Center of Excellence in Design, Robotics and Automation, Mechanical Engineering Department, Sharif University of Technology, Azadi Ave, PO 11365-11155, Tehran, Iran
In this paper nonlinear vibration of transversely vibrated beam with large slenderness and immovable ends is analyzed using Variational Iteration Method (VIM). The nonlinear partial differential equation of motion is converted to a set of coupled ordinary differential equations using Galerkin technique. Two mode expansion for the system response is considered and second order analytical solution of the equations is obtained using VIM. Two algebraic coupled equations are also developed to find the nonlinear frequencies of the system. Numerical Simulations are performed for various initial conditions. Close agreement between the numerical and analytical results is achieved. Also the frequency analysis is performed for a range of initial amplitudes of vibration.