Experimental verification of an algorithm for identification of linear time-varying systems

Experimental verification of an algorithm for identification of linear time-varying (LTV) systems, subject to initial disturbance, was presented. The algorithm was found to be capable of identifying the first three pseudo-natural frequencies. It was observed that the responses under retraction motion are richer in modal information and sustain a longer period than those under extension motion. It was revealed that as free responses decay quickly, the quality of identification deteriorates with an increase of time if the system response is not persistently exciting as the case of an axial extension.