Abstract
Numerical methods were conducted to simulate the characteristics of SFD under different clearance, eccentricity and precession angular velocity and verified by bidirectional excitation experiments, which is comparatively leading initiative in characteristic measurement of SFD. In addition, finite difference method was introduced to derive Reynolds equation and SOR method to obtain the distribution of oil film, the convergence was also mathematical proof. The results indicate the rotor system keep large vibration state for a long time due to the increasing of actual critical speed of system, which result from the oil film stiffness increases nonlinear excessively with the increase of eccentricity; clearance make a great influence on SFD, especially SFD with large radial size should be kept within 2 ‰.
Highlights
Aero-engine structural faults are mostly result from vibration, which seriously affect the performance and endurance
Strong nonlinear were started to manifested in film force when eccentricity ≥ 0.3, which indicates when rotor passing through the critical state of system under large unbalanced response, it won’t pass fast and keep large vibration for a long time due to the increasing of actual critical speed of system which result from stiffness increases nonlinear excessively
Numerical and experimental search indicated that film stiffness and damping are reduced with increase of clearance, oil sealing and extrusion effect of dampers become weaker
Summary
Aero-engine structural faults are mostly result from vibration, which seriously affect the performance and endurance. Improving dynamic characteristics of the rotor-support system is a effective way to reduce the engine vibration [1, 2]. SFD (short for Squeeze Film Damper) has been widely used in aero-engines for stabilization and vibration control since its performance was convinced by Cooper in 1970s [3]. Well-designed SFD have been proven to have excellent damping performance, generally reduce vibration by more than 60 % [4, 5]. In order to explore dynamic characteristics of SFD of a certain aero-engine, difference method is used to simulate which verified by the bidirectional incentives experiment in this paper
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