Multi-chamber micro-perforated panel absorbers optimised for high amplitude broadband absorption using a two-point impedance method
نویسندگان
چکیده
An optimised, multi-chamber, micro-perforated panel absorber (MC-MPPA) with adjoining panels is presented in this paper. MPPA a clean and efficient noise simple structure making it an increasingly popular choice over porous material-based solutions. For the basic configuration, bandwidth typically limited by perforation size frequency range backing cavity depth. In order to improve these parameters, innovative variations of have been proposed literature, but development solution which delivers both broadband response at low frequencies, shallow has yet appear. This paper proposes such technological breakthrough employing graph-theory-based method problem. By using two-point impedance (TpIM) based on graph theory, model for multi-chamber MPPAs are coupled each other two dimensions through perforated side can be developed, onerous task standard equivalent circuit analysis due generation non-planar circuits. The resulting lends itself optimisation thus allows differing geometric parameters tessellated network chambers combined maximise sound absorption particular overall coefficient 0.83 achieved experimentally 660 Hz 2 kHz MC-MPPA only 22 mm thick. addition, when air depth slightly increased 50 mm, greater than 0.82 281 1 range. Experimentally, approximately 340 depth-to-wavelength ratio 20, deeply subwavelength absorber. Results verified theoretically, numerically experimentally.
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ژورنال
عنوان ژورنال: Journal of Sound and Vibration
سال: 2023
ISSN: ['1095-8568', '0022-460X']
DOI: https://doi.org/10.1016/j.jsv.2022.117527