Performance of magnetic fluid based rotating rough circular step bearings

• Autorzy: Patel H. C. , Deheri G. M. , Patel R. M.
• Języki publikacji: EN

Abstrakty

EN

An attempt has been made to analyze the performance of a magnetic fluid based rotating rough circular step bearing. The roughness of the bearing surface is modeled by a stochastic random variable with non zero mean, variance and skewness. The associated Reynolds' equation is solved with appropriate boundary conditions to obtain the pressure distribution, which in turn, is used to get the load carrying capacity leading to the calculation of response time. Results are presented graphically as well as in a tabular form. It is noticed that the bearing suffers on account of transverse surface roughness. This article makes it clear that pressure, load carrying capacity and response time increase with increasing the magnetization parameter. However, the negatively skewed roughness and radii ratio induce better performance. It is noticed that the load carrying capacity decreases when both plates rotate in the same direction. This trend reverses when the plates move in the opposite direction. This article reveals that the negative effect caused by porosity and roughness can be compensated to a considerable extent by the positive effect induced by the magnetization parameter and the aspect ratio in the case of negatively skewed roughness when the plates rotate in opposite direction.

Słowa kluczowe

EN

step bearing; magnetic fluid; rough surfaces; Reynolds equation; load carrying capacity

PL

łożysko stopowe; liczba Reynoldsa

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2008
• Tom: Vol. 13, no 2
• Strony: 441--455
• Opis fizyczny: Bibliogr. 31 poz., wykr.

Twórcy

autor

Patel H. C.

autor

Deheri G. M.

autor

Patel R. M.

• Gujarat Council on Science and Technology 7th Floor, M. S. Building, Sector-11 Gandhinagar - 382 011 Gujarat State, INDIA,

Bibliografia

• Andharia P.I., Gupta J.L. and Deheri G.M. (1999): Effect of transverse surface roughness on the behavior of squeeze film in a spherical bearing. - Journal of Applied Mechanics and Engineering, vol.4, pp.19-24.
• Berthe D. and Godet M (1973): A more general form of Reynolds equation- application to rough surfaces. - Wear, vol.27, pp.345-357.
• Bhat M.V. and Deheri G.M. (1991): Squeeze film behavior in porous annular disks lubricated with magnetic fluid. - Wear, vol.151, pp.123-128.
• Bhat M.V. and Deheri G.M. (1993): Magnetic fluid based squeeze film in curved porous circular disks. - Journal of Magnetism and Magnetic Material, vol.127, pp.159-162.
• Burton R.A. (1963): Effect of two dimensional sinusoidal roughness on the load support characteristics of a lubricant film. - J. Basic Eng. Trans. ASME, vol.85, pp.258-264.
• Christensen H. and Tonder K.C. (1969a): Tribology of rough surfaces: Stochastic models of hydrodynamic lubrication. - SINTEF Report No.10/69-18.
• Christensen H. and Tonder K.C. (1969b): Tribology of rough surfaces: Parametric study and comparison of lubrication models. - SINTEF Report No.22/69-18.
• Christensen H. and Tonder K.C. (1970): The hydrodynamic lubrication of rough bearing surfaces of finite width. - ASME-ASLE Lubrication conference; Paper No.70-Lub-7.
• Davies M.G. (1963): The generation of pressure between rough fluid lubricated, moving, deformable surfaces. - Lub. Eng., vol.19, pp.246.
• Deheri G.M., Patel H.C. and Patel R.M. (2006): Magnetic fluid based squeeze film between rotating porous rough annular plates. - (To appear in proceeding of LUBMAT-2006, London, U.K.).
• Deheri G.M., Patel H.C. and Patel R.M. (2006): Performance of magnetic fluid based circular step bearing. - MECHANIKA, No.1, vol.57, pp.22-27.
• Dowson D. (1961): Inertia effects in hydrostatic thrust bearings. - J. Basic Eng., Trans. ASME, D, vol.83, pp.227.
• Elwell R.C. and Sternlicht B. (1960): Theoretical and experimental analysis of hydrostatic thrust bearings. - J. Basic Eng., Trans. ASME, D, vol.82, pp.505-512.
• Ghosh M.K. and Majumdar B.C. (1982): Dynamic stiffness and damping characteristics of compensated hydrostatic thrust bearings. - J. Lub. Tech., Trans. ASME, F, vol.104, pp.491-496.
• Gupta J.L. and Deheri G.M. (1996): Effect of roughness on the behavior of squeeze film in a spherical bearing. - Tribology Transactions, vol.39, pp.99-102.
• Lin J.R. (1999): Static and dynamic characteristics of externally pressurized circular step thrust bearings lubricated with couple stress fluids. - Tribology International, vol.32, pp.207-216. (SCI) (NSC-88-2212-E-0253-001 V).
• Lin J.R. and Chinang C.F. (2002): Effects of surface roughness and rotational inertia on the optimal stiffness of hydrostatic thrust bearings. - Int. J. of Applied Mechanics and Engineering, vol.7, No.4, pp.1247-1261.
• Majumdar B.C. and Ghosh B. (1970): Load and flow parameters of externally pressurized oil-lubricated rectangular thrust bearings. - M.E. Division, The Instn. of Eng., No.1, vol.50, pp.253-257.
• Majumdar B.C. (1985): Introduction to tribology of bearings. - India: Wheeler Publisher, Wheeler Co. Ltd.
• Michell A.G.M. (1950): Lubrication, its principle and practice. - London: Blackie, pp.317.
• Patel R.M. and Deheri G.M. (2003): Magnetic fluid based squeeze film behavior between rotating porous circular plates with a concentric circular pocket and surface roughness effects. - Int. J. of Applied Mechanics and Engineering, vol.8, No.2, pp.271-277.
• Prajapati B.L. (1991): Behavior of squeeze film between rotating porous circular plates: Surface roughness and elastic deformation effects. - Pure and Appl. Math. Sci., vol.33, No.1-2, pp.27.
• Prajapati B.L. (1992): Squeeze film behavior between rotating porous circular plates with a concentric circular pocket: Surface roughness and elastic deformation effects. - Wear, vol.152, pp.301.
• Prajapati B.L. (1995): On certain theoretical studies in hydrodynamics and electromagnohydrodynamic lubrication, Dissertation. - Sardar Patel University, Vallabh Vidyanagar.
• Prakash J. and Tiwari K. (1982): Lubrication of a porous bearing with surface corrugations. - J. Lub. Tech., Trans. ASME, vol.104, pp.127-134.
• Prakash J. and Tiwari K. (1983): Roughness effects in porous circular squeeze-pates with arbitrary wall thickness. - J. Lub. Tech., vol.105, pp.90.
• Ting L.L. (1975): Engagement behavior of lubricated porous annular disks Part I: Squeeze film phase, surface roughness and elastic deformation effects. - Wear, vol.34, pp.159-182.
• Tonder K.C. (1972): Surface distributed waviness and roughness. - First World Conference in Industrial Tribology, New Delhi, A 3, pp.1-8.
• Verma P.D.S. (1986): Magnetic fluid based squeeze film. - International Journal of Engineering Sciences, vol.24, pp.395-401.
• Wu H. (1970): Squeeze film behavior for porous annular discs. - Trans. ASME vol.92, pp.593-596.
• Wu H. (1971): The squeeze film between rotating porous annular disks. - Wear vol.18, pp.461- 470.