Abstract
When the beamforming algorithm is used to locate the fault of the internal structure, the effective fault acoustic signal will be reflected by the structure shell during its transmission process. This results in the microphone signals being polluted, and then the positioning accuracy being low. In this paper, a phase-shifted beamforming algorithm is proposed to segment the microphone signal, extract the time delay of the reflected noise by using the cross correlation property, and then subtract the reflected noise from the raw data to obtain the microphone signal with weakened reflected signal. The newly generated signals are utilized to calculate the cross-spectral matrix of beamforming, which is then used to locate vibration faults. Simulation results show that the phase-shifted beamforming algorithm can more accurately locate the vibration faults of reflective structures.
Reference16 articles.
1. P. Chiariotti, M. Martarelli, and P. Castellini, “Acoustic beamforming for noise source localization – Reviews, methodology and applications,” Mechanical Systems and Signal Processing, Vol. 120, No. 4, pp. 422–448, Apr. 2019, https://doi.org/10.1016/j.ymssp.2018.09.019
2. G. Huang, J. Benesty, and J. Chen, “Design of robust concentric circular differential microphone arrays,” The Journal of the Acoustical Society of America, Vol. 141, No. 5, pp. 3236–3249, May 2017, https://doi.org/10.1121/1.4983122
3. S. J. Lai and S. M. Li, “Noise source identification of rotating machinery based on near-field acoustic pressure arrays,” Noise and Vibration Control, Vol. 32, No. 3, pp. 122–126, 2016.
4. R. Merino-Martínez, M. Snellen, and D. G. Simons, “Functional beamforming applied to imaging of flyover noise on landing aircraft,” Journal of Aircraft, Vol. 53, No. 6, pp. 1830–1843, Nov. 2016, https://doi.org/10.2514/1.c033691
5. J. Hald, “Cross-spectral matrix diagonal reconstruction,” in Inter-Noise 2016 – 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, pp. 5833–5844, 2016.