In recent literature, attempts have been made to apply Independent Component Analysis (ICA) techniques to the modal identification problem. Paramount to this task is establishing a relationship between the source components realized using the suggested ICA technique and modal responses. In this paper, the relationship between independent components and free-vibration modal responses is discussed. Theoretical arguments are presented for responses of undamped systems and arguments are extended to damped responses.
McNeill, S. and Zimmerman, D., “Relating Independent Components to Free-Vibration Modal Responses,” Shock and Vibration Journal 17(2),161-170, 2010.