An investigation into wind generated aero-acoustic tones

Authors

  • Peter Alexander Ibbotson Marshall Day Acoustics, Christchurch, New Zealand
  • Jason Cambridge School of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand
  • John Pearse School of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand

Keywords:

Acoustics, Fast Fourier transforms, Fourier transforms, Hospitals, Natural frequencies, Parking, Subsonic flow, Acoustic tones, Bending, External-, Forced vibration responses, Fundamental modes, Measuring, Narrow bands, New zealand, Parking buildings, Private hospitals, Tonal noises

Abstract

A study was conducted to investigate wind generated aero-acoustic tones in a private hospital in Christchurch, New Zealand. The investigation was conducted at a newly constructed six level car parking building at the hospital, due to a complaint regarding tonal noise audible during windy conditions. Researchers performed tests during windy conditions, using fast Fourier Transform (FFT) analysis, to allow a narrow band assessment of the tone to be performed. A forced vibration response of the balusters was measured by exciting the fundamental mode natural frequency with a hammer and measuring the response with an accelerometer. The results show that the external balusters have a natural frequency response at 1550 and 2753Hz in bending.

Published

2008-09-01

How to Cite

1.
Ibbotson PA, Cambridge J, Pearse J. An investigation into wind generated aero-acoustic tones. Canadian Acoustics [Internet]. 2008Sep.1 [cited 2021May9];36(3):52-3. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2033

Issue

Vol. 36 No. 3 (2008)

Section

Proceedings of the Acoustics Week in Canada

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