Radial lip seals are used to prevent leakage between machine elements in many
industrial applications. During operation, fluid film between seal lip and shaft surface
generates a pressure distribution on the lip which is elastically deformed due to
hydrodynamic pressure. Surface roughness parameters in terms of moments of height
profile distribution (rms roughness, skewness and kurtosis) affect the rate of oil leakage.
A computer program is developed for elastohydrodynamic analysis of radial lip seals.
Both the fluid mechanics of the lubricating film and the elastic deformation of the lip are
taken into consideration to determine the hydrodynamic pressure distribution and the oil
flow through the seal lip. The effect of shaft surface roughness on hydrodynamic
analysis is taken into account by using average Reynolds equation with flow factors. For
non-Gaussian surfaces, the modified flow factors are used to investigate the effects of
skewness and kurtosis on the oil leakage. Numerical tests are performed for different
skewness, kurtosis and initial seal tightness values. Results show that when a seal is
mounted with a high initial tightness, the hydrodynamic pressure developed is not
enough to deform the lip to form a fluid film between the shaft and the seal lip. It is
observed that for the same rms roughness and skewness, the side flow rate increases as
the kurtosis value increases. However, for the same rms roughness and kurtosis values,
the side flow rate decreases for all skewness values.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12611842/index.pdf |
| Date | 01 April 2010 |
| Creators | Yildiz, Meltem |
| Contributors | Akkok, Metin |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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