For conventional micro-perforated panel sound absorption structures, achieving satisfactory broadband sound absorption performance usually requires multiple sound absorption units to be connected in series. However, such configurations struggle to provide effective broadband sound absorption under space-constrained conditions. To address this issue, this study takes a stepped multi-cavity micro-perforated panel structure as the basis and further improves the performance of the sound absorption structure by fully utilizing the redundant space within the stepped cavities. An improved structure connecting the long cavity and the redundant space is proposed. The effectiveness and reliability of the proposed structure have been preliminarily validated through theoretical calculations and simulation analyses. The results show that the structure achieves effective sound absorption in the frequency range of 700 Hz to 3250 Hz with a sound absorption coefficient above 0.8 at a total thickness of only 50 mm. While maintaining excellent broadband performance, it also exhibits certain low-frequency sound absorption capabilities.
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