The present paper examines the effect of a concentrated damage in elastic frames with reference to the variation induced in the natural frequencies of vibration. First the direct problem for both undamaged and damaged frames is studied and some important considerations on the number of frequencies required in order to evaluate two damage parameters, i.e location and intensity of the damage, are outlined. Second, an identification procedure based on the response comparison is presented. An optimal estimate of the parameters is obtained by minimizing an appropriate objective function which is defined as the sum of the squares of the differences between the analytical and measured variations of frequencies between the undamaged and the damaged state. Different damage configurations are considered to assess its reliability.
The dynamic stiffness method for detection of concentrated damages in elastic frames
GRECO, Annalisa;
2009-01-01
Abstract
The present paper examines the effect of a concentrated damage in elastic frames with reference to the variation induced in the natural frequencies of vibration. First the direct problem for both undamaged and damaged frames is studied and some important considerations on the number of frequencies required in order to evaluate two damage parameters, i.e location and intensity of the damage, are outlined. Second, an identification procedure based on the response comparison is presented. An optimal estimate of the parameters is obtained by minimizing an appropriate objective function which is defined as the sum of the squares of the differences between the analytical and measured variations of frequencies between the undamaged and the damaged state. Different damage configurations are considered to assess its reliability.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
