Abstract
Uncertainties during the manufacturing process or due to unexpected load variations in the course of operation can cause damages or faults in structures. These deviations from the original or intended properties can impact the durability and the application for the component. Destructive testing methods are often impractical since the investigated component becomes unfeasible. Instead, a non-destructive testing method, which is based on the change of the dynamic behaviour caused by the faults in the structures, allows examining the produced or built-in component. Experimental investigation of the changes can be employed to detect and quantify the damages to some extent, if the relationship between the properties and the damage is not known. The non-destructive vibrational testing methods, in particular, are based on the relation between the material properties of a structure and its measured vibrational behaviour, e.g. natural frequencies and mode shapes.
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