Abstract
We report on the dynamic behavior of a rotary lip seal by considering the interaction between lip, film and shaft roughness assumed to have a periodic form. The nonlinearities of stiffness and viscosity of the film are taken into account in a mass-spring-dumper model. Using the harmonic balance method, analytical prediction of the lip displacement is obtained, the frequency response is provided and the effect of the shaft undulation on the amplitude jumps of the lip displacement and on the film thickness fluctuations are discussed. The results have direct applications in reducing leakage that may occur between a smooth lip seal and a rough shaft.
Highlights
Lip seal device is the simplest and most widely used for sealing rotating shafts
We propose an analytical study on the dynamic of lip seal and squeezed film in interaction with rotating rough and rigid shaft, by considering a massspring-dumper model and taking into account the hydrodynamic behavior of the thin film and the dissipative characteristic of the seal
In order to characterize the viscoelastic law of the rotary lip seal, we propose to simulate the dynamic behavior by adopting “Proney” Series as described in [1], using Finite Element Analysis (FEA) (Figure 1)
Summary
Lip seal device is the simplest and most widely used for sealing rotating shafts. Its role is to prevent leakage without causing wear. An original study that addresses the dynamic of the lip seal was proposed in [1], showing a high correlation between the viscoelastic behavior of the material and the creation of the thin film. This approach is based on resolving Reynolds equation, coupled with lip mechanical behavior, by using Finite Element Analysis (FEA). We propose an analytical study on the dynamic of lip seal and squeezed film in interaction with rotating rough and rigid shaft, by considering a massspring-dumper model and taking into account the hydrodynamic behavior of the thin film and the dissipative characteristic of the seal. By assuming the rotary lip seal as a short bearing, the condition of squeeze film between the shaft and the seal can be reformulated, and the equivalent stiffness and damping coefficients to squeezed film can be determined [2,3]
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