Abstract
The paper presents a practical fault detection method for dynamical systems with some arbitrary and nonstationary inputs. The method implies an impulse invariant transformation for obtaining the equivalent system having as input a stationary uncorrelated sequence, and as output the response for this input. The transformation uses the AR filters of the quasi-stationary data blocks of the original input, resulted by a segmentation procedure. A similar procedure is used to segment the processed output in quasi-stationary data blocks. Each transition from one data block to another marks a change in the dynamic properties of the system. The method is applied for detection of changes in dynamic characteristics of a vibrating structure subject to a transient natural excitation.
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