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Meshfree Methods (MMs) have become popular as an alternative numerical simulation technique to handle problems of diverse engineering fields where conventional grid based methods are not suitable. Element Free Galerkin (EFG) method is a popular meshfree approach based on global weak form of governing differential equation and employs Moving Least Square (MLS) approximants to construct shape functions...
Rotating systems components such as rotors, have dynamic characteristics which are of great importance to understand because they may cause failure of turbomachinery. Therefore, it is required to study a dynamic model to predict some vibration characteristics, in this case, the natural frequencies and mode shapes (both of free vibration) of a turbocompressor shaft by using the finite element analysis...
In this paper, a unique approach to the analysis of an elementary dipole using finite element method (FEM) is presented in a step by step manner. This approach is also extended to a linear dipole array accommodating array factor method. The approach considered here is based on solution of partial differential equations using FEM. Near field and far field pattern of a single dipole element and a linear...
This paper deals with the electric field optimization on the spacer of 150 kV Gas Insulated Substation (GIS) using Functionally Gradient Material (FGM). The basic spacer model is made from epoxy resin with permittivity equals 3.5. The dimension of basic spacer and spacer with FGM modification is same. FGM is done by composing 90% of spacer with epoxy resin and 10% of spacer with higher permittivity...
A new classification of finite elements is proposed, called the digital nomenclature code dncm. The topological and kinematic structure of an arbitrary finite element is represented by a multi-digit code that reflects the topological structure of the element. The code of an element is based on dimension d, the number of nodes n, the number of scalar coordinates per node c, and a multiplier m. The...
Diaphragm Chamber is a critical component in fluid end of large scale diaphragm pump. Static strength failure and fatigue failure of diaphragm chamber are caused by high pressure of slurry flowing which is transported by diaphragm pump. It is necessary to analyze the inferences of different boundary shapes of diaphragm chamber on its static strength. In this paper, diaphragm chamber was simulated...
This study presents a simple type of modified PCF (M-PCF) as a chemical sensor where both core and cladding are micro-structured. Different guiding properties of proposed M-PCF have been investigated for a wide range of wavelength using full vectorial finite element method (FEM). By varying pitch and hole diameter both of inner and outer layers, the relative sensitivity, refractive index and confinement...
We present an inverse algorithm based on Level Set method and topological shape gradient for optimizing the shape of planar antenna structure or arrays from imposed constraints (e.g. desired or imposed radiation patterns, gain or directivity) or for reconstructing the shape from measurements. The forward problem is solved using an integral formulation of the EM problem with finite element discretization...
This paper deals with a short overview of the problem of shape optimization of elastic bodies of mechanical structures of VAP, the ontology of problems and methods of optimizing the shape of elastic body in terms of buckling load with an emphasis on algebraic methods. Elements of the ontology of interval analysis for calculating tolerances are also given.
A new algorithm is proposed by the cubic spline to describe the shape of the domain in an arterial graft design problem, which is mathematically modeled with a flow-based shape optimization. The optimization method based on the coefficients of the spline is then studied, where a mixed finite element formulation is used for the flow problem and the moving mesh technique is adopted to track the optimized...
This paper presents an optimal design of interior permanent magnet synchronous machine (IPMSM) for electric spindle considering the flux-barrier shape. Four types of flux-barrier are discussed and compared to improve torque performance, which includes the average torque, torque ripple and cogging torque. The design process is accomplished by using finite element method (FEM). Moreover, the Taguchi...
This study aims at minimizing the acoustic noise from a magnetic origin of a claw-pole alternator. This optimization is carried out through a multiphysic simulation which includes the computation of magnetic forces, vibrations and the resulting noise. Therefore, a mechanical model of the alternator has to be developed to determine its main modes. Predicted modal parameters are checked against experimental...
We present an inverse algorithm based on Level Set method for optimizing the shape of planar antenna structure or arrays from imposed constraints (e.g. desired or imposed radiation patterns, gain or directivity) or for reconstructing it from measurements. The forward problem is solved using an integral formulation of the EM problem with finite element discretization. The shape gradient is computed...
When cells are exposed to very short and high strength electric pulses, they will deform from spherical shape to ellipsoidal shape, and these effects may occur on cellular and organelles. Because of their potential clinical applications, selective effects on organelles are of particular interest. In this work, we use the finite element method to investigate the influence of nanosecond pulsed field...
An approach to IC SEE sensitivity parameters estimation based on charge collection by a point node is discussed. SEE sensitivity dependences on incident angle, ion ranges and IC finite sizes are considered.
The reefing line control design of parachute is very important to the safety of decelerator. In this paper, a Fluid structure interaction method is proposed to analyse the very flexible parachute reefing force. With the proposed method, the parachute opening shock can be assessed with a given reefing line length and cutting line time. In addition, through this method the cutting line time can be studied...
Whether low or high temperature brazing seal structure, the solder joint shapes are important concern for the residual stress distributions. Many investigations of the residual stress distributions with the ideal solder joint shape in the brazing seal so far have been carried out theoretically and experimentally, whereas ones of the residual stress distributions with actual solder joint shape in these...
In this paper, a finite element modeling is coupled with several optimization techniques for the advanced design of microwave components. The techniques are applied to the design of a microstrip resonator in order to optimize its stop-band behavior. The optimized resonator is then employed for the realization of a 5-pole filter showing improved stop-band performances compared to a standard design...
We present different ultrawideband (UWB) multilayer printed arrays with large scanning capability and very low-profile. For each of them, both dielectric arrangement (relative permittivity and thickness of each dielectric layer) and radiating element shape have been simultaneously optimized to reach the best results in terms of bandwidth, scan range, and thickness. Single- and dual-polarized arrays...
This paper presents how a Lead Magnesium Niobate - Lead Titanate (PMN-PT) based actuator, poled and cut along the [001] crystalline direction, can be used as an integrated actuator in a Micro Opto Electro Mechanical System (MOEMS). This cut was chosen as it has been proved to present piezoelectric coefficients that surpass 4500pm/V. This makes PMN-PT suitable for bulk usage. The actuator may be used...
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