Application of PCE Method in Parafoil-flight Uncertainty Analysis

doi:10.3969/j.issn.1000-1093.2021.07.006

Abstract

Abstract: A parameter uncertainty analysis method is proposed based on polynomial chaos expansions (PCE) method for the uncertainty quantification problem of parafoil flight performance. A nine-degrees-of-freedom multibody dynamics model of parafoil system with random parameters is established, and a proxy model is established to approximate the nonlinear dynamics model of parafoil system by using the PCE method. The influences of different PCE orders and sample sizes on the calculation results are analyzed. Considering the calculation accuracy and efficiency, a PCE model suitable for parafoil-flight uncertainty analysis is proposed. The simulated results show that the PCE method can achieve the same calculation accuracy and has higher efficiency compared with the Monte Carlo method, which verifies the effectiveness of the PCE method for the flight uncertainty analysis of parafoil system. For a small parafoil system, the PCE method is used to study the influence of aerodynamic parameters uncertainty on the distribution and deviation of landing points.

Key words: parafoilprecisionairdropsystem, polynomialchaosexpansion, multi-bodysystemdynamics, uncertaintyanalysis

CLC Number:

V211.59

LIU Anmin, GAO Feng , ZHANG Qingbin, YUAN Tianbao, ZHANG Guobin. Application of PCE Method in Parafoil-flight Uncertainty Analysis[J]. Acta Armamentarii, 2021, 42(7): 1392-1399.

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