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end-to-end 3d seismic simulation of underground structures due to point dislocation source by using an FK-FEMhybrid approach

Zhenning BA; Jisai FU; Zhihui ZHU; Hao ZHONG

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 12,   Pages 1515-1529 doi: 10.1007/s11709-022-0887-0

Abstract: Based on the domain reduction idea and artificial boundary substructure method, this paper proposes an FK-FEMhybrid approach by integrating the advantages of FK and FEM (i.e., FK can efficiently generate high-frequencythree translational motion, while FEM has rich elements types and constitutive models).An advantage of this approach is that it realizes the entire process simulation from point dislocationCompared with the plane wave field input method, the FK-FEM hybrid approach can reflect the spatial variability

Keywords： source-to-structure simulation     FK-FEM hybrid approach     underground structures     point dislocation source    

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Implementation aspects of a phase-field approach for brittle fracture

G. D. HUYNH, X. ZHUANG, H. NGUYEN-XUAN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 417-428 doi: 10.1007/s11709-018-0477-3

Abstract: This paper provides a comprehensive overview of a phase-field model of fracture in solid mechanics setting. We start reviewing the potential energy governing the whole process of fracture including crack initiation, branching or merging. Then, a discretization of system of equation is derived, in which the key aspect is that for the correctness of fracture phenomena, a split into tensile and compressive terms of the strain energy is performed, which allows crack to occur in tension, not in compression. For numerical analysis, standard finite element shape functions are used for both primary fields including displacements and phase field. A staggered scheme which solves the two fields of the problem separately is utilized for solution step and illustrated with a segment of Python code.

Keywords： phase-field modeling     FEM     staggered scheme     fracture    

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Optimization design of an interior permanent-magnet synchronous machine for a hybrid hydraulic excavator

Qi-huai CHEN,Qing-feng WANG,Tao WANG

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 11,   Pages 957-968 doi: 10.1631/FITEE.1500056

Abstract: A hybrid power transmission system (HPTS) is a promising way to save energy in a hydraulic excavatorIn this paper, a design process for permanent-magnet synchronous machines (PMSMs) in a hybrid hydraulicA parameterized design approach, which combines the analytical model and the 2D finite element method(FEM), is applied to the electric machine to improve the design efficiency and accuracy.The rotor is designed with the FEM to satisfy the flux requirements obtained in stator design.

Keywords： Analysis     Design     Hybrid hydraulic excavator (HHE)     Finite element method (FEM)     Interior permanent-magnet    

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Vibration-based crack prediction on a beam model using hybrid butterfly optimization algorithm with artificial

Abdelwahhab KHATIR; Roberto CAPOZUCCA; Samir KHATIR; Erica MAGAGNINI

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 8,   Pages 976-989 doi: 10.1007/s11709-022-0840-2

Abstract: This paper presents a new approach to identify the crack depth in steel beam structures based on vibrationanalysis using the Finite Element Method (FEM) and Artificial Neural Network (ANN) combined with ButterflyThis paper improves ANN training after introducing BOA as a hybrid model (BOA-ANN).The data are collected from improved FEM using simulation tools (ABAQUS) based on different crack depthsThe proposed approach, compared to other methods, can predict crack depth with improved accuracy.

Keywords： damage prediction     ANN     BOA     FEM     experimental modal analysis    

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Nonlinear sealing force of a seawater balance valve used in an 11000-meter manned submersible

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0726-y

Abstract: A hybrid analytical–numerical–experimental (ANE) model is proposed to obtain the minimum sealing forceand the remaining unknown coefficients of the equations are obtained by the finite element method (FEMThe accuracy of the equation is evaluated by comparing the independent FEM data to the equation data.Results of the comparison show good agreement, and the difference between the independent FEM data and

Keywords： seawater balance valve     sealing performance     hybrid ANE model     FEM     minimum sealing force equation    

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Two-scale modeling of granular materials: A FEM-FEM approach

Yun-Zhu CAI, Yu-Ching WU

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 304-315 doi: 10.1007/s11709-013-0213-y

Abstract: In the present paper, a homogenization-based two-scale FEM-FEM model is developed to simulate compactionsThe two-scale FEM-FEM model is developed in which each particle is treated individually with the appropriate

Keywords： homogenization     two-scale     representative volume element     compaction     granular assembly     finite element method    

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3D finite element method (FEM) simulation of groundwater flow during backward erosion piping

Kristine VANDENBOER,Vera van BEEK,Adam BEZUIJEN

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 2,   Pages 160-166 doi: 10.1007/s11709-014-0257-7

Abstract: In this work, a 3D numerical approach of the groundwater flow leading to the erosion mechanism of backwardclearly indicate the superiority of the presented 3D numerical model compared to the established 2D approach

Keywords： backward erosion piping     groundwater flow     3D finite element method (FEM)    

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Research on acoustic-structure sensitivity using FEM and BEM

ZHANG Jun, ZHAO Wenzhong, ZHANG Weiying

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 62-67 doi: 10.1007/s11465-007-0010-1

Abstract: Using FEM (finite element method) and BEM (boundary element method) acoustic-structure sensitivity wasvelocity sensitivity with respect to structure design variable were carried out by using structural FEMThen, acoustic-structure sensitivity was computed by linking velocity sensitivity in FEM and acousticResults show that acoustic-structure sensitivity method linked with FEM and BEM is effective and correct

Keywords： sensitivity method     BEM     acoustic pressure     pressure sensitivity     frequency    

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FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4,   Pages 373-379 doi: 10.1007/s11465-015-0371-9

Abstract: To further explore the novel method, this study conducts a finite element method-based (FEM-based) strain

Keywords： finite element method (FEM)     strain analysis     multilayer sheet forming    

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Intelligent hybrid power generation system using new hybrid fuzzy-neural for photovoltaic system and

Alireza REZVANI,Ali ESMAEILY,Hasan ETAATI,Mohammad MOHAMMADINODOUSHAN

Frontiers in Energy 2019, Volume 13, Issue 1,   Pages 131-148 doi: 10.1007/s11708-017-0446-x

Abstract: In this paper, a novel topology of an intelligent hybrid generation system with PV and wind turbine isIn order to capture the maximum power, a hybrid fuzzy-neural maximum power point tracking (MPPT) methodThe average tracking efficiency of the hybrid fuzzy-neural is incremented by approximately two percentageDetailed mathematical model and a control approach of a three-phase grid-connected intelligent hybrid

Keywords： photovoltaic     wind turbine     hybrid system     fuzzy logic controller     genetic algorithm     RBFNSM    

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The smoothed finite element method (S-FEM): A framework for the design of numerical models for desired

Gui-Rong Liu

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 456-477 doi: 10.1007/s11709-019-0519-5

Abstract:

The smoothed finite element method (S-FEM) was originated by G R Liu by combining some meshfree techniqueswith the well-established standard finite element method (FEM).article first provides a concise and easy-to-follow presentation of key formulations used in the S-FEMA number of important properties and unique features of S-FEM models are discussed in detail, includingThe S-FEM is thus ideal for automation in computations and adaptive analyses, and hence has profound

Keywords： computational method     finite element method     smoothed finite element method     strain smoothing technique     smoothing domain     weakened weak form     solid mechanics     softening effect     upper bound solution    

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Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 478-490 doi: 10.1007/s11709-015-0317-7

Abstract: This paper presents a simple and efficient approach for predicting the plastic limit loads in cracked

Keywords： cracked structure     limit analysis     von Mises criterion     edge-based strain smoothing     second-order cone programming     adaptive    

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Slope Stability Analysis by Strength Reduction FEM

Zheng Yingren,Zhao Shangyi,Zhang Luyu

Strategic Study of CAE 2002, Volume 4, Issue 10,   Pages 57-61

Abstract: Strength Reduction FEM (SRFEM) presents a powerful alternative approach for slope stability analysis,This paper analyzes the precision and error caused by different soil yield criterions、FEM itself、slopeseries of case studies, the results show average error of safety factor between Strength Reduction FEM

Keywords： slope stability analysis     strength reduction by FEM     yield criterions    

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Robust ensemble of metamodels based on the hybrid error measure

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 3,   Pages 623-634 doi: 10.1007/s11465-021-0641-7

Abstract: The weight factor is adaptively determined according to the hybrid error metric, which combines global

Keywords： metamodel     ensemble of metamodels     hybrid error measure     stochastic problem    

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An extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) for free vibration analysis

M. H. NGUYEN-THOI,L. Le-ANH,V. Ho-HUU,H. Dang-TRUNG,T. NGUYEN-THOI

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 341-358 doi: 10.1007/s11709-015-0302-1

Abstract: A cell-based smoothed discrete shear gap method (CS-FEM-DSG3) was recently proposed and proven to beIn addition, due to using only three-node triangular elements generated automatically, the CS-FEM-DSG3However so far, the CS-FEM-DSG3 has been only developed for analyzing intact structures without possessingThe paper hence tries to extend the CS-FEM-DSG3 for free vibration analysis of cracked Reissner-Mindlinshells by integrating the original CS-FEM-DSG3 with discontinuous and crack−tip singular enrichment

Keywords： cracked Reissner-Mindlin shell     free vibration analysis     cell-based smoothed discrete shear gap method (CS-FEM-DSG3)     extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3)     smoothed finite element methods    

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Title Author Date Type Operation

end-to-end 3d seismic simulation of underground structures due to point dislocation source by using an FK-FEMhybrid approach

Zhenning BA; Jisai FU; Zhihui ZHU; Hao ZHONG

Journal Article

Implementation aspects of a phase-field approach for brittle fracture

G. D. HUYNH, X. ZHUANG, H. NGUYEN-XUAN

Journal Article

Optimization design of an interior permanent-magnet synchronous machine for a hybrid hydraulic excavator

Qi-huai CHEN,Qing-feng WANG,Tao WANG

Journal Article

Vibration-based crack prediction on a beam model using hybrid butterfly optimization algorithm with artificial

Abdelwahhab KHATIR; Roberto CAPOZUCCA; Samir KHATIR; Erica MAGAGNINI

Journal Article

Nonlinear sealing force of a seawater balance valve used in an 11000-meter manned submersible

Journal Article

Two-scale modeling of granular materials: A FEM-FEM approach

Yun-Zhu CAI, Yu-Ching WU

Journal Article

3D finite element method (FEM) simulation of groundwater flow during backward erosion piping

Kristine VANDENBOER,Vera van BEEK,Adam BEZUIJEN

Journal Article

Research on acoustic-structure sensitivity using FEM and BEM

ZHANG Jun, ZHAO Wenzhong, ZHANG Weiying

Journal Article

FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

Journal Article

Intelligent hybrid power generation system using new hybrid fuzzy-neural for photovoltaic system and

Alireza REZVANI,Ali ESMAEILY,Hasan ETAATI,Mohammad MOHAMMADINODOUSHAN

Journal Article

The smoothed finite element method (S-FEM): A framework for the design of numerical models for desired

Gui-Rong Liu

Journal Article

Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

Journal Article

Slope Stability Analysis by Strength Reduction FEM

Zheng Yingren,Zhao Shangyi,Zhang Luyu

Journal Article

Robust ensemble of metamodels based on the hybrid error measure

Journal Article

An extended cell-based smoothed discrete shear gap method (XCS-FEM-DSG3) for free vibration analysis

M. H. NGUYEN-THOI,L. Le-ANH,V. Ho-HUU,H. Dang-TRUNG,T. NGUYEN-THOI

Journal Article