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This paper presents a simple yet effective method to determine the flux density-magnetic field intensity (B-H) characteristics of the magnetic material used in a salient pole synchronous machine (SPSM). This is achieved by distributing the magnetic field intensity, H, in the different parts of SPSM using 2D Finite Element (FE) simulations and theoretical calculations. The distribution is based on...
The aim of the paper is to present a structural characterization of the bell tower of the Cathedral of Trani (Bari, Italy) collecting the data of two different non-destructive techniques. The tower, built in 1200, is about 60 meters high and has a square plan with a side of about 7.50 meters; moreover, it is connected to the church through a step supported by a pointed arch. Firstly, an Operational...
The wedge bonding process on a sensor chip design has been simulated using three-dimensional FEM, across a range of die bond stiffness's, where the results and analysis thereof are discussed in this paper. Comparisons have been made with respect to the influence of the stiffness of the die bond, which has implications for both the sensitivity and accuracy of the sensors. Soft die bonds are preferable,...
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...
This paper describes the importance of residual magnetism in the stator of a brushless exciter used in a self-starting alternator set. It then shows how a pragmatic hysteresis model within finite element simulations of the exciter can be used to optimize the material properties required to obtain the maximum residual exciter armature voltage, while also minimizing the losses associated with using...
A multi-layer piezoelectric actuator (PEA) stacks piezo thin layers which can convert electric energy to deformation. It is widely used to generate nano-scale displacements. It is well known that the more layers one can stack for a given overall PEA length, the more deformation it can produce when excited by the same voltage. As a result, there is a tendency to reduce the thickness of piezo layers...
Wheel speed sensors are commonly used in automotive applications where knowledge of the precise rotational velocity of the wheels is required to determine the vehicle speed or to obtain subtle information about tire pressure, road conditions or to steer modern driver assistance systems like the Electronic Stability Program. The conventional back-bias speed sensor solution requires the design of a...
In 3D through-silicon-via (TSV) interposer package, there are large numbers of micro bumps and micro solder balls, the sizes of the entities in the package having a difference of 3 orders of magnitude. This multi-scale structure brings difficulties to establish the finite element model for analyzing the thermal fatigue life of board-level solder joint. Homogenization method is adopted to avoid these...
The influence of viscoelastic behavior of polybutylene terephthalate (PBT) on reliability of the thermal contact of a spotlight module is evaluated. The contact between a module and the heat sink is evaluated using non-linear finite element model. The viscoelastic behavior of PBT was obtained under multiple frequencies from single cantilever DMA experiments. The relevant viscoelastic parameters (i...
An incrementally coupled mechanical-ultrasonic finite element model is developed to model the thermosonic Cu wire bonding process on Cu/low-k chips, in order to study the influences of key process and design parameters on the stress conditions in the chips. The model takes into account of both mechanical oscillation effects and the softening effects of ultrasounds, and stresses developments during...
As an indispensible part of electronic equipment, the reliability of the whole system is affected by the degradation performance of power MOSFET tube. Based on geometry, material properties and boundary conditions, the repeated testing can be reduced, and the period of failure analysis can be shortened. This article is based on the finite element model of power MOSFET TO-263, electric thermal — mechanical...
Thermal interface materials (TIMs) which consist of metal foil and soft cushion are used in the process of chip processor platform validation (PPV) process, and some defects, such as the stains caused by debris peeled off from TIMs due to stress concentration, were found on the surface of the chips and they had an hazardous influence in the testing process. As well as that, the thermal resistance...
The 3D finite element analysis models of 3D-TSV interconnect structure were developed. By using ANSYS the finite element analysis of the stress and strain distribution in the model was performed under random vibration load. Comparative analysis of the stress and strain of TSV interconnect structure between the micro-bump materials are copper and SAC387. And also comparative analysis the stress and...
The engine box and the bearing cover have high concentricity requirements. In response to this, cutting parameter optimization of the main bearing bore boring process is presented. Combined with the processing requirements and processing characteristics of the main bearing bore boring process, the three-dimensional finite element model was established based on the Deform-3D. The variation of cutting...
In this paper, the XYZ translational parallel micromanipulator with three-dimension is proposed. The whole mechanism is fully symmetric about x and y axes. The end-effector with the centre of the plane may acquire the ideal effect according to using the different number of S-hinges (spherical hinge with three degrees of freedom). Therefore, the four types of mechanisms with different numbers of S-hinges...
In this paper, a cavity backed spiral antenna is introduced. The antenna is a four-arm Archimedean spiral antenna. To effectively direct the radiation in the upper half space region, the spiral antenna is backed by a conducting cavity, which is peripherally filled by an absorber ring. Antenna radiates circularly polarized waves. The height of the surrounding cavity is only 7mm, which leads to an extremely...
Paraboloid of revolution shaped resonator(abbreviated as PRSR) as a new solid-state wave gyroscope resonator, is the core component of Bell-shaped vibratory angular rate gyro(abbreviated as BVG) which sensitizes angular movement through the Coriolis effect of standing wave in resonance state of axisymmetric shell. Structural characteristics of the resonator make itself have the feature of withstand...
A bearing is a machine element used to constrain relative motion and reduces friction between moving parts with necessary lubrication provided. Bi-metal aluminium bearing manufacturers say their products offer long-term durability, dry-start protection, resistance to debris, corrosion resistance and dimensional accuracy for stock and light duty, as well as performance and racing, applications. The...
The first step in FEM-based deformation is voxelization, which means objects showed in original mesh will be desecrated into mass of small units (voxels), and then the characteristic matrix can be fetched with the coordinate, shape, and attributes of voxels. This paper focuses on the reciprocity between specifying voxel physical parameter and simulating the deformation. A table list out provides physical...
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...
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