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The Research of Noise Source Identification Method Based on Sound Array and Acoustic Holography Harmonic

Author: DuLiang
Tutor: HuangJing
School: Zhejiang University of Technology
Course: Signal and Information Processing
Keywords: Noise source identification Array signal processing Acoustic holography Sound arrays Beam - forming
CLC: TB535
Type: Master's thesis
Year: 2011
Downloads: 180
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Abstract


With the development of China’s social and economic, noise pollution has caused more and more serious influence on people’s study, work, life and health. People become increasingly focus on noise control. High efficiency noise source identification technology has become more and more researchers’objectives of study. Acoustic holography harmonic and array noise source identification method are two common noise source identification technology, in recent years they have achieved rapid development, but the two methods have its own limitations in noise source identification. This paper studies the respective advantages and disadvantage of the two methods in noise source identification, makes improvement and corrections for them respectively, puts forward a noise source identification technology based on sound array method combination with Acoustic holography. The combination method using Acoustic holography method in low frequency domain for sound-field reconstruction, using sound array method in the high frequency domain for noise recognition, and obtain sound-field information of the whole frequency domain by combining the two methods of analysis results.This paper’s study work includes the following aspects:(1) For noise source identification method based on sound array, beam-forming method is mainly studied, this paper adopts array direction matrix to correct the traditional beam-forming method and improves the noise source identification effect greatly.(2) For Acoustic holography method’s research, this paper analyzes the experience formula used to select the globe wave number of filtering window function. The experience formula did not consider SNR, measuring distance and f the sound source frequency, so this paper takes them into consideration and obtain a new globe wave number selection formula to optimize filtering window function, reduced the reconstruction error effectively.(3) For the advantages and disadvantages of beam-forming method and Acoustic holography method noise source identification, a combination of noise source identification method was proposed. This paper deduces the reasonable classification principles of frequency domain, assigned suitable frequency domain for beam-forming method and Acoustic holography method. For the design of measuring array, in order to reduce system cost, this paper makes sound arrays with a small amount of microphones, use holographic HRTFS outside push technology based on the belt limit signal recovery algorithm to increase holographic aperture in algorithm, and achieved the purpose of improving the curve-fitting accuracy. After a great deal of numerical simulation and experiment, the effectiveness of this combination method and its superiority to Acoustic holography and beam-forming method were verified.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use
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