Abstract
This study assumes the data measurement at the time of the true operation and is a thing for the non-linear vibration system to receive random input. Harmonic content occurred due to a non-linear characteristic and clarified it by higher order spectra analysis about the main resonance and the subsidiarity of main frequency ingredient intervals. In addition, in numerical simulation, I showed that it was effective as technique of being the estimate that was the robust method in the additive noise and the non-linear linear identification. Finally, I clarified that it was possible for identification to be right without making a wrong decision by using a by spectrum about 2 dof linear vibration system that the natural frequency ratio became at 1:2.
