Abstract: rithm (ERA)and Ibrahim Time-Domain Method(ITDM), a Time-Domain Average Method for identifying modal parameter with impulsive response is presented in this paper. The advantage of this method is that it has combined the advantages of ERA and ITDM,i.e.the measuring data is correlatively filted after being averaged in time-domain. Hence, it can be used to treat the cases of lower signal to noise ratio.

Key words: modal parameter identiiication time-domain average, vi-bration system