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The use of the node-based smoothed finite element method to estimate static and seismic bearing capacities of shallow strip footings 认领 引用 被引量：9
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作者 H.C.Nguyen T.Vo-Minh 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第1期180-196,共17页
The node-based smoothed finite element method(NS-FEM)is shortly presented for calculations of the static and seismic bearing capacities of shallow strip footings.A series of computations has been performed to assess v... The node-based smoothed finite element method(NS-FEM)is shortly presented for calculations of the static and seismic bearing capacities of shallow strip footings.A series of computations has been performed to assess variations in seismic bearing capacity factors with both horizontal and vertical seismic accelerations.Numerical results obtained agree very well with those using the slip-line method,revealing that the magnitude of the seismic bearing capacity is highly dependent upon the combinations of various directions of both components of the seismic acceleration.An upward vertical seismic acceleration reduces the seismic bearing capacity compared to the downward vertical seismic acceleration in calculations.In addition,particular emphasis is placed on a separate estimation of the effects of soil and superstructure inertia on each seismic bearing capacity component.While the effect of inertia forces arising in the soil on the seismic bearing capacity is non-trivial,and the superstructure inertia is the major contributor to reductions in the seismic bearing capacity.Both tables and charts are given for practical application to the seismic design of the foundations. 展开更多
关键词 Limit analysis Node-based smoothed finite element method(NS-FEM) Second-order cone programming(SOCP) Seismic bearing capacity Strip footing
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Matching authority and VGI road networks using an extended node-based matching algorithm 认领 引用 被引量：4
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作者 Ehsan ABDOLMAJIDI Ali MANSOURIAN +1 位作者 Julian WILL Lars HARRIE 《Geo-Spatial Information Science》 EI CSCD 2015年第2期65-80,共16页
The amount of volunteered geographic information(VGI)has increased over the past decade,and several studies have been conducted to evaluate the quality of VGI data.In this study,we evaluate the completeness of the roa... The amount of volunteered geographic information(VGI)has increased over the past decade,and several studies have been conducted to evaluate the quality of VGI data.In this study,we evaluate the completeness of the road network in the VGI data set OpenStreetMap(OSM).The evaluation is based on an accurate and efficient network-matching algorithm.The study begins with a comparison of the two main strategies for network matching:segment-based and nodebased matching.The comparison shows that the result quality is comparable for the two strategies,but the node-based result is considerably more computationally efficient.Therefore,we improve the accuracy of node-based algorithm by handling topological relationships and detecting patterns of complicated network components.Finally,we conduct a case study on the extended node-based algorithm in which we match OSM to the Swedish National Road Database(NVDB)in Scania,Sweden.The case study reveals that OSM has a completeness of 87%in the urban areas and 69%in the rural areas of Scania.The accuracy of the matching process is approximately 95%.The conclusion is that the extended node-based algorithm is sufficiently accurate and efficient for conducting surveys of the quality of OSM and other VGI road data sets in large geographic regions. 展开更多
关键词 geographic data volunteered geographic information(VGI) OpenStreetMap(OSM) node-based matching segment-based matching pattern detection Swedish National Road Database(NVDB)
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Coupling Magneto-Electro-Elastic node-based smoothed radial point interpolation method for free vibration and transient analysis of Functionally Graded Magneto-Electro-Elastic structures 认领 引用 被引量：2
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作者 Liming ZHOU Shuhui REN +2 位作者 Bin NIE Guikai GUO Xiangyang CUI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第1期227-243,共17页
A Coupling Magneto-Electro-Elastic(MEE)Node-based Smoothed Radial Point Interpolation Method(CM-NS-RPIM)was proposed to solve the free vibration and transient responses of Functionally Graded Magneto-Electro-Elastic(F... A Coupling Magneto-Electro-Elastic(MEE)Node-based Smoothed Radial Point Interpolation Method(CM-NS-RPIM)was proposed to solve the free vibration and transient responses of Functionally Graded Magneto-Electro-Elastic(FGMEE)structures.By introducing the modified Newmark method,the displacement,electrical potential and magnetic potential of the structures under transient mechanical loading were obtained.Based on G space theory and the weakened weak(W2)formulation,the equations of the multi-physics coupling problems were derived.Using triangular background elements,the free vibration and transient responses of three numerical examples were studied.Results proved that CM-NS-RPIM performed better than the standard FEM by reducing the overly-stiff of structures.Moreover,CM-NS-RPIM could reduce the number of nodes while guaranteeing the accuracy.Besides,triangular elements could be generated automatically even for complex geometries.Therefore,the effectiveness and validity of CM-NS-RPIM were demonstrated,which were valuable for the design of intelligence devices,such as energy harvesters and sensors. 展开更多
关键词 Coupling Magneto-Electro-Elastic node-based smoothed radial point interpolation method Functionally Graded Magneto-Electro-Elastic Gradient smoothing technique Rayleigh damping Transient responses
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Complexity of Reducing the Delay between Two Nodes by Node-based and Edge-based Upgrading Strategies 认领 引用
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作者 Xiao-guangYang Jian-zhongZhang 《Acta Mathematicae Applicatae Sinica》 2004年第4期589-596,共8页
For a pair of nodes s, t in an undirected graph G = (V, A) and a given level U of allowable delay, we would like to modify the network by node-based or edge-based upgrading strategies to make the delay between s and t... For a pair of nodes s, t in an undirected graph G = (V, A) and a given level U of allowable delay, we would like to modify the network by node-based or edge-based upgrading strategies to make the delay between s and t not greater than U. In this paper, we present some NP-hard results for the delay improvement problems. 展开更多
关键词 Node-based upgrade edge-based upgrade even-odd partition hard
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A novel hybrid surrogate model for the stability and post-failure analysis of spatially variable slopes using a smoothed sequential limit analysis 认领 引用
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作者 H.Xu H.C.Nguyen +4 位作者 M.Nazem X.He X.Chen R.Sousa J.Kowalski 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3365-3393,共29页
This study presents a novel framework for evaluating slope stability in spatially variable soils by integrating a newly developed sequential limit analysis based on the Hellinger-Reissner functional,utilizing the node... This study presents a novel framework for evaluating slope stability in spatially variable soils by integrating a newly developed sequential limit analysis based on the Hellinger-Reissner functional,utilizing the node-based smoothed finite element method(NS-FEM),with a newly proposed deep learning(DL)approach termed multi-downsampling hybrid Linformer-convolutional neural networks(CNNs).The NS-FEM-based mixed formulation of limit analysis(MFLA)enhances computational accuracy and convergence by smoothing strain fields and mitigating numerical discontinuities commonly encountered in standard finite element methods(FEMs).This method generates reliable datasets for stochastic simulations of slope stability under both static and seismic loading conditions.To address the computational expense of specific simulations,we propose the multi-downsampling hybrid Linformer-CNN model,a sophisticated DL architecture that employs dual parallel pathways with distinct downsampling strategies–AveragePooling1D for medium-scale feature extraction and MaxPooling1D for coarse-scale feature extraction.Each pathway integrates one-dimensional(1D)CNNs for local feature extraction and Linformer-based self-attention mechanisms to efficiently capture global dependencies.The parallel downsampling strategies balance computational efficiency with feature granularity,enabling the model to leverage both local and global data characteristics effectively.The extracted multi-scale features are concatenated and further processed through fully connected networks(FCNs)to accurately predict the factor of safety(FoS)of slopes.Comparative analyses demonstrate that the hybrid Linformer-CNN model outperforms traditional FCN and CNN architectures,achieving robust and precise predictions with a mean absolute percentage error(MAPE)below 10%.Additionally,the proposed framework significantly reduces computational time,highlighting the potential of integrating NS-FEM-based MFLA with advanced DL architectures for rapid and reliable slope stability assessment in geotechnical engineering. 展开更多
关键词 Mixed formulation of limit analysis(MFLA) Node-based smoothed finite element method(NS-FEM) Multi-downsampling hybrid Linformer-CNN Slope stability Deep learning(DL)surrogate models
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APPLICATION OF MFCAV RIEMANN SOLVER TO MAIRE'S CELL-CENTERED LAGRANGIAN METHOD 认领 引用 被引量：1
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作者 Yan Liu Baolin Tian +3 位作者 Weidong Shen Shuanghu Wang Song Jiang Dekang Mao 《Journal of Computational Mathematics》 SCIE CSCD 2015年第2期128-145,共18页
In this paper, we apply arbitrary Riemann solvers, which may not satisfy the Maire＇s requirement, to the Maire＇s node-based Lagrangian scheme developed in [P. H. Maire et al., SIAM J. Sci. Comput, 29 （2007）, 1781-... In this paper, we apply arbitrary Riemann solvers, which may not satisfy the Maire＇s requirement, to the Maire＇s node-based Lagrangian scheme developed in [P. H. Maire et al., SIAM J. Sci. Comput, 29 （2007）, 1781-1824]. In particular, we apply the so-called Multi-Fluid Channel on Averaged Volume （MFCAV） Riemann solver and a Riemann solver that adaptively combines the MFCAV solver with other more dissipative Riemann solvers to the Maire＇s scheme. It is noted that neither of the two solvers satisfies the Maire＇s requirement. Numerical experiments are presented to demonstrate that the application of the two Riemann solvers is successful. 展开更多
关键词 Maire＇s node-based Lagrangian scheme Riemann solvers Riemann invariants,weighted least squares procedure.
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