SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS

A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 44, ISSUE 8 - April 21, 2006

07 AIRCRAFT PROPULSION AND POWER
Includes primary propulsion systems and related systems and components, e.g., gas turbine engines, compressors, and fuel systems; and onboard auxiliary power plants for aircraft.

For related information see also 20 Spacecraft Propulsion and Power; 28 Propellants and Fuels; and 44 Energy Production and Conversion.

20060010449 NASA Glenn Research Center, Cleveland, OH, USA

Dynamics of Orbital Masses in an Unbalanced Rotor

Gallardo, Vicente; Lawrence, Charles; February 2006; 14 pp.; In English; Original contains color and black and white illustrations Contract(s)/Grant(s): WBS 22-079-30-07 Report No.(s): NASA/TM-2006-214128; E-15462; Copyright; Avail.: CASI: A03, Hardcopy

Historically, orbital masses have been used as automatic balancers in rotating machines. However, in these applications, the masses are free to move and rotate with the rotor from zero to operating speeds. For gas turbine applications it is desirable for the orbital masses to be fixed and unmoving, until their release from a sudden unbalance at the operating speed, such as occurs from a blade-out event. The objective of this work is to develop the dynamical equations of motion for orbital masses on a rotating shaft. In subsequent work these equations will be incorporated into a rotor structural dynamics computer code and the feasibility of attenuating rotor unbalance response with orbital masses will be investigated. Author

Dynamic Structural Analysis; Rotor Dynamics; Turbomachinery; Dynamic Response; Rotating Shafts; Gas Turbines

Source: NASA