The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the design of a high-performance 14-pole, 12-slot interior permanent magnet synchronous machine with flux barriers inside the stator iron core and fractional-slot concentrated windings. This work focuses on electromagnetic, mechanical and thermal aspects of the machine design. The specific goal of this work was to design an electrical machine, which will have a small size, high...
This paper reviews different methods of thermal analysis, highlighting advantages, drawbacks, and limits. It represents the basics for both analytical methods and numerical ones; which the analytical method is discussed more in detail, including thermal coefficients relevant issues. Also, different applications are investigated, and related analytical and numerical techniques are represented. The...
Finite Element Analysis (FEA) has evolved over the years from a purely academic pursuit into everyday product development due to the evolution of the computation power and software developments. Engineering simulation technology allows now the detailed analyses of complex sub-systems in different configurations, combined with physical conditions that equipment faces in the real word. It is shown how...
This paper presents a transient thermal analysis using Finite Element Method (FEM) to model the heat input effect of the Gas Metal Arc Welding (GMAW) process in plates of Al-6061-T6 with 4.8 mm of thickness. To validate the numerical results, a set of experiments were developed measuring temperatures along a perpendicular line from the weld cord. A good agreement was found between numerical and experimental...
This paper reports the impact of ageing on the cohesive and adhesive strength of overmould materials used in electronic packages. For so-called harsh environment applications, the overmoulded package operates in an ambient at a continuous temperature of 175°C, or sometimes even 200°C. At these high temperatures, it can be expected that the overmould material and its interfaces degrade. In order to...
The Rankine microturbine is a microelectromechanical system being developed for generating mechanical and electrical power from waste heat, such as from automobile exhaust gases. The design of this device faces the difficult challenges of creating structures rotating at high-speeds (1 000 000 r/min), sustaining large internal pressures (3 MPa) and temperature gradients (100°C/mm), and machining millimeter-sized...
This paper presents thermo-mechanical investigation results of a reconfigurable wafer-scale integrated circuit, the WaferIC™, dedicated to electronic systems prototyping. The proposed approach carefully selects materials combined with an active cooling mechanism to avoid critical localized thermal peaks and associated large thermal stresses. The performance of the approach was evaluated and tested...
A two-die stacked silicon module with TSV has been developed in this work. Thermal-mechanical analysis has been performed and TSV interconnect design is optimized. Multiple chips representing different functional circuits are assembled using flip chip interconnection methods. Silicon carrier is fabricated using via-first approach, the burrier copper via is exposed by special backgrinding process....
Due to the high corrosion, high strength-to-weigh ratio and low thermal conductivity, the fiber reinforced polymer(FRP) materials are increasingly being used for the large diameter pipe, which is used to transport hot water. The temperature of the hot water is 45°C, and the ambient air temperature is 3°C in the extreme working conditions. So the strength analysis is necessary under thermal and internal...
The service life of hot forging die is mainly decided by Stresses, including thermal, mechanical and combined stress. Stress amplitude is affected by the material properties, such as specific heat capacity. The choice of die material is very importance for improving die service life. In order to identify the effect of specific heat capacity on die stress, a 2D FE model of cake shaped workpiece is...
Permanent magnet brushless DC motors used in aerospace generally have numerous qualities such as light weight, small size, and high efficiency. This means that the thermal design of those motors is very serious. In order to obtain an accurate thermal field simulation of a permanent magnet brushless DC motor, both electromagnetic and thermal fields have to be calculated in a coupled simulation. In...
Based on thermo-elastic finite element theory, the equivalent nodal thermal load is analyzed, and thermal load of each node load as a physical force is applied to the elastic field. The model of structural topology optimization of continuum structure considering thermo-mechanical coupling is established using the minimum strain energy as the goal. The solid isotropic material with penalization approach...
Stresses, including thermal, mechanical and combined stress, are the root causes leading to hot forging die failure. Stress amplitude is affected by the material properties, such as thermal expansion coefficient. In order to select die material for improving die service life, a 2D FE model is developed to analyze thermal, mechanical and combined stress of hot forging die with different level thermal...
When a place catches fire it is well observed fact that a large amount of time is wasted by the fire man to extinguish fire due to huge distance present between the place of the fire and the water hose or water monitor. Because of which large amount of water is wasted due to evaporation of water loss during jet impact. It is impossible to take water monitor close to fire because of high temperature...
In this paper, finite element method (FEM) numerical thermal simulation is performed on the given packaging configuration, and temperature as well as heat flux distribution are obtained. An optimal packaging configuration is obtained by simulating different materials and structures of the heat sink, submount, die attach, different die arrangement styles and die spacing parameters. A reasonable simplification...
Residual Ion Dump (RID) of the 100 kV negative hydrogen ion source based Diagnostic Neutral Beam (DNB) injector, utilizes electrostatic fields for the ion beam deflection. There are four channels formed by five panels of length 1000 mm. Each panel consists of 10 actively cooled elements called Tube Elements (TEs) made up of CuCrZr alloy. All TEs are of 1.5 m length with cross-section of 20 mm ?? 100...
Electronic assemblies in field use are exposed to a wide range of environmental loads. The interaction of combined loads has to be considered in lifetime estimates of electronic packages. In this paper, we discuss lifetime prediction for lead-free soldered flip chips under vibration load in different temperature environments in terms of solder joint fatigue. Parameters for lifetime modeling are obtained...
Static thermal analysis of a coil has been presented in this paper. The system for temperature measurement has been designed and described. The calculation results obtained by using finite element method analysis have been verified experimentally.
This paper presents a test rig designed at the University of Cape Town to evaluate the performance of a high speed electromechanical flywheel for energy storage. The electromechanical flywheel is specifically designed to enhance rural electrification through improving the energy storage component in solar home systems. A safe, flexible and low vibration test rig has been designed. Modal analysis using...
Many polymer based materials, such as molding compound and underfill, are commonly used in plastic encapsulated packages. In spite of many advantages, most of them, however, are hydrophilic and absorb moisture when exposed to a humid environment. Moisture absorption induces swelling and deformation in a package and leads to failure in some cases. For example, when polymer materials swell upon absorbing...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.