论文信息 - A directional microphone array for acoustic studies of wind tunnel models

A directional microphone array for acoustic studies of wind tunnel models

An end-fire microphone array that utilizes a digital time delay system has been designed and evaluated for measuring noise in wind tunnels. The directional response of both a four- and eight-element linear array of microphones has enabled substantial rejection of background noise and reverberations in the NASA Ames 40- by 80-foot wind tunnel. In addition, it is estimated that four- and eight-element arrays reject 6 and 9 dB, respectively, of microphone wind noise, as compared with a conventional omnidirectional microphone with nose cone. Array response to two types of jet engine models in the wind tunnel is presented. Comparisons of array response to loudspeakers in the wind tunnel and in free field are made.

Paul T. Soderman | Stephen C. Noble

[1] F. A. Wilcox,et al. Comparison of ground and flight test results using a modified F106B aircraft , 1973 .

[2] R. E. A. Arndt,et al. Aeroacoustic research in wind tunnels: A status report , 1973 .

[3] D. G. Koenig,et al. Aspects of investigating STOL noise using large scale wind tunnel models , 1972 .

[4] P. T. Soderman,et al. Comparison of aircraft noise measured in flight test and in the NASA Ames 40- by 80-foot wind tunnel. , 1973 .

[5] R. J. Moffett. Comparison of Aircraft , 1934 .

[6] P. T. Soderman,et al. A four-element end-fire microphone array for acoustic measurements in wind tunnels , 1974 .