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Element differential method for the multi-physics coupled contact analysis of high-temperature dynamic seal structure 认领 引用
1
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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Innovation and Practice of College Physics Teaching from the Perspective of Multi-Physics Coupling 认领 引用
2
作者 Wenting Lu 《Journal of Contemporary Educational Research》 2026年第5期278-283,共6页
Traditional college physics teaching mostly deals with single physical fields,which is convenient for basic knowledge instruction but tends to fragment the inherent connections among physical phenomena,making it incon... Traditional college physics teaching mostly deals with single physical fields,which is convenient for basic knowledge instruction but tends to fragment the inherent connections among physical phenomena,making it inconsistent with the real physical picture of complex systems in modern engineering practice.Multi-physics coupling studied in this paper focuses on the mutual influence and synergistic interaction of multiple physical fields-including thermal,stress,electromagnetic,and fluid fields-in space and time,representing a frontier and focus of current and future scientific research and engineering design.From the perspective of multi-physics coupling,this paper combines the current situation of college physics teaching and proposes innovative teaching strategies.It aims to effectively break disciplinary barriers,cultivate students’systematic physical thinking,and genuinely integrate the concept of multi-physics coupling into all links of college physics teaching through comprehensive reform and practice.These efforts will greatly enhance students’ability to analyze and solve complex practical problems,and ultimately cultivate more engineering and technological talents with interdisciplinary literacy and innovative competence. 展开更多
关键词 Multi-physics coupling College physics Teaching innovation
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Multi-physics modeling of laser melted magnesium alloy:Bridging melt pool dynamics to microstructure evolution 认领 引用
3
作者 Junying Liu Xuehua Wu +7 位作者 Dongsheng Wang Chunrong Pan Renkai Huang Fang Deng Cijun Shuai Joseph Buhagiar Jing Bai Youwen Yang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第12期6167-6182,共16页
Laser powder bed fusion(LPBF)has revolutionized modern manufacturing by enabling high design freedom,rapid prototyping,and tailored mechanical properties.However,optimizing process parameters remains challenging due t... Laser powder bed fusion(LPBF)has revolutionized modern manufacturing by enabling high design freedom,rapid prototyping,and tailored mechanical properties.However,optimizing process parameters remains challenging due to the trial-and-error approaches required to capture subtle parameter-microstructure relationships.This study employed a multi-physics computational framework to investigate the melting and solidification dynamics of magnesium alloy.By integrating the discrete element method for powder bed generation,finite volume method with volume of fluid for melt pool behavior,and phase-field method for microstructural evolution,the critical physical phenomena,including powder melting,molten pool flow,and directional solidification were simulated.The effects of laser power and scanning speed on temperature distribution,melt pool geometry,and dendritic morphology were systematically analyzed.It was revealed that increasing laser power expanded melt pool dimensions and promoted columnar dendritic growth,while high scanning speeds reduced melt pool stability and refined dendritic structures.Furthermore,Marangoni convection and thermal gradients governed solute redistribution,with excessive energy input risking defects such as porosity and elemental evaporation.These insights establish quantitative correlations between process parameters,thermal history,and microstructural characteristics,providing a validated roadmap for LPBF-processed magnesium alloy with tailored performance. 展开更多
关键词 Laser powder bed fusion Magnesium alloy Multi-physics modeling Microstructure evolution Process optimization
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Nonlinear traveling wave vibration of rotating ferromagnetic functionally graded cylindrical shells under multi-physics fields 认领 引用
4
作者 Feng LIAO Yuda HU +1 位作者 Tao YANG Xiaoman LIU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第10期1921-1938,I0025-I0036,共18页
The nonlinear traveling wave vibration of rotating ferromagnetic functionally graded(FG)cylindrical shells under multi-physics fields is investigated.Grounded in the Kirchhoff-Love thin shell theory,the geometric nonl... The nonlinear traveling wave vibration of rotating ferromagnetic functionally graded(FG)cylindrical shells under multi-physics fields is investigated.Grounded in the Kirchhoff-Love thin shell theory,the geometric nonlinearity is incorporated into the model,and the constitutive equations are derived.The physical parameters of functionally graded materials(FGMs),which exhibit continuous variation across the thickness gradient,are of particular interest.The nonlinear magneto-thermoelastic governing equations are derived in accord with Hamilton's principle.The nonlinear partial differential equations are discretized with the Galerkin method,and the analytical expression of traveling wave frequencies is derived with an approximate method.The accuracy of the proposed method is validated through the comparison with the results from the literature and numerical solutions.Finally,the visualization analyses are conducted to examine the effects of key parameters on the traveling wave frequencies.The results show that the factors including the power-law index,temperature,magnetic field intensity,and rotating speed have the coupling effects with respect to the nonlinear vibration behavior. 展开更多
关键词 ferromagnetic functionally graded(FG)cylindrical shell nonlinear traveling wave vibration multi-physics field approximate analytical method
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Scalable and Passive Concentrator Photovoltaics Using a Multi-Focal Pyramidal Array:A Multi-Physics Modeling Approach 认领 引用
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作者 Mussad Mohammed Al-Zahrani Taher Maatallah 《Frontiers in Heat and Mass Transfer》 EI CAS 2025年第6期1883-1905,共23页
Conventional concentrator photovoltaics(CPV)face a persistent trade-off between high efficiency and high cost,driven by expensive multi-junction solar cells and complex active cooling systems.This study presents a com... Conventional concentrator photovoltaics(CPV)face a persistent trade-off between high efficiency and high cost,driven by expensive multi-junction solar cells and complex active cooling systems.This study presents a computational investigation of a novel Multi-Focal Pyramidal Array(MFPA)-based CPV system designed to overcome this limitation.The MFPA architecture employs a geometrically optimized pyramidal concentrator to distribute concen-trated sunlight onto strategically placed,low-cost monocrystalline silicon cells,enabling high efficiency energy capture while passively managing thermal loads.Coupled optical thermal electrical simulations in COMSOL Multiphysics demonstrate a geometric concentration ratio of 120×,with system temperatures maintained below 110℃ under standard 1000 W/m2 Direct Normal Irradiance(DNI).Ray tracing confirms 95%optical efficiency and a concentrated light spot radius of 2.48 mm.Compared with conventional CPV designs,the MFPA improves power-per-cost by 25%and reduces tracking requirements by 50%owing to its wide±15°acceptance angle.These results highlight the MFPA’s potential as a scalable,low-cost,and energy-efficient pathway for expanding solar power generation. 展开更多
关键词 Concentrating photovoltaic(CPV) multi-focal pyramidal array(MFPA) multi-physics simulation optical-thermal coupling geometric concentration solar energy conversion
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Verification of a self-developed CFD-based multi-physics coupled code MPC-LBE for LBE-cooled reactor 认领 引用 被引量：14
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作者 Zhi-Xing Gu Qing-Xian Zhang +4 位作者 Yi Gu Liang-Quan Ge Guo-Qiang Zeng Mu-Hao Zhang Bao-Jie Nie 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2021年第5期84-100,共17页
To perform an integral simulation of a pool-type reactor using CFD code,a multi-physics coupled code MPC-LBE for an LBE-cooled reactor was proposed by integrating a point kinetics model and a fuel pin heat transfer mo... To perform an integral simulation of a pool-type reactor using CFD code,a multi-physics coupled code MPC-LBE for an LBE-cooled reactor was proposed by integrating a point kinetics model and a fuel pin heat transfer model into self-developed CFD code.For code verification,a code-to-code comparison was employed to validate the CFD code.Furthermore,a typical BT transient benchmark on the LBE-cooled XADS reactor was selected for verification in terms of the integral or system performance.Based on the verification results,it was demonstrated that the MPC-LBE coupled code can perform thermal-hydraulics or safety analyses for analysis for processes involved in LBE-cooled pool-type reactors. 展开更多
关键词 LBE-cooled pool-type reactor Computational fluid dynamics Multi-physics coupling code Safety analysis code Verification
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Development and application of a multi-physics and multi-scale coupling program for lead-cooled fast reactor 认领 引用 被引量：11
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作者 Xiao Luo Chi Wang +4 位作者 Ze-Ren Zou Lian-Kai Cao Shuai Wang Zhao Chen Hong-Li Chen 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第2期40-52,共13页
In this study,a multi-physics and multi-scale coupling program,Fluent/KMC-sub/NDK,was developed based on the user-defined functions(UDF)of Fluent,in which the KMC-sub-code is a sub-channel thermal-hydraulic code and t... In this study,a multi-physics and multi-scale coupling program,Fluent/KMC-sub/NDK,was developed based on the user-defined functions(UDF)of Fluent,in which the KMC-sub-code is a sub-channel thermal-hydraulic code and the NDK code is a neutron diffusion code.The coupling program framework adopts the"master-slave"mode,in which Fluent is the master program while NDK and KMC-sub are coupled internally and compiled into the dynamic link library(DLL)as slave codes.The domain decomposition method was adopted,in which the reactor core was simulated by NDK and KMC-sub,while the rest of the primary loop was simulated using Fluent.A simulation of the reactor shutdown process of M2LFR-1000 was carried out using the coupling program,and the code-to-code verification was performed with ATHLET,demonstrating a good agreement,with absolute deviation was smaller than 0.2%.The results show an obvious thermal stratification phenomenon during the shutdown process,which occurs 10 s after shutdown,and the change in thermal stratification phenomena is also captured by the coupling program.At the same time,the change in the neutron flux density distribution of the reactor was also obtained. 展开更多
关键词 Multi-physics and multi-scale coupling method User-defined functions Dynamic link library Thermal stratification Lead-cooled fast reactor
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Multi-physics multi-scale simulation of unique equiaxed-to-columnar-to-equiaxed transition during the whole solidification process of Al-Li alloy laser welding 认领 引用 被引量：2
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作者 Chu Han Ping Jiang +1 位作者 Shaoning Geng Liangyuan Ren 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第4期235-251,共17页
In this study,a novel multi-physics multi-scale model with the dilute multicomponent phase-field method in three-dimensional(3D)space was developed to investigate the complex microstructure evolu-tion in the molten po... In this study,a novel multi-physics multi-scale model with the dilute multicomponent phase-field method in three-dimensional(3D)space was developed to investigate the complex microstructure evolu-tion in the molten pool during laser welding of Al-Li alloy.To accurately compute mass data within both two and three-dimensional computational domains,three efficient computing methods,including central processing unit parallel computing,adaptive mesh refinement,and moving-frame algorithm,were uti-lized.Emphasis was placed on the distinctive equiaxed-to-columnar-to-equiaxed transition phenomenon that occurs during the entire solidification process of Al-Li alloy laser welding.Simulation results indi-cated that the growth distance of columnar grains that epitaxially grew from the base metal(BM)de-creased as the nucleation rate increased.As the nucleation rate increased,the morphology of the newly formed grains near the fusion boundary(FB)changed from columnar to equiaxed,and newly formed equiaxed grains changed from having high-order dendrites to no obvious dendrite structure.When the nucleation rate was sufficiently high,non-dendritic equiaxed grains could directly form near the FB,and there was nearly no epitaxial growth from the BM.Additionally,simulation results illustrated the com-petition among multiple grains with varying orientations that grow in 3D space near the FB.Finally,how equiaxed grain bands develop was elucidated.The equiaxed band not only hindered the growth of early columnar grains but also some of its grains could grow epitaxially to form new columnar grains.These predicted results were in good agreement with experimental measurements and observations. 展开更多
关键词 Laser welding Al-Li alloy Equiaxed-to-columnar-to-equiaxed transition Multi-physics multi-scale model Multicomponent alloys 3D phase-field model
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Multi-physics coupling field finite element analysis on giant magnetostrictive materials smart component 认领 引用 被引量：2
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作者 Zhang-rong ZHAO Yiojie WU +2 位作者 Xin-jian GU Lei ZHANG Ji-feng YANG 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2009年第5期653-660,共8页
This study presents a new method to solve the difficult problem of precise machining a non-cylinder pinhole of a piston using embedded giant magnetostrictive material (GMM) in the component. We propose the finite elem... This study presents a new method to solve the difficult problem of precise machining a non-cylinder pinhole of a piston using embedded giant magnetostrictive material (GMM) in the component. We propose the finite element model of GMM smart component in electric, magnetic, and mechanical fields by step computation to optimize the design of GMM smart com-ponent. The proposed model is implemented by using COMSOL multi-physics V3.2a. The effects of the smart component on the deformation and the system resonance frequencies are studied. The results calculated by the model are in excellent agreement (relative errors are below 10%) with the experimental values. 展开更多
关键词 Smart component Giant magnetostrictive Finite element method （FEM） modeling Non-cylinder piston pinhole Multi-physics coupling field
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Multi-physics analysis of permanent magnet tubular linear motors under severe volumetric and thermal constraints 认领 引用 被引量：2
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作者 李方 叶佩青 张辉 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第7期1690-1699,共10页
Permanent magnet tubular linear motors(TLMs) arranged in multiple rows and multiple columns used for a radiotherapy machine were studied. Due to severe volumetric and thermal constraints, the TLMs were at high risk of... Permanent magnet tubular linear motors(TLMs) arranged in multiple rows and multiple columns used for a radiotherapy machine were studied. Due to severe volumetric and thermal constraints, the TLMs were at high risk of overheating. To predict the performance of the TLMs accurately, a multi-physics analysis approach was proposed. Specifically, it considered the coupling effects amongst the electromagnetic and the thermal models of the TLMs, as well as the fluid model of the surrounding air. To reduce computation cost, both the electromagnetic and the thermal models were based on lumped-parameter methods. Only a minimum set of numerical computation(computational fluid dynamics, CFD) was performed to model the complex fluid behavior. With the proposed approach, both steady state and transient state temperature distributions, thermal rating and permissible load can be predicted. The validity of this approach is verified through the experiment. 展开更多
关键词 tubular linear motor multi-physics coupling lumped-parameter temperature prediction
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Multi-Physics Coupled Acoustic-Mechanics Analysis and Synergetic Optimization for a Twin-Fluid Atomization Nozzle 认领 引用
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作者 Wenying Li Yanying Li +4 位作者 Yingjie Lu Jinhuan Xu Bo Chen Li Zhang Yanbiao Li 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2024年第3期204-223,共20页
Fine particulate matter produced during the rapid industrialization over the past decades can cause significant harm to human health.Twin-fluid atomization technology is an effective means of controlling fine particul... Fine particulate matter produced during the rapid industrialization over the past decades can cause significant harm to human health.Twin-fluid atomization technology is an effective means of controlling fine particulate matter pollution.In this paper,the influences of the main parameters on the droplet size,effective atomization range and sound pressure level(SPL)of a twin-fluid nozzle(TFN)are investigated,and in order to improve the atomization performance,a multi-objective synergetic optimization algorithm is presented.A multi-physics coupled acousticmechanics model based on the discrete phase model(DPM),large eddy simulation(LES)model,and Ffowcs Williams-Hawkings(FW-H)model is established,and the numerical simulation results of the multi-physics coupled acoustic-mechanics method are verified via experimental comparison.Based on the analysis of the multi-physics coupled acoustic-mechanics numerical simulation results,the effects of the water flow on the characteristics of the atomization flow distribution were obtained.A multi-physics coupled acoustic-mechanics numerical simulation result was employed to establish an orthogonal test database,and a multi-objective synergetic optimization algorithm was adopted to optimize the key parameters of the TFN.The optimal parameters are as follows:A gas flow of 0.94 m3/h,water flow of 0.0237 m3/h,orifice diameter of the self-excited vibrating cavity(SVC)of 1.19 mm,SVC orifice depth of 0.53 mm,distance between SVC and the outlet of nozzle of 5.11 mm,and a nozzle outlet diameter of 3.15 mm.The droplet particle size in the atomization flow field was significantly reduced,the spray distance improved by 71.56%,and the SPL data at each corresponding measurement point decreased by an average of 38.96%.The conclusions of this study offer a references for future TFN research. 展开更多
关键词 Twin-fluid nozzle BP neural network Multi-objective optimization Multi-physics coupled Acousticmechanics analysis Genetic algorithm
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Minimal Realization of Linear Graph Models for Multi-physics Systems 认领 引用
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作者 Clarence W.DE SILVA 《Instrumentation》 EI 2019年第4期72-84,共13页
An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is termed a multi-domain(or multi-physics)system.Th... An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is termed a multi-domain(or multi-physics)system.The present paper concerns the use of linear graphs(LGs)to generate a minimal model for a multi-physics system.A state-space model has to be a minimal realization.Specifically,the number of state variables in the model should be the minimum number that can completely represent the dynamic state of the system.This choice is not straightforward.Initially,state variables are assigned to all the energy-storage elements of the system.However,some of the energy storage elements may not be independent,and then some of the chosen state variables will be redundant.An approach is presented in the paper,with illustrative examples in the mixed fluid-mechanical domains,to illustrate a way to recognize dependent energy storage elements and thereby obtain a minimal state-space model.System analysis in the frequency domain is known to be more convenient than in the time domain,mainly because the relevant operations are algebraic rather than differential.For achieving this objective,the state space model has to be converted into a transfer function.The direct way is to first convert the state-space model into the input-output differential equation,and then substitute the time derivative by the Laplace variable.This approach is shown in the paper.The same result can be obtained through the transfer function linear graph(TF LG)of the system.In a multi-physics system,first the physical domains have to be converted into an equivalent single domain(preferably,the output domain of the system),when using the method of TFLG.This procedure is illustrated as well,in the present paper. 展开更多
关键词 Multi-physics Modelling Mechatronic Systems Linear Graphs Dependent Energy Storage Elements Redundant State Variables Minimal State-space Realization Domain Conversion Equivalent Models Frequency-domain Model
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Electrochemical machining gap prediction with multi-physics coupling model based on two-phase turbulence flow 认领 引用 被引量：5
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作者 Yuanlong CHEN Xiaochao ZHOU +1 位作者 Peixuan CHEN Ziquan WANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第3期1057-1063,共7页
Considering the influence of hydrogen gas generated during electrochemical machining on the conductivity of electrolyte, a two-phase turbulent flow model is presented to describe the gas bubbles distribution.The k-e t... Considering the influence of hydrogen gas generated during electrochemical machining on the conductivity of electrolyte, a two-phase turbulent flow model is presented to describe the gas bubbles distribution.The k-e turbulent model is used to describe the electrolyte flow field.The Euler–Euler model based on viscous drag and pressure force is used to calculate the twodimensional distribution of gas volume fraction.A multi-physics coupling model of electric field,two-phase flow field and temperature field is established and solved by weak coupling iteration method.The numerical simulation results of gas volume fraction, temperature and conductivity in equilibrium state are discussed.The distributions of machining gap at different time are analyzed.The predicted results of the machining gap are consistent with the experimental results, and the maximum deviation between them is less than 50 lm. 展开更多
关键词 Electrochemical machining Equilibrium Machining gap prediction Multi-physics coupling Two-phase turbulent flow
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Mechatronic Modeling and Domain Transformation of Multi-physics Systems 认领 引用
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作者 Clarence W.DE SILVA 《Instrumentation》 2021年第1期14-28,共15页
The enhanced definition of Mechatronics involves the four underlying characteristics of integrated,unified,unique,and systematic approaches.In this realm,Mechatronics is not limited to electro-mechanical systems,in th... The enhanced definition of Mechatronics involves the four underlying characteristics of integrated,unified,unique,and systematic approaches.In this realm,Mechatronics is not limited to electro-mechanical systems,in the multi-physics sense,but involves other physical domains such as fluid and thermal.This paper summarizes the mechatronic approach to modeling.Linear graphs facilitate the development of state-space models of mechatronic systems,through this approach.The use of linear graphs in mechatronic modeling is outlined and an illustrative example of sound system modeling is given.Both time-domain and frequency-domain approaches are presented for the use of linear graphs.A mechatronic model of a multi-physics system may be simplified by converting all the physical domains into an equivalent single-domain system that is entirely in the output domain of the system.This approach of converting(transforming)physical domains is presented.An illustrative example of a pressure-controlled hydraulic actuator system that operates a mechanical load is given. 展开更多
关键词 Mechatronic Modeling,Multi-physics Systems,Integrated,Unified,Unique and Systematic Approach Linear Graphs,Physical Domain Conversion/Transformation
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Transient multi-physics behavior of an insert high temperature superconducting no-insulation coil in hybrid superconducting magnets with inductive coupling 认领 引用 被引量：2
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作者 Xiang KANG Yujin TONG +1 位作者 Wei WU Xingzhe WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第2期255-272,共18页
A transient multi-physics model incorporated with an electromagneto-thermomechanical coupling is developed to capture the multi-field behavior of a single-pancake(SP)insert no-insulation(NI)coil in a hybrid magnet dur... A transient multi-physics model incorporated with an electromagneto-thermomechanical coupling is developed to capture the multi-field behavior of a single-pancake(SP)insert no-insulation(NI)coil in a hybrid magnet during the charging and discharging processes.The coupled problem is resolved by means of the finite element method(FEM)for the magneto-thermo-elastic behaviors and the Runge-Kutta method for the transient responses of the electrical circuits of the hybrid superconducting magnet system.The results reveal that the transient multi-physics responses of the insert NI coil primarily depend on the charging/discharging procedure of the hybrid magnet.Moreover,a reverse azimuthal current and a compressive hoop stress are induced in the insert NI coil during the charging process,while a forward azimuthal current and a tensile hoop stress are observed during the discharging process.The induced voltages in the insert NI coil can drive the currents flowing across the radial turns where the contact resistance exists.Therefore,it brings forth significant Joule heat,causing a temperature rise and a uniform distribution of this heat in the coil turns.Accordingly,a thermally/mechanically unstable or quenching event may be encountered when a high operating current is flowing in the insert NI coil.It is numerically predicted that a quick charging will induce a compressive hoop stress which may bring a risk of buckling instability in the coil,while a discharging will not.The simulations provide an insight of hybrid superconducting magnets under transient start-up or shutdown phases which are inevitably encountered in practical applications. 展开更多
关键词 hybrid superconducting magnet high temperature superconducting(HTS)no-insulation(NI)coil inductive coupling multi-physics field thermal stability
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A robust multi-objective and multi-physics optimization of multi-physics behavior of microstructure 认领 引用
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作者 Hamda Chagraoui Mohamed Soula Mohamed Guedri 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第12期3225-3238,共14页
A new strategy is presented to solve robust multi-physics multi-objective optimization problem known as improved multi-objective collaborative optimization （IMOCO） and its extension improved multi-objective robust c... A new strategy is presented to solve robust multi-physics multi-objective optimization problem known as improved multi-objective collaborative optimization （IMOCO） and its extension improved multi-objective robust collaborative （IMORCO）. In this work, the proposed IMORCO approach combined the IMOCO method, the worst possible point （WPP） constraint cuts and the Genetic algorithm NSGA-II type as an optimizer in order to solve the robust optimization problem of multi-physics of microstructures with uncertainties. The optimization problem is hierarchically decomposed into two levels： a microstructure level, and a disciplines levels, For validation purposes, two examples were selected： a numerical example, and an engineering example of capacitive micro machined ultrasonic transducers （CMUT） type. The obtained results are compared with those obtained from robust non-distributed and distributed optimization approach, non-distributed multi-objective robust optimization （NDMORO） and multi-objective collaborative robust optimization （McRO）, respectively. Results obtained from the application of the IMOCO approach to an optimization problem of a CMUT cell have reduced the CPU time by 44% ensuring a Pareto front close to the reference non-distributed multi-objective optimization （NDMO） approach （mahalanobis distance, D2M =0.9503 and overall spread, So=0.2309）. In addition, the consideration of robustness in IMORCO approach applied to a CMUT cell of optimization problem under interval uncertainty has reduced the CPU time by 23% keeping a robust Pareto front overlaps with that obtained by the robust NDMORO approach （D2M =10.3869 and So=0.0537）. 展开更多
关键词 multi-physics multi-objective optimization robust optimization collaborative optimization non-distributed anddistributed optimization uncertainty interval
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Environmental multi-physics coupled tribovoltaic effect for energy harvesting 认领 引用 被引量：1
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作者 Yuan Feng Zhi Zhang +4 位作者 Likun Gong Ruifei Luan Zhaozheng Wang Sicheng Dong Chi Zhang 《National Science Open》 CSCD 2025年第2期159-182,共24页
The tribovoltaic effect represents a newly discovered semiconductor effect for mechanical-to-electrical energy conversion.However,the semiconductor interfaces are typically susceptible to environmental multi-physics f... The tribovoltaic effect represents a newly discovered semiconductor effect for mechanical-to-electrical energy conversion.However,the semiconductor interfaces are typically susceptible to environmental multi-physics fields,such as illumination,temperature,and humidity,which can affect the energy conversion process of the tribovoltaic effect.In this review,we provide a comprehensive overview of the current research status of the environmental multi-physics coupled tribovoltaic effect for energy harvesting.We summarize the electrical output characteristics of tribovoltaic nanogenerators(TVNGs)in various physical field environments and the impact mechanisms of these fields on electrical performance,demonstrating their ability to capture and convert a wide range of mechanical energies,including wind,rain,waves,and illumination.We discuss the fundamental principles underlying these devices,their potential applications,and the key chal-lenges and opportunities for future development.This review deepens our understanding of the energy harvesting mechanism of the tribovoltaic effect in multi-physics coupling.Adopting a multi-physics energy harvesting strategy not only broadens the scope and efficiency of energy harvesting but also drives the development of novel energy conversion devices,proposing fresh ideas for future innovations in sustainable energy solutions. 展开更多
关键词 tribovoltaic effect multi-physics field semiconductor interface contact electrification energy harvesting
Research on reliability assessment method of harbinger solenoid valves based on multi-physics field coupled degradation 认领 引用
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作者 Shiyun Zhang Zhigeng Fang +3 位作者 Chengjie Zhang Yifan Yang Shuyu Xiao Zhi Sun 《Aerospace Traffic and Safety》 2025年第3期137-144,共8页
In response to the insufficient research on the multi-physics coupling degradation mechanisms of solenoid valves,a dual-factor coupled reliability model integrating spring stiffness degradation and seal leakage degrad... In response to the insufficient research on the multi-physics coupling degradation mechanisms of solenoid valves,a dual-factor coupled reliability model integrating spring stiffness degradation and seal leakage degradation is proposed.A nonlinear exponential decay with environmental compensation model(EDECM)is established to characterize the time-varying spring stiffness,and A Triple-Stage Fractal Contact Degradation Model(TSFCDM)is constructed based on fractal contact theory to describe the seal leakage degradation.Additionally,Wiener processes are introduced to depict the stochastic fluctuations of parameters.Monte Carlo simulations reveal that the reliability of the solenoid valve first drops to the 0.999 threshold within 296,000 usage cycles,with significant dispersion in the failure threshold distribution due to parameter uncertainties.Compared with traditional single-factor models,this coupled model effectively reduces prediction deviations by quantifying the bidirectional degradation mechanisms,meeting the precision requirements for the reliability threshold(>0.999)of aeronautical equipment. 展开更多
关键词 Reliability assessment Aerospace solenoid valves Multi-physics coupling Coupled degradation mechanisms Stochastic process modeling Failure threshold analysis
Multi-physical field coupling polishing of diamond for atomic-scale damage-free surface 认领 引用
19
作者 Song Yuan Chi Fai Cheung +2 位作者 Fengzhou Fang Han Huang Chunjin Wang 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第3期105-145,共41页
Diamond is renowned for its high stability in extreme environments, such as high temperatures,high pressures, and strong corrosive conditions, which makes it demonstrate irreplaceable superior performance in quantum d... Diamond is renowned for its high stability in extreme environments, such as high temperatures,high pressures, and strong corrosive conditions, which makes it demonstrate irreplaceable superior performance in quantum devices, high-power optical systems, and ultra-high-frequency electronic devices. Nevertheless, its intrinsic brittleness, difficulty in material removal, and vulnerability to damage caused by processing severely limit its practical application. The inherently rough surface of as-grown diamond necessitates precision polishing to obtain ultra-smooth, damage-free surface with nanometer-scale roughness, sub-micrometer form accuracy, and minimal subsurface damage. This paper provides a systematic review of state-of-the-art diamond polishing technologies, addressing the challenge of achieving sub-nanometer roughness and damage-free surface, with particular emphasis on the need for atomic-level surface integrity. The discussion covers laser polishing(LP), mechanical polishing(MP), ion beam polishing(IBP), gas cluster ion beam polishing(GCIBP), plasma polishing,dynamic friction polishing(DFP), chemical mechanical polishing(CMP), ultraviolet-assisted polishing(UVAP), plasma-assisted polishing(PAP), laser-assisted polishing(LAP),ultrasonic-assisted polishing(UAP), and other major techniques. By deconstructing these technological approaches, four fundamental material removal mechanisms, i.e., microfracture,graphitization, oxidation, physical sputtering and chemical etching, are identified. This highlights that hybrid, multi-physics polishing strategies can effectively balance the material removal rate(up to several µm·h-1) and surface quality(down to sub-nanometer scale),outperforming conventional single-field techniques. Finally, the review outlines future directions, emphasizing innovations in multi-physics coupling mechanisms and intelligent control of atomic-scale manufacturing processes, thereby providing theoretical guidance and technical pathways to overcome the coupled challenges of atomic precision, efficiency, and extreme service conditions. 展开更多
关键词 polishing diamond multi-physical field
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Virtual Simulation Modeling and Validation of Traffic Measurement Equipment Based on Multi-Physical Field Coupling 认领 引用
20
作者 Lin Zhou Jing Wang +3 位作者 Nan Wang Chi Zhang Zhongtian Jin Lucheng Wang 《Journal of Electronic Research and Application》 2026年第6期137-142,共6页
As the smart transportation system continues to evolve,the precise and stable operation of traffic measurement equipment directly determines the overall effectiveness of traffic data monitoring and system management.T... As the smart transportation system continues to evolve,the precise and stable operation of traffic measurement equipment directly determines the overall effectiveness of traffic data monitoring and system management.Traditional field tests are limited by specific operational scenarios,narrow coverage of driving conditions,high equipment wear and maintenance costs,and fail to meet the rigorous performance verification requirements under complex environments.This study integrates theories from mechanics,thermodynamics,and electromagnetism to establish a virtual simulation framework for traffic measurement equipment,enabling accurate replication of real-world operating conditions,conducting performance simulations,and facilitating continuous model refinement.This approach overcomes the limitations inherent in single-physical-field simulations.The outcomes provide robust digital support for equipment performance testing,structural optimization,and condition-specific calibration,thereby advancing the development and modernization of measurement systems in smart transportation applications. 展开更多
关键词 Multi-physics coupling Traffic measurement equipment Virtual simulation Modeling techniques Performance verification
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