Analysis and experimental study on vibration attenuation characteristics of periodic reactor barriers for Rayleigh waves
The vibration attenuation mechanism and effect within the attenuation zone were studied to reveal the vibration characteristics of Rayleigh waves in periodic reactor barriers and realize the effective attenuation of low-frequency surface waves.First,a transmission model was established to determine the appropriate geometry dimensions of the reactor barriers.Next,the action rule and attenuation effect of the vibration wave under the influence of height and elastic modulus were analyzed based on the complex dispersion and frequency domain curves.Finally,the scaling frequency sweep test was carried out to obtain the acceleration data in the X and Z directions.This data was further compared with the complex frequency dispersion curves to study the vibration attenuation mechanism of each attenuation zone.It is shown that the attenuation zones in the X and Z directions are inconsistent,and the attenuation zones in different directions are the same as the action wave mode in the attenuation zone for the complex dispersion curve.Besides,a low-frequency attenuation zone will appear in the X direction,and the attenuation trend will appear in the Z direction when the second attenuation zone terminates.It is further demonstrated that the period reactor barriers can excite the horizontal polarization resonance attenuation zone and the Bragg scattering attenuation zone.Height is an essential factor affecting the pseudo-surface waves.When the height is high,generating pseudo-surface waves is accessible in the first attenuation zone.When the height is low,generating pseudo-surface waves in the second attenuation zone is easy.The elastic modulus is an essential factor affecting high-speed pseudo-surface waves.When it reaches the unit magnitude of the concrete elastic modulus(10 GPa),the action range of the high-speed pseudo-surface wave may appear in the third attenuation zone.Otherwise,it will directly enter the SV wave and P-wave coupling mode.The research results will further enlighten the field of environmental vibration isolation to use surface wave blocks to reduce vibration.
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