“…Mathematically, the optimization problem for minimizing magnitudes of deflections can be written as finding minimum of the following target function F: min C1,ρ1,l1,h1 where C 1 , ρ 1 , h 1 , and l 1 are the elasticity tensor, density, depth, and length of the barrier (in the case of isotropic material, Lamé constants can be used instead of the elasticity tensor), ω is the angular frequency, Ω is a spectral set, s(ω) is the corresponding spectral density, D denotes the protected zone (plane region), and m is the magnitude of deflections in the protected zone. This problem resembles Advances in Acoustics and Vibration 7 one that is usually solved at finding optimal parameters of shock absorbers [51][52][53].…”