INFLUENCE OF VARIATIONS IN LOSS FACTOR OF A PANEL AND LINE IMPEDANCESOF ATTACHED RIBS

This is a companion paper to a preceding paper entitled: ''Quadratic a nd energy estimates of the partial response of ribbed panels'' [J. Dic key and G. Maidanik, J. Acoust. Soc. Am. 94, (1993)]. A ribbed panel i s used as a complex structure in which the bays form an ensemble of co upled dynamic systems which can be made identical. In the companion pa per a quadratic analysis (QA) is employed to yield the quadratized lin ear response of a ribbed panel which is then compared with the respons es that are yielded by an energy analysis (EA) and a statistical energ y analysis (SEA). The comparison is extended herein to include variati ons in the loss factor of the panel and in the line impedance of the r ibs. It is found that such variations may significantly influence the quadratic (global) and the energy (local) responses of a ribbed panel as well as the correspondence between these types of responses.