Experimental Investigation of a Mechanical Impedance Gauge Based on Measurement of Strains on a Conical Rod

摘要

A gage used to measure the mechanical point impedance of linear systems under harmonic excitation is described. Strain measurements are made at two different cross-sections of a conical gage rod. The gage rod is in contact with the object at its narrow end while its wide end is driven by a harmonic vibrator. The length of the gage rod is 260 mm and its end diameters are 9.8 mm and 20.1 mm. For cylindrical test objects a fair agreement is obtained between experimental and theoretical point impedances in the frequency range 50 Hz to 5 kHz.