Beamforming for quality control in industrial environment
This work presents the application of beamforming for the quality control of washing machine in industrial application. The objective is to substitute sensors like accelerometers or Laser Doppler Vibrometers in order to acquire vibration emission of a machine and use that information for the diagnosis of the quality status. The main problem is related to the industrial environment in which the noise level, due to production process or the test of other machine, reduce the Signal-to-Noise of acoustic based techniques. In this paper a small microphone array is used to acquire acoustic emission of the machine. Beamforming algorithm is used to focus the microphone sensitivity and to avoid disturbance of surrounding environment and other machines. The performance of the proposed technique is also evaluated by comparison with LDV measurement in controlled conditions in an anechoic chamber and in a reverberant environment, with different level and kind of disturbing noise in order to qualify the proposed technique.
KeywordsAcoustic Emission Industrial Environment Anechoic Chamber Laser Doppler Vibrometer Beamforming Algorithm
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- 1.1 S. Oerlermans, B. Mendez Lopez; Acoustic Array Measurements on a Full Scale Wind Turbine; NLR-TP- 2005–336.Google Scholar
- 2.2 R.P. Dougherty, Beamforming in Acoustic Testing in Aeroacoustic Measurement, SpringerGoogle Scholar
- 3.3 P.Castellini, M.Martarelli, Acoustic beamforming: analysis of uncertainty and metrological performances, Mechanical Systems and Signal Processing, 22, pp.672–692, 2008, ISSN 0888–3270Google Scholar
- 4.4 S. Oerlemans, P. Sijtsma; Determination of absolute levels from phased array measurements using spatial source coherence; Proceedings of the 8th AIAA/CEAS Aeroacoustics Conference & Exhibit, 17–19 June 2002, Breckenridge, Colorado AIAA 2002–2464.Google Scholar