Dynamic stiffness and damping of externally pressurized gas lubricated journal bearingsA rigid vertical shaft was operated with known amounts of unbalance at speeds up to 30,000 rpm and gas supply pressure ratios to 4.8. From measured amplitude and phase angle data, dynamic stiffness and damping coefficients of the bearings were determined. The measured stiffness was proportional to the supply pressure, while damping was little affected by supply pressure. Damping dropped rapidly as the fractional frequency whirl threshold was approached. A small eccentricity analysis overpredicted the stiffness by 4 to 55 percent. Predicted damping was close to measured at low speeds but higher at high speeds
Document ID
19770040643
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Fleming, D. P. (Army Air Mobility Research and Development Lab. Cleveland, OH, United States)
Thayer, W. J. (Army Air Mobility Research and Development Lab. Cleveland, OH, United States)
Cunningham, R. E. (NASA Lewis Research Center; U.S. Army, Air Mobility Research and Development Laboratory, Cleveland Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
October 1, 1976
Subject Category
Mechanical Engineering
Report/Patent Number
ASME PAPER 76-LUB-33
Meeting Information
Meeting: Joint Lubrication Conference
Location: Boston, MA
Start Date: October 5, 1976
End Date: October 7, 1976
Sponsors: American Society of Mechanical Engineers