Composite beam´s parameters identification based on frequency response

The subject of the study is a modelling of composite cantilever beam. The beam comprises two elastic outer layers made of aluminium and a magnetorheological (MR) fluid layer in between, sealed with silicone rubber. Data for identification were collected by testing the forced vibration of the beam. One of the beam ends was clamped in a holder located at the moving part of the electrodynamic shaker. The motion of the beam was controlled by the magnetic field which activates the MR fluid. The beam vibrations were measured in two points. The first point was placed at the clamped end of the beam while the second point was located at the free end of the beam. The frequency response function of the investigated object was the base for identification procedures. The proposed model was limited to the first two modes of vibrations of considered beam. Two identification procedures were discussed.