MACROSCOPIC BOUNDARY CONDITIONS AND MICROSCOPIC THERMAL MODEL FOR SLIDING CONTACT OF SOLIDS

1998 ◽  
Author(s):  
Piotr Furmanski ◽  
Mohamed A. R. A. Atshan
Keyword(s):  
Boundary Conditions ◽  
Thermal Model ◽  
Sliding Contact

scholarly journals A Structural Based Thermal Model Description for Vertical SiC Power MOSFETs under Fault Conditions

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Andreas Maerz ◽  
Teresa Bertelshofer ◽  
Mark-M. Bakran
Keyword(s):  
Boundary Conditions ◽  
Thermal Model ◽  
Short Circuit ◽  
Gate Oxide ◽  
Power Converter ◽  
Junction Temperature ◽  
Voltage Source ◽  
Model Description ◽  
General Description ◽  
Testing Procedures

The accurate prediction of the SiC MOSFET withstanding time for single fault events greatly influences the requirements for device protection circuits for these devices in power converter applications, like voltage source inverters or power electronic transformers. For this reason, a thermal model, based on the structural design and the physical dimensions of the chip as well as material properties of 4H-SiC, is proposed. This article gives a general description of the thermal behaviour of vertical SiC MOSFET under various driving and boundary conditions in case of a short-circuit event. The thermal model substitutes destructive tests of a device for an individual set of boundary conditions of an occurring fault event. The validity of the analytically parametrised thermal model is verified by experimental short-circuit tests of state-of-the-art vertical SiC MOSFETs for a set of various boundary conditions. The investigated thermal model can furthermore be used to standardise different gate-oxide degradation values from the literature for means of lifetime prediction of the gate oxide for an individual application under repetitive occurring fault or overload conditions. These manufacturer specific reported values measured with no standardised testing procedures can be translated into a maximum junction temperature, which is repeatedly reached. The thermal model therefore provides a unifying parameter for the gate-oxide lifetime calculation for an individual chip and application.

Thermal boundary conditions in sliding contact problem

2016 ◽  
Vol 103 ◽  
pp. 69-72 ◽  
Author(s):  
Yongwoo Lee ◽  
Yuwei Liu ◽  
J.R. Barber ◽  
Yong Hoon Jang
Keyword(s):  
Contact Problem ◽  
Boundary Conditions ◽  
Sliding Contact ◽  
Thermal Boundary Conditions

Friction, Wear, and Temperature in Sliding Contact

1980 ◽  
Vol 102 (1) ◽  
pp. 107-112 ◽  
Author(s):  
Hamid S. Al-Rubeye
Keyword(s):  
Thermal Model ◽  
Measuring Method ◽  
Spur Gear ◽  
Sliding Contact ◽  
Heating Process ◽  
Line Contact ◽  
Sliding Velocity ◽  
Body Temperatures ◽  
Load Carrying ◽  
Temperature Criterion

The temperature criterion plays a significant part in the attempt to interpret the scoring phenomenon of lubricated load-carrying machine members. Investigations were carried out to examine the correlation of the scoring bulk body temperatures, which have been measured on point and line contact machines using a modified Four-Ball and Spur Gear Tester. The simulation of the thermal model of both systems proved to be the only criterion for the correlation of the desired temperatures. A systematical investigation on the Four-Ball machine using a new temperature measuring method provided the basis to study the heating process of the sliding elements. The results show the influence of the loading and sliding velocity on both the bulk body temperature and the surface temperature.

scholarly journals Heating Detection and Temperature Control Method of Power Lithium Battery in Pure Electric Vehicle

CONVERTER ◽  
2021 ◽  
pp. 01-08
Author(s):  
Guanqiang Ruan Et al.
Keyword(s):  
Boundary Conditions ◽  
Lithium Ion Battery ◽  
Electric Vehicles ◽  
Temperature Control ◽  
Heat Generation ◽  
Thermal Model ◽  
Lithium Battery ◽  
Lithium Ion ◽  
Battery Pack ◽  
Electrochemical Characteristics

For the power battery of electric vehicles, especially pure electric vehicles, there is no perfect and comprehensive detection system and management system in the production and use links. By analyzing the working principle, structure and electrochemical characteristics of lithium-ion battery, the heat generation mechanism of lithium-ion battery was studied. In this paper, the factors that affect the temperature characteristics of Li ion battery are described, and the corresponding relationship between the temperature rise of the battery and the ambient temperature is established. At the same time, the optimal temperature range of the battery pack discharge efficiency is determined. In this paper, the thermal effect model and heat generation rate model of lithium-ion battery are established, and then the thermal conductivity, specific heat capacity, density and other parameters of the thermal model are calculated. Finally, the initial and boundary conditions of the thermal model are determined, the simulation of heat generation temperature field is realized, and the temperature distribution of the battery after heat generation is obtained. In this paper, the flow mode of air is analyzed, and the fluid structure coupling model of battery air is established. Finally, the thermal field of the battery pack is simulated by setting the solver mode and boundary conditions, which makes a theoretical analysis for the preliminary design of the temperature control battery box. The test results show that the method proposed in this paper can meet the technical requirements of power lithium battery heating management of pure electric vehicles..

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