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Measurements of sound velocity dispersion on lubricants and estimation of volume viscoelasticity

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For obtaining dynamic properties of lubricants in EHL, an ultrasonic pulse wave apparatus was established and sound velocity in MHz frequency region was measured, and that in GHz requency region was also measured employing Brillouin scattering technique for several oils such as traction fluids up to 150 ℃ at atmosphere. GHz sound velocity was resulted to be larger than MHz one at 20 ℃ (frequency dispersion), and the difference decreased with temperature and vanished at 100 ℃. Bulk modulus dispersion), from sound velocity and its vanishing could he expressed by BEL viscoelastic model and by volume viscosity change with temperature. Rough estimation of bulk modulus under high pressure using BEL model, was appropriate for expressing transient region of the existing experimental data.

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