Adaptive Method for Tuning Dynamic Properties of Beams by Means of Particles Redistribution |
| M. Żurawski, R. Zalewski
Warsaw University of Technology, 02-524 Warsaw, Poland |
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| The paper concerns problems related to controlling the properties of vibrating slender elements. The main mechanism that influences global mechanical features of the system is redistribution of the grains located inside the considered element. The dynamic properties of the investigated system can be controlled by external factors resulting in partial changes in grains redistribution. An application of special pneumatic system allows to change either stiffness or mass distribution (density) of the beam. Original experimental results are presented in the paper. It is confirmed that there is a significant and direct connection between the granular mass distribution and the dynamics of the system. The spectral vibration analyses were carried out for various particles redistribution cases. Additionally an initial approach to the modeling process is introduced. The continuous model of cantilever beam has been simplified to a discrete multi DOF system. The verification of experimental and numerical data revealed the satisfactory convergence. It is confirmed that there is a possibility to find such parameters of the system which allow to avoid dangerous resonant frequencies. |
DOI:10.12693/APhysPolA.138.240 topics: Damping of vibrations, mass redistribution, cantilever beam, Particles Impact Beam |