Abstract
Acoustic performance of an absorber without perforating holes, overlapping micro-gapped strips (OMGS), is studied in this paper. OMGS is made by overlapping and staggering two layers of plates, each layer of which is constituted by arranging an array of strip-shaped sheets separated by a micro gap. Micro slits are formed between those strips and the upper layer of slits intersects with the lower one forming micro apertures. The aperture sandwiched between the slits is just a layer of cross profile with zero geometrical thickness. Thermoviscous acoustic simulations of OMGS demonstrate the distribution of the pressure, velocity, and power dissipation at the cross profile and along the axial direction of the aperture. Empirical impedance correction models for the cross profile are proposed based on numerical simulations. Experimental examples validate that the proposed models offer an accurate prediction for the acoustic impedance and sound absorption coefficients of OMGS.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call