Abstract
This paper proposes a method for estimating auto FRF (frequency response function) using additional masses. In FRF measurement, impact hammer are generally used to measure the excitation force to structure, but the case of object's shape is complex, actual user often can't measure auto FRF. In the proposal method, inertia force of additional mass is presumed external forces. In this paper, accuracy of the method is validated by applying it to a beam structure if case auto FRF is unmeasured at some point.
