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DYNAMIC RESPONSE AND FREE VIBRATION ANALYSIS OF STIFFENED SHELLS HAVING PARABOLIC CURVATURES WITH APPLICATIONS TO SHIPS AND OTHER SIMILAR STRUCTURES ARE THE MAIN FOCUS OF THIS STUDY. THE ENERGY APPROACH IS EMPLOYED TO THE DETERMINATION OF EQUIVALENT ORTHOTROPIC SHELL PARAMETERS OF PARABOLIC STIFFENED SHELLS. THE UNSTIFFENED EQUIVALENT SHELL HAS PROPER ACCURACY IN PREDICTING FREE VIBRATION CHARACTERISTICS AS WELL AS DYNAMIC RESPONSE OF THE MAIN STIFFENED SHELL. REDUCING THE GOVERNING EQUATION DIFFICULTIES WITH SUITABLE PRECISION IN FREE VIBRATION AND DYNAMIC RESPONSE ANALYSES IS THE MOST ADVANTAGE OF REPLACEMENT OF STIFFENED SHELLS WITH THEIR UNSTIFFENED EQUIVALENCES.
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