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| Time Domain Equivalence Simulation Method in Continuous Gust Frequency Response Process |
| Received:June 30, 2020 Revised:July 08, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.09.004 |
| KeyWord:continuous gust powerspectral density time domain simulation |
| Author | Institution |
| LIU Ying-ying |
Load Department of Shanghai Aircraft Design and Research Institute, Commercial Aircraft Corporation of China Ltd, Shanghai , China |
| LIU Jing-guang |
Load Department of Shanghai Aircraft Design and Research Institute, Commercial Aircraft Corporation of China Ltd, Shanghai , China |
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| Abstract: |
| The work aims to construct the calculation model of gust response of single wing with high aspect ratio of civil aircraft, and calculate the random load of continuous gust according to the power spectral density function of atmospheric turbulence specified by CCAR25, so as to simulate the continuous gust response in time domain. The common time domain numerical simulation methods of power spectral density function were compared and random phase was directly assigned to spectrum. The gust time domain excitation equivalent to the power spectral density function used in the random calculation of continuous gust was obtained by inverse fourier transform to carry out discrete gust load analysis and compare the continuous gust response calculation results. The results indicated that based on the equivalence of power spectral density function, the method of constructing time domain gust excitation by random phase was fast and effective, which could visually display the time domain of load response under random gust excitation and facilitate nonlinear analysis in time domain. Comparing the bending moment, shear force and torque of the wing, the deviation between the bending, shearing and torsional loads obtained by discrete gust load analysis and those obtained by continuous gust load analysis was less than 3%. |
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