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The objective of this paper is to present an analytical investigation to analyze thevibration of parametrically excited oscillator with strong cubic negative nonlinearity based onMathieu-Duffing equation. The analytic investigation was conducted by using He's homotopy-perturbation method (HPM). In order to obtain the analytical solution of Mathieu-Duffing equation, homotopy-perturbation method has been utilized. The Runge-Kutta's (RK) algorithm was used to solve the governing equation via numerical solution. Finally, to demonstrate the validity of the proposed method, the response of the oscillator, which was obtained from approximatesolution, has been shown graphically and compared with that of numerical solution. Afterward, theeffects of variation of the parameters on the accuracy of the homotopy-perturbation method were studied

Comparative Vibration Analysis of a Parametrically Nonlinear Excited Oscillator Using HPM and Numerical Method