Low frequency sound absorption performance of large sized active micro-perforated panel absorber in free field
نویسندگان
چکیده
The active micro-perforated panel absorber has excellent low frequency sound absorption performance, which is expected to realize low-frequency noise reduction in large space of the cabin. Since its performance depends on incident field environment, basis existing research conclusions duct, large-sized under excitation a normal plane wave typical free environment depth investigated. First, theoretical model established by using modal analysis approach, reflection coefficient varying with position introduced represent reflected surface field. Then, physical mechanism control thoroughly analyzed and error sensing strategy established. Finally, an experiment carried out validate findings. Results obtained demonstrate that greater amplitude (0, 0, 0) cavity mode excited wave, stronger effect is, vice versa. source suppresses so this will not reflect absorb substantially when reduced optimal value. This main improvement range. However, high order modes (except for mode) greatly energy exert negative improvement. Thus, weakens comparison duct. pressure-release impedance-matching strategies are still applicable as long such situation holds, i.e. can be suppressed at same time cannot highly excited.
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ژورنال
عنوان ژورنال: Chinese Physics
سال: 2023
ISSN: ['1000-3290']
DOI: https://doi.org/10.7498/aps.72.20222151