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- Lagerkvist, L., et al.
(författare)
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Mechanical impedance gauge based on measurement of strains on a vibrating rod
- 1982
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Ingår i: Journal of Sound and Vibration. - 0022-460X .- 1095-8568. ; 80:3, s. 389-399
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Tidskriftsartikel (refereegranskat)abstract
- An impedance gage based on measurement of strains at two different cross-sections of a vibrating rod is analyzed and tested. The gage rod, which may have variable characteristic impedance, is in contact with the object at one end and is driven by a harmonic vibrator at the other end. For conical and cylindrical rods explicit relations between point impedance and measured strains are derived. For a cylindrical gage rod of steel with length 800 mm, diameter 10 mm, and distance between strain gages 250 mm a fair agreement was generally obtained between experimental and theoretical point impedances of cylindrical test objects in the frequency range 50 Hz to 1. 7 kHz. Significant improvements in accuracy over that of the tested prototype are expected to be feasible
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