Circular and prizmatik machine part of the one that is crack size experimental modal analysis method with determine

In this study, the vibration on the work piece is measured with the experimental modal analysis. Frequency dependent graphs were obtained from measurements of vibration. This graphs are called (FRF) response frekans function. Resonans frequencies, damping ratio, and mode shapes were obtained.Two work piece types are used. First one is diametrical, the second one is quadrical. Each type is one normal and one cracked. The frekans graphs of the work piece wasn?t the same. Resonans frequencies of cracked parts are smaller and at the same time magnitude values are low too.Frequency , damping ratios of important parts on desing are also calculated numerical.