Investigation of the Sonic Fatigue Characteristics of Randomly Excited Aluminum Viscoelastic Panels at Ambient Temperatures
NORTH AMERICAN AVIATION INC COLUMBUS OH
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An experimental sonic fatigue program was conducted on aluminum viscoelastic and aluminum control panels. The panels were tested at 154 db, 157 db, and 160 db using a Broad-Band Siren as the noise source. Previously, these structures were evaluated under discrete frequency excitation. The primary purpose of this effort was to continue to investigate the usefulness of viscoelastic structures under high acoustic random loads. Tests substantiate that the viscoelastic panel has slightly better sonic fatigue properties than an equivalent-by-weight aluminum panel.