Dr. Hazim Jamali
Dr. Hazim Jamali is a faculty member of the college of engineering at the University of Karbala, Iraq; he studied mechanical engineering at the University of Baghdad, where he was awarded B.S. and M.Sc. degrees. He recently completed his doctoral studies at the Cardiff School of Engineering, Cardiff University where he was awarded a Ph.D. for his thesis "Analysis of Helical Gear Performance Under Elastohydrodynamic Lubrication." Jamali's principal research interest is in gear technology and numerical analysis, and he has in fact authored several papers in this area of study. (Bio last updated 2016-08-01 Contact Randy Stott, Managing Editor, with changes.)
Articles by Hazim Jamali
- Transient EHL Analysis of Helical Gears (August 2016)
This paper addresses the lubrication of helical gears - especially those factors influencing lubricant film thickness and pressure. Contact between gear teeth is protected by the elastohydrodynamic lubrication (EHL) mechanism that occurs between nonconforming contact when pressure is high enough to cause large increases in lubricant viscosity due to the pressure-viscosity effect, and changes of component shape due to elastic deflection. Acting together, these effects lead to oil films that are stiff enough to separate the contacting surfaces and thus prevent significant metal-to-metal contact occurring in a well-designed gear pair.