Application of inertial amplified acoustic metamaterial plate for noise reduction from urban electric substations
The noise generated by transformer,reactor and fan in urban electric substations has adverse effects on the routine life and work of surrounding residents.Aiming at the low-frequency noise reduction from urban electric substations,a plate adopting inertial amplification acoustic metamaterial(IAAMM)is proposed for being used to insulate the low-frequency noise from electric substations.To achieve the target,an analytical model is established for band-structure and vibro-acoustic characteristics of IAAMMs is established.On the basis of this model,parametric studies are performed to obtain the parameter regulation law(PRL)of the bandgaps of IAAMM plate.Finally experiments are conducted to verify the analytical model and also the obtained PRL.The results show that when the inertial amplification mechanism is added to the plate,the structure has a bandgap in the frequency bands of 132-450 Hz and 600-1409 Hz where the propagation of elastic wave can be significantly attenuated.Furthermore,the increase of span and inertia amplification angle of the IA mechanisms improve the sound insulation performance.These results are meaningful in providing the design guidance for IAAMM plates applied to low-frequency noise insulation from electric substations.
Acoustic metamaterialsInertial amplificationElectric power substationLow-frequency noiseSound transmission loss
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维普
