IDENTIFICATION TECHNIQUES OF STRUCTURE CONNECTION PARAMETERS USING FREQUENCY-RESPONSE FUNCTIONS

The identification method for stiffness constant parameters and dampin g coefficient parameters of connections using test data is derived whe n a structure is attached to another structure via connections. Becaus e of the inherent difficulties of deriving spatial models from test da ta, the frequency response function (FRF) is used as a response model. The identification method using the FRFs works for each discrete freq uency so that the connection properties can be found for each frequenc y and can be averaged using statistical methods for an accurate identi fication. If highly sensitive regions are excluded, this identificatio n method for connection using FRFs gives accurate estimations and can be applied to a general structure in an easier manner than the modal m odel methods which require a mathematical model of the mass, damping a nd stiffness matrices (or natural frequencies and mode shapes). (C) 19 98 Academic Press Limited.