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A hybrid boundary element model is proposed for the simulation of large piezoelectric micromachined ultrasonic transducer (PMUT) arrays in immersion. Multiphysics finite element method (FEM) simulation of a single-membrane structure is used to determine stiffness and piezoelectrically induced actuation loading of the membranes. To simulate the arrays of membranes in immersion, a boundary element method...
This current paper is a continuation of authors' previous paper [1] in which they began to bond induction machines' (IMs) vector diagrams with Finite element method (FEM). Today, as a numerical method, FEM is widely used for magnetic field calculations due to its accuracy and fast experimental prototype modeling. The goal of this paper is to theoretically introduce readers with a new methodology for...
A Model dedicated to EMI prediction in a DC-DC converter is presented in this paper. The model is analytical to be used by a deterministic optimization algorithm. This model not only predicts EMI but also thermal effects of the converter. Numerical and experimental validation of the model are performed regarding EMC aspects and perspectives for the final optimization purpose are presented.
Atmospheric icing is one of the main threats to overhead transmission lines in cold regions. The ice related loads may cause mechanical incidents, such as wire breakage, cable rupture, clamp slipping, cross-arm deformation and even tower collapse. Ice shedding may lead to dramatic vibration of lines and cause flashover or short circuit among ground wires, conductors and the earth. Therefore, to obtain...
A novel parametric model of the stiifened shell is developed by Python language with Abaqus in this paper. As an effective analysis method in the optimal design, explicit finite element method (FEM) is used to design and optimize the skin thickness and stiffener size of Stiffened Shells. The optimization objectives and constraints are mainly the minimum mass subject to the structural performance and...
A model/sensor hybrid approach is implemented to conduct failure prognostics of an automotive electronic control unit (ECU). A 3-D finite element model simulating a complex ECU is built, and its predictability is calibrated and verified by an optical displacement measurement technique called moiré interferometry. The stress states of the ECUs during thermal cyclic loadings are documented by piezoresistive-based...
In the present article, the authors are performing a comparison study between two vortex models for the rapid numerical computation of the static thrust of a helicopter rotor in hover. The aim of this study is to access the rapidity and accuracy of a vortex model, comprised of a series of vortex rings and a single semi-infinite vortex cylinder, compared to a helical wake model with straight-line segmentation...
Modeling the nonlinear behavior of concrete within the problems of continuum mechanics for designing protective and military structures is now undoubtedly the subject of effort of staff of many scientific institutes. Striving for modeling real nonlinear behavior of concrete through sophisticated material models implemented in an even more sophisticated computing systems based mainly on the finite...
The lift tab/ramp interface in a hard-disk drive is investigated during load/unload. The von Mises stress on the ramp and the lift tab is determined as a function of the ramp profile, the friction coefficient, and the lateral motion of the lift tab. A step function like stress increase was observed, where the slope of the ramp changes discontinuously. A large reduction in stress can be obtained if...
Realistic material modelling is at the heart of accurate reliability prognosis of electronics hardware by means of Finite Element (FE) calculations. It is usually achieved on the basis of material testing using standardized samples, where well defined, homogeneous stress states and loading conditions can be realized. Both the deformation behaviour in the initial state, as well as the materials degradation...
This paper presents results of numerical and experimental examination of thin-walled structures which model certain parts of aircraft structures subject to bending and torsion. The considered type of load and deformation corresponds to the state of such structures typical for in-flight conditions. A physical model of the analysed structure in several versions with and without stiffeners was made of...
Epoxy based polymers are widely used in the semiconductorindustry as thermal or/and electrical interfaces and as encapsulating material. In the automotive industry epoxy molding compounds are often used to protect not only singleIC packages but also the entire electronic control units (ECUs) or power modules. Fracture processes in mold materials used for the encapsulation of electro mechanical components...
An experimental and numerical study of electrical contact for low currents in sphere-plane set-up is presented. A three-level multi-scale model is proposed. We use the finite element analysis for macroscopic mechanical and electric simulations. It takes into account the setup geometry, elasto-plastic mechanical behavior of contacting components in the finite-strain-plasticity framework and electrostatic...
This paper presents numerical modeling and prediction of delamination propagation in thin-walled structure under quasistatic loading realized at software ANSYS®. Approach to delamination process based on cohesive zone model (CZM) and interacting of two shell-layers is utilized.
Behavior of the peri-implant tissue following a dental implant surgery is simulated. The cascade of tissue responses starting with healing, followed by remodeling are investigated. Although different implant designs, implant widths and amounts of micro-motion during the healing period were all shown to have important effects on the long-term status of the surrounding region; the amount of micro-motion...
14.5 AP Ballistic impact on armor steel was simulated to investigate the effect of material and obliquity on ballistic resistance performance. The research was conducted with explicit dynamic code and AUTODYN on ANSYS commercial software. The result revealed that single layer of 10 mm V250 steel could not defeat 14.5 mm AP bullet. The second layer of alumina ceramic on V250 steel can increase ballistic...
This article uses finite element ABAQUS to set up the 3-dimensional finite element model of the dynamic tri-axial specimen, simulate the dynamical deformation behavior of the stabilized-soil under cyclic load. The main focuses on the freezing temperature of the strengthen soil of the plastic deformation. Meanwhile, the influence to the strengthen soil dynamical characteristic such as cyclic load's...
From highway sub grade, this paper takes the dynamic finite element simulation method to simulate dynamic response of saturated silt roadbed under typical working conditions, takes analysis of the relationship between additional dynamic stress of sub grade and its liquefaction resistance, the ratio relationship between additional dynamic stress and its original effect, and influence of various main...
Skin is a multi-layered and complex biological structure, which makes the largest mammalian organ. Its biomechanical behaviour is important in many applications either in medical or engineering field. This sudy aims to simulate human skin deformation based on the information and comparing the biomechanical parameter with experimental procedure developed earlier. The experimental protocol to measure...
Beam elements have played a very important role in modeling mechanical engineering structures. Curved beams are known to be more efficient in transfer of loads than straight beams. The transfer in the curved beam is affected by means of bending, shear and membrane action. This is particularly important in studying initially curved beams. The aim of this project is to improve the use and flexibility...
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