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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...
The article discusses current issues related to the development and application of virtual simulation to ensure the reliability of the electronic equipment in the presence of vibrations on the on-board equipment of the object of its installation. The authors constructed an algorithm of the method of ensuring vibration reliability of developed structures of electronic equipment in the process of virtual...
Finite Element simulations are often used to study the reliability of solder joints subjected to thermal cycling. Packaging configurations are becoming more complex to accommodate better functionality and performance. Increased complexity leads to several challenges for FE models including difficulties modeling thin layers and interfaces, as well as keeping the total numbers of nodes and elements...
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...
Nowadays the comfort in passenger transport system is very relevant. One source of noise and vibration is the torque ripple. Torque ripple can be generated by an inappropriate machine control tuning and by the inherent torque ripple of the machine. In permanent magnet machines, the inherent torque ripple is composed by three components: electromagnetic torque, reluctant torque, caused by the winding...
The results of strength and gas dynamic improvement of turbocharger TK-32 axial turbine are presented. Turbocharger is manufactured by LLC "Penzadieselmash" (Penza, Russian) and used as unit boost for diesel locomotive. The aim of this work was to ensure turbine work capacity when rotor speed is increased by 10% without efficiency reduction. The strain-stress state analysis indicated the...
In this paper we present the parameterized model of MEMS condenser microphone built in Comsol Multiphysics environment. It is based on coupled electromechanic FEM simulation with help of analytical modelling. The model uses set of parameters that describes the structure dimensions and applied loads. The user attention is needed only for putting those parameters and choosing the desired types of simulation...
The capability and the range of functions of electronic devices have strongly developed over the last decade, while their size has significantly decreased. At the same time highlevel product reliability has become a vital requirement. However, for the backbone of the electronic devices, the printed circuit boards (PCBs) miniaturization often entails negative mechanical effects, such as local stress...
An approach based on the hybridization of 3D finite element method and permeance networks is developed and applied for the modeling of a claw-pole synchronous machine. This model avoids the difficulties due to the movement and the complex geometry of the rotor and reduces the CPU time. A good agreement with experiments and full 3D models is obtained.
Thermal circuit models are based on the analogy between heat transfer and current flow equations. A thermal circuit model is extracted from a solid model of the package assembly by means of a mathematical model order reduction (MOR) algorithm. This algorithm automatically generates a SPICE netlist that can be used with standard analog circuit simulator, for simulation of transient operating conditions...
Objective: Biomechanical modeling is an important tool in that it can provide estimates of forces that cannot easily be measured (e.g., soft tissue loads). The goal of this study was to develop a discrete element model of the knee that is open source to allow for utilization of modeling by a wider audience of researchers. Methods: A six degree-of-freedom tibiofemoral and one degree-of-freedom patellofemoral...
We report on the development of a multi-axis force/torque sensor that is also a motor bracket, mounting between the motor and the frame. The shape of the bracket was designed to be sensitive to the two-axis forces and one-axis motor torque applied in the plane perpendicular to the direction of the motor shaft. By using four strain gauges, the described force/torque can be reconstructed. The relation...
In the electronic industry the portable devices are becoming the prime factors to dominate the market share. And with the blessing of miniaturization, these devices are also becoming smaller and smaller day by day. On the other hand, with this miniaturization process these devices are becoming more susceptible to drop impact loading. To ensure product quality and to integrate more complicated functionality...
The calculation of an axle-box with the VBP-15 bearing has been made. The contact pressure distribution for bearing parts in case of radial and axial forces application to an axle-box have been received. The optimization of a bearing roller form for maintaining a steady contact pressure along its length has been fulfilled.
This paper employs a method of measuring the relation between eject pin and UV tape which could cause chip damage during the die bond process. According to the enhancement of LCD technique, lighter, thinner, shorter and smaller has become a sign for the device. Compared with the traditional package, driver IC needs to be designed as a slender shape because of the finite placing space. During die pick...
The behavioral modeling reported in this work is computationally efficient for use in modeling distributed currents and potentials throughout the open-form conductor that is the ship's structure. Physics-based modeling is used to form a multiport S-parameter behavioral model of the ship's structure that is compatible with S-parameter models of parasitic paths to grounded equipment enclosures and cables...
The rapid increase of embedded systems design complexity has resulted in emergence of design methodologies at higher levels of abstraction such as Electronic System Level (ESL) and Transaction Level Modeling (TLM) with SystemC language as the main instrument. In practice, system architects and system integrators often have access to a library of legacy Register Transfer Level (RTL) IP (Intellectual...
This paper deals with a simulation modelling of a thermoelectric energy harvester for aircraft applications. The aim of this paper is to provide overview of simulation modelling methods, which are used in development process of the autonomic thermoelectric energy harvester. The assumed harvester is based on MEMS technology and is capable to operate as an independent energy source under high range...
The effects of the numerical parameters used in bone fracture healing simulations are investigated systematically. It was determined that use of a relaxation method to smooth out the transient evolution of the materials properties allows a faster convergence as compared to the averaging method. It was also concluded that stepped application of the external force or displacement leads to non-smooth...
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