Experimentalinvestigation of cantilever beam vibration based on embedded particle dampers
Theoretical and experimental researches on embedded particle damper(EPD)damping method were carried out for vibration control of the cantilever beam structure.The finite element method was applied to analyze the vibration characteristics of the cantilever beam,and the vibration control experiments were carried out under the first,second and third order modal frequencies of the beam.By changing the parameters of the filled particles(particle size,filling rate)and the excitation force,the amplitudes of the cantilever beam under different filling conditions were compared,and the damping ratio was calculated using the half-power method.The discrete element method was used to analyze the rheological behavior of the particles in different cases to determine the optimal design parameters of the dampers.The results showed that:the best damping effect of EPD was achieved when the particle filling ratio was 90％;the particle size of the filled particles was related to the excitation of the system.In this model,when the excitation amplitude was 80 μm,the best effect was achieved when the beam was filled with 8,6,1 mm particles at these three modal frequencies,and the damping ratios were 47.5％,48.7％and 71.2％,respectively,and the damping ratios increased by 1.7,3.1 and 2.1 times,respectively.
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