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Traditionally, CMUTs are modelled using the isotropic plate equation and this leads to deviations between analytical calculations and FEM simulations. In this paper, the deflection profile and material parameters are calculated using the anisotropic plate equation. It is shown that the anisotropic calculations match perfectly with FEM while an isotropic approach causes up to 10% deviations in deflection...
Based on the Helmholtz equation, the wave functionsof three-phase-common-type tank GIS are solved. It is shown that, due to the existence of the structural misalignment, any single normal mode of a perfectcoaxial structure no longer simultaneously satisfies both the outer and inner boundary conditions;Through the finite element analysis (FFA), the electric field distribution of the partial discharge(PD)...
We evaluate the RF network scattering parameters (S-parameters) of the calibration standards for the coaxial transmission lines. Those standards include: single ended open/shorts, step discontinuities in inner/outer conductors, tapers, and mismatch airlines. We use either an analytical function when the geometry is simple, or finite elements analysis for the more elaborate geometry. Whenever possible,...
This paper presents the design process of a slotted TORUS axial-flux permanent-magnet motor suitable for direct drive of an electric vehicle through sizing equation and Finite Element Analysis. AFPM motor is a high torque density motor which can be easily and compactly mounted into the automobile's wheel fitting the rim perfectly. A double-sided slotted AFPM motor with 6 rotor poles for high torque...
In this paper an algorithm for non-linear magnetic analysis of surface-mounted permanent-magnet machines is presented. It is based on the equivalent magnetic circuit method and can be used as a useful design and computing tool. The duplication of an elementary cell of the machine allows building whatever typology of windings and ampere-turns distribution in a pole pair. The direct modification of...
This report proposes a calculation equation for wall thickness of ceramic arc tube through calculation and analysis to temperature field distribution of arc tube in working, vapor pressure of materials filled in arc tube. Meanwhile, report also compares advantage or disadvantage of cylinder and ellipsoid arc tube on the base of finite element analysis.
Switched reluctance machine (SRM) is an attractive candidate for traction applications owing to its simple structure, robustness to harsh operating conditions and wide extended speed constant power range. Conventional SRM has higher number of stator poles than the rotor poles. Configurations with higher number of rotor poles using the new pole design (PD) formula, takes SRM one step further in traction...
Based on 3D FEM electro-thermal simulations, we explore the thermal impact of source metallization ageing inducing a bonding wire lift off on a VDMOS device. This kind of failure is usually modeled by changing the geometry of the assembly, without considering the physical properties evolution of aged materials such as the source metallization. This work aims to highlight the importance of taking into...
Lateral spreading of liquefied ground due to strong earthquakes frequently causes serious damages to multi-piles foundations. The relative displacement of flowing liquefied soil to piles effects the lateral force on piles and the failure of piles. In this study, a 4-piles model in liquefiable soil with two kinds of local slopes is simulated numerically by the 3-D dynamics FE-FD coupled method, in...
Component modal Synthesis method used in natural characteristic analysis is introduced in this paper. The principle of component modal synthesis method is described. Based on this principle, the sub-structure of tracking frame of electro-optical theodolite is divided and FEM is set up. The natural frequency of tracking frame of electro-optical theodolite is calculated in the end. The results showed...
Curing effects and difference in thermal contraction of components cause residual stresses and warpage during encapsulation of electronic packages. Residual stresses combined with thermal and mechanical loads influence package reliability and performance and may eventually lead to product failure. Comprehensive material characterisation is needed in order to perform numerical simulations which take...
Structure damage modelling for the simulation of elastic wave propagation is essential for simulation-based testing of structural health monitoring (SHM) systems. Reflection, transmission and other complex phenomena related to elastic wave interaction with structure defects need to be reproduced by the simulation method to replace physical testing by numerical one and aid the design process of SHM...
Using semi-analytical finite element method, this paper solves the problem of ribbed cylindrical shell construction's stability with quadratic spline-beam element. Displacement model of quadratic spline-beam element is established, elastic stiffness matrix and geometric stiffness matrix of the element is deduced, and the stability of ribbed cylindrical shell construction is analysed. Analysis results...
The pulse-width modulated valve (PMV) plays an important role in the whole electro-hydraulic automatic control system. In this paper, the magnetic field of the axially symmetric plane model simplified of the PMV is simulated with the magnetic finite element, thus accurate results on the distribution of magnetic field and flux-line can be obtained, as well as variation of the magnetic force and inductance...
This paper presents the study of piezoelectric actuators. After the description of simulated actuators and simulation conditions, results will be discussed to define the best actuator design in terms of membrane displacement and compactness. The actuator behaviour under temperature variation is also checked.
A new damage index named smeared cracked model damage index (SCMDI) based on the mean curvature of beam-type structure in time domain to detect cracks is presented, which introduces the smeared cracked model in damage mechanics, is demonstrated to be more robust and high efficiency in crack detection using a numerical model. The discrete measured responses for specified time interval are used to obtain...
Methods of reduced order model are widely applied in reduction of degree of freedom of large finite element models, the static condensation method used for fast computation of natural frequencies and mode shapes exactly in low frequency. The improve reduce system (IRS) method produces a reduced model which more accurate estimated the modal model of the full system, Rayleigh Ritz vector is a most general...
In the two-dimensional geo-electric model, the tipper response of magnetotelluric(MT) depends on the numerical simulation TE mode. Firstly, the boundary value problem and variational problem were shown, and the finite element method was used for element subdivision, interpolation, integration and general synthesis. Secondly, the electric field value of each node was obtained through solving the complex...
The present paper reports the B-spline finite element method for the solution of advection-diffusion equation. The one dimensional time dependent ADV equation has been taken in to consideration with dirichlet boundary conditions. The main emphasis are given to the B-spline FEM for that some typical test examples are presented to demonstrate the performance of proposed scheme. Numerical results obtained...
In this paper the principle of stationary total potential energy in structural dynamics first presented by the author is thoroughly examined. It is clearly shown that when being used in conjunction with a new matrix assembly technique called the "set-in-right-position" rule also proposed by us, which is inherently different from the most widely used direct stiffness method, the proposed...
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