04.2 - Structural Analysis and Design, Structural Dynamics, Aeroelasticity
APPLICATION RESEARCH OF ZIMMERMAN-WEISSENBURGER-YANG METHOD FOR PREDICTING FLUTTER BOUNDARY
Y. FEI, Shang Hai Aircraft Design and Research Institute of COMAC, China
Demonstration of compliance which aeroelastic stability certification test program for an airplane flutter characteristic may be shown by flutter model tests and flight flutter tests. Flutter model testing may be used to establish flutter trends and validate aeroelastic stability boundaries. Flight flutter testing provides final verification of aeroelastic stability. The sub-critical flutter prediction is used in flutter model test and flight flutter test. The commonly employed damping versus velocity method and Zimmerman-Weissenburger?Z-W?method is presented in paper. The damping measurements in themselves give little useful information beyond whether or not flutter was encountered at the test speeds flown. In sub-critical flutter point boundary, the damping is non distinctness change trends results in the flutter boundary can't be predicted, but the Z-W method could predict flutter boundary. According to an airplane T-tai flutter model high speed wind tunnel test and flight flutter test data, the flutter boundary is predicted by damping versus velocity method and Z-W method. An improved Zimmerman-Weissenburger method is bring forward in paper to predict multiple mode couple flutter. The improved Zimmerman-Weissenburger method is named Zimmerman-Weissenburger-Yang method, which can more accurately predicting the flutter boundary than Z-W method. The flight flutter test data is used to predict flutter with Zimmerman-Weissenburger-Yang method. The result demonstrate that the Zimmerman-Weissenburger-Yang method is more nicety in flutter boundary predict?Fig1 and Fig2?