Quantitative analysis of landing gear parametric uncertainty based on polynomial dimensional decomposition method

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (7) : 286-292.

AERONAUTICS AND ASTRONAUTICS

Quantitative analysis of landing gear parametric uncertainty based on polynomial dimensional decomposition method

CUI Panli1,2,3,4, HE Erming*1,2, SONG Dejun5, YANG Zhengquan2,3,4, WANG Binwen2,3,4

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Abstract

Uncertainty widely exists in manufacturing and processing of aircraft landing gear. Here, aiming at solving problem of buffering performance of aircraft landing gear, considering uncertainty of oil hole flow coefficient and gas variability index, firstly, a two-mass nonlinear dynamic equation of landing gear was established, a random surrogate model based on the polynomial dimensional decomposition (PDD) method was constructed, and dynamic analysis was performed. The results were compared with displacement mean and standard deviation obtained with Monte Carlo simulation and deterministic analysis to verify the correctness of PDD method in dealing with the nonlinear problem of landing gear dynamics. Subsequently, PDD method was used to analyze changes in mean, standard deviation and probability characteristics of two masses’ responses when oil hole flow coefficient and gas variability index taking different variation coefficients, and study effects of their uncertainties on solving landing gear buffering performance. It was shown that quantification of uncertain propagation of oil hole flow coefficient and gas variability index performed here can have certain reference significance for reliability design of landing gear buffering performance in future.

Key words

landing gear drop / non-linearity / uncertainty parameter / polynomial dimensional decomposition (PDD) method

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CUI Panli1, 2, 3, 4, HE Erming1, 2, SONG Dejun5, YANG Zhengquan2, 3, 4, WANG Binwen2, 3, 4. Quantitative analysis of landing gear parametric uncertainty based on polynomial dimensional decomposition method[J]. Journal of Vibration and Shock, 2025, 44(7): 286-292

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