Improved method for estimation of complex modulus and damping

摘要

This paper introduces an improved method for estimation af Complex Modulus as a continous function of frequency. The classical method can nomally be used up to a frequency which is a factor of 2 to 3 below the first resonant frequency for the testsetup. For the proposed improved method the frequency range is extended to well above the first resonant frequency for the testsetup. The method is verified by use of the well known 3 dB bandwidth method.