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Effect of central wing on root flight load measurement of certain airfoil
Received date: 2016-01-20
Revised date: 2016-03-29
Online published: 2016-04-21
For flight load measurement using strain gage of certain horizontal stabilizer with central wing, it has been found that right root strain response is large when loading left airfoil in ground calibration test, and vice versa, which could lower flight load measurement accuracy. The mechanism of central wing effects on root flight load measurement was analyzed. Also a method of eliminating opposite load effects on flight load measurement was proposed. Further, the sensitivity of different type load equations to opposite load effects was discussed. Moreover, the corrected load equations were used to measure flight loads. The results show that for above horizontal tail with central wing,the proposed method in this paper could improve root load equation accuracy. The built shear load equation using 2 shear and 1 bending-moment strain bridges is not sensitive to opposite load effects where the measured flight shears through load equations before and after correction have differences under 5.7%, while the built shear load equation using 2 shear and 2 bending-moment strain bridges is sensitive to opposite load effects where the measured flight shear using load equations before and after correction have large differences of 78.6%.
ZHAO Yan , ZHOU Zhanting . Effect of central wing on root flight load measurement of certain airfoil[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(12) : 3713 -3720 . DOI: 10.7527/S1000-6893.2016.0105
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