ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Influence of a 3/4 open jet floor on far field noise measurements in aeroacoustic wind tunnel
Received date: 2016-01-22
Revised date: 2016-06-01
Online published: 2016-06-12
Supported by
National Natural Science Foundation of China (11504417)
Based on the Kirchhoff-Helmholtz diffraction theory, a transient theoretical model for the reflection of spherical sound wave from a 3/4 open jet floor is built, and the amplitude shading and time delay function for the reflection sound pressure on the floor is derived. A numerical method is introduced to solve the reflection sound field. The correctness of the presented method is verified by an experiment. In this study, sin-burst pulse and continuous sinusoidal wave are used to study the propagation of the sound wave and the influence of the 3/4 open jet floor on the far field noise measurements, respectively, and the following results are obtained:the received sound signal contains the directed wave and reflection wave, and the reflection wave is further divided into the center wave and edge wave. In the low frequency range, when the floor width increases, the far field sound pressure level increases accordingly, while in the high frequency range, increasing the floor width has non-obvious effect on the far field noise level. For a high speed train (HST) model, the bogie noise source is easier to be influenced by the floor than the pantograph noise source.
ZHANG Jun , CHEN Peng , LEI Hongsheng , ZHANG Junlong , LI Zhengchu . Influence of a 3/4 open jet floor on far field noise measurements in aeroacoustic wind tunnel[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(8) : 2574 -2582 . DOI: 10.7527/S1000-6893.2016.0184
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