Application of He's parameter-expansion method to an oscillation of a mass attached to a stretched elastic wire

This Letter applies He's parameter-expansion method (PEM) to a nonlinear oscillation of a mass attached to a stretched wire. The method, taking full advantage of the perturbation method, does not depend upon small parameter assumption. One iteration step provides an approximate solution which is valid for the whole solution domain. The method can be easily extended to other nonlinear oscillations.