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| A Method and Its Application to Determine the Sampling Parameters of Fluctuating Pressure Wind Tunnel Test |
| Received:August 09, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.09.011 |
| KeyWord:fluctuating pressure wind tunnel test sampling frequency sampling time similarity ratio vibration response |
| Author | Institution |
| ZHANG Yujie |
School of Aeronautics, Northwestern Polytechnical University, Xi'an , China;AVIC The First Aircraft Institute, Xi'an , China |
| HUANG Chaoguang |
AVIC The First Aircraft Institute, Xi'an , China |
| SUN Renjun |
School of Aeronautics, Northwestern Polytechnical University, Xi'an , China;AVIC The First Aircraft Institute, Xi'an , China |
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| Abstract: |
| The work aims to deduce the formulae to calculate the sampling frequency by considering the time delay effect in the fluctuating pressure wind tunnel test and the cut-off frequency in the structural vibration response analysis. Based on the statistics theory, the formula used to predict the sampling time under the specific confidence level and accuracy degree was deduced and the requirement of frequency resolution in structural vibration response calculation was taken into account to establish the determination method of sampling time. Based on the input parameters, calculation process and results, the determination process of signal sampling parameters was established. With the fluctuating pressure wind tunnel test of typical aircraft structure as an example, this method was illustrated, and the power spectral density of fluctuating pressure of the prototype structure after similar conversion was analyzed. The results met the requirements of vibration response calculation, which showed that the proposed sampling parameter determination method was feasible and effective. The theoretical basis of this method is clear and it has guiding significance for the design of fluctuating pressure wind tunnel tests. |
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