TY JOUR TI Assessment of the Effect of Under-Ballast Mats on Vibration Reduction KW vibration KW under-ballast mats KW vibrodynamic impact KW insertion loss KW vibration transmissibility KW complex dynamic stiffness KW impedance KW damping KW vibration table JO Bulletin of scientific research results AU Maslov, N.K. AU Petryaev, A.V. AU Saydaliev, A.A. PY 2026 IS 2026 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"