The paper presents parameter identification measurements conducted on a squeeze film damper (SFD) featuring a nonrotating mechanical seal that effectively eliminates lubricant side leakage. The SFD-seal arrangement generates dissipative forces due to viscous and dry-friction effects from the lubricant film and surfaces in contact, respectively. The test damper reproduces an aircraft application that must contain the lubricant for extended periods of time. The test damper journal is in length and in diameter, with a nominal clearance of . The damper feed end opens to a plenum filled with lubricant, and at its discharge grooved section, four orifice ports evacuate the lubricant. In earlier publications, single frequency force excitation tests were conducted, without and with lubricant in the squeeze film land, to determine the seal dry-friction force and viscous damping force coefficients. Presently, further measurements are conducted to identify the test system and SFD force coefficients using two sets of flow restrictor orifice sizes ( and in diameter). The flow restrictors regulate the discharge flow area and thus control the oil flow through the squeeze film. The experiments also include measurements of dynamic pressures at the squeeze film land and at the discharge groove. The magnitude of dynamic pressure in the squeeze film land is nearly identical for both sets of flow restrictors, and for small orbit radii, dynamic pressures in the discharge groove have peak values similar to those in the squeeze film land. The identified parameters include the test system damping and the individual contributions from the squeeze film, dry friction in the mechanical seal and structure remnant damping. The identified system damping coefficients are frequency and motion amplitude dependent due to the dry-friction interaction at the mechanical seal interface. Squeeze film force coefficients, damping and added mass, are in agreement with simple predictive formulas for an uncavitated lubricant condition and are similar for both flow restrictor sizes. The SFD-mechanical seal arrangement effectively prevents air ingestion and entrapment and generates predicable force coefficients for the range of frequencies tested.
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July 2008
Research Papers
Squeeze Film Damper With a Mechanical End Seal: Experimental Force Coefficients Derived From Circular Centered Orbits
Luis San Andrés,
Luis San Andrés
Mast-Childs Professor
Fellow ASME
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843
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Adolfo Delgado
Adolfo Delgado
Research Assistant
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843
Search for other works by this author on:
Luis San Andrés
Mast-Childs Professor
Fellow ASME
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843
Adolfo Delgado
Research Assistant
Mechanical Engineering Department,
Texas A&M University
, College Station, TX 77843J. Eng. Gas Turbines Power. Jul 2008, 130(4): 042505 (8 pages)
Published Online: April 29, 2008
Article history
Received:
May 10, 2007
Revised:
June 6, 2007
Published:
April 29, 2008
Citation
Andrés, L. S., and Delgado, A. (April 29, 2008). "Squeeze Film Damper With a Mechanical End Seal: Experimental Force Coefficients Derived From Circular Centered Orbits." ASME. J. Eng. Gas Turbines Power. July 2008; 130(4): 042505. https://doi.org/10.1115/1.2800345
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