Multigrid method for the solution of EHL point contact with bio-based oil as lubricants for smooth and rough asperity

Awati, Vishwanath B.; Naik, Shankar; Kumar, Niraj

doi:10.1108/ilt-12-2016-0314

Cited by 6 publications

(4 citation statements)

References 29 publications

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“…Suk Man MOON et al [1] found that as the contact surface clearance and lubricant temperature decreased, the maximum oil film pressure decreased and the oil film thickness increased, when they studied the lubrication characteristics of diesel engine crank pin bearings. Vishwanathu B. Awati et al [2] studied the effect of surface longitudinal roughness on lubrication. Jean-David Wheeler et al [3] used a generalized differential colorimetric interferometry method to detect oil film thickness, which provided a new test method for lubrication research.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Point Contact Isothermal Elastohydrodynamic Lubrication Characteristics of a New Type of Trigeminal Universal Coupling for Automobile

Yao

Yang

2023

J. Phys.: Conf. Ser.

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This thesis designed a new type of trigeminal universal coupling structure that changes the original surface contact sliding friction into point contact rolling friction. We analyzed the characteristics of isothermal elastohydrodynamic lubrication to ensure new construction on the drive shaft stability, reliability, and durability. First, we established a contact model of the improved new structure and analyzed the isothermal elastohydrodynamic characteristics of the point contact. Then we studied the input shaft frequency, load, deflection angle, and lubrication characteristics. Research indicated that the other being equal, the faster the input shaft frequency could lead to a thicker oil film, a higher oil film pressure, and a higher secondary pressure peak. The higher load could cause the thinner oil film thickness, the lower oil film pressure, the later position where the pressure begins to increase, and the less obvious second pressure peak. The greater deflection angle could bring about the thicker oil film thickness, the higher oil film pressure, the earlier position where the pressure began to increase, and the earlier position at which the secondary pressure peak was located. This phenomenon was more pronounced in the contact center area.

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Section: Introductionmentioning

confidence: 99%

Analysis of Point Contact Isothermal Elastohydrodynamic Lubrication Characteristics of a New Type of Trigeminal Universal Coupling for Automobile

Yao

Yang

2023

J. Phys.: Conf. Ser.

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“…Chen and Ford [26,28] were first to explore the use of wavelet pre-conditioner for the solution of large system of equations, and checked the efficiency of pre-conditioner by implementing it to EHL line contact problem. Awati et al [29] discussed the solution of EHL point contact problem with bio-based oil as lubricant and noticed that, the minimum film thickness decreases with increase in load; at the same time central film thickness increases with increase in load at constant speed.…”

Section: Introductionmentioning

confidence: 99%

Newton-GMRES-Method for the Scritinization of electric double layer and surface roughness on EHL line contact problem

Awati

Obannavar

2023

JMES

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The electric double layer phenomenon exists on the solid interface under the water-liquid condition. The water molecules are ionized and adhered in the interface forming the sturn layer is a diffused layer in which molecules can move with the movement of bulk of molecules. Because of these two characteristics, the boundary layer of water molecules is called the electric double layer. The aim of present study is to explore the impact of two fraction surfaces of electric double layer (EDL) on a thin water lubricating film on an elastohydrodynamic lubrication (EHL) line contact problem with a sinusoidal surface roughness. The governing modified Reynolds and film thickness equations are based on mathematical model of electro-viscosity of asymmetrical electrical double layer is analyzed numerically. The viscosity-pressure relation of water and theoretical evaluation pertaining to the effect of electric double layer on film-thickness and pressure distribution of EHL with water film of line contact problem is discussed in detail. The effect of zeta potential on film thickness and pressure is determined using Newton’s-GMRES method with Daubechies D6 wavelet as a pre-conditioner. The results predict that, EDL has less impact on pressure distribution and significant impact on film thickness. The obtained results are compared with results of Dowson and Higginson which are comparable.

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“…Masjedi and Khonsari [34] deliberated the inclusion of surface roughness in EHL point contact, a statistical based elasto-plastic model was used to investigate the influence of surface roughness. The isothermal EHL point contact problem with bio-based oil as lubricant on smooth and rough surface asperity was numerically studied by Awati et al [35] further concludes that the bio-based product bring out an alternative source of lubricant to reduce the energy crises. Zhang et al [36] presented the point contact thermal EHL problem with zero entrainment velocity (ZEV) by considering both Newtonian and Erying model.…”

Section: Introductionmentioning

confidence: 99%

Multigrid method for the solution of thermal elastohydrodynamic lubrication point contact problem with surface asperities

Awati,

Obannavar,

Nanjaiah

2023

Mech. Eng. Advan.

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The paper presents, the numerical investigation of point contact thermal elasto-hydrodynamic lubrication (EHL) with surface asperities are analyzed. The effect of temperature and surface roughness on fluid film thickness is studied in detail. The governing equations comprises Reynolds, film thickness, load balance and energy equations with appropriate boundary conditions. The second order finite difference approximation is used to discretize the governing equations and the resultant nonlinear system of algebraic equations is solved using Multigrid V-cycle with full approximation scheme (FAS) technique. Multi level multi integration (MLMI) technique is employed to solve the film thickness equation. The obtained results are illustrated in the form of graphs and tables which are comparable with earlier findings. The film thickness profiles shows dimple near to the outlet region due to temperature-viscosity wedge mechanism. Isothermal minimum film thickness is higher than the thermal minimum film thickness. Minimum film thickness is much smaller due to slide to roll ratio is positive ascompared to negative, whereas the behavior of central film thickness is contrast as that of minimum film thickness.

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Multigrid method for the solution of EHL point contact with bio-based oil as lubricants for smooth and rough asperity

Cited by 6 publications

References 29 publications

Analysis of Point Contact Isothermal Elastohydrodynamic Lubrication Characteristics of a New Type of Trigeminal Universal Coupling for Automobile

Analysis of Point Contact Isothermal Elastohydrodynamic Lubrication Characteristics of a New Type of Trigeminal Universal Coupling for Automobile

Newton-GMRES-Method for the Scritinization of electric double layer and surface roughness on EHL line contact problem

Multigrid method for the solution of thermal elastohydrodynamic lubrication point contact problem with surface asperities

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