In this work is studied the double pendulum system consisted of oval body parts. A designed shape of both elements provided a stabilized behaviour of the system, which usually in case of a double pendulum manifests that the response motion is highly sensitive to initial conditions and making it difficult to predict or control. The special focus in this analysis is kept on the oscillations and rotations of the second stage of the pendulum. The investigation was provided for the system, modelled by analytical approach and simulated numerically for wide range of initial condition to reach an energy harvesting effect by applied the twist dampers for both parts of pendulum. The energy harvesting efficiency is gained at modified mass moment of inertia of both parts of the system by its mass distribution and consequently shifted the gravity centres. Moreover, the system was innovated by introduced stoppers to avoid the rotations of the first stage of the pendulum at specific initial conditions.