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Author: search.filters.author.Mongkol, MongkolwongrojnSubject: search.filters.subject.Surface roughness

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    Effect of micro-particles on rough surface spur gears under TEHL with non-Newtonian lubricant
    (2016-01-01)
    Mongkol, Mongkolwongrojn
    ;
    Jesda, Panichakorn
    This paper presents the performance characteristics of rough surface spur gears under thermo-elastohydrodynamic lubrication (TEHL) with non-Newtonian solid-liquid lubricant based on a Power law viscosity model. The bi-phase lubricant contains oil with Molybdenum disulfide particles. The time dependent modified Reynolds equation, elasticity equation, powder load carrying capacity, and energy equation with initial conditions were formulated and solved numerically using a multigrid multilevel with full approximation technique for an involute spur gear. In this analysis, the normal load and overloads are applied on either two pairs or one pair of gear teeth respectively. The transitions from two pairs to one pair and vice versa are modeled as a step variation of load. The effects of solid particle concentration, diameter of solid particle and surface roughness were examined in the region along the line of action of the meshing gear. The results show that both solid particle concentration and surface roughness affect significantly the film thickness, film temperature and friction coefficient, but the diameters of solid particle are relatively insignificant for rough TEHL.
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    Effect of liquid-solid lubricant on mixed lubrication in line contact
    (2012-01-18)
    Sountaree, Rattapasakorn
    ;
    Jesda, Panichakorn
    ;
    Mongkol, Mongkolwongrojn
    This paper presents the performance characteristics of two surfaces in line contact under isothermal mixed lubrication with non-Newtonian liquid-solid lubricant base on Power law viscosity model. The time dependent Reynolds equation, elastic equation and viscosity equation were formulated for compressible fluid. Newton-Raphson method and multigrid technique were implemented to obtain film thickness profiles, friction coefficient and load carrying in the contact region at various roughness amplitudes, applied loads, speeds and the concentration of solid lubricant. The simulation results showed that roughness amplitude has a significant effect on the film pressure, film thickness and surface contact pressure in the contact region. The film thickness decrease but friction coefficient and asperities load rapidly increases when surface roughness amplitude increases or surface speed decreases. When the concentration of solid lubricant increased, friction coefficient and asperities load decrease but traction and film thickness increase. © (2012) Trans Tech Publications, Switzerland.