A finite element thermal simulation of a microwave blackbody calibration target

In this paper a numerical simulation of the construction process of roller compacted concrete (RCC) dams is presented. The following features of construction of mass concrete have been considered: hydration heat, age, placing temperature, starting placement date, and placing speed. A 3-D finite element model of the Long-Tan RCC dam, which is to be built in the Guangxi Autonomous Region in China, was analyzed. Temperature distribution and evolution inside the RCC dam were calculated during and after the completion of the dam. Using FortranTM code, a 3-D thermal simulation analysis of a high RCC dam can be realized on a computer at the construction site. Based on the real factors during the construction period, engineers can predict the distribution of temperature in the RCC dam. Therefore, engineers can take appropriate measures to control concrete temperature to reduce thermal stress within the dam. The effects of the concrete placing temperature, construction speed, and starting date on the temperature are discussed. It has been found that the maximum temperature in a dam can be reduced by 20% through temperature control measures.Key words: RCC dam, thermal simulation analysis, finite element method, temperature field, construction schedule.

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Generation and evaluation of dynamic compact thermal model of electronic packages

10.32920/ryerson.14655813.v1 ◽

2021 ◽

Author(s):

Mohsen Marami

Keyword(s):

Finite Element ◽

Thermal Model ◽

Cooling System ◽

Thermal Simulation ◽

Compact Model ◽

Model Generation ◽

Analysis Tool ◽

Electronic Packages ◽

Static And Dynamic Analysis ◽

Bga Package

The goal of this research is to develop a Dynamic Compact Thermal Model (DCTM) of electronic packages. The general objectives of thermal modeling are to increase the accuracy of electrical analysis by taking the effect of temperature variation into consideration, predicting the reliability of the product, and acquiring the information which is necessary to design the cooling system in order to enhance the performance of the electronic systems. The project is focused on generating the dynamic compact thermal model of electronic packages so that the transient thermal behaviors of the package could be predicted fast and accurately. The approach proposed by DELPHI consortium (a collaborative European project) for static compact thermal model generation is extended in this work to generate the dynamic compact model of a BGA package represented by a RC network or admittance matrix. Two steps performed as the methodology of dynamic compact model generation in this work are: 1- A static compact thermal model of BGA package is generated and validated from the static thermal simulation and 2- A RC network is proposed as the contribution of this work and calculated by optimization as the dynamic compact thermal model of the package using the data of transient simualtion. The size of the proposed RC network then is optimized by eliminating some capacitors from the original RC network and validated by comparing its output to the ouptut of finite element simulation. COMSOL©, a Finite element analysis tool is used for thermal simulation and detailed steady state and transient model generation. The optimization algorithm implemented for both static and dynamic compact model generation is Nelder-Mead multidimensional optimization which is realized by MATLAB© programming. The obtained results from the compact models for both static and dynamic analysis of the BGA package are in agreement with the detailed thermal model results and with the available results in literature.

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Experimental and Numerical Simulation of Multipass Hot-Rolling on 7150 Aluminum Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.624.138 ◽

2014 ◽

Vol 624 ◽

pp. 138-142

Author(s):

Jian Li

Keyword(s):

Numerical Simulation ◽

Finite Element ◽

Aluminum Alloy ◽

High Temperature ◽

Hot Rolling ◽

Thermal Simulation ◽

Data Simulation ◽

Related Data ◽

Finite Element Software ◽

Rolling Experiment

The content discussed in this paper about 7150 aluminum alloy is based on the thermal simulation technology, which is an experiment using the way of temperature compression to do high temperature shaping and passes softening. And using the popular business-oriented finite element software simulates the related data of the multipass hot-rolling on 7150 aluminum alloy. By the obtained parameters, it carries out the hot-rolling experiment and processing of RRA technology. Based on this, it analyzes the experimental and data simulation of multipass hot-rolling on 7150 aluminum alloy.

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