Development and Validation of a Masking System for Mitigation of Low-Frequency Audible Noise from Electrical Substations
| Autor: | Mauricio Nogueira Frota, Rogerio Dias Regazzi, Hugo Villela de Miranda, Carlos Roberto Hall Barbosa, Brunno Cunha, João Vitor Souza, Juan José Gómez Acosta, Carlos Augusto Machado Gomes |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Masking (art)
transformer noise Technology soundscape QH301-705.5 Computer science QC1-999 Infrasound Acoustics Low frequency noise masking power substation General Materials Science Biology (General) Instrumentation QD1-999 automotive_engineering Fluid Flow and Transfer Processes Process Chemistry and Technology Physics low-frequency noise General Engineering Engineering (General). Civil engineering (General) Computer Science Applications Chemistry Noise Noise masking Environmental science TA1-2040 Power substation |
| Zdroj: | Applied Sciences, Vol 11, Iss 7771, p 7771 (2021) Applied Sciences Volume 11 Issue 17 |
| Popis: | Low-frequency audible noise generated by the magnetostriction effect inherent to the operation of power transformers has become a major drawback, especially in cases where the electrical substation is located in urban areas subject to strict environmental regulations that imposes sound pressure limits, differing for day and night periods. Such regulations apply a +5 dB penalty if a tonal component of noise is present, which is clearly the case of magnetostriction noise, typically concentrated at twice the industrial frequency (50 Hz or 60 Hz, depending on the country). The strategy used to eliminate the tonal characteristics, therefore contributing to establish compliance with the applicable regulation and to alleviate the discomfort it causes to the human ear, consisted in superimposing to the substation noise a masking sound synthesized from “sounds of nature” with suitable intensities, to flatten the noise spectrum while enhancing the soundscape. The masking system (heavy-duty speakers powered by a microprocessor platform) was validated at an already judicialized urban scenario. Measurement results confirmed that the masking solution was capable of flattening the tonal frequencies, whose beneficial effect yielded the cancellation of the public civil action filed by the neighbors. The proposed solution is ready to be replicated to other scenarios. |
| Databáze: | OpenAIRE |
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