科研之友
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摘要
A recursive von Karman turbulence model is developed and integrated into the current distributed turbulence model for helicopter flight simulation and handling quality analysis in atmospheric turbulence. First, high-order filters are developed with rational expressions to approximate the von Karman spectra. Recursive algorithms for modeling the von Karman turbulence are derived by discretizing the filters with the Tustin transform. Then, the recursive von Karman turbulence model is used to replace the Dryden model in the current distributed turbulence model for helicopter flight simulation in atmospheric turbulence. The results show that the spectra of the recursive von Karman turbulence have an excellent agreement with the theoretical von Karman spectra, and they are valid over a normalized frequency range up to 400 rad, which is suitable for helicopter handling quality analysis in atmospheric turbulence with low flight speed and large turbulence scale lengths. The present turbulence model significantly extends the capability of helicopter handling quality analysis to the higher-altitude and lower-velocity flight conditions compared with the current distributed turbulence model.
- 出版日期2017-9
- 单位南京航空航天大学
