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

Abstract

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.

Research on influencing factors of deformation of hydrostatic thrust bearings

“…The oil film temperature rise will gradually increase during the operation of the hydrostatic thrust bearings, and the main factor leading to the increase in the oil film temperature is the power loss of the hydrostatic system. One is the power consumption N p of each component in the process of supplying oil to the oil chamber by the oil pump, and the other is the frictional power loss N f from the shearing and extrusion of the oil film and the workbench, [23][24][25] the formula for calculating power loss is shown in equation (1):…”

“…Li et al 1 applied fractal theory and heat transfer theory to establish the time-varying contact thermal resistance model under the coordination of ring and ball, ring and shell, ring and shaft, and obtained the real-time thermomechanical–friction coupling characteristics of ball bearings. Guo et al 2 studied the temperature rise characteristics of hydrostatic thrust bearings with four different chamber structures, which provided a theoretical basis for the prediction of thermal deformation of hydrostatic bearings.…”

“…In order to calculate the accuracy, the three methods of the oil supply temperature methods, thermal boundary layer method, and thermal oil carry forward method were coupled and verified by experiments. Zhang et al 4 selected the temperature rise characteristics of hydrostatic bearings under the change of oil film thickness and different working conditions as the research 1 Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin, China 2 Qiqihar First Machine Tool Factory Corp. Ltd., Qiqihar, China 3 Qiqihar Heavy CNC Equipment Corp. Ltd., Qiqihar, China 4 Qiqihar University School of Electrical and Mechanical Engineering, Qiqihar, China object. Dynamic mesh method and variable viscosity dynamic simulation were used to obtain the changing rules of temperature rise curves at different inlet flow rates and rotational speeds.…”

The Simulation Analysis and Experimental Study on the Temperature Field of Four Row Rolling Bearings of Rolling Mill under Non-Uniform Load Conditions

“…The heat generated in the node equals heat dissipation, and the nodes are connected by thermal resistance. The temperature value of each knob is obtained by tackling the heat equilibrium condition of each node [15]. Harris and Kotzalas [16] calculated the temperature inside the bearing using the thermal resistance method and classified the heat transfer of the bearing.…”