Figure 4

Flexural wave compression and amplification effects of the adaptive metamaterial based on analytical model.

(a) The flexural wave refractive index and corresponding cutoff frequencies of each unit cell along the adaptive GRIN metamaterial waveguide. (b) The compressed transverse displacement field along the adaptive waveguide at different frequencies. (c) The strain gain on the waveguide along the wave propagation direction for different frequencies. (d) The voltage gain in the sensors along the wave propagation direction for different frequencies. (e) The frequency spectra of the strain gain at different sensor locations on the metamaterial. (f) The frequency spectra of the voltage gain for different sensors on the metamaterial.