Results 131 to 140 of about 249 (182)

A Numerical Study of Squeeze Film Dampers

Volume 7B: Structures and Dynamics, 2013
Squeeze film dampers (SFDs) are used in the high speed turbomachinery industry as a means to reduce vibration amplitude, provide damping, and improve dynamic stability of the rotor bearing system. Past numerical studies analyzing SFDs, have been computationally expensive and time consuming.
Praneetha Boppa, Gerald L. Morrison, Aarthi Sekaran   +2 more
openaire   +1 more source

Transitions to chaos in squeeze-film dampers

Communications in Nonlinear Science and Numerical Simulation, 2006
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Inayat-Hussain, Jawaid I., Mureithi, Njuki W.   +1 more
openaire   +3 more sources

Eccentric Operation of the Squeeze-Film Damper

Journal of Lubrication Technology, 1978
The squeeze-film damper, undergoing a whirl orbit as may be caused by rotor unbalance, resists eccentricity of the whirl orbit with a static stiffness which is proportional to the dynamic force carried by the squeeze-film. In addition, the fluid film force would develop nonsynchronous components.
Coda H. T. Pan, Jorgen Tonnesen
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Equivalent Linearization of a Squeeze Film Damper

Journal of Vibration and Acoustics, 1986
In this paper, the equivalent linearization of an intershaft squeeze film damper in a two shaft engine system is investigated. The two shaft centers at the damper position are assumed to move in different elliptical offset orbits and at synchronous frequency with the unbalanced rotor (e.g., the high pressure rotor).
Songqi Chen, Shengpei Liu
openaire   +1 more source

Squeeze Film Dampers: Amplitude Effects at Low Squeeze Numbers

Journal of Engineering for Industry, 1975
Gaseous squeeze film dampers are analyzed to determine the effect of periodic disturbance amplitude on the dynamic performance. Both circular and rectangular parallel surfaces are investigated. A solution of the nonlinear Reynolds equation is obtained by expanding the pressure in powers of the squeeze number σ, retaining up to and including terms 0(σ2).
A. Kent Stiffler, Martin H. Sadd
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Effect of Squeeze Film Damper Land Geometry on Damper Performance

Tribology Transactions, 1994
Variable axial land geometry dampers can significantly alter the unbalance response, and in particular, the likelihood of undesirable jump behavior, of circular orbit-type squeeze film dampers. Assuming end feed, the pressure distribution, the fluid film forces, and the stiffness and damping coefficients are obtained for such variable axial land ...
Y. H. Wang, E. J. Hahn
openaire   +1 more source

The conceptual design of the squeeze film damper and variable structure damper

2013 IEEE International Symposium on Assembly and Manufacturing (ISAM), 2013
The Squeeze film damper has been extensively researched for engineering application. The conceptual design work in this article includes the description, induction and classification of the squeeze film damper structure, and a brief analysis of the structural features and performance characteristics.
null Runlin Chen, null Wu Ouyang, null Jimin Xu, null Xiaoyang Yuan, null Yan Li   +4 more
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Experimental Pressures and Film Forces in a Squeeze Film Damper

Journal of Tribology, 1993
The effect of whirl frequency and lubricant viscosity on the dynamic pressures and force response of an open end and a partially sealed squeeze film dampers (SFD) with a radial clearance of 0.38 mm is determined experimentally. The experiments are carried out in a damper test rig executing circular centered orbits and for whirl frequencies ranging from
G. L. Arauz, L. A. San Andres
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Modeling Finite Squeeze Film Dampers

Volume 4: Turbo Expo 2002, Parts A and B, 2002
Most closed form solutions of Reynolds’ equation assume either a short bearing approximation or a long bearing approximation. These closed form approximations are used in rotordynamic simulation applications, otherwise a Finite Difference solution of Reynolds’ equation would be prohibitively time consuming.
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Sealing Effect on the Performance of Squeeze Film Damper

Volume 3: Heat Transfer, Parts A and B, 2009
Seals used in the squeeze film damper restrict the side leakage of the lubricant, thus providing a measure of additional damping. In this paper, the serrated piston ring and end-plate seals are studied numerically using CFD-ACE+, a commercially available finite volume based algorithm.
Changhu Xing, Minel J. Braun, Hongmin Li
openaire   +1 more source