Acoustical performance of Helmholtz resonators used as vehicular silencers
| Autor: | Lucas Martins Rodrigues, Cristiano Fragassa, Gustavo Guimarães Paulinelli |
|---|---|
| Přispěvatelé: | Martins, Lucas Rodrigues, Guimarães, Gustavo Paulinelli, Fragassa, Cristiano |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Acoustics
muffler 02 engineering and technology 01 natural sciences law.invention Noise attenu- ation symbols.namesake Resonator 0203 mechanical engineering law helmholtz resonator reactive silencer 0103 physical sciences Mechanics of Material 010301 acoustics Helmholtz resonator Physics Muffler noise attenuation Mechanical Engineering vehicular exhaust system 020303 mechanical engineering & transports Mechanics of Materials lcsh:TA1-2040 Helmholtz free energy symbols lcsh:Engineering (General). Civil engineering (General) lcsh:Mechanics of engineering. Applied mechanics lcsh:TA349-359 |
| Zdroj: | FME Transactions, Vol 46, Iss 4, Pp 497-502 (2018) |
| ISSN: | 1451-2092 |
| Popis: | This study proposes to evaluate the acoustical performance of a reactive vehicular silencer made entirely of Helmholtz resonator. Four or seven resonators are idealized to be in a series configuration, all the dimensions except cavity length and resonators are fixed. An algorithm processes inputted characteristic engine noise signal obtained from literature, identify peaks, and calculates ideal cavity length for attenuation. The transmission loss of the system is analytically calculated. Attenuation levels obtained are satisfactory. The required volume of the resonator to achieve the same resonance frequency as low frequency noise peak demands impractical cavity length, proving it to be flawed. It is suggested to use resonators of two or three different diameter for different frequency range in order to overcome this problem. |
| Databáze: | OpenAIRE |
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