Application of vibroacoustic metamaterials for broadband vibration reduction on space structures
* Presenting author
Abstract:
In this paper, vibroacoustic metamaterials are applied for launcher structural components made of composite materials to optimize their vibration transmission characteristics. For these applications the stopband behavior is desired in the frequency range up to 200 Hz and a broadband damping characteristics up to 500 Hz. Three configurations of two different concepts (pillar-type and beam-type resonators) are considered to fulfill the requirements on high damping and low additional mass to the component. Dispersion relations of the unit cells are calculated to predict the stopband region in an infinite compound. The resonators are designed and built to have their relevant out-of-plane resonance frequency at 160 Hz. The validated design of resonators is transferred to finite planar specimens made of carbon fiber reinforced polymers to evaluate the stop band behaviour of the vibroacoustic metamaterials. The expected dynamic behaviour is observed in the experimental investigation as well as in the simulation, thus proving the potential of the usage of vibroacoustic metamaterials for dynamically optimized launcher structures.