A model of periodic ring-stiffened cylindrical shell was designed, and the experiment on the vibrational power flow from the model excited by an outer force was accomplished.

The method of weakening centrifugal force in the rotary ring flume is proposed and sediment movement under the effect of periodic reciprocating current is tested in the ring flume.

In the structure, etching the periodic holes around the waveguide of the ring resonator waveguide does not increase the size of the CROW.