A method of dynamically reconstructing the stress and strain field of a turbine blade includes providing a set of response measurements from at least one location on the turbine blade, upper frequency limit And band-pass filtering the set of response measurements based on the lower frequency limit (32), local minima and local maximums of the set of response measurements. Determining (33) the upper envelope and lower envelope of the set of response measurements from maxima (33), and calculating the candidate intrinsic mode function (IMF) from the upper envelope and lower envelope of the set of response measurements. Step 34, providing a N × N mode shape matrix for the turbine blade if the candidate IMF is an actual IMF, 37, where N is the number of degrees of freedom of the turbine blade degrees of freedom), and calculating the response to the mode shapes of the mode shape matrix and the response to other positions on the turbine blade from the actual IMF.
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