The possibility of shifting the resonant frequencies magnetically active elastomer

\nA sample of magnetically active elastomer composite material under the influence of external loads is experimentally studied to determine the possible ranges of resonance frequency shift. To record the experimental dynamic characteristics, a complex of vibration test equipment is used, which includes various types of equipment ensuring the operation of the vibration test bench in a given frequency range. In the investigated range the method of smooth frequency sweep of sinusoidal oscillations is used. Signals received from vibration sensors (piezoelectric accelerometers) installed on the specimen are transformed, recorded, processed by software and displayed on the computer screen. Different methods of loading the specimen are used for the determined ranges of resonance frequency locations. One of the loading methods used is a weight with a mass attached to the specimen. Another variant of loading was the effect of magnetic forces on the sample. According to the results of the conducted tests, after processing the obtained experimental data, the shifts of resonance frequencies were recorded and the amplitude-frequency characteristics were plotted, showing the ranges of shift or displacement of resonance frequencies in the investigated material. Under the influence of the considered external loads applied to the tested material, the oscillograms of acceleration of the specimen show the shift of resonance frequencies to the low-frequency range by more than three times and the shift of resonance frequencies to the high-frequency range by two times. The obtained results show additional possibilities of application of different modes in solving the problem of control of dynamic and antivibration properties of the tested material by shifting of resonance frequencies.\n