Patent ID: 6848311
Filing Date: 2005-02-01
Classification: G01M

Abstract:
1. A method to measure the complex frequency-dependent dilatational and shear wavenumbers of a material under a static compressional force comprising the steps of: subjecting the material to a compressional load; vibrating the material in a vertical direction at a range of test frequencies; measuring a first set of material motion parameters for each frequency in the range while the material is vibrating in the vertical direction; vibrating the material in a horizontal direction at the range of test frequencies; measuring a second set of motion parameters for each frequency in the range while the material is vibrating in the horizontal direction; obtaining a dilatational wavenumber by utilizing said measurement of motion parameters obtained while said material was vibrating in the vertical direction; obtaining a shear wavenumber by utilizing said measurement of motion parameters obtained while said material was vibrating in the horizontal direction; and calculating material parameters from known material properties and a selected one of the shear wavenumber, dilatational wavenumber, and both wavenumbers at each test frequency.