Accession Number : ADB002840


Title :   Development of Active Flutter Suppression Wind Tunnel Testing Technology


Descriptive Note : Final rept. Jun 1972-Sep 1974


Corporate Author : BOEING WICHITA CO KS


Personal Author(s) : Sevart, Francis D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/b002840.pdf


Report Date : Jan 1975


Pagination or Media Count : 148


Abstract : A research study was conducted to develop active flutter suppression wind tunnel testing technology. A one-thirtieth scale B-52 aeroelastic model was modified to represent the Control Configured Vehicles (CCV) B-52 flight test airplane with an active flutter mode control system (FMCS). The system was mechanized on the model using electromechanical actuation systems for the scaled CCV airplane outboard aileron and flaperon outboard segment control surfaces. The model was tested in the NASA-Langley Transonic Dynamics Tunnel to evaluate the unaugmented model flutter characteristics and performance of the flutter mode control system. Test results were compared with model analytical results and CCV program flight test results for equivalent weight and altitude conditions. The model flutter speed, in airplane scale, is 8.1 percent higher than the airplane flutter speed, less than 1.0 percent higher than the predicted difference. Flutter mode damping with the FMCS engaged is higher on the model than on the airplane, but the damping trends with increasing airspeed are similar. The good agreement attained between model and airplane test results demonstrates that dynamically scaled models can be used to verify analytical methods used to design active flutter mode control systems.


Descriptors :   *AIRCRAFT MODELS , *FLUTTER , AILERONS , AIRSPEED , CAPTIVE TESTS , DAMPING , EQUATIONS OF MOTION , FLAPS(CONTROL SURFACES) , FLIGHT TESTING , FREQUENCY , GUST LOADS , HIGH ALTITUDE , SIMULATION , STABILITY , SUPPRESSION , TURBULENCE , WIND TUNNEL TESTS


Subject Categories : Aerodynamics
      Bombers


Distribution Statement : APPROVED FOR PUBLIC RELEASE