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A novel semi-analytical model for pressure transient analysis of fault-controlled fractured-caved gas reservoirs and field applications 认领 引用
1
作者 Pin Jia Quan-Yu Pan +3 位作者 Jia Li Jiang-Peng Hu Yu-Cheng Wu Lin-Song Cheng 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期332-349,共18页
Fractured-caved gas reservoirs are widely distributed and hold substantial reserves in northwestern China,showing considerable development potential.However,their strong heterogeneity and significant variations presen... Fractured-caved gas reservoirs are widely distributed and hold substantial reserves in northwestern China,showing considerable development potential.However,their strong heterogeneity and significant variations present challenges.Conventional multi-media well test interpretation models are not well-suited to fractu red-caved gas reservoirs,while more suitable numerical models often require lengthy modeling times and extensive computations.To address these limitations,this paper introduces an efficient semi-analytical well test interpretation model adaptable to various fracture-cave combinations.This model integrates methods such as fluid flow and storage flow theory,the point source solution method,and multi-para meter optimization.Results demonstrate that for different wellbore-fracture-cave configurations,the point source solution method requires only the construction of a coupled solution matrix for each unit to obtain the pressure and flow rate distributions,significantly reducing the workload associated with model setup and solution.Additionally,applying the semianalytical models to typical wells in the Shunbei field yielded strong fitting accuracy and effectively inverted key parameters related to the wellbore,fracture regions,and caves.The models developed in this paper provide valuable guidance for the efficient development of fractu red-caved reservoirs. 展开更多
关键词 Semi-analytical model Fault-controlled fractured-caved gas reservoirs Pressure transient analysis Large-scale caves Point source solution
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Semi-analytical modeling and dynamic improvement of a high-speed on/off valve considering nonlinear flux leakage of working air gaps 认领 引用
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作者 Lingkang Meng Defa Wu +3 位作者 Xujun Ye Jize Jiang Zhuo Mi Yinshui Liu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第2期363-373,共11页
A high-speed on/off valve(HSV)is a core component of aerospace digital hydraulic systems,and its dynamic performance is crucial for system reliability.A multistage voltage control(MSVC)strategy that uses currentbased ... A high-speed on/off valve(HSV)is a core component of aerospace digital hydraulic systems,and its dynamic performance is crucial for system reliability.A multistage voltage control(MSVC)strategy that uses currentbased feedback can improve dynamic characteristics.However,setting the critical feedback parameters,including the pre-opening and pre-closing currents,for the MSVC strategy depends on an accurate mathematical model of the HSV,particularly its magnetic model.Existing magnetic models typically ignore the changes in the magnetic flux leakage of the working air gaps(WAGs)to simplify the model,leading to deviations in the electromagnetic force calculations and limiting the potential of the MSVC strategy.This study presents a refined magnetic model using an equivalent magnetic circuit method that incorporates variations in the flux leakage of WAGs.Effective magnetic flux coefficients are introduced to quantify flux leakage.The relationship between the effective flux coefficients and the thickness of the WAGs is revealed by finite element simulation.A high-precision semi-analytical magnetic model for the HSV was established.Based on this,a current-based feedback MSVC strategy is proposed to improve the HSV dynamics.The simulation and experimental results validate the proposed model and control strategy.The results indicate that the effective flux coefficients decrease nonlinearly with the thickness of the WAGs,following a cubic relationship.The proposed model closely aligns with experimental data,exhibiting maximum deviations of only 6.0%(3.6 N)for electromagnetic force and 2.9%(0.39 ms)for total response time.Furthermore,compared with the previous model,utilizing the proposed model allows more accurate feedback parameter settings for the MSVC strategy,significantly reducing opening delay time by 70.7%(0.52 ms).This study offers a practical approach for fine modeling and dynamic performance improvement of HSVs. 展开更多
关键词 High-speed on/off valve Semi-analytical modeling Finite element analysis Dynamic characteristics Flux leakage
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Generalized semi-analytical modeling of three-dimensional contact responses in piezoelectric semiconductors with conductive indenters 认领 引用
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作者 Ling WANG Huoming SHEN Yuxing WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第3期555-572,共18页
Piezoelectric semiconductor(PSC)materials exhibit strong electromechanical coupling affected by free carriers,which makes their contact behavior essential for sensors,actuators,and electronic devices.Analytical models... Piezoelectric semiconductor(PSC)materials exhibit strong electromechanical coupling affected by free carriers,which makes their contact behavior essential for sensors,actuators,and electronic devices.Analytical models for three-dimensional(3D)PSC contact problems are still scarce,especially for conductive indenters.This work develops a semi-analytical framework to study the 3D frictionless contact between a conductive indenter and a PSC half-space.Fundamental solutions under a unit force and a unit electric charge are derived,and the corresponding frequency response functions are combined with a discrete convolution-fast Fourier transform(DC-FFT)algorithm to achieve an efficient semi-analytical contact model.The numerical results demonstrate that an increase in the surface charge density reduces the indentation pressure and modifies the electric potential distribution.A higher steady carrier concentration enhances the screening effect,suppresses the electromechanical coupling,and shifts the system response toward purely elastic behaviors.The sensitivity analysis shows that the indentation depth is dominated by the elastic constants,while the electric potential is mainly affected by the piezoelectric coefficient.Although the analysis is carried out with spherical indenters,the model is not limited to a specific indenter shape.It provides an effective tool for investigating complex 3D PSC contact problems and offers useful insights into the design of PSC materials-based devices. 展开更多
关键词 contact mechanics semi-analytical method piezoelectric semiconductor(PSC) conductive indenter electromechanical response
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Fast simulation of EM telemetry in vertical drilling:A semi-analytical finite-element method with virtual layering technique 认领 引用
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作者 Hao Liang Chang-Chun Yin +4 位作者 Yang Su Yun-He Liu Jun Li Ruo-Yun Gao Li-Bao Wang 《Petroleum Science》 SCIE EI CAS CSCD 2025年第8期3304-3314,共11页
The electromagnetic(EM)telemetry systems,employed for real-time data transmission from the borehole and the earth surface during drilling,are widely used in measurement-while-drilling(MWD)and logging-while-drilling(LW... The electromagnetic(EM)telemetry systems,employed for real-time data transmission from the borehole and the earth surface during drilling,are widely used in measurement-while-drilling(MWD)and logging-while-drilling(LWD).Several numerical methods,including the method of moments(MoM),the electric field integral equation(EFIE)method,and the finite-element(FE)method have been developed for the simulation of EM telemetry systems.The computational process of these methods is complicated and time-consuming.To solve this problem,we introduce an axisymmetric semi-analytical FE method(SAFEM)in the cylindrical coordinate system with the virtual layering technique for rapid simulation of EM telemetry in a layered earth.The proposed method divides the computational domain into a series of homogeneous layers.For each layer,only its cross-section is discretized,and a high-precision integration method based on Riccati equations is employed for the calculation of longitudinally homogeneous sections.The block-tridiagonal structure of the global coefficient matrix enables the use of the block Thomas algorithm,facilitating the efficient simulation of EM telemetry problems in layered media.After the theoretical development,we validate the accuracy and efficiency of our algorithm through a series of numerical experiments and comparisons with the Multiphysics modeling software COMSOL.We also discussed the impact of system parameters on EM telemetry signal and demonstrated the applicability of our method by testing it on a field dataset acquired from Dezhou,Shandong Province,China. 展开更多
关键词 Electromagnetic telemetry Semi-analytical finite-element method Riccati equations High-precision integration scheme Block thomas algorithm
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Semi-analytical approach for magneto-fluid-solid interaction dynamics of thin rectangular column 认领 引用
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作者 Jing-Yu Fu Ming-Jiu Ni Nian-Mei Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第9期1-16,共16页
This work focuses on the fluid-rigid interaction dynamics in the presence of a magnetic field.A rigid thin rectangular column immersed inside stationary metal liquid vibrates with a fixed small amplitude.The magneto-f... This work focuses on the fluid-rigid interaction dynamics in the presence of a magnetic field.A rigid thin rectangular column immersed inside stationary metal liquid vibrates with a fixed small amplitude.The magneto-fluid-solid interaction(MFSI)dynamics issue is studied based on the complex Green’s function method.Considering either the normal or tangential vibration of a column,two types of semi-analytical solutions expressed by stream function integral equations of magnetic corrections,describing the time-displacement history of the column,flow field and electrical potential field of metal fluid and representing transient coupling effects of multi-physics field,are derived,respectively.Nonuniform discretization schemes and an iterative plan are applied to evaluate added damping and inertial loads.The results show that the main factor affecting normal vibration is pressure load,and the main factor affecting tangential vibration is vorticity load.The nonlinear effects of magnetic fields on the dynamics of fluid-rigid thin columns are revealed.The normal vibration exhibits better stability than the tangential vibration under the magnetic field.The induced electrical potential field and current intensity excited by normal vibration are significantly stronger than that of tangential vibration.These semi-analytical solutions can be applied as benchmarks in future validation and verification works for MFSI numerical algorithms for magnetic confinement nuclear fusion science. 展开更多
关键词 Magneto-fluid-solid interaction MHD Vibration Semi-analytical solution
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Semi-analytical model for flat indentation of metal materials and its applications 认领 引用 被引量：15
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作者 Xiaokun LIU Lixun CAI +1 位作者 Hui CHEN Shuqian SI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第12期3266-3277,共12页
The increasing use of small material components in a wide range of industrial fields necessitates the development of an accurate and robust indentation testing method.To this end,this paper proposes an Energy-density-... The increasing use of small material components in a wide range of industrial fields necessitates the development of an accurate and robust indentation testing method.To this end,this paper proposes an Energy-density-equivalence for a Flat Indentation(E-FI)model based on the energy density equivalent principle.The proposed model describes the relationships among the material parameters of Hollomon's power law(H-law),flat indenter diameter,energy,and indentation displacement.An E-FI Method(E-FIM)that determines the H-law parameters of materials through the indentation test is also developed.The energy-displacement curves forward-predicted by the E-FI model(based on known H-law parameters of materials)and the H-law parameters of materials given by the E-FIM(based on known energy-displacement curves)are consistent with the results of Finite Element Analysis(FEA)and the H-law parameters of materials used as the input for FEA,respectively.Using E-FIM,the goodness of fit for both stress–strain curves with H-law,predicted based on the displacement with 2%signal interference,and that for stress–strain curves without interference is more than 0.98.The stress–strain relations predicted by E-FIM were consistent with the results obtained via uniaxial tensile tests of ten ductile materials. 展开更多
关键词 Energy-density-equivalence Flat indentation Power-law material Semi-analytical model Stress–strain relationship
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A Semi-Analytical Potential Solution for Wave Resonance in Gap Between Floating Box and Vertical Wall 认领 引用 被引量：5
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作者 LIU Yong LI Hua-jun +2 位作者 LU Lin LI Ai-jun TAN Lei 《China Ocean Engineering》 SCIE EI CSCD 2020年第6期747-759,共13页
Based on potential flow theory, a dissipative semi-analytical solution is developed for the wave resonance in the narrow gap between a fixed floating box and a vertical wall by using velocity potential decompositions ... Based on potential flow theory, a dissipative semi-analytical solution is developed for the wave resonance in the narrow gap between a fixed floating box and a vertical wall by using velocity potential decompositions and matched eigenfunction expansions. The energy dissipation near the box is modelled in the potential flow solution by introducing a quadratic pressure loss condition on the gap entrance. Such a treatment is inspired by the classical local head loss formula for the sudden change of cross section in channel flow, where the energy dissipation is assumed to be proportional to the square of local velocity for high Reynolds number flows. The dimensionless energy loss coefficient is calibrated based on experimental data. And it is found to be insensitive to the incident wave height and wave frequency. With the calibrated energy loss coefficient, the resonant wave height in gap and the reflection coefficient are calculated by the present dissipative semi-analytical solution. The predictions are in good agreement with experimental data. Case studies suggest that the maximum relative energy dissipation occurs near the resonant frequency, which leads to the minimum reflection coefficient. The horizontal wave forces on the box and the vertical wall attain also maximum values near the resonant frequency, while the vertical wave force on the box decreases abruptly there to a small value. 展开更多
关键词 gap resonance semi-analytical solution quadratic pressure loss reflection coefficient wave forces iterative calculations
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Semi-analytical solution for internal forces of tunnel lining with multiple longitudinal cracks 认领 引用 被引量：6
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作者 Gan Wang Qian Fang +1 位作者 Jianming Du Jun Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第8期2013-2024,共12页
Longitudinal cracks on the tunnel lining significantly influence the performance of tunnels in operation.In this study,we propose a semi-analytical method that provides a simple and effective way to calculate the inte... Longitudinal cracks on the tunnel lining significantly influence the performance of tunnels in operation.In this study,we propose a semi-analytical method that provides a simple and effective way to calculate the internal forces of tunnel linings with multiple cracks.The semi-analytical solution is obtained using structural analysis considering the flexural rigidity for the cracked longitudinal section of the tunnel lining.Then the proposed solution is verified numerically.Using the proposed method,the influences of the crack depth and the number of cracks on the bending moment and modified crack tip stress are investigated.With the increase in crack depth,the bending moment of lining scetion adjacent to the crack decreases,while the bending moment of lining scetion far away from the crack increases slightly.The more the number of cracks in a tunnel lining,the easier the new cracks initiated. 展开更多
关键词 Semi-analytical method Multiple cracks Tunnel lining Structural analysis
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Consolidation of partially saturated ground improved by impervious column inclusion:Governing equations and semi-analytical solutions 认领 引用 被引量：5
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作者 Lei Wang Annan Zhou +1 位作者 Yongfu Xu Xiaohe Xia 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第3期837-850,共14页
This study focuses on the consolidation behavior and mathematical interpretation of partially-saturated ground improved by impervious column inclusion.The constitutive relations for soil skeleton,pore air and pore wat... This study focuses on the consolidation behavior and mathematical interpretation of partially-saturated ground improved by impervious column inclusion.The constitutive relations for soil skeleton,pore air and pore water for partially saturated soils are proposed in the context of partially-saturated ground improved by impervious column inclusion.Settlement equation and dissipation equations of excess pore air/water pressures for a partially saturated improved ground are then derived.The semi-analytical solutions for ground settlement and pore pressure dissipation are then obtained through the Laplace transform and validated by the existing solutions for two special cases in the literature and the numerical results obtained from the finite difference method.A series of parametric studies is finally conducted to investigate the influence of some key factors on consolidation of partially saturated ground improved by impervious column inclusion.Based on the parametric study,it can be found that a higher value of the area replacement ratio or modulus of the pile results in a longer dissipation time of excess pore air pressure(PAP),a shorter dissipation time of excess pore water pressure(PWP),and a lower normalized settlement. 展开更多
关键词 Semi-analytical solution Consolidation Partially saturated soil Ground improvement Impervious column inclusion
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Semi-analytical solutions to one-dimensional consolidation for unsaturated soils with semi-permeable drainage boundary 认领 引用 被引量：6
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作者 Lei WANG De'an SUN Yongfu XU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2017年第10期1439-1458,共20页
The semi-analytical solutions to Fredlund and Hasan＇s one-dimensional （1D） consolidation for unsaturated soils with a semi-permeable drainage boundary are pre- seated. Two variables are introduced to transform the ... The semi-analytical solutions to Fredlund and Hasan＇s one-dimensional （1D） consolidation for unsaturated soils with a semi-permeable drainage boundary are pre- seated. Two variables are introduced to transform the two coupled governing equations of pore-water and pore-air pressures into an equivalent set of partial differential equations （PDFs）, which are easily solved by the Laplace transform method. Then, the pore-water pressure, pore-air pressure, and soil settlement are obtained in the Laplace domain. The Crump method is adopted to perform the inverse Laplace transform in order to obtain the semi-analytical solutions in the time domain. It is shown that the proposed solutions are more applicable to various types of boundary conditions and agree well with the existing solutions from the literature. Several numerical examples are provided to investigate the consolidation behavior of an unsaturated single-layer soil with single, double, mixed, and semi-permeable drainage boundaries. The changes in the pore-air and pore-water pres- sures and the soil settlement with the time factor at different values of the semi-permeable drainage boundary parameters are illustrated. In addition, parametric studies are con- ducted on the pore-air and pore-water pressures at different ratios （the air permeability coefficient to the water permeability coefficient） and depths. 展开更多
关键词 semi-analytical solution unsaturated soil one-dimensional （1D） consoli-dation semi-permeable drainage boundary Laplace transform
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General semi-analytical solutions to one-dimensional consolidation for unsaturated soils 认领 引用 被引量：5
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作者 Lei WANG De'an SUN Aifang QIN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2017年第6期831-850,共20页
This paper presents general semi-analytical solutions to Fredlund and Hasan＇s one-dimensional （1D） consolidation equations for unsaturated soils subject to different initial conditions, homogeneous boundaries and t... This paper presents general semi-analytical solutions to Fredlund and Hasan＇s one-dimensional （1D） consolidation equations for unsaturated soils subject to different initial conditions, homogeneous boundaries and time-dependent loadings. Two variables are introduced to transform the two-coupled governing equations of pore-water and poreair pressures into an equivalent set of partial differential equations （PDEs）, which are solved with the Laplace transform method. The pore-water and pore-air pressures and settlement are obtained in the Laplace transform domMn. The Crump＇s method is used to perform inverse Laplace transform to obtain the solutions in the time domain. The present solutions are more general in practical applications and show good agreement with the previous solutions in the literature. 展开更多
关键词 semi-analytical solution unsaturated soil one-dimensional consolidation,homogeneous boundary condition time-dependent loading
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Semi-analytical solution to one-dimensional consolidation in unsaturated soils 认领 引用 被引量：3
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作者 秦爱芳 孙德安 谈永卫 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2010年第2期215-226,共12页
In this paper, a series of semi-analytical solutions to one-dimensional consolidation in unsaturated soils are obtained. The air governing equation by Fredlund for unsaturated soils consolidation is simplified. By app... In this paper, a series of semi-analytical solutions to one-dimensional consolidation in unsaturated soils are obtained. The air governing equation by Fredlund for unsaturated soils consolidation is simplified. By applying the Laplace transform and the Cayley-Hamilton theorem to the simplified governing equations of water and air, Darcy＇s law, and Fick＇s law, the transfer function between the state vectors at top and at any depth is then constructed. Finally, by the boundary conditions, the excess pore-water pressure, the excess pore-air pressure, and the soil settlement are obtained under several kinds of boundary conditions with the large-area uniform instantaneous loading. By the Crump method, the inverse Laplace transform is performed, and the semi-analytical solutions to the excess pore-water pressure, the excess pore-air pressure, and the soils settlement are obtained in the time domain. In the case of one surface which is permeable to air and water, comparisons between the semi-analytical solutions and the analytical solutions indicate that the semi-analytical solutions are correct. In the case of one surface which is permeable to air but impermeable to water, comparisons between the semi-analytical solutions and the results of the finite difference method are made, indicating that the semi-analytical solution is also correct. 展开更多
关键词 one-dimensional consolidation unsaturated soils excess pore-water pres-sure excess pore-air pressure semi-analytical solution
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Fractional Analysis of Dynamical Novel COVID-19 by Semi-Analytical Technique 认领 引用 被引量：2
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作者 S.Iqbal D.Baleanu +2 位作者 Javaid Ali H.M.Younas M.B.Riaz 《Computer Modeling in Engineering & Sciences》 SCIE EI 2021年第11期705-727,共23页
This study employs a semi-analytical approach,called Optimal Homotopy Asymptotic Method(OHAM),to analyze a coronavirus(COVID-19)transmission model of fractional order.The proposed method employs Caputo’s fractional d... This study employs a semi-analytical approach,called Optimal Homotopy Asymptotic Method(OHAM),to analyze a coronavirus(COVID-19)transmission model of fractional order.The proposed method employs Caputo’s fractional derivatives and Reimann-Liouville fractional integral sense to solve the underlying model.To the best of our knowledge,this work presents the first application of an optimal homotopy asymptotic scheme for better estimation of the future dynamics of the COVID-19 pandemic.Our proposed fractional-order scheme for the parameterized model is based on the available number of infected cases from January 21 to January 28,2020,in Wuhan City of China.For the considered real-time data,the basic reproduction number is R0≈2.48293 that is quite high.The proposed fractional-order scheme for solving the COVID-19 fractional-order model possesses some salient features like producing closed-form semi-analytical solutions,fast convergence and non-dependence on the discretization of the domain.Several graphical presentations have demonstrated the dynamical behaviors of subpopulations involved in the underlying fractional COVID-19 model.The successful application of the scheme presented in this work reveals new horizons of its application to several other fractional-order epidemiological models. 展开更多
关键词 Novel COVID-19 semi-analytical scheme fractional analysis
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Hamiltonian parametric element and semi-analytical solution for smart laminated plates 认领 引用 被引量：2
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作者 卿光辉 邱家俊 刘艳红 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第1期51-58,共8页
Based on the Hellinger-Reissner （H-R） mixed variational principle for piezoelectric material, a unified 4-node Hamiltonian isoparametric element of anisotropy piezoelectric material is established. A new semi-analyt... Based on the Hellinger-Reissner （H-R） mixed variational principle for piezoelectric material, a unified 4-node Hamiltonian isoparametric element of anisotropy piezoelectric material is established. A new semi-analytical solution for the natural vibration of smart laminated plates and the transient response of the laminated cantilever with piezoelectric patch is presented. The major steps of mathematical model are as follows： the piezoelectric layer and host layer of laminated plate are considered as unattached three-dimensional bodies and discretized by the Hamiltonian isoparametric elements. The control equation of whole structure is derived by considering the compatibility of generalized displacements and generalized stresses on the interface between layers. There is no restriction for the side-face geometrical boundaries, the thickness and the number of layers of plate by the use of the present isoparametric element. Present method has wide application area. 展开更多
关键词 piezoelectric material smart laminated plate vibration analysis Hamilto-nian isoparametric element semi-analytical solution
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Semi-analytical Monte Carlo simulation of laser-induced fluorescence propagation in an optically participating spray 认领 引用 被引量：1
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作者 CHEN Ling-hong ROZE Claude +3 位作者 GARO Annie GIRASOLE Thierry CEN Ke-fa GREHAN Gérard 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2007年第7期1170-1178,共9页
A semi-analytical Monte Carlo (SMC) simulation was developed to simulate the propagation of laser-induced fluo- rescence (LIF) in an optically participating spray, which simultaneously exhibits spectrally dependent em... A semi-analytical Monte Carlo (SMC) simulation was developed to simulate the propagation of laser-induced fluo- rescence (LIF) in an optically participating spray, which simultaneously exhibits spectrally dependent emission, anisotropic scattering, absorption, and re-emission. The SMC simulation is described and then applied to an experimental configuration of a cloud of polydisperse droplets composed of water and sulforhodamine B dye. In the SMC simulation, the collected LIF flux on the remote receptor element is calculated as the global contribution from the emissive source, single, twice, … and nth collision events in any sequence. The effects on the fluorescence photons propagation of spray parameters like the dye concentration, droplets concentration, and droplets size are examined. Three spectral bands representing different optical properties are chosen to analyze the interference of absorption, scattering and re-emission on the detected LIF flux. The obtained spectral LIF flux distribution on the receptor demonstrates a “red shift” phenomenon. 展开更多
关键词 Laser-induced fluorescence （LIF） Semi-analytical Monte Carlo （SMC） simulation Absorption Anisotropic scattering Re-emission Spray
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Construction of Crack Perturbation Model and Forward Semi-analytical Model of Attached Eddy Current Sensor 认领 引用 被引量：1
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作者 焦胜博 程礼 +2 位作者 李晓微 李培源 高君宇 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2015年第3期279-288,共10页
Fatigue damage monitoring is critical metallic structure health monitoring of aircraft.The sensor should be high sensitive,easy to be integrated into structure and well adaptable for poor working conditions.Therefore,... Fatigue damage monitoring is critical metallic structure health monitoring of aircraft.The sensor should be high sensitive,easy to be integrated into structure and well adaptable for poor working conditions.Therefore,an attached eddy current sensor with flexible plane is put forward and its characteristics are analyzed.By extracting material′s conductivity as the crack features,forward semi-analytical model is established and parameter optimizations are carried out.Crack perturbation model of attached eddy current sensor is constructed,and perturbation voltages of sensing channels under three-dimension structural crack are obtained.To verify the sensor′s performance,monitoring experiment on crack extension is conducted under condition of 3 MHz frequency.The validation experimental results show that perturbation model of 2A12-T4 aluminum alloy agrees well with experiment results,and perturbation model errors of four sensing channels are within 25%.The attached eddy current sensor is capable of testing the crack nondestructively and measuring the crack extension quantitatively with the accuracy of 1mm. 展开更多
关键词 attached eddy current sensor semi-analytical model
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Stress analysis of anisotropic thick laminates in cylindrical bending using a semi-analytical approach 认领 引用 被引量：3
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作者 LU Chao-feng LIM C.W. XU Feng 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2007年第11期1740-1745,共6页
Semi-analytical elasticity solutions for bending of angle-ply laminates in cylindrical bending are presented using the state-space-based differential quadrature method (SSDQM). Partial differential state equation is d... Semi-analytical elasticity solutions for bending of angle-ply laminates in cylindrical bending are presented using the state-space-based differential quadrature method (SSDQM). Partial differential state equation is derived from the basic equations of elasticity based on the state space concept. Then, the differential quadrature (DQ) technique is introduced to discretize the longitu- dinal domain of the plate so that a series of ordinary differential state equations are obtained at the discrete points. Meanwhile, the edge constrained conditions are handled directly using the stress and displacement components without the Saint-Venant principle. The thickness domain is solved analytically based on the state space formalism along with the continuity conditions at interfaces. The present method is validated by comparing the results to the exact solutions of Pagano’s problem. Numerical results for fully clamped thick laminates are presented, and the influences of ply angle on stress distributions are discussed. 展开更多
关键词 Semi-analytical elasticity solution State-space-based differential quadrature method （SSDQM） Angle-ply laminates Cylindrical bending
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A NOVEL SEMI-ANALYTICAL METHOD FOR SOLVING ACOUSTIC RADIATION FROM LONGITUDINALLY STIFFENED INFINITE NON-CIRCULAR CYLINDRICAL SHELLS IN WATER 认领 引用 被引量：3
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作者 XiangYu HuangYuying 《Acta Mechanica Solida Sinica》 SCIE EI 2005年第1期1-12,共12页
Based on the extended homogeneous capacity high precision integration method and the spectrum method of virtual boundary with a complex radius vector, a novel semi-analytical method, which has satisfactory computation... Based on the extended homogeneous capacity high precision integration method and the spectrum method of virtual boundary with a complex radius vector, a novel semi-analytical method, which has satisfactory computation efectiveness and precision, is presented for solving the acoustic radiation from a submerged infnite non-circular cylindrical shell stifened by longitudinal ribs by means of the Fourier integral transformation and stationary phase method. In this work, besides the normal interacting force, which is commonly adopted by some researchers, the other interacting forces and moments between the longitudinal ribs and the non-circular cylindrical shell are considered at the same time. The efects of the number and the size of the cross-section of longitudinal ribs on the characteristics of acoustic radiation are investigated. Numerical results show that the method proposed is more efcient than the existing mixed FE-BE method. 展开更多
关键词 sound-structure interaction stifened non-circular cylindrical shell vibration and acoustic radiation semi-analytical method transfer matrix method
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Semi-analytical finite element method applied for characterizing micropolar fibrous composites 认领 引用 被引量：1
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作者 J.A.OTERO Y.ESPINOSA-ALMEYDA +1 位作者 R.RODRIGUEZ-RAMOS J.MERODIO 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第12期2147-2164,共18页
A semi-analytical finite element method(SAFEM),based on the two-scale asymptotic homogenization method(AHM)and the finite element method(FEM),is implemented to obtain the effective properties of two-phase fiber-reinfo... A semi-analytical finite element method(SAFEM),based on the two-scale asymptotic homogenization method(AHM)and the finite element method(FEM),is implemented to obtain the effective properties of two-phase fiber-reinforced composites(FRCs).The fibers are periodically distributed and unidirectionally aligned in a homogeneous matrix.This framework addresses the static linear elastic micropolar problem through partial differential equations,subject to boundary conditions and perfect interface contact conditions.The mathematical formulation of the local problems and the effective coefficients are presented by the AHM.The local problems obtained from the AHM are solved by the FEM,which is denoted as the SAFEM.The numerical results are provided,and the accuracy of the solutions is analyzed,indicating that the formulas and results obtained with the SAFEM may serve as the reference points for validating the outcomes of experimental and numerical computations. 展开更多
关键词 semi-analytical approach fiber-reinforced composite(FRC) effective property finite element method(FEM) asymptotic homogenization method(AHM) micropolar elasticity
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A SEMI-ANALYTICAL AND SEMI-NUMERICAL METHOD FOR SOLVING 2-D SOUND-STRUCTURE INTERACTION PROBLEMS 认领 引用 被引量：9
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作者 Xiang Yu Huang Yuying 《Acta Mechanica Solida Sinica》 SCIE 2003年第2期116-126,共11页
Based on the transfer matrix method and the virtual source simulation technique, this paper proposes a novel semi-analytical and semi-numerical method for solving 2-D sound- structure interaction problems under a harm... Based on the transfer matrix method and the virtual source simulation technique, this paper proposes a novel semi-analytical and semi-numerical method for solving 2-D sound- structure interaction problems under a harmonic excitation.Within any integration segment, as long as its length is small enough,along the circumferential curvilinear coordinate,the non- homogeneous matrix differential equation of an elastic ring of complex geometrical shape can be rewritten in terms of the homogeneous one by the method of extended homogeneous capacity proposed in this paper.For the exterior fluid domain,the multi-circular virtual source simulation technique is adopted.The source density distributed on each virtual circular curve may be ex- panded as the Fourier's series.Combining with the inverse fast Fourier transformation,a higher accuracy and efficiency method for solving 2-D exterior Helmholtz's problems is presented in this paper.In the aspect of solution to the coupling equations,the state vectors of elastic ring induced by the given harmonic excitation and generalized forces of coefficients of the Fourier series can be obtained respectively by using a high precision integration scheme combined with the method of extended homogeneous capacity put forward in this paper.According to the superposition princi- ple and compatibility conditions at the interface between the elastic ring and fluid,the algebraic equation of system can be directly constructed by using the least square approximation.Examples of acoustic radiation from two typical fluid-loaded elastic rings under a harmonic concentrated force are presented.Numerical results show that the method proposed is more efficient than the mixed FE-BE method in common use. 展开更多
关键词 sound-structure interaction acoustic radiatlon multi-circular virtual source simulation technique transfer matrix method inverse fast Fourier transformation semi-analytical and semi-numerical method
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