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Defining constraint

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Hello Group


I wanted to know whether its is possible to define output as a constraint in optimisation.


I am validating my modell with frequency response test


I want to vary values of  Material properties like Emodulus, G modulus so that at certain frequencies Frequency Response Function FRF (velocity) is say (+\- 10 % ) of the FRF calculated by test.




Vary values of


E = 1000 mpa to 2000 mpa

G= 200 mpa to 400 mpa


so that

at node 256


Frq         frf (test)     frf(simulation)

5hz          0.256         (+/- 0.01) of 0.256

10hz        0.586         (+- 0.01) of 0.586

15 hz       1.457          (+- 0.01) of 1.457 etc


Is it possible to define constraint this way


a suggestion or example tutorial would be quit helpful


Thanks and Regards


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