Sage Journals: Discover world-class research

Abstract

Squeeze film dampers are widely used technical components for turbomachinery as a means to reduce the amplitude of rotor vibration owing to unbalance. This article proposes a different type of circular damper using highly compressible porous layers (HCPL) imbibed with Newtonian liquids. The elastic forces of the HCPL solid phase are negligible compared to the hydrodynamic forces generated within the porous layer. Such processes were named ex-poro-hydrodynamic (XPHD). The Kozeny–Carman equation was used to compute permeability in function of porosity/compacticity. Analytical and numerical solutions were performed for the impact process of the partial and full narrow circular dampers in XPHD conditions. The results were compared with the case of the classical squeeze film damper. The damping capacity of a HCPL imbibed with Newtonian liquid was found to be considerably greater than that of the Newtonian liquid layer.

Keywords

circular damper porous medium compliant layer damping capacity

Get full access to this article

View all access options for this article.

References

Pascovici, M. D. Lubrication by dislocation: a new mechanism for load carrying capacity. In Proceedings of the Second World Tribology Congress, Vienna, 3–7 September 2001, p. 41 (available on CD-ROM).

Pascovici

M. D.

Cicone

Marian

Squeeze process under impact, in highly compressible porous layers, imbibed with liquids. Tribol. Int., 2009, 42, 1433–1438.

Han

Weinbaum

Spaan

J. A. E.

Vink

Large-deformation analysis of the elastic recoil of fiber layers in a Brinkman medium with application to the endothelial glycocalyx. J. Fluid Mech., 2006, 554, 217–235.

Pascovici, M. D. Lubrication of red blood cells in narrow capillaries. A heuristic approach. In Proceedings of the Second Vienna International Conference on Micro- and nano-technology, Wien, 14–16 March 2007, pp. 95–100.

Pascovici

M. D.

Cicone

Squeeze-film of unconformal, compliant and layered contacts. Tribol. Int., 2003, 36, 791–799.

McCutchen

C. W.

The frictional properties of animal joints. Wear, 1962, 5, 1–17.

Feng

Weinbaum

Lubrication theory in highly compressible porous media: the mechanics of skiing, from red cells to humans. J. Fluid Mech., 2000, 422, 281–317.

Popescu

C. S.

Marian

Pascovici

M. D.

Experimental and theoretical analysis of the permeability for highly compressible porous layers. J. Balkan Tribol. Assoc., 2009, 15(1), 86–92.

Scheidegger

A. E.

The physics of flow through porous media, third edition,, 1974 (University of Toronto Press, New York).

10.

Pascovici

M. D.

Popescu

C. S.

Marian

Impact of a rigid sphere on a highly compressible porous layer imbibed with a Newtonian liquid. Proc. IMechE, Part J: J. Engineering Tribology, 2010, 224, 789–795.

11.

Della Pietra

Adiletta

The squeeze film damper over four decades of investigations. Part I: characteristics and operating features. Shock Vib. Digest, 2002, 34(N1), 3–26.

12.

Ghaddar

C. K.

On the permeability of unidirectional fibrous media: a parallel computation approach. Phys. Fluids., 1995, 7(N11), 2563–2586.

13.

Booker

J. F.

Dynamically loaded journal bearings: mobility method solution. Trans. ASME J. Basic Eng., 1965, 87, 537–546.

14.

Bowden

F. P.

Tabor

The friction and lubrication of solids, 1950 , 259–284 (Clarendon Press, Oxford).

15.

Knox

L. D.

Squeeze film forces in a magnetic shaft suspension system. Trans. ASME J. Tribol., 1984, 106, 473–476.

16.

Cameron

Principles of lubrication, 1967 (Wiley, New York).

17.

Pascovici, M. D. Procedure and device for pumping by fluid dislocation. Romanian Patent 109469, 1994 [in Romanian].

18.

Mirbod

Andreopoulos

Weinbaum

On the generation of lift forces in random soft porous media. J. Fluid Mech., 2009, 619, 147–166.

19.

Andreopoulos

Weinbaum

From red cells to snowboarding: a new concept for a train track. Phys. Rev. Lett., 2004, 93(19), 194501–194504.

Squeeze processes in a narrow circular damper with highly compressible porous layer imbibed with liquids

Abstract

Keywords

Get full access to this article

References