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Experimental Study on the Coupling Dynamics of Metal Jet,Waves,and Bubble During Underwater Explosion of a Shaped Charge 认领 引用 被引量：5
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作者 Yu Tian A-Man Zhang +1 位作者 Liu-Yi Xu Fu-Ren Ming 《Engineering》 SCIE EI CSCD 2025年第7期168-187,共20页
Unlike conventional spherical charges,a shaped charge generates not only a strong shock wave and a pulsating bubble,but also a high strain rate metal jet and a ballistic wave during the underwater explosion.They show ... Unlike conventional spherical charges,a shaped charge generates not only a strong shock wave and a pulsating bubble,but also a high strain rate metal jet and a ballistic wave during the underwater explosion.They show significant characteristic differences and couple each other.This paper designs and conducts experiments with shaped charges to analyze the complicated process.The effects of liner angle and weight of shaped charge on the characteristics of metal jets,waves,and bubbles are discussed.It is found that in underwater explosions,the shaped charge generates the metal jet accompanied by the ballistic wave.Then,the shock wave propagates and superimposes with the ballistic wave,and the generated bubble pulsates periodically.It is revealed that the maximum head velocity of the metal jet versus the liner angle a and length-to-diameter ratio k of the shaped charge follows the laws of 1/(α/180°)0.55andλ0.16,respectively.The head shape and velocity of the metal jet determine the curvature and propagation speed of the initial ballistic wave,thus impacting the superposition time and region with the shock wave.Our findings also reveal that the metal jet carries away some explosion products,which hinders the bubble development,causing an inward depression of the bubble wall near the metal jet.Therefore,the maximum bubble radius and pulsation period are 5.2%and 3.9%smaller than the spherical charge with the same weight.In addition,the uneven axial energy distribution of the shaped charge leads to an oblique bubble jet formation. 展开更多
关键词 Shaped charge Underwater explosion Metal jet Waves Bubble Coupling dynamics
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Stability assessment of inverter-dominated power systems considering coupling between phase angle and voltage dynamics 认领 引用
2
作者 Cong Fu Shuiping Zhang +1 位作者 Shun Li Feng Liu 《iEnergy》 EI 2025年第3期157-164,共8页
The integration of renewable energy sources(RESs)with inverter interfaces has fundamentally reshaped power system dynamics,challenging traditional stability analysis frameworks designed for synchronous generator-domin... The integration of renewable energy sources(RESs)with inverter interfaces has fundamentally reshaped power system dynamics,challenging traditional stability analysis frameworks designed for synchronous generator-dominated grids.Conventional classifica-tions,which decouple voltage,frequency,and rotor angle stability,fail to address the emerging strong voltage‒angle coupling effects caused by RES dynamics.This coupling introduces complex oscillation modes and undermines system robustness,neces-sitating novel stability assessment tools.Recent studies focus on eigenvalue distributions and damping redistribution but lack quantitative criteria and interpretative clarity for coupled stability.This work proposes a transient energy-based framework to resolve these gaps.By decomposing transient energy into subsystem-dissipated components and coupling-induced energy exchange,the method establishes stability criteria compatible with a broad variety of inverter-interfaced devices while offering an intuitive energy-based interpretation for engineers.The coupling strength is also quantified by defining the relative coupling strength index,which is directly related to the transient energy interpretation of the coupled stability.Angle‒voltage coupling may induce instability by injecting transient energy into the system,even if the individual phase angle and voltage dynamics themselves are stable.The main contributions include a systematic stability evaluation framework and an energy decomposition approach that bridges theoretical analysis with practical applicability,addressing the urgent need for tools for managing modern power system evolving stability challenges. 展开更多
关键词 Power system stability dynamic coupling inverter-interfaced device stability criteria phase angle dynamics voltage dynamics
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Energy absorption mechanism and design method of anchor cable under dynamic-static coupling condition 认领 引用
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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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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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Entanglement Dynamics of Two Qubits Coupled Independently to Cavities in the Ultrastrong Coupling Regime:Analytical Results 认领 引用 被引量：1
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作者 朱维婷 任清褒 +1 位作者 段立伟 陈庆虎 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第5期5-8,共4页
Dynamics of quantum entanglement of two qubits in two identical quantum Rabi models is studied analytically in the framework of corrections to the rotating-wave approximations. A closed-form expression for the entangl... Dynamics of quantum entanglement of two qubits in two identical quantum Rabi models is studied analytically in the framework of corrections to the rotating-wave approximations. A closed-form expression for the entanglement dynamics initiated from the well-known Bell states is derived, which is very close to the numerical exact results up to the ultrastrong coupling regime. It is found that the vanishing entanglement can be purely induced by the counter-rotating terms, and can be enhanced with the atom-cavity coupling. 展开更多
关键词 RWA on it in Entanglement Dynamics of Two Qubits Coupled Independently to Cavities in the Ultrastrong Coupling Regime:Analytical Results of for been is that Bell
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Parameter optimization for torsion spring of deployable solar array system with multiple clearance joints considering rigid–flexible coupling dynamics 认领 引用 被引量：5
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作者 Yuanyuan LI Meng LI +2 位作者 Yufei LIU Xinyu GENG Chengbo CUI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第3期509-524,共16页
In this paper,four novel evaluation indices and corresponding hierarchical optimization strategies are proposed for a deployable solar array system considering panel flexibility and joint clearance.The deployable sola... In this paper,four novel evaluation indices and corresponding hierarchical optimization strategies are proposed for a deployable solar array system considering panel flexibility and joint clearance.The deployable solar array model consists of a rigid main-body,two panels and four key mechanisms,containing torsion spring mechanism,closed cable loop mechanism,latch mechanism and attitude adjustment mechanism.Rigid and flexible components are established by Nodal Coordinate Formulation and Absolute Nodal Coordinate Formulation,respectively.The clearance joint model is described by nonlinear contact force model and amendatory Coulomb friction model.The latch time,stabilization time,maximum contact force and impulse sum of the contact force of the solar array system are selected as the four novel evaluation indices to represent the complex dynamic responses of a deployable solar array with clearance joints instead of the lock torque widely used in conventional works.To eliminate the gross errors caused by the nonlinear and nonsmooth mechanical properties,a hierarchical optimization strategy based on an adaptive simulated annealing algorithm and a nondominated sorting genetic algorithm is adopted for the solar array system with clearance joints.Results indicate that the effects of panel flexibility on the evaluation index responses and design optimization of the solar array system cannot be neglected.Besides,increasing the weight factor of the stabilization time index of the rigid system may compensate for the differences in optimal results of the rigid–flexible coupling system.That may provide some references for optimization design of deployable space mechanisms considering clearance joints. 展开更多
关键词 Clearance joint Deployable solar array Evaluation index Parameter optimization Rigid-flexible coupling dynamics
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Research on the application of the parameter freezing precise exponential integrator in vehicle-road coupling vibration 认领 引用
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作者 Yu ZHANG Chao ZHANG +1 位作者 Shaohua LI Shaopu YANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第2期373-390,共18页
The vehicle-road coupling dynamics problem is a prominent issue in transportation,drawing significant attention in recent years.These dynamic equations are characterized by high-dimensionality,coupling,and time-varyin... The vehicle-road coupling dynamics problem is a prominent issue in transportation,drawing significant attention in recent years.These dynamic equations are characterized by high-dimensionality,coupling,and time-varying dynamics,making the exact solutions challenging to obtain.As a result,numerical integration methods are typically employed.However,conventional methods often suffer from low computational efficiency.To address this,this paper explores the application of the parameter freezing precise exponential integrator to vehicle-road coupling models.The model accounts for road roughness irregularities,incorporating all terms unrelated to the linear part into the algorithm's inhomogeneous vector.The general construction process of the algorithm is detailed.The validity of numerical results is verified through approximate analytical solutions(AASs),and the advantages of this method over traditional numerical integration methods are demonstrated.Multiple parameter freezing precise exponential integrator schemes are constructed based on the Runge-Kutta framework,with the fourth-order four-stage scheme identified as the optimal one.The study indicates that this method can quickly and accurately capture the dynamic system's vibration response,offering a new,efficient approach for numerical studies of high-dimensional vehicle-road coupling systems. 展开更多
关键词 vehicle-road coupled dynamics dynamic response parameter freezing precise exponential integrator Newmark-βintegration
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Nonlinear Dynamics of Variable-Length Marine Cables with Applications in the Simultaneous Navigation of USV-ROV Systems 认领 引用
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作者 WANG Jian-ming LEI Bo +2 位作者 HUANG Bo-lun YANG Qi LIU Jin-yang 《China Ocean Engineering》 SCIE EI CSCD 2025年第3期410-425,共16页
The integrated systems of unmanned surface vehicles(USVs) and remotely operated vehicles(ROVs) have been extensively applied in marine exploration and seabed coverage. However, the simultaneous navigation of USV-ROV s... The integrated systems of unmanned surface vehicles(USVs) and remotely operated vehicles(ROVs) have been extensively applied in marine exploration and seabed coverage. However, the simultaneous navigation of USV-ROV systems is frequently limited by strong disturbances induced by waves or currents. This paper develops a novel rigidflexible coupling multibody dynamic model that incorporates disturbances of variable-length marine cables with geometrically nonlinear motion. A hybrid Lagrangian-Eulerian absolute nodal coordinate formulation(ANCF) element is developed to accurately model subsea cables which undergo significant overall motion, substantial deformation,and mass flow during the deployment of underwater equipment. Furthermore, the governing equations of the coupled USV-umbilical-ROV system are derived, considering wave-induced forces and current disturbances. A numerical solver based on the Newmark-beta method is proposed, along with an adaptive meshing technique near the release point. After validating three experimental cases, the cable disturbances at both the USV and ROV ends—caused by ocean currents, heave motion, and simultaneous navigation—are comprehensively compared and evaluated. Finally,it is demonstrated that a PD controller with disturbance compensation can enhance the simultaneous navigation performance of USV-ROV systems. 展开更多
关键词 variable-length marine cable ANCF rigid-flexible coupling multibody dynamics PD controller with disturbance compensation USV-ROV system
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Cumulative thermal coupling modeling and analysisof oil-immersed motor-pump assembly forelectro–hydrostatic actuator 认领 引用 被引量：4
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作者 Siming FAN Shaoping WANG +3 位作者 Qiyang WANG Xingjian WANG Di LIU Xiao WU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第5期394-410,共17页
The Electro–Hydrostatic Actuator(EHA)is applied to drive the control surface in flightcontrol system of more electric aircraft.In EHA,the Oil-Immersed Motor Pump(OMP)serves asthe core as a power assembly.However,the ... The Electro–Hydrostatic Actuator(EHA)is applied to drive the control surface in flightcontrol system of more electric aircraft.In EHA,the Oil-Immersed Motor Pump(OMP)serves asthe core as a power assembly.However,the compact integration of the OMP presents challenges inefficiently dissipating internal heat,leading to a performance degradation of the EHA due to ele-vated temperatures.Therefore,accurately modeling and predicting the internal thermal dynamicsof the OMP hold considerable significance for monitoring the operational condition of the EHA.In view of this,a modeling method considering cumulative thermal coupling was hereby proposed.Based on the proposed method,the thermal models of the motor and the pump were established,taking into account heat accumulation and transfer.Taking the leakage oil as the heat couplingpoint between the motor and the pump,the dynamic thermal coupling model of the OMP wasdeveloped,with the thermal characteristics of the oil considered.Additionally,the comparativeexperiments were conducted to illustrate the efficiency of the proposed model.The experimentalresults demonstrate that the proposed dynamic thermal coupling model accurately captured thethermal behavior of OMP,outperforming the static thermal parameter model.Overall,thisadvancement is crucial for effectively monitoring the health of EHA and ensuring flight safety. 展开更多
关键词 Electro-hydrostatic actuator Oil-immersed motor-pump Dynamic thermal coupling model Heat transfer Heat accumulation
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Dynamic characteristics analysis of rack railway track system under traction conditions by experimental test 认领 引用 被引量：1
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作者 Zhihui Chen Guojun Yang +3 位作者 Zaigang Chen Haitao Zhang Jizhong Yang Wanming Zhai 《Railway Engineering Science》 EI 2026年第1期40-54,共15页
The dynamic characteristics of the track system can directly affect its service performance and failure process.To explore the load characteristics and dynamic response of the track system under the dynamic loads from... The dynamic characteristics of the track system can directly affect its service performance and failure process.To explore the load characteristics and dynamic response of the track system under the dynamic loads from the rack vehicle in traction conditions,a systematic test of the track subsystem was carried out on a large-slope test line.In the test,the bending stress of the rack teeth,the wheel-rail forces,and the acceleration of crucial components in the track system were measured.Subsequently,a detailed analysis was conducted on the tested signals of the rack railway track system in the time domain and the time-frequency domains.The test results indicate that the traction force significantly affects the rack tooth bending stress and the wheel-rail forces.The vibrations of the track system under the traction conditions are mainly caused by the impacts generated from the gear-rack engagement,which are then transferred to the sleepers,the rails,and the ballast beds.Furthermore,both the maximum stress on the racks and the wheel-rail forces measured on the rails remain below their allowable values.This experimental study evaluates the load characteristics and reveals the vibration characteristics of the rack railway track system under the vehicle’s ultimate load,which is very important for the load-strengthening design of the key components such as racks and the vibration and noise reduction of the track system. 展开更多
关键词 Rack railway Vehicle-track coupled dynamics Traction condition Experimental test Gear-rack engagement
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A full information expression model for track irregularity based on stochastic harmonic functions in vehicle-turnout structure stochastic vibration analysis 认领 引用 被引量：1
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作者 Xueyang Tang Xiaopei Cai +1 位作者 Jingmang Xu Fei Yang 《Railway Engineering Science》 EI 2026年第2期349-369,共21页
Turnout irregularity significantly affects the stochastic vibration behavior of vehicle-turnout structures.This study proposes a fitting formula for the turnout irregularity spectrum and develops a turnout irregularit... Turnout irregularity significantly affects the stochastic vibration behavior of vehicle-turnout structures.This study proposes a fitting formula for the turnout irregularity spectrum and develops a turnout irregularity full information expression model(TIFIEM)using a stochastic harmonic function.The model is applied to vehicle-turnout structure stochastic vibration and reliability analysis.Findings suggest that the Hamming window method,with a window length of 4096 points,is optimal for estimating the turnout irregularity spectrum.It is recommended to fit the power spectral density(PSD)using a 5th-order polynomial for better accuracy.The TIFIEM effectively addresses randomness in amplitude,frequency,and phase.An analysis of 250 irregularity samples is sufficient for the desired accuracy.Additionally,the PSD amplitude at various frequency points follows a Chi-square distribution with 2°of freedom.Regions 3-7 m from the tip of the switch rail on the straight switch rail and 53-54 m on the point rail are most susceptible to wear.When the vehicle passes through the turnout at 300 km/h,the reliability of vehicle-turnout structures at the crossing panel decreases to 95.8%. 展开更多
关键词 High-speed railway Vehicle-turnout coupling dynamics Turnout irregularity spectrum Stochastic harmonic function Probability density evolution method
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Research Progress on Particle Behavior and Dynamics in Optical Tweezers 认领 引用
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作者 Jiali Pan 《Journal of Electronic Research and Application》 2025年第2期125-132,共8页
Optical tweezers technology utilizes the optical potential well generated by a focused laser beam to achieve precise manipulation of micro and nanoparticles.Based on the optical tweezers platform,the motion behavior a... Optical tweezers technology utilizes the optical potential well generated by a focused laser beam to achieve precise manipulation of micro and nanoparticles.Based on the optical tweezers platform,the motion behavior and dynamic laws of particles are deeply studied,which can reveal the transport mechanism of complex systems.Based on summarizing the principles and experimental methods of optical tweezers technology,this article systematically summarizes the typical force characteristics of particles in optical tweezers,focusing on the dynamic research progress of single particle non-equilibrium state,double particle coupling,and multi-particle cluster system,laying a theoretical foundation for expanding the application of optical tweezers technology in physics,chemistry,biology,and other fields. 展开更多
关键词 Optical tweezers Particle manipulation Brownian motion Non-equilibrium state Coupling dynamics
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Hydrological connectivity in eco-hydrology:A foundational paradigm,significance,and perspectives 认领 引用
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作者 Xiang-hu Li Li-gang Xu 《Water Science and Engineering》 EI CAS CSCD 2026年第2期157-160,共4页
1.Introduction Hydrological connectivity,a key indicator characterizing the capacity of water,sediments,organisms,and nutrients to move within ecosystems,has become a central paradigm and fundamental theoretical found... 1.Introduction Hydrological connectivity,a key indicator characterizing the capacity of water,sediments,organisms,and nutrients to move within ecosystems,has become a central paradigm and fundamental theoretical foundation in contemporary eco-hydrology(Grill et al.,2019).Eco-hydrology aims to elucidate the dynamic coupling mechanisms between hydrological processes and ecological patterns and functions,with hydrological connectivity serving as a critical link in understanding this complex feedback relationship. 展开更多
关键词 fundamental theoretical foundation hydrological processes dynamic coupling mechanisms elucidate dynamic coupling mechanisms eco hydrology hydrological connectivity hydrological connectivitya ecological patterns
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Plasma induced dynamic coupling of microscopic factors to collaboratively promote EM losses coupling of transition metal dichalcogenide absorbers 认领 引用 被引量：8
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作者 Jiaming Wen Geng Chen +7 位作者 Shengchong Hui Zijing Li Jijun Yun Xiaomeng Fan Limin Zhang Qian He Xingmin Liu Hongjing Wu 《Advanced Powder Materials》 2024年第3期1-11,共11页
Plasma as the fourth state of matter has attracted great attention for material surface modification,which could induce changes in material microscopic factors,such as defects,phase transitions,crystallinity,and so on... Plasma as the fourth state of matter has attracted great attention for material surface modification,which could induce changes in material microscopic factors,such as defects,phase transitions,crystallinity,and so on.However,the interactions among those microscopic factors and regulation mechanism of macroscopic properties have rarely been investigated.Two-dimensional(2D)transition metal dichalcogenide with tunable structure and phase is one of the most promising electromagnetic wave(EMW)absorbers,which provides a favorable platform for systematically studying the dynamic coupling of its microscopic factors.Herein,we constructed a NaBH4 solution-assisted Ar plasma method to modify the 2H-MoS2and 1T-WS2for exploring the regulation mechanism of microscopic factors.For MoS2and WS2,NaBH4 solution-assisted Ar plasma treatment behaves with different effects on dielectric responses,realizing dynamic coupling of material microscopic factors to collaboratively promote EM losses coupling.Consequently,the MS-D3-0.5(MoS2,3 kV voltage,0.5 mol L-1NaBH4 solution)displays an optimum effective absorption bandwidth of 8.01 GHz,which is 319.4%more than that of MS-raw sample.This study not only reveals the novel mechanism of plasma induced dynamic coupling of microscopic factors for EMW dissipation,but also presents a new method of plasma-dominated surface modification to optimize the EMW absorption performance. 展开更多
关键词 TMDs Ar plasma Defect Metal single atom Dynamic coupling
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Improved Dynamics Model of Locomotive Traction Motor with Elasticity of Rotor Shaft and Supporting Bearings 认领 引用 被引量：6
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作者 Yuqing Liu Zaigang Chen +2 位作者 Jieyu Ning Kaiyun Wang Wanming Zhai 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2022年第5期333-350,共18页
The locomotive traction motor is described as a rotor-bearing system coupling the kinetic equations of the traction shaft and its support bearings with the determination of their elastic deformations in this study.Und... The locomotive traction motor is described as a rotor-bearing system coupling the kinetic equations of the traction shaft and its support bearings with the determination of their elastic deformations in this study.Under the effect of excitations induced by the dynamic rotor eccentric distance and time-varying mesh stiffness,the elastic structure deformations of the shaft and support bearings are formulated in the vibration environment of the locomotive.In addition,the nonlinear contact forces between the components of the rolling bearing,the lubricating oil film,and radial clearance are comprehensively considered in this study.The results indicate that the elastic deformations of the shaft and bearings can change the dynamic responses of the traction motor and its support bearings.There are large differences between the ranges of the rotor motion calculated by the rigid and the flexible traction motor models when the intensified wheel-rail interaction is considered.With the increase of the rotor eccentricity,the results underscore the role of the elasticity of traction shaft and support bearings in dynamic researches of the traction motor.The critical value of the initial eccentric distance for the rub-impact phenomenon decreases from 1.23 mm to 1.15 mm considering the flexible effect of the shaft and bearings.This dynamics model of the traction motor can provide more accurate and reasonable simulation results for correlational dynamic researches. 展开更多
关键词 Traction motor Bearing Gear mesh Vehicle-track coupled dynamics
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Characteristic analysis of mechanical thermal coupling model for bearing rotor system of high-speed train 认领 引用 被引量：6
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作者 Yongqiang LIU Baosen WANG +2 位作者 Shaopu YANG Yingying LIAO Tao GUO 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2022年第9期1381-1398,共18页
Based on Newton’s second law and the thermal network method,a mechanical thermal coupling model of the bearing rotor system of high-speed trains is established to study the interaction between the bearing vibration a... Based on Newton’s second law and the thermal network method,a mechanical thermal coupling model of the bearing rotor system of high-speed trains is established to study the interaction between the bearing vibration and temperature.The influence of lubrication on the vibration and temperature characteristics of the system is considered in the model,and the real-time relationship between them is built up by using the transient temperature field model.After considering the lubrication,the bearing outer ring vibration acceleration and node temperature considering grease are lower,which shows the necessity of adding the lubrication model.The corresponding experiments for characteristics of vibration and temperature of the model are respectively conducted.In the envelope spectrum obtained from the simulation signal and the experimental signal,the frequency values corresponding to the peaks are close to the theoretical calculation results,and the error is very small.In the three stages of the temperature characteristic experiment,the node temperature change of the simulation model is consistent with the experiment.The good agreement between simulation and experiments proves the effectiveness of the model.By studying the influence of the bearing angular and fault size on the system node temperature,as well as the change law of bearing lubrication characteristics and temperature,it is found that the worse the working condition is,the higher the temperature is.When the ambient temperature is low,the viscosity of grease increases,and the oil film becomes thicker,which increases the sliding probability of the rolling element,thus affecting the normal operation of the bearing,which explains the phenomenon of frequent bearing faults of high-speed trains in the low-temperature area of Northeast China.Further analysis shows that faults often occur in the early stage of train operation in the low-temperature environment. 展开更多
关键词 high-speed train coupling dynamic model thermal network method track irregularity(TI) low temperature
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Vibration control of pedestrian-bridge vertical dynamic coupling interaction based on biodynamic model 认领 引用 被引量：3
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作者 朱前坤 李宏男 +1 位作者 南娜娜 杜永峰 《Journal of Southeast University(English Edition)》 EI CAS 2017年第2期209-215,共7页
The human-induced vertical vibration serviceability of low-frequency and lightweight footbridges is studied based on the moving mass-spring-damper（MMSD） biodynamic model, and the mass damper（TMD） with different op... The human-induced vertical vibration serviceability of low-frequency and lightweight footbridges is studied based on the moving mass-spring-damper（MMSD） biodynamic model, and the mass damper（TMD） with different optimal model parameters being used to control the vertical vibration.First, the MMSD biodynamic model is employed to simulate the pedestrians, and the time-varying control equations of the vertical dynamic coupling system of the pedestrian-bridgeTMD are established with the consideration of pedestrianbridge dynamic interaction; and the equations are solved by using the Runge-Kutta-Felhberg integral method with variable step size. Secondly, the footbridge dynamic response is calculated under the model of pedestrian-structure dynamic interaction and the model of moving load when the pedestrian pace frequency is consistent with the natural frequency of footbridge. Finally, a comparative study and analysis are made on the control effects of the vertical dynamic coupling system in different optimal models of the TMD. The calculation results show that the pedestrian-bridge dynamic interaction cannot be ignored when the vertical human-induced vibration serviceability of low-frequency and light-weight footbridge is evaluated. The TMD can effectively reduce the vibration under the resonance of pedestrian-bridge, and TMD parameters are recommended for the determination by the Warburton optimization model. 展开更多
关键词 footbridge vibration serviceability biodynamic dynamic coupling system vibration control
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Continuum and Discrete Element Coupling Approach to Analyzing Seismic Responses of a Slope Covered by Deposits 认领 引用 被引量：7
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作者 ZHANG Hua LU Yang 《Journal of Mountain Science》 SCIE 2010年第3期264-275,共12页
Numerical analyses of earthquake effects on the deformation,stability,and load transfer of a slope covered by deposits are traditionally based on the assumption that the slope is a continuum.It would be problematic,ho... Numerical analyses of earthquake effects on the deformation,stability,and load transfer of a slope covered by deposits are traditionally based on the assumption that the slope is a continuum.It would be problematic,however,to extend these approaches to the simulation of the slide,collapse and disintegration of the deposits under seismic loading.Contrary to this,a discrete element method(DEM)provides a means to consider large displacement and rotation of the non-continuum.To take the advantages of both methods of continuum and non-continuum analyses,seismic responses of a slope covered by deposits are studied by coupling a twodimensional(a-D)finite difference method and a 2-D DEM,with the bedrock being modelled by the finite difference grids and the deposits being represented by disks.A smooth transition across the boundaries of the continuous/discontinuous domains is obtained by imposing the compatibility condition and equilibrium condition along their interfaces.In the course of computation,the same time-step value is chosen for both continuous and discontinuous domains.The free-field boundaries are adopted for lateral grids of bedrock domain to eliminate the radiation damping effect.When the static equilibrium under gravity load is obtained,dynamic calculation begins under excitation of the seismic wave input from the continuum model bottom.In this way,responses to the earthquake of a slope covered by deposits are analyzed dynamically.Combined with field monitoring data,deformation and stability of the slope are discussed.The effects of the relevant parameters of spectrum characteristic,duration,andpeak acceleration of seismic waves are further investigated and explained from the simulations. 展开更多
关键词 Slope deposit continuum discreteelement method dynamic coupling rock/soilinterface
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Symplectic Analysis on Coupling Behaviors of Spatial Fiexible Damping Beam 认领 引用 被引量：3
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作者 Weipeng Hu Xiaojian Xi +3 位作者 Zhe Zhai Pengfei Cui Fan Zhang Zichen Deng 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2022年第4期541-551,共11页
Although the complex structure-preserving method presented in our previous studies can be used to investigate the orbit–attitude–vibration coupled dynamic behaviors of the spatial flexible damping beam,the simulatio... Although the complex structure-preserving method presented in our previous studies can be used to investigate the orbit–attitude–vibration coupled dynamic behaviors of the spatial flexible damping beam,the simulation speed still needs to be improved.In this paper,the infinite-dimensional dynamic model describing the orbit–attitude–vibration coupled dynamic problem of the spatial flexible damping beam is pretreated by the method of separation of variables,and the second-level fourth-order symplectic Runge–Kutta scheme is constructed to investigate the coupling dynamic behaviors of the spatial flexible damping beam quickly.Compared with the simulation speed of the complex structure-preserving method,the simulation speed of the symplectic Runge–Kutta method is faster,which benefits from the pretreatment step.The effect of the initial radial velocity on the transverse vibration as well as on the attitude evolution of the spatial flexible damping beam is presented in the numerical examples.From the numerical results about the effect of the initial radial velocity,it can be found that the appearance of the initial radial velocity can decrease the vibration frequency of the spatial beam and shorten the evolution interval for the attitude angle to tend towards a stable value significantly.In addition,the validity of the numerical results reported in this paper is verified by comparing with some numerical results presented in our previous studies. 展开更多
关键词 Symplectic Runge-Kutta method Spatial fexible damping beam Orbit-attitudevibration coupled dynamic behavior Structure-preserving
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A Coupling Dynamic Model for Dissolution and Reduction of Chromium Ore in a Smelting Reduction Converter 认领 引用 被引量：3
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作者 LIU Yan JIANG Mao-fa +1 位作者 XU Li-xian WANG De-yong 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2012年第1期5-10,共6页
For describing and resolving the process of chromium ore smelting reduction in a converter preferably, the coupling dynamic model was established based on the kinetic models of chromium ore dissolution and interfacial... For describing and resolving the process of chromium ore smelting reduction in a converter preferably, the coupling dynamic model was established based on the kinetic models of chromium ore dissolution and interfacial re- ducing reaction between the slag and metal. When 150 t stainless steel crude melts with chromium of 12% are produced in a smelting reduction converter with no initial chromium in metal at 1 560℃, the results of the coupling dynamic model show that the mean reduction rate and injection rate of chromium ore are 0. 091% ·min^-1 and 467 kg · min^-1 , respectively. The foundation of the coupling dynamic model provides a reference and basis on the constitution of rational processing route for a practical stainless steelmaking. 展开更多
关键词 coupling dynamic model smelting reduction stainless steel crude melt converter
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