Bandgap mechanism and vibration reduction property of wave-resistance sleeper with negative effective mass density

Based on the capability of controlling low-frequency elastic waves in solids with subwavelength size, locally resonant phononic crystals have potential applications track vibration reduction. By periodically embedding 3D unit cells (LRUCs) a concrete matrix, wave-resistance sleeper negative effective mass density is proposed, and generation mechanism bandgap parameter sensitivity are studied. Furthermore, mitigation performance applied to ballastless analyzed. The results show that local resonance LRUC responses excitation, generated this frequency range. changing modulus coating or core density, boundary frequencies can be effectively adjusted, bandwidth expanded by increasing ratio radius thickness, filling fraction, adopting thinner steel spherical shell. was verified test results. mechanism, prohibit vibrations at multiple design from transmitting bed.