Vibrational power flow analysis of damaged beam structures

In view of structure-borne sound, vibrational power flow analysis is invest igated for damaged beam structures. In this paper, the damage is modelled a s a joint of a local spring. The damage point transfer matrix and the beam element transfer matrix are deduced, then the relations of the vibrational power flow, the position and the characteristic size of the damage are obta ined combined with periodic structure theory. Based on the theoretical anal ysis and measurement results, the damage can be diagnosed in the next work. (C) 2001 Academic Press.