The self-oscillations using for the flaw detection of the heat-stressed equipment

Abstract

The nondestructive inspection method is presented for the constructional elements which can't be directly accessed. The method uses the construction self oscillations which are exited by a special striker in some certain places. The method represents some schema of
the places to strike and of the vibrational measurements, it also allows to define the frequency distribution over the ranges and to build the self-oscillation frequency spectrum limited by the number of frequency ranges. The self-oscillation frequency distribution in the spectrum can be used to determine the state of the investigated construction element. The experimental results obtained by the developed method are given for the internal cases
of eight injector heads. Ill. 3. Ref. 7.