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A finite-element model was implemented to study the transient thermoelastic–plastic contact between a thermal asperity sensor and a thermal asperity on a disk in a hard disk drive. The temperature change of the thermal asperity sensor during contact with an asperity was calculated and converted into resistance change of the sensor using experimental measurements for the relationship between the sensor...
In Gas Insulated Switchgear (GIS) the loop resistance is a key parameter which can characterize the contact condition of the conductive circuit. The current method to measure loop resistance was mostly proposed and used in routine test, commissioning test and overhaul. The monitoring of abnormal conditions of contacts in operation has not been realized yet. To early detect the hidden contact defects...
In this paper analyzes the thermal characteristics of light emitting diode (LED) streetlight module which has serious problems of heat dissipation. Firstly, Finite Element Method (FEM) combined with the heat transfer theory was utilized to calculate the thermal performance of an LED streetlight module by the ANSYS. Then, the thermal behavior of LED streetlight module is investigated by experimental...
The ratio of the temperature gradient at solidification front to the solidification rate of solid-liquid interface plays a great role for columnar grain growth. Transient temperature fields of directional solidification of Al-Ni-Co-Ti alloys were studied based FEM. The effect of molten steel pouring temperature, heat flux and mould temperature on the ratio was analyzed. The results show that molten...
The identification of defect parameters in thermal non-destructive test and evaluation (TNDT/E) was considered as a kind of inverse heat transfer problem (IHTP) and a kind of structure design optimization problem, and the design results should meet the surface temperature profile of the apparatus with defects. An improved bacterial colony chemo taxis (IBCC) optimization algorithm and a radial basis...
The identification of defect parameters in thermal non-destructive test and evaluation (NDT/E) was considered as a kind of inverse heat transfer problem (IHTP). However, it can be farther considered as a shape optimization problem then a structure design optimization problem, and the design results should meet the surface temperature profile of the apparatus with defects. A bacterial colony chemotaxis...
Finite element analysis (FEA) was carried out on a bed plate utilizing Patran/Nastran software. The GAP elements were used to simulate the contact status between bearing housing and bed plate. It was concluded that stress distribution status was obtained really and precision of the calculation was improved as well as reducing the time of the calculation. GAP element was an available method for simulating...
Combination of bionics principles, according to the structure of the human lung bronchus, the Jetta 2V engine exhaust manifold be biomimetic designed optimization, and use finite element software ANSYS CFD module FLOTRAN to analysis flow field and coupled thermal field for the original exhaust manifold and bionic exhaust manifold., comparing two kinds of exhaust manifold temperature field and flow...
The spindle is an important part of a CNC machine tool, and it is very significant to study how to simulate the deformation of the spindle accurately no matter in theoretical or practical way. Traditionally, the boundary coefficients for simulation have always been defined as some constants with the help of personal experience. This is the main reason for inaccuracy in the thermal model deducing....
Heat transfer in biological tissues based on the theory of porous media has recently attracted attention because porous media play an important role in many biomedical applications. In this study, a porous model of human forearm was proposed, which took the blood-tissue convection into consideration. Finite element method was used to analyze the heat transfer equation. In addition, the influences...
The heat dissipation of six different types of microchannel networks integrated in LTCC based microsystems has been investigated by experimental measurement and simulation analysis, including straight, serpentine, spiral and fractal-shaped microchannel networks of curve, I-shaped and parallel. The cross section of microchannel is 200 ??m ?? 200 ??m and the total length is about 200 mm. The water mass...
According to theory of metal cutting and heat transfer, mathematical model of temperature field when work piece is milled by ball-milling cutter was established using moving heat source theory. Joint modeling method of work piece temperature field was studied in the environment of PRO/E and ALGOR. Three dimensional modeling of work piece was finished by PRO/E, and all-moving surface heat source's...
Hard disk drive (HDD) is often subjected to transient temperature during frequent seeking or due to the change of environmental conditions that causes HDD reliability problems. This paper presents a three dimensional (3D) finite element modelling technique that can be used to predict the transient temperatures of the HDD when it subjected to transient temperature during frequent seeking or due to...
The temperature field of a wind generator is analyzed by finite element method. The steady-state heat transfer mathematic model is set up, and hypothetical conditions are presented, together with boundary conditions and loads are calculated according to the heat transfer theory in air-cooling condition. Dealing with the calculation results of the temperature field of the wind generator, the temperature...
A multi-dimension comprehensive thermal model is presented to simulate the steady temperature distribution of breast, which is based on the breast anatomical structure and physiological characteristics. This model takes the metabolic heat generation, blood perfusion and vascular thermal interaction into account. Finite element analysis method is used to solve the heat diffusion equation. The simulated...
The heat transfer analysis presented in this study deals with the thermal performance of the helix slow-wave circuit for TWT. The current paper estimate the temperature of helix accurately through finite element software ANSYS. The expansion of rods makes the helix concave or convex at different position. Thermal strain made the radius of the tape increased overall, so the phase velocity decreases...
SF6 gas insulated transformer (GIT) has the advantages of nonflammable and non-explosive. However, there is a deviation in flows near the coils, which results the coil temperature overheat. In order to remove the deviation of flow, it is necessary to use force-directed-gas duct cooling system. In this paper, the force-directed-gas duct heat fluid coupled finite element method is presented based on...
The thermal response of the GMR sensor during the ESD pulse is investigated using finite element model. The simulation compares the transient temperature rise in GMR sensor when they are subjected to the Human Body Model (HBM) and Charged-Device Model (CDM) waveforms. The results indicate that the ESD threshold damage for GMR head depends on both the thermal time constant and the ESD transient current.
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