Abstract
The paper presents results of laboratory investigations of a vibrating three-layer cantilever beam with magnetorheological (MR) fluid. The goal of the study was to determine changes of the acoustic field around the vibrating beam caused by modifications of the MR fluid properties resulting from the changes of external magnetic field strength. The experimental studies have been carried out on a dedicated measuring stand. The construction of the measuring stand allows fixing one end of the beam in a clamp attached to the moving part of the electrodynamic actuator. The magnetic field is produced by an external electromagnet. During the measurements the beam displacements and the acoustic pressure have been simultaneously registered. Frequency analysis of the registered signals has been carried out in 1/12 octave bands near the second natural frequency of the beam. The measurement results indicate that there is a relationship between acoustic signal emitted by the vibrating beam and the strength of the magnetic field produced by the electromagnet.
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