Noise source identification in transportation systems in Brazil using beamforming technique

2009

Beamforming with acoustic phased arrays has become a popular technique for locating and quantifying noise sources in complex system such as environmental noise, aircraft noise, internal and external automobile noise, beside other applications. The signal processing performs traditional delay‐and‐sum beamforming and accounting for the different propagation paths from the source and to the different microphones. The sources may pass the acoustic camera with high speeds, allowing the beam to focus and follow the bypassing source past the microphone array. The signal processing can zoom into any part of the studied objector of any frequency band. Ultimately, image quality depends on the number of microphones and their configuration. When the microphones cover a big surface, the resolution gets higher; however, the image may contain noise at high frequencies. Reducing microphone distances from the source removes the specks but at the same time worsens the resolution. So the best way to guarantee high‐quality images is to use as many microphones as possible. This paper presents the results of tests with 32‐channel from National Instrument phased array system developed by the UFSC‐Brazil. Measurement results are shown for motorcycle, car motor, and external automobile noise during pass‐by test.

Autores da comunidade :

• 

  J

  José Luís Bento Coelho

  ist11165

  Afiliações e fontes

  IST > CAPS

  Centro de Análise e Processamento de Sinais

• 

  M

  Miguel António Lopes de Matos Neves

  ist13443

  Afiliações e fontes

  IST > DEM

  Departamento de Engenharia Mecânica

  De: orcid

  ID: 11061542

Journal of the Acoustical Society of America (JASA)

2279

2279

126

4

0001-4966

10.1121/1.3249340

mechanical-engineering - Engenharia Mecânica

eng - Inglês