Mode identification and data synthesis of HART II blade deflection data

Kurzfassung

HART II blade deflection data are available at discrete radial and azimuthal positions. They contain measurement errors and data gaps. Using least error squares method, predefined mode shapes (depending on the radial coordinate only) each one having a Fourier series as a generalized time dependence are fitted to the data field. After identification of the Fourier series coefficients the quality of the reconstruction is found to be within the measurement error bounds. Using the mode shapes and their Fourier series a reconstruction of the blade motion is possible at any radial position from the blade hinge and at any azimuthal position, which is necessary for code validation or computational fluid dynamics applications.