Journal of Applied Mechanical Engineering

External magnetic field of ferrofluids lubrication of journal bearing with twined solenoid

Global Summit and Expo on Fluid Dynamics & Aerodynamics

August 15-16, 2016 London, UK

Zhang Yan-juan, Wang Jian-mei and Li Decai

Beijing Jiaotong University, China
Taiyuan University of Science and Technology, China

Posters & Accepted Abstracts: J Appl Mech Eng

Abstract:

According to the effect of ferrofluids on the performance of magnetic liquid lubrication with external magnetic field, the mathematical model of internal magnetic induction intensity of oil-film bearing along radial and longitudinal direction was built and the distribution rules of internal magnetic induction intensity were studied. The oil-film bearing with twined solenoid was lubricated by ferrofluids. And the solenoids were designed to produce the magnetic field. The magnetic induction intensity of bearing consisted of exciting field generated by solenoid and derived field generated by magnetization bearing. In order to study the distribution of magnetic induction intensity within the load region of oil-film bearing, the magnetized bearing was simplified as solenoid model. The magnetic induction intensity at any point of finite solenoid was deduced based on Biot-Savart law and the elliptic integral is accomplished. On the basis of numerical solution of solenoid model and experimental measurement of magnetic induction intensity, the magnetizing current formula of bearing was deduced. Then, the magnetic induction intensity distribution of magnetization bearing was theoretically solved. Furthermore, the magnetic flux density of a wedge-shaped gap within the range of 1 mm between the shaft and bearing was obtained. The results showed that the magnetic induction intensity on both ends of the bearing was larger than that on the middle region. Ferrofluid lubrication with the function of external magnetic field can help reduce or prevent side leakage of magnetic fluid and display seal function to some extent. Meanwhile, it is also beneficial to the uniformity of oil film, and can guarantee the stability of lubrication status in load-carrying area.

Biography :

Email: wjmhdb@163.com