Reconstruction of turbine blade forces from response data

A procedure for estimation of the forcing functions on a turbine blade from response data is described. Solution of the inverse problem requires knowl edge of the eigenproperties of the blade. The measured bending and torsiona l deflection data are transformed into modal responses. The modal responses are treated to be results of modal forces, which can be discretised in the time domain. A deconvolution procedure is developed to set up a matrix for mulation to obtain the modal force description. Modal transformation is sub sequently used to obtain the spatial distribution of forces. The procedure is illustrated for a typical turbine blade subjected to a set of chosen exc itation forces distributed in the time and space domains. The computer simu lated response of the blade due to these forces is treated as the "measured response" and fed as input to the algorithm and the excitation forces are extracted, (C) 2001 Elsevier Science Ltd, All rights reserved.