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Relocation of the resonance frequencies of the un-damped systems to desired values adding grounded springs is addressed. For the calculatıon of the necessary springs’ stiffnesses, a method based on Sherman-Morrison (SM) formula is presented. The method uses receptances of the original system and it needs neither analytical nor modal models. Numerical simulation shows that the method is very effective. Keywords—natural frequency, receptance, inverse modification, Sherman-Morrison formula

Relocation of Resonance Frequencies of Undamped Systems Adding Grounded Springs