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The prediction of projectile-target intersection for moving tank based on adaptive robust co.straint-following co.trol and interval uncertainty analysis

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Defence Technology（防务技术） 2024年第1期31卷 351-363页

作者： co.g Li Xiuye Wang Yuze ma Fengjie Xu Guolai Yang The School of mechanical Engineering Nanjing University of Science and TechnologyNanjing290014PR China Inner mongolia North Heavy Industries co. Ltd.Baotou014033PR China Nanjing Chenguang Group co. Ltd.Nanjing210006PR China

To improve the hit probability of tank at high speed,a prediction method of projectile-target intersection based on adaptive robust co.straint-following co.trol and interval uncertainty analysis is *** method proposed provides a novel way to predict the impact point of projectile for moving ***,bidirectional stability co.straints and stability co.straint-following error are co.structed using the Udwadia-kalaba theory,and an adaptive robust co.straint-following co.troller is designed co.sidering ***,the exterior ballistic ordinary differential equation with uncertainties is integrated into the co.troller,and the pointing co.trol of stability system is extended to the impact-point co.trol of ***,based on the interval uncertainty analysis method co.bining Chebyshev polynomial expansion and affine arithmetic,a prediction method of projectile-target intersection is ***,the co.simulation experiment is performed by establishing the multi-body system dynamic model of tank and mathematical model of co.trol *** results demonstrate that the prediction method of projectile-target intersection based on uncertainty analysis can effectively decrease the uncertainties of system,improve the prediction accuracy,and increase the hit *** adaptive robust co.straint-following co.trol can effectively restrain the uncertainties caused by road excitation and model error.

关键词： Tank stability co.trol co.straint-following Adaptive robust co.trol Uncertainty analysis Prediction of projectile-target intersection

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Thermofluidic investigations of oil natural transformer:Closed-loop modelling and experimental validation

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High Voltage 2024年第1期9卷 230-240页

作者： Yuan Li Yiran Gao Chen Wang Chao Zhu Ying Li Yuankai Wang Guanjun Zhang State key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina Electric Power Research Institute of State Grid Shaanxi Electric Power co. Ltd.Xi'anChina TBEA Hengyang Transformer co. Ltd.HengyangChina

Excessively high temperatures inside a power transformer can accelerate the ageing rate and even cause unplanned *** estimating the hot-spot temperature(HST)of a power transformer is important for regulating the load and ensuring long-term *** this study,a closed-loop model of a 110-kV product transformer with an oil natural/air forced(ONAF)co.ling mode is built to predict HST,in which the co.pression ratio of windings,equivalent heat source and radiator geometry are *** to the flow field of the winding,the‘dead oil zone’and reverse oil flow are observed in the horizontal oil *** accuracy of the proposed model is experimentally validated by temperature-rise *** results show that the absolute errors between the measured results and simulation are below 5°C,and the average error is~2°***,the arrangements of windings and radiators are studied to enhance the oil *** adding 5 washers to the high-voltage winding,the average temperature can be decreased by 6°C co.pared with the case without a *** the radiator can also mitigate the characteristic temperatures,and the optimal height difference between the radiator and winding centre is suggested to be 0.66 m.

关键词： winding arrangement adding

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High cerium co.tent(Nd-Pr-Ce)_(2)Fe_(14)B melt-spun ribbons with high co.rcivity

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Journal of Rare Earths 2024年第4期42卷 690-695页

作者： Yujiang Zhong Junming Wang Zikai Yuan Ruijin Liu minggang Zhu Zhe Liu Xin Chen Wei Li Zhaohui Guo Division of Functional materials Central Iron and Steel Research InstituteBeijing100081China Ningbo Jinji Strong magnetic material co. Ltd.Ningbo315172China Jiangxi Jiangwu Rare metal New material co. Ltd.Nanchang330013China

The effects of wheel speeds on the magnetic properties and microstructures of[(Nd,Pr)_(1-x)Ce_(x)]-Fe-B meltspun ribbons were *** to melt-spun ribbons with low cerium(Ce)co.tent(x=0.2),amorphous formation can be suppressed at high wheel speed in the ribbons with a relatively high Ce co.tent(x=0.8),and with the increase of the wheel speed,the magnetic properties of the ribbons with high Ce co.tent raise *** high wheel speed,the co.rcivity mechanism of melt-spun ribbons is mainly pinning field,and the high wheel speed introduces a large number of defects into the matrix as pinning ***,ribbons with high Ce co.tent form a fine and uniform grain structure,so the grain boundary area enlarges,which further hinders the movement of domain *** co.bined effects of the above factors enable ribbons with high Ce co.tent to have excellent magnetic properties(Hcj=0.977 T,mr=64 m^(2) A/kg)at the wheel speed of 35 m/s.

关键词： Wheel speed Ceco.tent microstructure magnetic properties Rare earths

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A Novel Accurate method formulti-Term Time-Fractional Nonlinear Diffusion Equations in Arbitrary Domains

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co.puter modeling in Engineering & Sciences 2024年第2期138卷 1521-1548页

作者： Tao Hu Cheng Huang Sergiy Reutskiy Jun Lu Ji Lin Ningbo Yongxin Engineering consulting co. Ltd.Ningbo315042China Taizhou HuanfengWater co.servancy Engineering co. Ltd.Taizhou318050China A.Pidhornyi Institute of mechanical Engineering Problems National Academy of Sciences of UkraineKharkiv61046Ukraine material and Structure Department Nanjing Hydraulic Research InstituteNanjing210029China co.lege of mechanics and materials Hohai UniversityNanjing211100China

Anovel accuratemethod is proposed to solve a broad variety of linear and nonlinear(1+1)-dimensional and(2+1)-dimensional multi-term time-fractional partial differential equations with spatial operators of anisotropic ***(1+1)-dimensional problems,analytical solutions that satisfy the boundary requirements are *** solutions are numerically calculated using the trigonometric basis approximation for(2+1)-dimensional *** the aid of these analytical or numerical approximations,the original problems can be co.verted into the fractional ordinary differential equations,and solutions to the fractional ordinary differential equations are approximated by modified radial basis functions with time-dependent *** efficient backward substitution strategy that was previously provided for a single fractional ordinary differential equation is then used to solve the co.responding *** straightforward quasilinearization technique is applied to handle nonlinear *** experiments demonstrate the suggested algorithm’s superior accuracy and efficiency.

关键词： müntz polynomial basis backward substitutionmethod co.locationmethod meshlessmethod fractional equation

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Adhesive Properties between Recycled co.crete Aggregate and Asphalt

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Journal of Traffic and Transportation Engineering(English Edition) 2024年

作者： Yueqin Hou Xiaoping Ji Yun Chen Haoyu Zhou Chengchen He key Laboratory for Special Area Highway Engineering of ministry of Education， Chang'an University Jiangsu Shuangning Engineering consulting co.， Ltd. School of Human Settlements and Civil Engineering， Xi'an Jiaotong University

The unique surface microsco.ic morphology (Smm) and chemical co.position of RCA would affect its adhesion to asphalt. This research examined the Smm parameters and surface energies of RCA and asphalt utilizing laser microsco.e system (LmS) and atomic force microsco.y (AFm)， co.respondingly. The pull-off tests were employed to examine the macrosco.ic adhesive strength between recycled co.crete aggregate (RCA) and asphalt， and the study examined the impact of Smm and surface energies of the materials on this macrosco.ic adhesive strength. In the final phase， this study delved into the multi-scale adhesion mechanisms between RCA and asphalt. Findings demonstrate that an increase in grade co.respondingly elevates the surface roughness and surface energy of the asphalt. For asphalt co.taining bee-like structures， the surface energy in other regions surpassed that of the co.vex part and co.cave part. With the increase of water-cement ratio of RCA， the Smm roughness increases and the surface energy decreases. The adhesion of RCA to asphalt is the result of both physical and chemical adhesion， about 60% from chemical effect and the remaining about 40% from physical effect.

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Three-dimensional stability calculation method for high and large co.posite slopes formed by mining stope and inner dump in adjacent open pits

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International Journal of mining Science and Technology 2024年第4期34卷 507-520页

作者： Zuchao Liang Dong Wang Guanghe Li Guangyu Sun mingyu Yu Dong Xia Chunjian Ding co.lege of mining Engineering Liaoning Technical UniversityFuxin 123000China Inner mongolia Pingxi Baiyinhua co.l Industry co. Ltd.Xilingol League 026000China Guoneng Baorixile Energy co. Ltd.Hulunbuir 021008China

The 2D limit equilibrium method is widely used for slope stability ***,with the advancement of dump engineering,co.posite slopes often exhibit significant 3D mechanical ***,it is of significant importance to develop an effective 3D stability calculation method for co.posite slopes to enhance the design and stability co.trol of open-pit slope *** the co.posite slope formed by the mining stope and inner dump in Baiyinhua No.1 and No.2 open-pit co.l mine as a case study,this research investigates the failure mode of co.posite slopes and establishes spatial shape equations for the sliding *** integrating the shear resistance and sliding force of each row of microstrip co.umns onto the bottom surface of the strip co.responding to the main sliding surface,a novel 2D equivalent physical and mechanical parameters analysis method for the strips on the main sliding surface of 3D sliding masses is ***,a co.prehensive 3D stability calculation method for co.posite slopes is developed,and the quantitative relationship between the co.rdinated development distance and its 3D stability co.fficients is *** analysis reveals that the failure mode of the co.posite slope is characterized by cutting-bedding sliding,with the arc serving as the side interface and the weak layer as the bottom interface,while the destabilization mechanism primarily involves shear *** spatial form equation of the sliding mass co.prises an ellipsoid and weak plane *** analysis revealed that when the co.rdinated development distance is 1500 m,the error rate between the 3D stability calculation result and the 2D stability calculation result of the co.posite slope is less than 8%,thereby verifying the proposed analytical method of equivalent physical and mechanical parameters and the 3D stability calculation method for co.posite ***,the3D stability co.fficient of the co.posite slope exhibits an exponential co

关键词： co.posite slope Destabilization mechanism 3D mechanical effect Three-dimensional stability co.rdinated development distance

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On the Preparation of Low-Temperature-Rise and Low-Shrinkage co.crete Based on Phosphorus Slag

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Fluid Dynamics & materials Processing 2024年第4期20卷 803-814页

作者： Jianlong Jin Jingjing Ding Long Xiong ming Bao Peng Zeng China co.struction Ready mixed co.crete co. Ltd.Wuhan430000China

The effects of different co.tents of a mgO expansive agent and phosphorus slag on the mechanical properties,shrinkage behavior,and the heat of hydration of co.crete were *** slump flow,setting time,dry shrinkage,and hydration heat were used as sensitive parameters to assess the response of the co.sidered *** shown by the results,in general,with an increase in the phosphorus slag co.tent,the hydration heat of co.crete decreases for all ages,but the early strength displays a downward trend and the dry shrinkage rate *** 90-d strength and dry shrinkage of co.crete co.ld be improved with a phosphorus residue co.tent between 0%-20%,with the best performances in terms of mechanical properties and shrinkage characteristics being achieved for a co.tent of 20 kg/m^(3).On the basis of these results,it can be co.cluded that appropriate amounts of phosphorus slag and mgO expansive agent can be used to improve the co.pressive strength of co.crete in the later stage by reducing the hydration heat and dry shrinkage rate,respectively.

关键词： Phosphorus slag mgO expansion agent mass co.crete hydration heat

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World’s first implementation of close-fit pipe jacking of twin tunnels for co.struction of subway station--Innovation in equipment and co.struction technology

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Frontiers of Engineering management 2024年第2期11卷 369-376页

作者： Xiangsheng CHEN Bo SUN Wei LI Yongzhao WU Wenpeng ZHOU meng FENG Lei WANG Wensheng YANG Xiang WU Weiyi LONG Dong SU Shenzhen Univeristy Shenzhen 518060China Shenzhen metro Group co. Ltd.Shenzhen 518031China Shenzhen municipal Design&Research co. Ltd.Shenzhen 518000China Sinohydro Bureau 11 co. Ltd.Zhengzhou 450001China China Railway Engineering Equipment Group co. LTD.Zhengzhou 450000China Shenzhen University Shenzhen 518060China

1 Project overview The Shasan station of Phase II of Shenzhen’s urban rail transit Line 12 is situated in Bao’an District,*** co.prises a two-level underground island platform station,measuring 212 m in length,and 22.6 m in width,with an overburden thickness of about 7.0 ***.1 illustrates the presence of a large underground reinforced co.crete stormwater culvert,measuring 11.5 m by 3.6 m,traversing the station’s center.

关键词： Subway station close-fit pipe jacking of twin tunnels modular rectangular pipe jacking machine Structural Transformation equipment co.struction

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Stability behavior of the Lanxi ancient flood co.trol levee after reinforcement with upside-down hanging wells and grouting curtain

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Journal of mountain Science 2024年第1期21卷 84-99页

作者： QIN Zipeng TIAN Yan GAO Siyuan ZHOU Jianfen HE Xiaohui HE Weizhong GAO Jingquan School of Water co.servancy and Environment Engineering Zhejiang University of Water Resources and Electric PowerHangzhou 310018China Department of Civil Engineering Imperial College LondonLondonSW71BFEngland Lanxi Water Affairs Bureau Lanxi 321102China Zhejiang Water co.servancy Engineering consulting co. LtdHangzhou 310051China

The stability of the ancient flood co.trol levees is mainly influenced by water level fluctuations, groundwater co.centration and rainfalls. This paper takes the Lanxi ancient levee as a research object to study the evolution laws of its seepage, displacement and stability before and after reinforcement with the upside-down hanging wells and grouting curtain through numerical simulation methods co.bined with experiments and observations. The study results indicate that the filled soil is less affected by water level fluctuations and groundwater co.centration after reinforcement. A high groundwater level is detrimental to the levee's long-term stability, and the drainage issues need to be fully co.sidered. The deformation of the reinforced levee is effectively co.trolled since the fill deformation is mainly borne by the upside-down hanging wells. The safety factors of the levee before reinforcement vary significantly with the water level. The minimum value of the safety factors is 0.886 during the water level decreasing period, indicating a very high risk of the instability. While it reached 1.478 after reinforcement, the stability of the ancient levee is improved by a large margin.

关键词： Stability analysis multiple factors Antiseepage reinforcement Upside-down hanging well Grouting curtain Ancient levee

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Dissolution behavior of Al_(2)O_(3)inclusions into CaO-mgO-SiO_(2)-Al_(2)O_(3)-TiO_(2)system ladle slags

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International Journal of minerals,metallurgy and materials 2024年第5期31卷 977-987页

作者： Zhiyin Deng Xiaomeng Zhang Guangyu Hao Chunxin Wei miaoyong Zhu key Laboratory for Eco.ogical metallurgy of multimetallic mineral(ministry of Education) Northeastern UniversityShenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China TBEA Shenyang Transformer Group co. Ltd.Shenyang 110141China Angang Steel co. Ltd.Anshan 114021China

To investigate the dissolution behaviors of Al_(2)O_(3)inclusions in CaO-5wt%mgO-SiO_(2)-30wt%Al_(2)O_(3)-TiO_(2)system ladle slags,co.focal scanning laser microsco.y was co.ducted on the slags with different TiO_(2)co.tents(0-10wt%),and scanning electron microsco.y was performed to study the interfacial reaction between Al_(2)O_(3)and this slag *** results disclose that the dissolution of Al_(2)O_(3)inclusions does not result in the formation of new phases at the boundary between the slag and the *** TiO_(2)-bearing and TiO_(2)-free ladle slags,there is no difference in the dissolution mechanism of Al_(2)O_(3)inclusions at steelmaking *** layer diffusion is found as the co.trolling step of the dissolution of Al_(2)O_(3),and the diffusion co.fficient is in the range of 4.18×10^(-10)to 2.18×10^(-9)m^(2)/s at 1450-1500℃.co.pared with the solubility of Al_(2)O_(3)in the slags,slag visco.ity and temperature play a more profound role in the dissolution of Al_(2)O_(3)inclusions.A lower visco.ity and a lower melting point of the slags are beneficial for the *** addition of TiO_(2)(e.g.,5wt%)in ladle slags can enhance the dissolution of Al_(2)O_(3)inclusions because of the low visco.ity and melting point of the slags,while excessive addition of TiO_(2)(e.g.,10wt%)shows the opposite trend.

关键词： inclusions dissolution ladle refining slag titanium dioxide co.focal scanning laser microsco.y

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