DEVELOPMENT OF ANECHOIC TERMINATION BASED ON METASURFACE
Anechoic termination is an acoustic component that has been widely used at the end of a duct or pipe as a boundary that has the ability to absorb incoming waves perfectly so that the pipe can behave like a pipe with infinite length. Anechoic termination is generally made of porous material with a mi...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/70351 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Anechoic termination is an acoustic component that has been widely used at the end of a duct or pipe as a boundary that has the ability to absorb incoming waves perfectly so that the pipe can behave like a pipe with infinite length. Anechoic termination is generally made of porous material with a minimum thickness equivalent to ?/4 in order to have an effective performance that become cut-off for lower frequency range.,. Furthermore, the use of other acoustic material systems such as micro perforated panels (MPP) has contributed significantly to the improvement of the thickness problem. However, the acoustic performance of the material system is effective in a relatively narrowband frequency with rear air cavity of MPP still conform to the rule of ?/4. This study aims to develop an anechoic termination based on resonator system that can provide nearly perfect sound absorption performance over a wide working frequency range (broadband frequency) with a thinner thickness that meets the criteria of a subwavelength structure with a thickness less than ?/4. In this study, a labyrinth type resonator adopted which is modeled using the Coupled Mode Theory (CMT) to obtain the absorption coefficient as an alternative of Stinson model for the same case. To study the behavior of the resonator system, a parametric studies and development of resonator structure in paralel configuration and were carried out. Eventually, this configuration to form a metasurface layer to achieve a broadband acoustic performance with perfect absorption or quasi perfect absorption. The results of this study indicate that there is a concordance between the simulation results and experimental results, where the validation results obtained can be used as a reference for the design and fabrication of resonator-based anechoic termination.
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