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Investigation of dynamic seismic response in liquid-containing structures for nuclear reactors using the hybrid Eulerian-Lagrangian method 认领 引用
1
作者 Shi-Lin Chen Qing-Xi Yang +3 位作者 Qing-Zhou Yu Hao Xu Jian Chen Zhao-Xi Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第6期159-177,共19页
Liquid-containing structures,including steam generators,water-cooling systems,in-containment refueling water storage tanks,suppression tanks,and tritiated water storage facilities,are integral components of nuclear re... Liquid-containing structures,including steam generators,water-cooling systems,in-containment refueling water storage tanks,suppression tanks,and tritiated water storage facilities,are integral components of nuclear reactor systems and are crucial for ensuring operational safety and stability.Traditional seismic analysis methods often struggle to accurately predict the dynamic behavior of such structures,particularly under transient events such as earthquakes.This paper presents a comprehensive study that applies the hybrid Eulerian-Lagrangian method to analyze fluid-structure interactions within these structures.The efficacy of this method for capturing the complex dynamics induced by liquid movement is demonstrated through simulations conducted primarily in a vertical storage tank.A comparative analysis with traditional response-spectrum analysis methods underscores the limitations of conventional approaches,particularly in terms of accounting for nonlinear free-surface motions and dynamic velocity distributions.The structural response of the tank containing liquid calculated using the hybrid Eulerian-Lagrangian method is approximately twice that calculated using the response-spectrum method,whereas in the case of a tank without liquid,the response is the same.Additionally,a high dynamic stress distribution exists near the liquid level of the structure.This study addresses the intricate interplay between structural components and fluid dynamics,thereby extrapolating insights from tanks to enhance safety protocols and design considerations for future nuclear devices. 展开更多
关键词 Liquid-containing structures Nuclear reactors Seismic analysis methods Hybrid Euler-Lagrangian method Complex dynamics
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Numerical method for solving dynamical equations of multibody systems with nonholonomic constraints based on state-space method 认领 引用
2
作者 Jiajun Wu Xian Guo +3 位作者 Dingguo Zhang Yue Zhang Liang Li Kang Guo 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第7期505-520,共16页
In this paper,a new numerical solution method is proposed for dealing with differential-algebraic equations(DAEs)for dynamics of multibody systems with nonholonomic constraints.The nonholonomic constraints directly re... In this paper,a new numerical solution method is proposed for dealing with differential-algebraic equations(DAEs)for dynamics of multibody systems with nonholonomic constraints.The nonholonomic constraints directly restrict the velocity coor-dinates,resulting in no corresponding position constraint equations.Therefore,the traditional state-space method is insufficient to solve such DAEs.In the proposed state-space method,direct integration of the ordinary differential equations obtained from the index-1 DAEs,ensures that the acceleration constraints are satisfied and provides initial values for the dependent variables.Subsequently,position and velocity constraint equations are solved to update dependent variables,strictly ensuring satisfaction of constraints at three levels.Currently,LU decomposition is the most used method to define the state-space method.However,in order to ensure the accuracy and stability of the algorithm,coordinate identification is required at every time step,which reduces the computational efficiency.Therefore,in this paper,the state-space method defined by singular value decomposition(SVD)is proposed,which does not require frequent coordinate identification and improves the computational efficiency.Numerical exam-ples show that the state-space method based on SVD outperforms the LU decomposition in terms of computational efficiency and stability. 展开更多
关键词 Multibody system dynamics Nonholonomic constraints Differential algebraic equations State-space method
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Energy absorption mechanism and design method of anchor cable under dynamic-static coupling condition 认领 引用
3
作者 Qi Wang Jingxuan Liu +4 位作者 Mingzi Wang Bei Jiang Rugang Duan Shuo Xu Xuepeng Wang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第5期941-956,共16页
To effectively control the large deformation of the surrounding rock under complex conditions,it is often necessary to apply prestress to anchor cables.However,due to the influence of surrounding rock deformation,mini... To effectively control the large deformation of the surrounding rock under complex conditions,it is often necessary to apply prestress to anchor cables.However,due to the influence of surrounding rock deformation,mining disturbance,and strong impact,anchor cables are often in a dynamic and static coupling stress state.Therefore,it is crucial to study the dynamic and static coupling mechanical characteristics of anchor cables.Based on this,the self-developed dynamic and static coupling test equipment is developed.The dynamic and static coupling mechanical test of anchor cables is conducted.Test results indicate that the energy absorption for anchor cables under the initial load of 350 kN decreased by 69.8%compared to the condition without initial load,and the energy absorption efficiency increased by 6.6 times.The increase of initial load can improve its energy absorption efficiency,but it can also lead to a decrease in its energy absorption.The energy absorption and energy absorption efficiency shows a bilinear variation law with the increase of initial load.On this basis,the energy absorption calculation formula and the support design model of the anchor cable are established.It provides new ideas for the safety control of dynamic disasters in deep engineering. 展开更多
关键词 Anchor cable support Working load Dynamic and static coupling test Energy absorption characteristics Design method
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Element differential method for the multi-physics coupled contact analysis of high-temperature dynamic seal structure 认领 引用
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作者 Yong-Tong Zheng Wei-Long Fan +1 位作者 Xiao-Wei Gao Hua-Yu Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期460-476,共17页
High-temperature dynamic seals are the structures used to seal movable clearances in high-temperature environments.The essential components of these seals are the fiber-braided seal strips.When it is working,the strip... High-temperature dynamic seals are the structures used to seal movable clearances in high-temperature environments.The essential components of these seals are the fiber-braided seal strips.When it is working,the strip is subjected to a transverse preload,decreasing its porosity and restricting gas flow to achieve sealing.To implement seal design,efficient numerical analysis is essential,which is supposed to involve the deformation,heat transfer,seepage,and the interactions among these physical processes.In this paper,a nonlinear thermal-mechanics-seepage coupled contact model is used to describe the seal strips with circular sections.An element differential scheme is proposed to solve the coupled governing equations,and an iterative procedure based on the element differential method(EDM)tracks the contact interfaces,which further determines the range of boundary conditions of other physical fields.The proposed method simplifies the computation by avoiding integral evaluations and reducing matrix density.Two examples are implemented to verify the correctness of the proposed scheme and to predict the variations in physical variables of the seal structures.Furthermore,a comparison between the EDM and finite element method results indicates that the EDM is more efficient because of fewer contact iterations and a sparser coefficient matrix. 展开更多
关键词 Element differential method High-temperature dynamic seals Multi-physics coupled analysis Strong-form scheme
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Person re-identification method based on keypoint-based dynamic region partitioning and APLNet 认领 引用
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作者 Hongyi WANG Xirui YANG +2 位作者 Xinjun ZHU Limei SONG Yunpeng LI 《Optoelectronics Letters》 EI 2026年第4期243-249,共7页
To promote the technology of person re-identification(Re-ID)in intelligent video analysis,a new segmentation method of keypoint-based dynamic region partitioning(KDRP)and an improved adaptive average pooling layer lis... To promote the technology of person re-identification(Re-ID)in intelligent video analysis,a new segmentation method of keypoint-based dynamic region partitioning(KDRP)and an improved adaptive average pooling layer list network(APLNet)are proposed in this work.The KDRP addresses the limitations of traditional stripe segmentation methods avoiding the influence of shooting angles and pedestrian postures.The APLNet integrates the adaptive average pooling layer list(AAPLL)module and the priority circle loss(P-circle loss)to solve the problem of inconsistent size of feature map and promote the model performance respectively.Experimental results on different datasets have validated the effectiveness of the proposed method. 展开更多
关键词 adaptive average pooling layer traditional stripe segmentation methods adaptive average pooling layer list aplnet intelligent video analysisa segmentation method person re identification keypoint based dynamic region partitioning
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Coupled computational fluiddynamics–discrete-element method investigation of soil contact erosion under cyclic hydraulic loading:A multiscale perspective 认领 引用
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作者 Xianfeng Diao Guoqing Cai +3 位作者 Tao Liu Peiyun Zhang Yanlin Su Bangzheng Rao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4812-4830,共19页
Tidal waves,intermittent rainfall,and fluctuations in water levels,which create cyclic hydraulic gradients,can exacerbate the migration of fine particles within soils and lead to deterioration in stability.However,mac... Tidal waves,intermittent rainfall,and fluctuations in water levels,which create cyclic hydraulic gradients,can exacerbate the migration of fine particles within soils and lead to deterioration in stability.However,macroscale experimental methods struggle to capture the microscopic deformations that occur during seepage-induced erosion.Therefore,this study,which is based on the coupled computational fluid dynamics–discrete element method(CFD–DEM)coupling method,investigates the contact mechanical mechanisms that induce macroscopic deformation under cyclic hydraulic gradients by considering the effects of different amplitudes and frequencies.The results show that the erosion mass of fine particles increases in a stepwise manner,with a multipeak variation in the erosion rate,and both the erosion amount and intensity are greater under constant gradient conditions.Fine particles erode primarily near the contact surface and,after migration,accumulate mainly in the coarse particle layers close to the contact surface.Increasing the amplitude and frequency of the cyclic hydraulic gradient leads to more fine particle blockages within the coarse particle layer.The cyclic hydraulic gradient causes the contact force chain network to repeatedly break and reorganize,reducing the shear strengths of the soil and resulting in more pronounced anisotropy in the contact force distribution. 展开更多
关键词 Computational fluid dynamics–discrete element method(CFD–DEM)coupling Contact erosion Cyclic hydraulic gradients Macroscopic deformation Micromechanism
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Dynamic characteristics and sensitivity of water hammer problems in liquid propulsion system using lattice Boltzmann method with entropy limiter 认领 引用 被引量：1
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作者 Yuqi WEI Xianggeng WEI +4 位作者 Guoqiang HE Xiao ZHAO Jinying YE Xueren WANG Hongyu CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期18-34,共17页
The water hammer problem is an important issue in the dynamics of liquid propulsion system.This paper aims to use the Lattice Boltzmann Method(LBM)with entropy limiter to study the water hammer problems in propellant ... The water hammer problem is an important issue in the dynamics of liquid propulsion system.This paper aims to use the Lattice Boltzmann Method(LBM)with entropy limiter to study the water hammer problems in propellant feedlines.The dynamic characteristics of valve-closing water hammer and filling water hammer are investigated by this method,and the sensitivity of filling water hammer is analyzed with a single factor sensitivity analysis with 8 factors and 9 levels and a multi-factor sensitivity analysis with L27(313)orthogonal experiment based on range method.It is found that the solving result of LBM with entropy limiter is basically in good agreement with finite volume method,and using the entropy limiter can eliminate numerical oscillations when solving valve-closing water hammer problems and solve the numerical"blow up"when solving filling water hammer problems.It can be seen that the dynamic characteristics of valve-closing water hammer are relatively simple,while there are many factors that affect the filling water hammer and the degree of these effects varies.The effects on the maximum water hammer pressure are relatively uniform,but those on the water hammer response time vary greatly through the skewness analysis. 展开更多
关键词 Dynamic analysis Lattice Boltzmann method Liquid propulsion system Propellant transfer Sensitivity analysis Water hammer
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Dynamic quantitative deformation mapping of slip activities in NBSC superalloy using sampling moiré method 认领 引用 被引量：1
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作者 Xinyun XIE Qinghua WANG Xiaojun YAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期301-312,共12页
Quantitative assessment of microscale slip activities and plastic localizations is essential for understanding the complex deformation mechanisms in crystalline materials.However,few experimental studies have been abl... Quantitative assessment of microscale slip activities and plastic localizations is essential for understanding the complex deformation mechanisms in crystalline materials.However,few experimental studies have been able to dynamically measure the deformation fields of rapidly evolving slip activities at the microscale.In this study,we used the Sampling Moire?Method(SMM)to directly measure the dynamic deformation fields of slip activities in Nickel-Based Single-Crystal(NBSC)superalloy under in-situ tensile test,and the strain and displacement fields under the evolving microplastic events with intense slip activities around the notch of the NBSC superalloy specimen were obtained for the first time.The dynamic evolution of slip bands was quantitatively characterized through detailed statistical analysis of strains and displacements under different loads.The locations of the initial appearance of slip traces were successfully predicted by the regions of plasticity localization.The results show that the deformation fields exhibit both high spatial and temporal resolutions,enabling the capture of nanometer-scale displacement fields and visualization of the dynamic fluidity of slip accumulation.This method demonstrates the superiority of the dynamic characterization of the plastic deformation field at the microscale and the promise of its application for characterizing the slip activities of various crystalline metals. 展开更多
关键词 Dynamic deformation measurement Nickel-based single-crystal superalloys Plastic deformation Samplingmoire method Slip bands evolution
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Fixed-Time Bipartite Formation of Multi-Agent Systems Using Dynamic Event-Triggered Scheme 认领 引用
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作者 Longquan Ma Huarong Zhao +2 位作者 Liqin Zhou Linbo Xie Hongnian Yu 《Computers, Materials & Continua》 SCIE EI 2026年第6期1447-1462,共16页
This paper studies a sampling-based dynamic event-triggered fixed-time bipartite formation algorithm for a class of continuous-time multi-agent systems with communication constraints.First,a periodic sampling mechanis... This paper studies a sampling-based dynamic event-triggered fixed-time bipartite formation algorithm for a class of continuous-time multi-agent systems with communication constraints.First,a periodic sampling mechanism is designed to reduce the system’s communication frequency.Then,a dynamic event-triggered control algorithm based on auxiliary variables is developed for sampled-data systems to further reduce the system’s triggering frequency.Next,to enhance the convergence speed of the dynamic event-triggered control method,a dynamic event-triggered fixed-time bipartite formation control scheme is investigated.Finally,using Lyapunov stability theory,signed graph theory,and relevant inequalities,a rigorous theoretical proof of the stability of the proposed control protocol is provided,and the algorithm’s effectiveness is verified through simulation experiments. 展开更多
关键词 Sampled-data dynamic event-triggered fixed-time bipartite formation multi-agent systems
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An improved open-top dynamic chambers method for measuring the exchange fluxes of N2O,NO and NH3 from farmland 认领 引用
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作者 Minhang Tan Yining Hu +6 位作者 Yifei Song Zixuan Huang Yujing Mu Junfeng Liu Chenglong Zhang Pengfei Liu Yuanyuan Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第1期535-545,共11页
The application of nitrogen fertilizers in agricultural fields can lead to the release of nitrogen-containing gases(NCGs),such as NOx,NH3 and N2O,which can significantly impact regional atmospheric environmen... The application of nitrogen fertilizers in agricultural fields can lead to the release of nitrogen-containing gases(NCGs),such as NOx,NH3 and N2O,which can significantly impact regional atmospheric environment and con-tribute to global climate change.However,there remain considerable research gaps in the accurate measurement of NCGs emissions from agricultural fields,hindering the development of effective emission reduction strategies.We improved an open-top dynamic chambers(OTDCs)system and evaluated the performance by comparing the measured and given fluxes of the NCGs.The results showed that the measured fluxes of NO,N2O and NH3were 1%,2%and 7%lower than the given fluxes,respectively.For the determination of NH3 concentration,we employed a stripping coil-ion chromatograph(SC-IC)analytical technique,which demonstrated an absorption efficiency for atmospheric NH3 exceeding 96.1%across sampling durations of 6 to 60 min.In the summer maize season,we utilized the OTDCs system to measure the exchange fluxes of NO,NH3,and N2O from the soil in the North China Plain.Substantial emissions of NO,NH3 and N2O were recorded following fertilization,with peaks of 107,309,1239 ng N/(m2·s),respectively.Notably,significant NCGs emissions were observed following sus-tained heavy rainfall one month after fertilization,particularly with NH3 peak being 4.5 times higher than that observed immediately after fertilization.Our results demonstrate that the OTDCs system accurately reflects the emission characteristics of soil NCGs and meets the requirements for long-term and continuous flux observation. 展开更多
关键词 Open-top dynamic chambers Nitrogen-containing gases Soil emissions North China Plain Method evaluation
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Distributed Gain Scheduling Dynamic Event-Triggered Semi-Global Leader-Following Consensus of Input Constrained MASs Under Fixed/Switching Topologies 认领 引用
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作者 Meilin Li Tieshan Li Hongjing Liang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第4期888-902,共15页
In this paper,the semi-global leader-following consensus issue of multi-agent systems with constrained input under fixed and switching topologies is investigated via a distributed gain scheduling dynamic event-trigger... In this paper,the semi-global leader-following consensus issue of multi-agent systems with constrained input under fixed and switching topologies is investigated via a distributed gain scheduling dynamic event-triggered method.First,a novel distributed gain scheduling consensus protocol is proposed under fixed topology,which integrates time-varying gain and distributed parameter schedulers.This approach enhances the transient performance of consensus tracking by enlarging the gain parameter through the scheduler,while the reliance of the scheduler on global state information is eliminated via a distributed design method.Subsequently,a distributed dynamic event-triggered mechanism is introduced to reduce the controller updates,while the expression of the inter-event times mitigates its explicit reliance on the system matrix.Additionally,to eliminate the need for real-time monitoring of neighboring agents'states and continuous communication,a distributed dynamic self-triggered mechanism is developed.Next,our approaches are extended to solve the semi-global leader-following consensus problem under switching topologies.The average dwell time technique is employed to alleviate the limitations on the switching rate among multiple topologies.Finally,the theoretical analysis is validated through simulation results. 展开更多
关键词 Dynamic event-triggered/self triggered mechanism fixed/switching topologies gain scheduling control input constraints multi-agent systems
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Energy-Based Deep Learning Initialization Method Achieves Precise Evolution of Soliton Dynamics 认领 引用
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作者 Zhiyang Zhang Muwei Liu +3 位作者 Xiaowei Xing Kaixiang Zhang Xiwei Huang Wenjun Liu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期45-54,共10页
The precise modeling of strong nonlinear transient evolution in nonlinear dynamical systems,including soliton evolution,remains a long-term challenge.Deep learning models with powerful nonlinear fitting capabilities h... The precise modeling of strong nonlinear transient evolution in nonlinear dynamical systems,including soliton evolution,remains a long-term challenge.Deep learning models with powerful nonlinear fitting capabilities have become efficient tools for physical system modeling.However,existing initialization methods rely on statistical distribution assumptions and lack constraints from physical mechanisms,which easily lead to suboptimal solutions and severely limit model prediction accuracy and generalization.Based on the energy minimization principle of physical systems,this work proposes energy-based initialization(EBI).This method requires only prior structural knowledge of the physical system as input,without experimental data or architecture customization,to guide initial weights to align with the intrinsic dynamical structure of physical systems.The work further derives an upper bound on the distance between EBI initial weights and optimal weights for downstream tasks,and proves that its performance advantage increases monotonically with the expansion of model parameter scale.Validation across four typical physical scenarios shows that EBI outperforms classical initialization schemes across all metrics,while initialization for a model with 4.7 million parameters takes less than 5 minutes.This work fills the gap of specialized initialization methods in AI for physics,provides efficient support for tasks such as transient prediction of optical fiber laser and inverse sensing of laser structures,and is expected to open new directions for interdisciplinary research between artificial intelligence and physics. 展开更多
关键词 physical system modelinghoweverexisting initialization methods physical system modeling soliton dynamics learning models statistical distribution assumptions energy based initialization deep learning
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Sensitivity analysis of vibration characteristics and dynamic responses of a tracked vehicle 认领 引用 被引量：1
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作者 Xun Wang Xue Rui +3 位作者 Jinghong Wang Xiaoting Rui Guoping Wang Pingxin Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第3期323-348,共26页
This study aims to establish an integrated sensitivity analysis framework for optimization and design of the dynamic performance of mechanical systems such as tracked vehicles,by combining the direct differentiation m... This study aims to establish an integrated sensitivity analysis framework for optimization and design of the dynamic performance of mechanical systems such as tracked vehicles,by combining the direct differentiation method(DDM)with the linear multibody system transfer matrix method(linear MSTMM).The rigid-flexible coupled multibody system dynamics model of a tracked vehicle is established using the linear MSTMM and validated through the modal test.Building upon the existing DDM-based eigenvalue sensitivity analysis method within the linear MSTMM,the DDM is embedded into it to enable programmable and efficient computation of dynamic response sensitivities for mechanical systems.The proposed approach is used to quantitatively evaluate the sensitivities of both natural vibration characteristics(e.g.,natural frequencies and mode shapes)and transient dynamic responses of the tracked vehicle with respect to system parameters,successfully identifying critical structural parameters.Compared to conventional finite difference methods,the developed methodology eliminates sensitivity to perturbation step sizes.The contributions of this work lie in establishing a unified theoretical foundation and analysis framework for guiding dynamics optimization and design of mechanical systems,and extending the applicability of the linear MSTMM to sensitivity analysis of transient dynamic responses. 展开更多
关键词 Tracked vehicle Sensitivity analysis Vibration characteristics Dynamic responses Direct differentiation method Linear multibody system transfer matrix method
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On the dynamics and collisions of settling spheroidal particles 认领 引用 被引量：1
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作者 Xinyu Jiang Lihao Zhao Luca Brandt 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第1期49-63,共15页
In this study,we perform particle-resolved simulations of settling spheroidal particles,considering oblate and prolate spheroids and spheres,and investigate the shape effect on the particle dynamics in suspensions wit... In this study,we perform particle-resolved simulations of settling spheroidal particles,considering oblate and prolate spheroids and spheres,and investigate the shape effect on the particle dynamics in suspensions with volume fraction 1%and 5%.We first examine the single-point statistics of the translational and rotational motion of the settling particles.The horizontal velocity has a symmetrical distribution with standard deviation dependent on the particle shape.The greater horizontal velocity fluctuations of the non-spherical particles,compared to that of spheres,are attributed to the horizontal drift of settling spheroids with oblique orientations induced by the fluid-particle and particle-particle interactions.The fluctuation of particle vertical velocity,instead,is skewed under the effect of wake-induced hydrodynamic interactions.Further,we explore the particle pair statistics,which demonstrate the formation of column-like particle micro-structures for the lowest volume fraction considered.This clustering is more pronounced for spheroidal particles than spheres,due to the stronger attractions among vertically-aligned settling spheroids.Moreover,the particle pair statistics are directly related to the collision rate among the dispersed particles.The local accumulation of oblate/prolate spheroids serves as the major mechanism to promote the particle-particle collisions in dilute suspensions. 展开更多
关键词 Particle sedimentation Dynamics Collision rate Immersed boundary method
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Exploring protein conformations by cluster-guided iterative multiple independent molecular dynamics simulations 认领 引用
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作者 Chengtao Ding Guanglin Chen +1 位作者 Qingguo Gong Zhiyong Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期662-670,共9页
Enhanced sampling methods in molecular dynamics(MD)simulations have been gaining popularity in the past decades because they can explore conformations of proteins more efficiently than conventional MD simulations.In t... Enhanced sampling methods in molecular dynamics(MD)simulations have been gaining popularity in the past decades because they can explore conformations of proteins more efficiently than conventional MD simulations.In this paper,we implement a protocol of enhanced sampling that combines iterative multiple independent MD simulations and cluster analysis.After a set of independent simulations,the combined trajectory is divided into clusters.The representative structures picked from the clusters are utilized to start the next cycle of MD simulations.By using different strategies to pick the representative structures,the enhanced sampling can be either targeted or non-targeted.Two multi-domain proteins,Escherichia coli adenylate kinase(AdK)and the three-domain(PHD-Bromo-PWWP)structure in the BS69 protein,were selected to test the method.The data indicate that conformations of the proteins can be efficiently explored,and the results show better agreement with the experimental data than those obtained through conventional MD simulations. 展开更多
关键词 enhanced sampling method molecular dynamics simulation cluster analysis free energy calculation multi-domain protein
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Dynamic response analysis of the liquid-filled cylindrical shell under internal explosion load 认领 引用
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作者 Dian Li Zhenghan Chen +3 位作者 Zhujie Zhao Yongqing Li Hailiang Hou Wenxiao Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第4期357-373,共17页
This study theoretically explored the dynamic response of the liquid-filled cylindrical shell structure experiencing internal explosion shock waves.It analyzed the radial deformation of the liquid-filled cylindrical s... This study theoretically explored the dynamic response of the liquid-filled cylindrical shell structure experiencing internal explosion shock waves.It analyzed the radial deformation of the liquid-filled cylindrical shell structure theoretically.It clarified the protection mechanism of the externally liquid-filled cylindrical shell structure.Based on the improved single-degree-of-freedom system theory,a theoretical model was established via load equivalence and simplification.The radial deformations of unfilled and externally liquid-filled cylindrical shells was investigated under internal explosion shock waves.The influencing factors for structural protection characteristics were explored considering impact load intensity,liquid layer thickness,structural specifications and dimensions,and material properties.The results showed that when the load peak value or the action time was fixed,the maximum radial deformation of the structure increased with the increased load-specific impulse.When the load-specific impulse was fixed,reducing the load peak or extending the loading time decreased the maximum radial deformation of the structure.The protection mechanism of the externally liquid-filled cylindrical shell structure was due to the liquid medium,which acted as an additional mass that con-strained the radial deformation of the structure.The change in liquid layer thickness altered the duration of the liquid's constraint on the radial deformation.The dynamic response of the externally liquid-filled cylindrical shell structure presented three deformation modes,which were determined by the liquid layer thickness,structural specifications,dimensions,and material properties. 展开更多
关键词 SDOF analysis Load equivalence and simplification method Liquid-filled structure Dynamic response Internal explosion load
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A unified analytical model for track deformation mapping and vehicle-track dynamic response induced by substructure deformation 认领 引用
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作者 CHEN Yao FENG Qing-song +2 位作者 ZHAO Lei ZHANG Ling YANG Zhou 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第4期1885-1900,共16页
This study establishes a nonlinear vehicle-track coupled dynamic model that explicitly accounts for the effects of substructure deformation.Based on the vehicle-track coupled dynamics framework,the track structure is ... This study establishes a nonlinear vehicle-track coupled dynamic model that explicitly accounts for the effects of substructure deformation.Based on the vehicle-track coupled dynamics framework,the track structure is modeled using an energy-based approach,in which displacement functions of track layers are expanded into modified Fourier series.The static rail geometry and interlayer contact relations are derived through the principle of stationary potential energy.Considering the dynamic excitation from moving trains,a cross-iterative algorithm is employed to obtain the system responses,thereby enabling unified analysis of static track deformation and dynamic vehicle-track interactions.The results demonstrate that the proposed model effectively reveals the coupling mechanism between substructure deformation parameters,rail surface geometry,and system dynamics.The critical conditions for avoiding void formation under cosine-type and angular-type subgrade settlements follow power-law and linear relations,respectively.For a cosine-type settlement with a wavelength of 15 m and amplitude exceeding 35 mm,vehicle ride quality deteriorates significantly.Moreover,interlayer separation induced by substructure deformation leads to repeated"contact-separation recontact"impacts,which may degrade long-term structural performance.This study provides a unified theoretical and computational framework for quantitatively assessing the effects of substructure deformation on high-speed train safety and track structure durability. 展开更多
关键词 high-speed railway substructure deformation energy method voids between layers mapping relationship dynamic responses
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Quantification of dynamically inhomogeneous acoustoplastic effect on rolling process of superalloy thin-walled complex-section ring 认领 引用
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作者 Guangda SHAO Hongwei LI +1 位作者 Mei ZHAN Zhiyu XIANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第7期609-620,共12页
Superalloy thin-walled complex-section rings,vital for industrial sealing systems,face challenges of localized wall thinning and section springback during deformation.To address these challenges,this work developed an... Superalloy thin-walled complex-section rings,vital for industrial sealing systems,face challenges of localized wall thinning and section springback during deformation.To address these challenges,this work developed an Ultrasonic Vibration-Assisted(UVA)rolling process,where Ultrasonic Vibration(UV)was applied to ring via feed roller.However,circumferential rotation and structural variation of the ring induce dynamically inhomogeneous acoustoplastic effect,thereby complicating process prediction and control.To this problem,a quantification method comprising three key components was proposed:(ⅰ)an acoustoplastic constitutive model related to Acoustic Energy Density(AED)to describe the ring's mechanical re sponse,(ⅱ)a Gaussian function to model the circumferential AED distribution,(ⅲ)a cyclic coupling calculation framework of ultrasonic and deformation fields to capture the axial AED evolution.Using this method,an UVA rolling finite element model of W-section ring was established to reveal the evolution of AED and its influence on deformation.Radial UV concentrates energy in contact zones,exacerbating localized thinning,while axial UV induces uniform AED,suppressing thinning and springback.A spatiotemporal matching strategy of ultrasonic and deformation fields was finally proposed to improve deformation behavior during rolling forming.This work offers a new approach for high-performance manufacturing of thin-walled complex-section rings. 展开更多
关键词 Dynamically inhomogeneous acoustoplastic effect Finite element method Process control Thin-walled complex-section ring Ultrasonic vibration-assisted rolling
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Dynamic tensile strength and fracture evolution of characteristic shale with bedding and hole using linear regression theory 认领 引用
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作者 Yabo Chai Ning Luo +5 位作者 Jianan Zhou Haohao Zhang Penglong Li Yu Wang Cheng Zhai Tianran Ma 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第2期426-445,共20页
In methane in situ explosion fracturing technology,it is critical to investigate the effects of bedding characteristics and perforation holes on the dynamic mechanical properties and fracture behavior of shale reservo... In methane in situ explosion fracturing technology,it is critical to investigate the effects of bedding characteristics and perforation holes on the dynamic mechanical properties and fracture behavior of shale reservoirs.Dynamic Brazilian splitting experiments were conducted to investigate the effects of the bedding angle and the central aperture on the dynamic mechanical properties and fracture behavior of shale disc samples with a central hole using a modified split Hopkinson pressure bar device,a three-dimensional digital image correlation system,and high-speed photography.Multiple regression analysis was used to evaluate the influence on the dynamic tensile strength,while fracture evolution characteristics,including area and morphology,were selected to quantify fracture complexity.The results showed that the bedding angle exerted a more pronounced effect on the tensile strength compared to the central aperture,and increasing impact pressure amplified both effects.Tensile fractures predominated across varying bedding angles,while larger central apertures promoted shear fracture formation.The bedding plane facilitated the expansion of shear fractures in its direction,while the central hole primarily guided fracture propagation along the bedding plane.Fracture initiation occurred at the central hole's edge,with subsequent propagation influenced by both the bedding angle and the central aperture.Higher impact pressures resulted in a significant increase in the fracture area,with 90°bedding and larger apertures(8 and 10 mm)resulting in larger areas.These findings provide essential theoretical guidance for constructing efficient shale reservoir fracture networks in methane in situ explosion fracturing,particularly for applications in deep shale formations. 展开更多
关键词 3D-DIC dynamic tensile strength fracture evolution characteristics m-SHPB multiple regression analysis method
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Hydrodynamics of the self propulsion of a three-dimensional bioinspired travelling wave plate in ground effect 认领 引用
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作者 Zhiqiang Xin Ming Sun Yiming Ren 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期241-256,共16页
In nature,some undulating propulsion organisms with broad pectoral fin utilize ground effect to swim near walls such as the seabed.Inspired by these organisms,the immersed boundary method was adopted to carry out a th... In nature,some undulating propulsion organisms with broad pectoral fin utilize ground effect to swim near walls such as the seabed.Inspired by these organisms,the immersed boundary method was adopted to carry out a three-dimensional numerical simulation of a self-propelled wave plate in ground effect.We had taken into account the three-dimensional flow characteristics of the wavy plate from aspects such as the initial height from the ground,the undulating parameters,and the geometric features of the body.It is found that the undulating rules of travelling wave plate in ground effect need to be controlled in order to obtain better motion performance in ground effect,and the wavy plate can enhance the thrust force rather than the lift force compared with flapping propulsion.The characteristics of the wake vortex structure of the wavy plate change with the undulating amplitude.The optimal fluctuation amplitude enables the plate to achieve a relatively good propulsion speed.Compared with other amplitudes,the swimming efficiency can be increased by 66%at the optimal fluctuation amplitude.Increasing the undulating frequency does not alter the structure of the wake vortices,but it results in a uniform enhancement of the wake vorticity intensity of the plate.When the frequency increases from 1.8 to 2.6,the cruising speed increases by 48%,and the swimming efficiency improves by 30%.For the three-dimensional shape,different shape characteristics also have an impact on it.The plate with larger aspect ratio has a higher speed and a higher swimming efficiency under the same undulating parameters. 展开更多
关键词 Travelling wave plate Self-propelled swimming Ground effect Vorticity dynamics Immersed boundary method
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