Equivalent linearization of a squeeze film damper

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · J. Vib. Acoust. Stress Reliab. Des.; (United States)

DOI:https://doi.org/10.1115/1.3269367· OSTI ID:6812652

Chen, S; Liu, S

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). The nonlinear damper force is resolved into two orthogonal components along the absolute coordinate directions and, in turn, each of these force components is supposed to be equivalent to the sum of an average force, a linear spring force, and a linear damping force in the corresponding direction. By using the method of equivalent linearization by harmonic balance, the six parameters of the equivalent forces, including two average forces, two equivalent spring coefficients, and two equivalent damping coefficients, are expressed analytically by the squeeze film forces and the assumed orbital motion of the two shaft centers at the damper position. 10 references.

• OSTI ID: 6812652
• Journal Information: J. Vib. Acoust. Stress Reliab. Des.; (United States), Journal Name: J. Vib. Acoust. Stress Reliab. Des.; (United States) Vol. 108; ISSN JVADD
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
ANALYTICAL SOLUTION
CONTROL EQUIPMENT
DRAFT CONTROL SYSTEMS
ENGINES
EQUIPMENT
FLOW REGULATORS
GAS TURBINE ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
NONLINEAR PROBLEMS
ROTORS