In preparation for the F-15B airplane (McDonnell Douglas Corporation, St. Louis, Missouri, now The Boeing Company, Chicago, Illinois) Quiet Spike(TradeMark) (Gulfstream Aerospace, Savannah, Georgia) (QS) flight test, baseline F-15B airplane and modified F-15B QS Structural Mode Interaction (SMI) ground tests were performed to compare with military specification requirements for safety-of-flight. Ground-test results were unsatisfactory, so there was some concern about aeroservoelastic (ASE) stability margins in flight. The baseline F-15B airplane was cleared through extensive previous flight-testing and a dedicated ASE flight (testing low dynamic pressure, the worst case). Unfortunately, the modified F-15B-QS configuration had significantly lower margins from both the ground SMI tests, and from an ASE analysis with coupled aerostructural control dynamics, especially with the spike-boom retracted at higher angle of attack (AOA) with less fuel weight. This resulted in an extensive ASE flight clearance based on the SMI and ASE results.
F-15B Quiet Spike(TradeMark) Structural Mode Interaction Ground Test and Aeroservoelastic Flight Test
2007
2 pages
Report
Keine Angabe
Englisch