scholarly journals Analysis of Temperature Characteristics of High-speed Rail Bearings based on Dynamics Model and Thermal Network Method

2021 ◽  
Author(s):  
Bao-sen Wang ◽  
Yongqiang Liu ◽  
Bin Zhang
Keyword(s):  
High Speed ◽  
Contact Point ◽  
Outer Ring ◽  
Dynamics Model ◽  
Temperature Characteristics ◽  
Thermal Network ◽  
Network Method ◽  
High Speed Trains ◽  
Ring Faults ◽  
Thermal Network Method

Abstract This paper establishes a dynamics model of the axle box bearing of high-speed trains. The model can obtain contact force and its change law. Between rollers and raceway when the bearing contains outer ring faults, inner ring faults, and rolling element faults. Based on the model, the thermal network method is introduced to study the temperature characteristics of axle box bearings of high-speed trains. In this model, the bearing can be divided into some isothermal nodes. The heat generation, conduction, and dispersion of these isothermal nodes can be solved. The results show that the temperature of the contact point between the outer ring raceway and the rolling elements is the highest. By analyzing the relationship between the node and the speed and fault size, it is obtained that the higher the speed, the higher the node temperature. When the fault size increases, the node temperature first increases and then decreases.

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.

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