Abstract: Using the adjustable and controllable characteristics of MRE (magnetorheological elastomers) under the action of applied magnetic fields， the structural support which takes MRE as the main elastic component was designed， and the cantilever beam’s impact fault experimental system with harmonic excitation was established based on the mode of shear force. Then， the experimental tests of vibration response under the action of control currents with different applied magnetic fields were carried out， and the performances of frequency shift and amplitude reduction of the system as well as the vibration response under the condition of impact were analyzed. The results showed that the stiffness of MRE is increased effectively with the control current， the controllability of natural frequency and amplitude of the system is then realized， and the severity of impact fault becomes controllable and the equipment life is thereby improved.

Key words: cantilever beam, MRE (magnetorheological elastomers), impact, frequency shift, amplitude reduction