PARAMETER OPTIMIZATION OF HYBRID MICROPERFORATED PANEL (MPP) AS A BROADBAND SOUND ABSORBER
The fundamental characteristic of Micro-perforated panel (MPP) based sound absorbers come with a narrow absorption bandwidth around one up to two octaves, thus limiting their applications in practice. This condition has motivated the use of series and parallel configurations to produce multi-reso...
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| 主要作者: | |
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| 格式: | Theses |
| 語言: | Indonesia |
| 在線閱讀: | https://digilib.itb.ac.id/gdl/view/61751 |
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| 機構: | Institut Teknologi Bandung |
| 語言: | Indonesia |
| 總結: | The fundamental characteristic of Micro-perforated panel (MPP) based sound
absorbers come with a narrow absorption bandwidth around one up to two octaves,
thus limiting their applications in practice. This condition has motivated the use of
series and parallel configurations to produce multi-resonance to obtain a wider
overall absorption frequency range. Considering merit of each configuration, a
hybrid MPP as combination of series and parallel in the MPP system was proposed
to have a more rational thickness while wider absorption bandwidth can be
preserved. However, the configuration and structure of the hybrid MPP are more
complicated that arise a challenge to find the design parameters for the best
absorption performance. In this study, an optimization technique formulation was
developed by considering a minimum absorption of 0.8 with an absorption range
of more than 3 octaves (> 2000 Hz).
Three heuristic optimization methods widely applied in absorber systems, namely
Genetic Algorithm (GA), Simulated Annealing (SA), and Cuckoo Search Algorithm
(CSA) are considered. The result shows that the parameters obtained by the CSA
lead to the highest average absorption coefficient of ???????? which is about 0.95 (>0.80)
and the absorption range ?????????,???????? reaches more than 3000 Hz and ?????????,???????? increases
by 22.7% from the initial parameter. Extending the optimization frequency range
is useful to increase ?????????,???????? by 10-13% with an average ???????? of 0.95. Meanwhile, the
use of cost function with RMSE approach can widen the absorption range of ?????????,????????
by 12.7% with an average ????????of 0.84. Moreover, reducing the panel thickness
parameter value range can increase ?????????,???????? by 4.0% with an average ????????of 0.86 and
the absorption range of ?????????,???????? increases by 15.0%, with an average ???????? of 0.95 from
the initial parameter. Considering the results, the optimization techniques used in
this study are able to produce better parameters for targeted absorption
characteristics.
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