This research direction is related to of methods for damage identification method in different type of engineering structures. The Institute’s main focus is on the development of vibration–based damage identification methods for detection and localization of damage as well as for evaluation of damage severity in various structural elements. Required dynamic parameters of the structure – vibration frequencies and vibration mode shapes – are obtained by means of scanning laser vibrometer or by accelerometers and strain gages. The developed methods have proven to be reliable tool for damage identification of structural damage invisible from the outside in different types of structural elements. Damage indices are generalized for 1-dimensional and 2-dimensional space thus enabling damage identification in beam-type, plate-type and sandwich-type structural elements.