An Efficient Method of Computing Maneuvering Aircraft Surface Loads Using CFD, Proper Orthogonal Decomposition, and System Identification

摘要

A method is described to decompose spatial-temporal surface data from a maneuvering aircraft into a set of orthonormal modes in the spatial coordinate, and a set of time series of coefficients for those modes. The coefficient time histories can be modeled by the active flight parameters using system identification. Using the orthonormal modes and an estimated set of coefficients new surface pressure profiles can be generated. We build on previous work done using this procedure to investigate improvements to the system identification and spatial decomposition methods. We then demonstrate how this procedure is used in a typical aircraft loads analysis. This procedure will reduce the computational time required to generate flow data for a loads analysis.