Back to Search
Start Over
Design of Tunable Acoustic Liner and Adaptive Control System
- Source :
- Acoustics Australia. 49:83-91
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Traditional acoustic liners used in nacelles and fan ducts include a perforated face sheet bonded to a honeycomb core. A tunable acoustic liner with a piezoelectric substrate is developed to overcome the shortages of current liner such as unchangeable structure and uncontrollable bandwidth. After the piezoelectric panel deformed under the driving voltage, the resonant chamber changed, and the resonant frequency shifts. The finite element method is used to calculate the acoustic system’s resonant frequency and sound pressure distribution. The transmission loss measurement was carried out in an impedance tube to demonstrate the broadband noise control effect of the liner. The experiment result indicates that the TL peak frequency keeps linear with the driving voltage, and the sensitivity is measured to be 0.1 Hz/V. A DC amplified circuit using photo resistor is designed based on constructing the function of driving voltage and noise frequency. Benefit from the adaptive algorithm, when the noise frequency offsets from 756 to 788 Hz, the driving voltage can be automatically regulated from 110 to 420 V, and the liner always keeps resonating. Meanwhile, the sound level was reduced. The adaptive noise control is realized for broadband noise reduction.
- Subjects :
- Adaptive control
Materials science
Acoustics and Ultrasonics
Adaptive algorithm
Acoustics
Transmission loss
01 natural sciences
law.invention
03 medical and health sciences
Noise
0302 clinical medicine
law
0103 physical sciences
Noise control
Resistor
030223 otorhinolaryngology
Sound pressure
010301 acoustics
Voltage
Subjects
Details
- ISSN :
- 18392571 and 08146039
- Volume :
- 49
- Database :
- OpenAIRE
- Journal :
- Acoustics Australia
- Accession number :
- edsair.doi...........ca8d6c7842dc75568c46f3544f435767