In this paper, a combined approach to damage diagnosis of systems is proposed. The intention is to identify thenatural frequencies and the presence of damage. In a first step, the basic concept of the Hilbert HuangTransform is presented where the empirical mode decomposition is applied on the signal using a sifting processto obtain intrinsic mode functions exhibiting monocomponent behavior. In the next step, the Hilbert Transform isused to identify the frequencies from the well behaved ...