Impact of the Soundproofing in the Cavity of the Synthetic Jet Actuator on the Generated Noise

The synthetic jet actuator (SJA) generated high noise which limits the area of its application. In this paper, the five actuators with different types of soundproofing in the cavity were tested and compared to the classic actuator. The resistance and the sound pressure level (SPL) were measured for...

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Bibliographic Details
Published in:Fluids (Basel) 2022-10, Vol.7 (10), p.323
Main Authors: Smyk, Emil, Markowicz, Marek
Format: Article
Language:English
Subjects:
Acoustic insulation
Actuators
Flow control
Investigations
Methods
Mineral wool
multi-orifice synthetic jet
Noise control
noise reduction
Resonant frequencies
Sound pressure
sound pressure level (SPL)
Soundproofing
Synthetic jets
ZNMF
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Summary:The synthetic jet actuator (SJA) generated high noise which limits the area of its application. In this paper, the five actuators with different types of soundproofing in the cavity were tested and compared to the classic actuator. The resistance and the sound pressure level (SPL) were measured for real power P=1, 2, 4 W, and frequency in a range of 20–150 Hz. The resonant frequency of actuators was designed. Only one type of soundproofing had a significant impact on the resonant frequency. The use of soundproofing in the actuator cavity increased or did not affect the generated noise at a frequency below 120 Hz and only the mineral wool significantly decreased the noise at a frequency above 120 Hz– even 7 dBA. The direction for further investigations was set.
ISSN:2311-5521
2311-5521
DOI:10.3390/fluids7100323