On the damping of vibrations by absorption materials placed between elastic stiffening ribs of a strip

The damping properties of a strip with periodic ribs, the spaces between which are filled by various vibration-damping materials and coatings are investigated experimentally. Absorption filters employing the oscillations of a fin have a resonance dependence of the damping coefficient on the frequency. When butyl rubber strips are cemented on the ribs the attenuation coefficient is as high as 4-5 dB per rib. A numerical investigation is carried out for a filter of a single rib with viscous friction at [one] end.