185-194,共10页
Many researches on vehicle planar motion stability focus on two degrees of freedom(2DOF) vehicle model, and only the lateral velocity (or side slip angle) and yaw rate are considered as the state variables. The st... Many researches on vehicle planar motion stability focus on two degrees of freedom(2DOF) vehicle model, and only the lateral velocity (or side slip angle) and yaw rate are considered as the state variables. The stability analysis methods, such as phase plane analysis, equilibriums analysis and bifurcation analysis, are all used to draw many classical conclusions. It is concluded from these researches that unbounded growth of the vehicle motion during unstable operation is untrue in reality thus one limitation of the 2DOF model. The fundamental assumption of the 2DOF model is that the longitudinal velocity is treated as a constant, but this is intrinsically incorrect. When tyres work in extremely nonlinear region, the coupling between the vehicle longitudinal and lateral motion becomes significant. For the purpose of solving the above problem, the effect of vehicle longitudinal velocity on the stability of the vehicle planar motion when tyres work in extremely nonlinear region is investigated. To this end, a 3DOF model which introducing the vehicular longitudinal dynamics is proposed and the 3D phase space portrait method is employed for visualization of vehicle dynamics. Through the comparisons of the 2DOF and 3DOF models, it is discovered that the vehicle longitudinal velocity greatly affects the vehicle planar motion, and the vehicle dynamics represented in phase space portrait are fundamentally different from that of the 2DOF model. The vehicle planar motion with different front wheel steering angles is further represented by the corresponding vehicle route, yaw rate and yaw angle. These research results enhance the understanding of the stability of the vehicle system particularly during nonlinear region, and provide the insight into analyzing the attractive region and designing the vehicle stability controller, which will be the topics of future works. 展开更多
关键词 vehicle dynamics steering stability nonlinear dynamics phase space
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A Coastal Ocean Model of Semi-Implicit Finite Volume Unstructured Grid 被引量:5
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作者 耿艳芬 王志力 《China Ocean Engineering》 SCIE EI 2012年第2期277-290,共14页
A two-dimensional coastal ocean model based on unstructured C-grid is built, in which the momentum equation is discretized on the faces of each cell, and the continuity equation is discretized on the cell. The model i... A two-dimensional coastal ocean model based on unstructured C-grid is built, in which the momentum equation is discretized on the faces of each cell, and the continuity equation is discretized on the cell. The model is discretized by semi-implicit finite volume method, in that the free surface is semi-implicit and the bottom friction is implicit, thereby removing stability limitations associated with the surface gravity wave and friction. The remaining terms in the momentum equations are discretized explicitly by integral finite volume method and second-order Adams-Bashforth method. Tidal flow in the polar quadrant with known analytic solution is employed to test the proposed model. Finally, the performance of the present model to simulate tidal flow in a geometrically complex domain is examined by simulation of tidal currents in the Pearl River Estuary. 展开更多
关键词 finite volume method UNSTRUCTURED C-grid coastal ocean modeling
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Equivalent bending stiffness of simply supported preflex beam bridge with variable cross-section 被引量:5
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作者 杨明 黄侨 王德军 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2010年第1期13-17,共5页
In order to understand mechanical characters and find out a calculating method for preflex beams used in particular bridge engineering projects, two types of simply supported preflex beams with variable crosssection, ... In order to understand mechanical characters and find out a calculating method for preflex beams used in particular bridge engineering projects, two types of simply supported preflex beams with variable crosssection, preflex beam with alterative web depth and preflex beam with aherative steel flange thickness, are dis- cussed on how to achieve the equivalent moment of inertia and Young' s modulus. Additionally, methods of cal- culating the equivalent bending stiffness and post-cracking deflection are proposed. Results of the experiments on 6 beams agree well with the theoretical analysis, which proves the correctness of the proposed formulas. 展开更多
关键词 variable cross-section preflex beam equivalent moment of inertia equivalent bending stiffness
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Empirical analysis of carbon tariff's effect on the export structure of China's manufacturing industry and social welfare based on the GTAP model 被引量:3
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作者 Yan Li Mengmeng Wang +1 位作者 Yi Sui Qingbo Huang 《Chinese Journal of Population,Resources and Environment》 2016年第1期1-10,共10页
In recent years,carbon emissions have gradually evolved from an environment issue into a political and economic one.Carbon tariff has brought about new trade barriers of developed countries,and in order to enhance the... In recent years,carbon emissions have gradually evolved from an environment issue into a political and economic one.Carbon tariff has brought about new trade barriers of developed countries,and in order to enhance the industrial competitiveness of developed countries,it will produce unfavorable impact on developing countries.Concentrated on the manufacturing industry,which is the most intensive high-carbon industry in China's export structure,this article studies the relationship between carbon tariff policy and industry structure of export trade and builds up a relation between climate change and international trade.First,by means of establishing a partial equilibrium model,it applies geometric analysis and mathematical analysis to compute the impact on China's manufacturing export trade and the consequences of the introduction of the US carbon tariff to China's manufacturing industry that has already imposed a domestic shipping carbon tax.Furthermore,with the application of the GTAP model,it estimates the overall economic and welfare effects on China's manufacturing industry if the US and Europe introduce carbon tariff by means of four ways,and then analyzes the influence on China's manufacturing industry export structure and social welfare as well.The result shows that the introduction of the US carbon import tariff lowers China's export price and export volume,and the implementation of a domestic carbon tax justifies a higher export price and a lower export volume for China.However,the degree of export reduction is smaller than that under the effect of the US carbon tariff.In the case of developed countries imposing carbon tariff on China's energy-intensive industries,such as chemical rubber products,oil and coal-processing industry and paper industry,whose export would be reduced,the negative impact on the paper industry is the severest,which will decrease the paper industry's export ranging from 1.79%to 6.05%,whereas the other industries' export will increase.Anyhow,it will promote China's manufacturing industry to adjust the export structure to a certain extent.In addition,it will lead to a decrease in China's welfare,with a decrease between $2,134 billion and $8,347 billion.Finally,this paper provides information on international coordination,export structure adjustment and green manufacturing adjustment as a reference for the development of China's manufacturing industry. 展开更多
关键词 carbon tariff manufacturing industry export structure social welfare GTAP model
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Derivation of Parametric Tropical Cyclone Models for Storm Surge Modeling 被引量:2
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作者 王志力 陆永军 耿艳芬 《China Ocean Engineering》 SCIE EI 2010年第2期245-254,共10页
In this paper, the parametric tropical cyclone models for storm surge modeling are further developed. Instead of tangential wind speed via cyclostrophic balance and radial wind speed using a simple formulation of defe... In this paper, the parametric tropical cyclone models for storm surge modeling are further developed. Instead of tangential wind speed via cyclostrophic balance and radial wind speed using a simple formulation of defection angle, the analyrical expressions of tangential and radial wind speed distribution are derived from the governing momentum equations based on the general symmetric pressure distribution of Holland and Fujita. The radius of the maximum wind is estimated by tropical cyclone wind structure which is characterized by the radial extent of special wind speed. The shape parameter in the pressure model is estimated by the data of several tropical cyclones that occurred in the East China Sea. Finally, the Fred cyclone (typhoon 199417) is calculated, and comparisons of the measured and calculated air pressures and wind speed are presented. 展开更多
关键词 tropical cyclone parametric tropical cyclone model storm surge radius of maxirmun wind shapeparameter
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Rheological Behavior of Basalt Fiber Reinforced Asphalt Mastic 被引量:2
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作者 顾兴宇 XU Tingting NI Fujian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第5期950-955,共6页
The characters of basalt fiber are analyzed and compared with commonly used fibers. The rheological behaviors of the basalt fiber reinforced asphalt mastic are investigated by the dynamic shear rheological tests and t... The characters of basalt fiber are analyzed and compared with commonly used fibers. The rheological behaviors of the basalt fiber reinforced asphalt mastic are investigated by the dynamic shear rheological tests and the repeated creep tests. The results show that basalt fiber has excellent reinforced performances, such as high asphalt absorption ratio, low water absorption ratio, high tensile strength, high elastic modulus and high temperature stability. The rutting factor of the fiber reinforced asphalt mastic is higher than the plain asphalt mastic and the reinforced effects are more remarkable under high temperature. The rheological performances of the asphalt mastic demonstrate a good linear relationship between different temperature and loading frequency. The creep stiffness modulus of the asphalt mastic at different loading time can be expressed by power function. Improved Burgers model is used to represent the rheological behaviors of the asphalt mastic with basalt fiber and the model parameters are estimated. 展开更多
关键词 basalt fiber asphalt mastic dynamic shear rheological test repeated creep test rheological model
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Evolution of aggregate surface texture due to tyre-polishing 被引量:2
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作者 陈先华 B.STEINAUER 王大为 《Journal of Central South University》 SCIE EI CAS 2011年第1期259-265,共7页
Three kinds of aggregates were polished by genuine pneumatic rubber tyres.The initial states of surface texture and dynamic friction coefficient were measured and their developments in polishing process were monitored... Three kinds of aggregates were polished by genuine pneumatic rubber tyres.The initial states of surface texture and dynamic friction coefficient were measured and their developments in polishing process were monitored.The characterizations of height distribution and power spectral density of aggregate surface texture were estimated.The changes of micro-texture were also investigated based on a fractal filtering method with sound theoretical backgrounds of rubber friction on rough surfaces.Global height reduction and differential removal of mineral component are observed in polishing process.It is concluded that the tyre-polishing action plays the critical roles in the micro-scale texture,and the evolution of friction of aggregate is governed by the micro-texture changes due to the differential removal of mineral component. 展开更多
关键词 tyre polishing dynamic friction coefficient aggregate surface texture MICRO-TEXTURE
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Study on How to Design Knitted Fabric Pattern with Mathematical Theory 被引量:2
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作者 陈莉 张蕊 叶介茂 《Journal of Donghua University(English Edition)》 EI CAS 2009年第2期204-206,共3页
To improve design capabilities for the knitted fabric pattern,a preliminary study is carried out for the design method.Based on mathematical theory,pattern could be created automatically by computer with inputting dif... To improve design capabilities for the knitted fabric pattern,a preliminary study is carried out for the design method.Based on mathematical theory,pattern could be created automatically by computer with inputting different parameters for mathematical functions.The knitted fabric simulation is realized by M1 CAD pattern preparation system of STOLL Company.In the pattern,different color unit is replaced by obverse stitch with different color,or by obverse stitch and reverse stitch with the same color separately,after that the effects of knitted fabrics could be simulated.Designing with this method,it would not only help to acquire a great of diversity patterns,but also improve design efficiency and save cost. 展开更多
关键词 knitted fabric mathematical theory patterndesign CAD fabric simulation
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Experimental Study of RC Beams Strengthened with CFRP Sheets Under Sustaining Loads 被引量:1
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作者 王文炜 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第3期82-85,共4页
Seven reinforced concrete ( RC ) beams strengthened in flexure using carbon fiber reinforced polymer (CFRP) sheets subjected to different sustaining loads were tested. The effects of initial load and load history ... Seven reinforced concrete ( RC ) beams strengthened in flexure using carbon fiber reinforced polymer (CFRP) sheets subjected to different sustaining loads were tested. The effects of initial load and load history on the ultimate strength of strengthened RC beams were examined by externally bonded CFRP sheets. The main experimental parameters included different levels of sustaining load at the time of strengthening, and load history. Experimental results show that sustaining load levels at the time of strengthening have important influences on the ultimate strength of strengthened RC beams. If the initial load is the same, the ultimate strength of RC beams strengthened with CFRP sheets is almost the same regardless of load history at the time of strengthening. 展开更多
关键词 CFRP RC beams sustaining load experimental study
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Sensitivity analysis method for increasing the passenger demands of parking and riding 被引量:1
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作者 邓卫 潘艳荣 郭唐仪 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第6期859-862,共4页
Focused on finding out the relationship between passenger demands of P&R and its influencing factors, a nested-logit mode choice model was developed based on the characteristic of different modes and transfer rule... Focused on finding out the relationship between passenger demands of P&R and its influencing factors, a nested-logit mode choice model was developed based on the characteristic of different modes and transfer rules. The utility functions were given respectively according to the characteristic of each alternative. Passenger demands of different modes between O-D pairs were obtained by making use of the binary logit model. Then an equilibrium model for different modes was proposed. Under this condition, the approximate relationship between passenger demands of different modes and their characteristic indexes was modeled by the sensitivity analysis method. Shift volume among different modes was achieved by utilizing this model when their characteristic indexes were changed. A case study indicates that the model and algorithm presented in this paper are effective. 展开更多
关键词 nested-logit model parking and riding (P&R) sensitivity analysis utility function passenger demands
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Partial Improvement of Traditional Grey-Markov Model and Its Application on Fault Prediction 被引量:1
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作者 Li Yongping Jia Cili 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2017年第4期449-455,共7页
Modeling experiences of traditional grey-Markov show that the prediction results are not accurate when analyzed data are rare and fluctuated.So it is necessary to revise or improve the original modeling procedure of t... Modeling experiences of traditional grey-Markov show that the prediction results are not accurate when analyzed data are rare and fluctuated.So it is necessary to revise or improve the original modeling procedure of the grey-Markov(GM)model.Therefore,a new idea is brought forward that the Markov theory is used twice,where the first time is to extend the original data and the second to calculate and estimate the residual errors.Then by comparing the original data sequence from a fault prediction case with the simulation sequence produced by the use of GM(1,1) and the new GM method,results are conforming to the original data.Finally,an assumption of GM model is put forward as the future work. 展开更多
关键词 grey-Markov model GM(1 1) residual error
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Delay-dependent Stability Analysis and Stabilization of Discrete-time Singular Delay Systems 被引量:5
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作者 SUN Xin ZHANG Qing-Ling +2 位作者 YANG Chun-Yu SHAO Yong-Yun SU Zhan 《自动化学报》 EI CSCD 北大核心 2010年第10期1477-1483,共7页
关键词 自动化系统 稳定性 方法 实验
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Research on the influence of the fly ash on the concrete carbonation 被引量:2
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作者 Chen Ce Zhong Jianchi 《Engineering Sciences》 EI 2011年第2期93-96,共4页
The influence of fly ash on the fresh properties, mechanical properties and carbonation properties were studied in this paper. The performance of a kind of curing agent which was applied to the hardened concrete surfa... The influence of fly ash on the fresh properties, mechanical properties and carbonation properties were studied in this paper. The performance of a kind of curing agent which was applied to the hardened concrete surface was evaluated. Incorporating large volume of fly ash will risk the concrete carbonation. The curing agent could prevent the concrete carbonation, and the mechanism was explained. 展开更多
关键词 CONCRETE fly ash curing agent
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