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Characteristics of hemispherical dielectric resonator antenna (DRA) mounted on or embedded in spherical ground plane are discussed in this paper. Curvature effects on radiation characteristics of hemispherical DRA are evaluated using the finite element method and the finite integration technique. The co-polarization and the cross-polarization characteristics are analyzed. The structure of a superstrate-loaded...
The objective of this paper is to study the radiation performance of mobile handsets antenna by using the hybrid method between the Finite-Element Method (FEM) and the Finite Difference Time Domain (FDTD), as applied to computational electromagnetic studies, e.g. antenna scattering modelling problems. An application of modified equivalent surface boundary using the hybrid FEM-FDTD technique is presented...
Based on the basic theory of soil nonlinear numerical simulation, developing a suitable Macro documents for large-scale calculation software ANSYS and taking measures that the parameter Et of Duncan-zhang nonlinear constitutive model was modified under the gradual load, a method about the modification of the nonlinear constitutive model of soil and the characteristics analysis of soil layer were established...
Bearing capacity of concrete-filled steel tubular (CFT) column under axial loading is studied by ANSYS procedures. Firstly, ultimately bearing capacity of CFT column is calculated using model of solid element. In order to expedite computed speed, model of beam-link element is proposed. Then the load-bearing capacity obtained from model of solid element and the model of beam-link element is well consistent...
Adopting Hardening-Soil finite element model based on unloading ,the improvement of grouting strengthening rear soil on deformation of the pit is studied. The results show that the reinforce influence on lateral deformation increases with the increasing of the excavating depth, the final lateral deformation reduces 13.6% than without reinforce, the displacement of pile top reduces 40.66%, but the...
Based on ABAQUS modeling platform, simplified modeling of pipeline interface in different directions of water supply network in KGWL zone was conducted, where finite element analysis was as the basic modeling approach. Then dynamic analysis was taken when a known seismic/earthquake wave was input. Through analysis of simulation results, the basis of earthquake damage on pipe interface was determined...
Since the design of integral abutment bridge are basically depended on experience. In this paper, the three dimensional FEM model of integral abutment bridge is presented. The effect on the loaded property and thermal deformation of integral abutment bridge with the interaction between Pile and soil are analyzed under temperature load, Then compared with those joint bridges. Some reference conclusion...
Underground Culvert construction always adjacent to existing pile foundation, it is an important problem how to ensure the security of the existing pile. Taking the Underground Culvert at West Ring Road of the South-North Water Transfer Project as an example, the 3D numerical simulation had been carried out and the stress deformation Law and the stability of the pile was studied. The results had shown...
Compatible finite elements for soil, pile, foundation and superstructure are reasonably selected, viscous-spring artificial boundary is adopted to simulate soil boundary effect. The finite element model of soil-pile-superstructure coupling system is established; characteristics of vibration responses of frame superstructure under different seismic excitation are studied, and seismic responses obtained...
A 3D finite element model of a prestressed concrete composite box girder with waveform steel webs is established by means of the composite element method. The influence about geometric parameters of waveform steel webs is analyzed by used linear and nonlinear finite element calculation of steel box girder. It shows that bending stress and warping stress was reduced by increasing the bending angle...
A building was designedly blasted to partly ruined one to model a seismic damaged structure in the earthquake ruins training field of the National Training Base of Emergency Seismic Rescue. The structure design method of this case is discussed here, including the earthquake load design level, two separate models in PKPM, and the intended weak section design for the blasting to control the ruin shape...
Ceramics have some outstanding features needed for pressure-tight housings of underwater devices such as higher compressive strength, lower specific gravity and high resistance against corrosion. One of promising applications is pressure-tight housings for free-fall pop-up Ocean-Bottom Seismometer (OBS) because we can develop light and hard pressure-tight housings using made of ceramics, which have...
Room impulse response and the acoustical parameters of an actual room were calculated with acoustics finite element method using Comsol Multiphysics software. The procedure of calculating room impulse response and acoustic parameters were introduced. The calculated acoustics parameters up to octave bands of 500Hz were then compared with the field measured results. The FEM is proved to be a useful...
Polymer electrolyte membrane fuel cell (PEMFC) has been widely considered as one of the most promising clean energy power sources, especially for portable electronic products, small fixed station and automobiles, because of its high power density, capability of quick start-up, and advantages of clean and quiet operation. In this paper, the test system was established to investigate the performance...
A novel numerical approach, which combines component modal synthesis method with recursive stochastic finite element method (RSFEM), is employed to study eigenvalue problems of large random structures. This method is called as substructure recursive stochastic finite element method (SRSFEM) in this paper. Different from traditional the first or second order of perturbation stochastic substructure...
The size effect in the load test of composite foundation is studied through FEM analysis in the paper. From the result of study, we can see that the testing result on four piles area is closed to the result with the group piles effect in large-area composite foundation; In engineering, if the bearing capacity of the testing result from single or double pile composite foundation is used in large area...
Large air cooling fan system is made up of many fans. The dynamic response of the fan bridge truss is very complicated when the fans are running simultaneously. Four fans and their supporting structures are selected from the fan system as analysis object. By finite element method, vibration response produced by 15 kinds of the combinations of running of fans is analyzed. Result shows that interaction...
The seismic analysis of underground structures is relatively complex, and there is no unified point of view. In this paper, we analysis the dynamic response characteristics of the Dakai subway station by the horizontal seismic loads in ANSYS, and take into account the three artificial boundary conditions: fixed boundary, viscous boundary and visco-elastic boundary. The results show that the stress...
Considering soil structure interaction, research on the finite modeling with the settlement of high-rise structure, determined the extent of soil, and use SAP2000 to calculate the settlement of a tall building, settlement discipline of a structure and main factors are obtained, provided a useful reference for the design.
In order to analyze stress of the part in service, a flow for stress analysis of the part in service is proposed based on industrial computed tomography(CT). Firstly, the part in service was scanned to get CT image which was processed to extract the edge by Canny method. Then the edge was transformed into vector graph. Finally, the vector graph was analyzed by finite element method based on simulating...
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