民机全机疲劳试验综合加速技术研究与验证

doi:10.7527/S1000-6893.2020.24919

Abstract

Abstract: The full-scale fatigue test of civil aircraft is related to airworthiness certification and service use. In order to shorten the fatigue test time, the comprehensive acceleration technology is studied from two aspects of load spectrum simplification and test process acceleration. The DFR method is improved to fit the whole life interval. The equivalent damage conversion method taking the damage ratio as the judgment basis is proposed based on improved DFR, and it's correctness is verified by a small test piece, and then it is applied to the full-scale fatigue test. The total number of cycles in each task segment is greatly reduced after the load spectrum simplification. The damage results of the rear fuselage test applied original load spectrum are basically the same as those of the full-scale aircraft test applied simplified load spectrum. It can be seen that the method is suitable for the full-scale fatigue test. For different stages of test implementation, the overall load balance optimization is proposed to quickly complete the load handing, and the subsection constant rate loading optimization is proposed to reasonably shorten loading time of each cycle. The error of load handling results meet the design requirements. The average number of daily landings increases from 48 to 90.

Key words: full scale fatigue test acceleration of civil aircraft, improved DFR, equivalent damage conversion, overall load balance optimization, subsection constant rate loading

CLC Number:

V216.3

WANG Yupeng, TIAN Wenpeng, SONG Pengfei, XIA Feng, FENG Jianmin. Research and verification of comprehensive acceleration technology for civil aircraft full-scale fatigue test[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(5): 224919-224919.

References

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Research and verification of comprehensive acceleration technology for civil aircraft full-scale fatigue test

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