The Study of Adaptively Active Vibration Control on Acoustic Radiation from Plates of Various Areas in Window
Date Issued
2011
Date
2011
Author(s)
Yeh, Tung-Chiang
Abstract
Noise control methods mainly have two techniques, which are passive and active noise controls. Traditionally we use passive damping techniques or redesign system to eliminate the medium and high frequency range of noise. This study use the characteristics of different size area to execute active noise control for both low and high frequency,and then compare the results.
This study uses FIR digital filter and LMS algorithm as the main structure of the control system, and there are two frameworks for the experiment in this study. The first one involved for single-frequency noise use ceramic PZT to execute active control on area of different size plate respectively. The second part involved for dual-frequency noise change the hardware section to two filters to filter out the error input noise and excite two PZT at the same time.
The result shows that for single or dual-frequency noise, it can attenuate almost more than 10dB at the resonant frequency. In addition, it can also achieve more than 4dB sound pressure attenuation at non-resonant frequency.
Subjects
active noise control
digital filter
adaptive least mean square method
Type
thesis
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