Vibration attenuation of finite-size metaconcrete: Mechanism, prediction and verification

Abstract To mitigate shock and vibration, metaconcrete with single-mass-coating resonators and double-mass-coating resonators was designed based on local resonance mechanism. The resonator is constructed by metallic ball coated with thin and soft rubber layer. Dynamic analysis method for finite-size metaconcrete is developed to predict the effective bands for vibration attenuation, which is verified by frequency-sweeping vibration experiment. Local resonance of the mass-coating system endows finite-size metaconcrete excellent vibration attenuation ability at the desired frequency band. Having two local resonation frequencies, double-mass-coating system effectively expands the vibration attenuation band from one to two and much wider compared with single-mass-coating system. The finite-size metaconcrete block designed in this research can dissipate 56.4% more energy than the common concrete block.