Simulation research on narrow-band active noise reduction of wind driven sprayer based on NLMS algorithm

SUN Daozong; ZHAN Xurui; LIU Sijing; XUE Xiuyun; XIE Jiaxing; LI Zhen; SONG Shuran

doi:10.7671/j.issn.1001-411X.202104038

Journal of South China Agricultural University > 2021 > 42(6): 71-78. > DOI: 10.7671/j.issn.1001-411X.202104038

SUN Daozong, ZHAN Xurui, LIU Sijing, et al. Simulation research on narrow-band active noise reduction of wind driven sprayer based on NLMS algorithm[J]. Journal of South China Agricultural University, 2021, 42(6): 71-78. DOI: 10.7671/j.issn.1001-411X.202104038

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Simulation research on narrow-band active noise reduction of wind driven sprayer based on NLMS algorithm

SUN Daozong^{1, 2,},
ZHAN Xurui¹,
LIU Sijing¹,
XUE Xiuyun^{1, 2, 3},
XIE Jiaxing^{1, 2},
LI Zhen^{1, 2, 3},
SONG Shuran^{1, 2, 3, ,}

1.
College of Electronic Engineering/College of Artificial Intelligence, South China Agricultural University, Guangzhou 510642, China
2.
Guangdong Engineering Research Center for Monitoring Agricultural Information, Guangzhou 510642, China
3.
Division of Citrus Machinery, China Agriculture Research System/Guangdong Engineering Technology Research Center for Mountainous Orchard Machinery, Guangzhou 510642, China

More Information

Received Date: April 29, 2021
Available Online: May 17, 2023

Graphical Abstract

Abstract

Abstract

Objective
To analyze the noise in the air outlet of wind driven sprayer, explore the appropriate noise reduction methods and improve the noise reduction effect.

Method
This paper analyzed the noise frequency spectrum in the air outlet of the wind driven sprayer, adopted the narrow-band active noise reduction method to reduce the noise of fan outlet, analyzed three common noise reduction algorithms, comparatively considered the convergence speed and noise reduction performance of three algorithms, and selected the NLMS algorithm as the core algorithm. In order to improve the frequency disturbance caused by non acoustic sensors in the narrow-band active noise reduction system, genetic algorithm was introduced to optimize the initial frequency calculated by the acquisition parameters of the rotator. The fan noise was taken as the input signal, and five frequency channels (197, 394, 591, 788 and 985 Hz) were used for narrow-band active noise reduction simulation.

Result
The noise of the wind driven sprayer was mainly rotating noise caused by fan blade rotation. The simulation results showed that the system performance was improved after 33 iterations of the genetic algorithm. When the NLMS algorithm was iterated 10 000 times, the system converged, and the amplitudes of the five frequency channels were reduced by 0.192, 0.041, 0.024, 0.018 and 0.210 mm respectively, and the overall noise reduction effect was about 14 dB.

Conclusion
The NLMS algorithm has better reduction effect on the noise of wind driven sprayer. Genetic algorithm can effectively improve the frequency disturbance caused by non acoustic sensors. This study provides a reference for active noise reduction methods of wind driven sprayers.
- NLMS algorithm,
- active noise reduction,
- wind driven sprayer,
- genetic algorithm,
- narrowband noise,
- frequency modulation

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References (37)

References

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