Finite element model updating of a Westland Lynx XZ649 helicopter tail is presented.
Eigenvalue sensitivities with respect to Young’s modulus and mass density are used. Large groups
based on material input data were divided to form smaller subgroups so that those parts of the
model responsible for errors in the predicted eigenvalues were located. A particular new
development was the use of parameter clustering based on the similarity of different columns of the
sensitivity matrix. Finally the finite element model was updated successfully with regard to the
lower frequency tail-bending modes.
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