Effect of structural parameters on mode localization of high horizontal tail of airplane

For mistimed high horizontal tail (HHT), mode localization can significantly change its natural vibration characteristics and then influence its flutter performance. Considering that mistuning in structure is unpredictable, four possible mistuned HHT models are designed, which include increasing mass mistuning(IMM), decreasing mass mistuning(DMM), increasing stiffness mistuning(ISM) and decreasing stiffness mistuning(DSM), respectively. With the mistuning value of ±0.5, the degree of mode localization under different parameters of wing beams and ribs is calculated through modal analysis, and then the effect of structural parameters on mode localization from different reasons are discussed. Numerical results indicate that the degree of mode localization increases with the increase of thicknesses of fin beams and decreases with the increase of thicknesses of horizontal tail beams, while it remains almost the same when changing the parameters of ribs. The effect of parameters of rear beams on mode localization is more significant than that of parameters of front beams. When the thickness of fin rear spar reaches 2.0mm, the degree of mode localization change from 0.342 to 0.971, which is so significant that needs to be concerned. Besides, mode localization resulted from IMM and DSM is more sensitive to the variation of structural parameters than that resulted from DMM and ISM.