A MODIFIEDH2FEEDFORWARD ACTIVE CONTROL SYSTEM FOR SUPPRESSING BROADBAND RANDOM AND TRANSIENT NOISES
✍ Scribed by M. Bai; H. Chen
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 301 KB
- Volume
- 198
- Category
- Article
- ISSN
- 0022-460X
No coin nor oath required. For personal study only.
✦ Synopsis
Three feedforward active noise control algorithms based on H2, Ha, and modified H2 optimal model matching principles are investigated in this study. The first two methods provide significant attenuation for broadband random noises. However, the H2 and Ha methods generally result in high-gain controllers at high frequencies, which calls for some truncation measures in the frequency domain. The third method effectively eliminates the high-gain problem of the ordinary H2 and Ha algorithms. In addition, this method is guaranteed to result in a causal and stable controller which is crucial in practical implementation. The algorithms are coded into controllers by using a floating-point digital signal processor. The experimental results show significant attenuation for stationary broadband random noises as well as transient impact noises in a duct.