scholarly journals Ageing of Aluminum Power Connectors Based on Current Cycle Test

2019 ◽  
Vol 4 (1) ◽  
pp. 110-114 ◽  
Author(s):  
Ghareeb Moustafa
Keyword(s):  
Contact Resistance ◽  
Temperature Rise ◽  
Operating Conditions ◽  
Heat Sources ◽  
Thermal Network ◽  
Network Method ◽  
Current Cycle ◽  
Thermal Network Method ◽  
Lower Temperature ◽  
A Current

The effect of current cycle on the behavior of contact resistance of clamped connectors was investigated experimentally to characterize the thermal behavior of the used clamped connector and optimizing the installation procedure in order to reduce contact resistance and ensure a lower temperature during normal operating conditions. The thermal network method is used for calculating the temperature rise of the connector when loaded by a current. The method is based on substitution of the connector geometry by a circuit consisting of thermal resistances, capacitance and heat sources. The temperature rise is determined using the network simulation program PSPICE with the corresponding thermal model libraries. The validity of the obtained results has been checked by comparing the computed values with those measured experimentally. The agreement was found satisfactory

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.

Study on real-time thermal–mechanical–frictional coupling characteristics of ball bearings based on the inverse thermal network method

2021 ◽  
pp. 135065012199356
Author(s):  
Tie-Jun Li ◽  
Meng-Zhuo Wang ◽  
Chun-Yu Zhao
Keyword(s):  
Real Time ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Time Varying ◽  
Ball Bearings ◽  
The Real ◽  
Thermal Network ◽  
Network Method ◽  
Thermal Network Method ◽  
Coupling Characteristics

The real-time thermal–mechanical–frictional coupling characteristics of bearings are critical to the accuracy, reliability, and life of entire machines. To obtain the real-time dynamic characteristics of ball bearings, a novel model to calculate point contact dynamic friction in mixed lubrication was firstly presented in this work. The model of time-varying thermal contact resistance under fit between the ring and the ball, between the ring and the housing, and between the ring and the shaft was established using the fractal theory and the heat transfer theory. Furthermore, an inverse thermal network method with time-varying thermal contact resistance was presented. Using these models, the real-time thermal–mechanical–frictional coupling characteristics of ball bearings were obtained. The effectiveness of the presented models was verified by experiment and comparison.

Thermal analysis of the triple-phase asynchronous motor-reducer coupling system by thermal network method

2020 ◽  
Vol 234 (12) ◽  
pp. 2851-2861
Author(s):  
Mingzhang Chen ◽  
Wuhao Zhuang ◽  
Song Deng ◽  
Chengjie Zhu
Keyword(s):  
Asynchronous Motor ◽  
Experimental Result ◽  
Lubricating Oil ◽  
Power Coefficient ◽  
Element Analysis ◽  
Thermal Network ◽  
Coupling System ◽  
Network Method ◽  
Core Components ◽  
Thermal Network Method

As the core components of mechanical power system, triple-phase asynchronous motor and reducer are required strictly for temperature control. In this paper, the triple-phase asynchronous motor and the reducer are regarded as a coupling system, and thermal network method is used to predict the temperature field distribution of the coupling system. The predicted temperature of the thermal network method is consistent with the experimental result and the finite-element analysis. Furthermore, analysis shows that motor output power, coefficient of friction between teeth and lubricating oil parameters have a great effect on reducing the temperature of the coupling system.

Practical Study of Application of Thermal Network Method to Thermal Design of Electronic Equipment: An Example for the Thermal Design of a Compact Self-Ballasted Fluorescent Lamp

2006 ◽  
Author(s):  
Masaru Ishizuka ◽  
Shinji Nakagawa ◽  
Katsuhiro Koizumi
Keyword(s):  
Network Model ◽  
Simulation Method ◽  
Thermal Design ◽  
Fluorescent Lamp ◽  
Simulated Model ◽  
Thermal Network ◽  
Fluorescent Lamps ◽  
Network Method ◽  
Thermal Network Method ◽  
Good Agreement

Thermal design is one of the most important issues in the development of compact self—ballasted fluorescent lamps as the demand for small yet powerful lamps is mounting. This paper proposes a simulation method that is based on a thermal network model for which a set of equations are developed. Some of the coefficients of the thermal network equations were determined experimentally using a simulated model lamp. The calculated temperatures are in good agreement with the measured temperatures. The work illustrates the usefulness of the proposed methodology in the design of compact self—ballasted fluorescent lamps.

Thermal behaviour analyses of gas-insulated switchgear compartment using thermal network method

2016 ◽  
Vol 10 (12) ◽  
pp. 2833-2841 ◽  
Author(s):  
Mariusz Stosur ◽  
Pawel Dawidowski ◽  
Marcin Szewczyk ◽  
Kacper Sowa ◽  
Przemyslaw Balcerek
Keyword(s):  
Thermal Behaviour ◽  
Thermal Network ◽  
Gas Insulated Switchgear ◽  
Network Method ◽  
Thermal Network Method
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