Thermal-Fluid-Solid Coupling in Thermal Characteristics Analysis of Rolling Bearing System Under Oil Lubrication

2019 ◽  
Vol 142 (3) ◽  
Author(s):  
Xu Hao ◽  
Xianghe Yun ◽  
Qingkai Han
Keyword(s):  
Network Model ◽  
Heat Generation ◽  
Heat Dissipation ◽  
Housing System ◽  
Large Temperature ◽  
Transient Temperature ◽  
Coupling Effects ◽  
Temperature Deviation ◽  
Thermal Network ◽  
Generation Structure

Abstract It is necessary to use the thermal network method for thermal analysis of the bearing, but there are still some shortcomings. In this paper, a novel thermal network model of the bearing transient temperature is developed considering the thermal-fluid-solid coupling effects. First, the quasi-static analysis of the bearing is carried out considering the thermal expansion effect, and the heat generation, heat transfer, and heat dissipation are studied. Then, the coupling effects between the oil characteristics, heat generation, structure parameters, and temperature (thermal-fluid-solid) during the operation of the bearing are discussed, and the transient thermal network model of the bearing-shaft-bearing housing system is established. Test results indicate that the existing models (without thermal-fluid-solid coupling) have large temperature deviation, while the proposed model in this paper considering the thermal-fluid-solid coupling effects is much more accurate. Finally, the effects of rotational speed, load, oil temperature, and oil flowrate on the temperature rise are all achieved and discussed.

A Physical Thermal Network Model of Press Pack IGBTs Considering Spreading and Coupling Effects

2020 ◽  
Vol 10 (10) ◽  
pp. 1674-1683
Author(s):  
Yiming Zhang ◽  
Erping Deng ◽  
Zhibin Zhao ◽  
Shi Fu ◽  
Xiang Cui
Keyword(s):  
Network Model ◽  
Coupling Effects ◽  
Thermal Network

Application of a Thermal Network Method to Thermal Analysis of Electronic Devices Using Phase Change Materials

2009 ◽  
Author(s):  
Sadakazu Takakuwa ◽  
Masaru Ishizuka ◽  
Shinji Nakagawa ◽  
Kanji Takagi
Keyword(s):  
Phase Change ◽  
Temperature Rise ◽  
Phase Change Materials ◽  
Heat Dissipation ◽  
Design Parameters ◽  
Transient Temperature ◽  
Thermal Network ◽  
Network Method ◽  
Pin Fins ◽  
Thermal Network Method

This paper describes transient cooling technology for electronic equipment using Phase Change Materials (PCMs) and a heat sink with pin fins. We designed an electronic module including paraffin as the PCM and measured its transient temperature rise. The effects of the diameter of pin fins and heat dissipation values were investigated as design parameters. The results show that the temperature rise values were controlled by the thermal absorption effect due to the latent heat of the PCM. It is also confirmed that the proposed thermal network method with an equivalent specific heat model has strong potential for use in the analysis of electronic modules using PCMs.

Thermal Network Model for Temperature Prediction in Planetary Gear Trains

2011 ◽  
Vol 86 ◽  
pp. 415-418 ◽  
Author(s):  
Li Feng Chen ◽  
Xiao Ling Wu ◽  
Da Tong Qin ◽  
Ze Jun Wen
Keyword(s):  
Network Model ◽  
High Power ◽  
Planetary Gear ◽  
Transient Temperature ◽  
Pressure Balance ◽  
Temperature Prediction ◽  
Conservation Of Energy ◽  
Thermal Network ◽  
Planetary Gear Trains ◽  
Gear Trains

Their high-power-density design combined with their limited space make planetary gear trains often high power losses difficult to dissipate to the surround in time. The thermal network model for temperature prediction in planetary gear trains has been proposed. According to the principle of the conservation of energy, the thermal network model have been built and the model have been employed to analyze the transient temperature of the three stage 2K-H planetary gear trains used in Φ6.3m earth pressure balance(EPB) shield machine in series. The computed temperature results of the proposed TNM were in very good agreement with experimental measurements. It has been shown that this method is capable of performing temperature analysis. The results stemmed from the TNM have been shown that the temperature rise of the sun gears is quicker than the other parts and the PGT doesn’t reach thermal balance after the oil temperature reached 90 degrees, so the cooling system should be compelled.

Control Method for Cooling Fans inside Traction Battery Boxes Installed in Battery Powered EMU Based on Thermal Network Model

2020 ◽  
Vol 140 (9) ◽  
pp. 625-632
Author(s):  
Yoshiaki Taguchi ◽  
Satoshi Kadowaki ◽  
Gaku Yoshikawa ◽  
Kenji Hatakeda ◽  
Takashi Kaneko
Keyword(s):  
Network Model ◽  
Control Method ◽  
Thermal Network ◽  
Cooling Fans

Transient Temperature and Heat Flux Measurement in Ultrasonic Joining of Battery Tabs Using Thin-Film Microsensors

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Hang Li ◽  
Hongseok Choi ◽  
Chao Ma ◽  
Jingzhou Zhao ◽  
Hongrui Jiang ◽  
...  
Keyword(s):  
Thin Film ◽  
Heat Flux ◽  
Heat Generation ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Transient Temperature ◽  
Monitoring And Control ◽  
Change Rate ◽  
Flux Change ◽  
And Control

Process physics understanding, real time monitoring, and control of various manufacturing processes, such as battery manufacturing, are crucial for product quality assurance. While ultrasonic welding has been used for joining batteries in electric vehicles (EVs), the welding physics, and process attributes, such as the heat generation and heat flow during the joining process, is still not well understood leading to time-consuming trial-and-error based process optimization. This study is to investigate thermal phenomena (i.e., transient temperature and heat flux) by using micro thin-film thermocouples (TFTC) and thin-film thermopile (TFTP) arrays (referred to as microsensors in this paper) at the very vicinity of the ultrasonic welding spot during joining of three-layered battery tabs and Cu buss bars (i.e., battery interconnect) as in General Motors's (GM) Chevy Volt. Microsensors were first fabricated on the buss bars. A series of experiments were then conducted to investigate the dynamic heat generation during the welding process. Experimental results showed that TFTCs enabled the sensing of transient temperatures with much higher spatial and temporal resolutions than conventional thermocouples. It was further found that the TFTPs were more sensitive to the transient heat generation process during welding than TFTCs. More significantly, the heat flux change rate was found to be able to provide better insight for the process. It provided evidence indicating that the ultrasonic welding process involves three distinct stages, i.e., friction heating, plastic work, and diffusion bonding stages. The heat flux change rate thus has significant potential to identify the in-situ welding quality, in the context of welding process monitoring, and control of ultrasonic welding process. The weld samples were examined using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) to study the material interactions at the bonding interface as a function of weld time and have successfully validated the proposed three-stage welding theory.

Self-Heating and Thermal Network Model for Complementary FET

2021 ◽  
pp. 1-6
Author(s):  
Songhan Zhao ◽  
Linlin Cai ◽  
Wangyong Chen ◽  
Yandong He ◽  
Gang Du
Keyword(s):  
Network Model ◽  
Self Heating ◽  
Thermal Network
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