Accurate Solutions of Conservative Nonlinear Oscillators by the Enhanced Cubication Method

Figure 6

Finite extensibility nonlinear oscillator for which 𝛼₁=1, 𝛼₂=1, 𝛼₃=−1, 𝜆₁=0, and 𝜆₂=1. The maximum relative error value of −3.451% between the approximate angular frequency value and the exact one occurs at the oscillation amplitude of 𝐴=0.9953 with a fitting parameter value of 𝜎=0.9985.