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Aircraft gust load estimation due to atmospheric turbulence under different flight conditions

Published online by Cambridge University Press:  03 February 2016

E. N. Abdulwahab  and
C. Hongquan
E. N. Abdulwahab
Affiliation:
College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu, China
C. Hongquan
Affiliation:
College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Jiangsu, China
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Abstract

Based on power spectral technique and Lyapunov approach, methodology to determine the vertical gust load on aircraft encountering atmospheric turbulence under different flight conditions is presented in this paper. Modified longitudinal short period aircraft equations of motion to reflect gust inputs are solved. Family of five linear dynamics models of increasing gust excitation complexity are developed to describe the normal load factor throughout an aircraft due to vertical gust. These models (except Model 2) give a rapid estimation of normal load factor in case complete data are not readily available. Numerical model constructed for a Boeing 747 jet transport is solved to illustrate the results. These results show that Model 5 exhibits higher frequency contents when compared with other models under different flight conditions. The normal load factor of aircraft is estimated at different probabilities of not exceeding the corresponding load factor value based on statistical technique. The Models 1, 3, 4 and 5 predict the load factor with maximum 5% error when compared with Model 2 which considered all gust penetration effects. Finally, the results show a good agreement with the published work in load factor determination, at different probabilities of not exceeding this value when encountering a turbulent vertical gust.

Type
Research Article
Information
The Aeronautical Journal , Volume 112 , Issue 1132 , June 2008 , pp. 345 - 352
Copyright
Copyright © Royal Aeronautical Society 2008 

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References

1. Haddadpour, H. and Shams, S., Sharp edge gust effects on aeroelastic behavior of a flexible wing with high aspect ratio, 2005, AIAA 2005-838, 43rd AIAA Aerospace Sciences Meeting and Exhibition, 10-13 January 2005, Reno, Nevada.Google Scholar
2. Etkin, B., Turbulent wind and its effect on flight, J Aircr, 1981, 18, (5), pp 327–345.Google Scholar
3. James, R., Composite method for modeling wind gusts, J Aircr, 1986, 23, (2), pp 131–135.Google Scholar
4. Kim, M.C., Kabe, A.M. and Lee, S.S., Atmospheric flight gust loads analysis, 1999, A99-24645, AIAA Structure, Structure Dynamic, and Materials Conference and Exhibition, 12-15 April 1999, pp 552–562.Google Scholar
5. Buck, K., Bowles, L. and Newman, A., Aircraft acceleration prediction with flight data validation due to atmospheric disturbances, 2005, AIAA 43rd Aerospace Sciences meeting and exhibition, 10-13 January 2005, Reno, Nevada, pp 1–17.Google Scholar
6. Heffley, R.K. and Jewell, W.F., Aircraft handling qualities data, December 1972, NASA Report CR-2144.Google Scholar
7. Nelson, C., Flight Stability and Automatic Control, 1998, McGraw-Hill Co, New York.Google Scholar
8. David, S., Bouge, K., Ehernberger, L. and Baglely, H., Coherent lidar turbulence measurement for gust load alleviation, August 1996, NASA Report TM-104318.Google Scholar
9. Schmidt, V., Introduction to Aircraft Flight Dynamics, 1998, Naval Postgraduate School, AIAA Education Series, Monterey, California.Google Scholar
10. Ogata, K., Modern Control Engineering, Second edition, 1990, Houbolt.Google Scholar