Acoustic duct liner optimization using finite elements

Determination of a mathematical model which ma) Startbe used far obtaining optimum acoustic liners in aeroengine ducts was the goal of this study. ing with a baseline finite element model’which consumed too much computer time to permit optimum liner evaluation for realistic ducts and source frequencies, a survey was conducted of candidate methods for reducing computational effort . A highly effective boundary exclusive decomposition method was developed which enables L-U decomposition of a major partition of the global matrix to be performed once only. the technique in duct liner optimization show a reduction of between one and two orders of magnitude in the central processor unit (CPU) time of the baseline model. Timing experiments using