Journals
  Publication Years
  Keywords
Search within results Open Search
Please wait a minute...
For Selected: Toggle Thumbnails
Application of Partial Coherence for Noise Source Identification in Aeroacoustic Wind Tunnel
GU Guang-wu;ZHU Bo
   2011, 31 (4): 142-144.   DOI: 10.3969/j.issn.1006-1355-2011.04.033
Abstract （1935）            Save
Identification of noise source is of important significance for noise control. In this paper, a multiple input/single output model for system noise identification is established. The technique of measurement of noise source contribution and partial coherence analysis are introduced and discussed. The formula of partial coherence function is given by “residual spectrum”. Aiming at 0.55m×0.4m aeroacoustic wind tunnel, the measurement scheme is presented. According to the noise measurement data, the main noise source in aeroacoustic wind tunnel is identified.
Related Articles | Metrics
Measurement and Spectrum Analysis of Background Noise of Aeroacoustic Wind Tunnel
GU Guang-Wu;ZHU Bo
   2011, 31 (2): 156-158.   DOI: 10.3969/j.issn.1006-1355-2011.02.037
Abstract （2494）            Save
It is necessary to measure and analyze the background noise of aero-acoustic wind tunnel in order to reduce its sound pressure level (SPL). In this paper, the measurement scheme and frequency spectrum analysis of a 0.55m×0.4m aero-acoustic wind tunnel are introduced. According to the acquired data, the power spectrum density is obtained by means of the average periodic diagrams, and the result is comprehensively analyzed. The result of measurement shows that the SPL of the background noise is 78.15dB when the wind speed in the open-jet test sections is 80m/s.
Related Articles | Metrics