A REDUCED-ORDER MODELING TECHNIQUE FOR MISTUNED BLADED DISKS

The analysis of the response statistics of mistuned turbomachinery rot ors requires an expensive Monte Carlo simulation approach. Simple lump ed parameter models capture basic localization effects but do not repr esent well actual engineering structures without a difficult parameter identification. Current component mode analysis techniques generally require a minimum number of degrees of freedom which is too large for running Monte Carlo simulations at a reasonable cost. In the present w ork, an order reduction method is introduced which is capable of gener ating reasonably accurate, very low order models of tuned or mistuned bladed disks. This technique is based on component modes of vibration found from a finite element analysis of a single disk-blade sector. It is shown that the phenomenon of mode localization is well captured by the reduced order modeling technique.