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This work was supported by the program of the Ministry of Science and Higher Education in Poland under
the project DIALOG 0019/DLG/2019/10 in the years 2019- 2021.
In this paper, a study on modelling energy harvesting efficiency of a quasi-zero stiffness system
is presented. Mechanical characteristics of the system are identified, and the effect of its stiffness and
geometry on the function describing energy potential barrier is determined. It has been shown numerically
that an increase in equivalent stiffness of the quasi-zero stiffness system limits the potential barrier width.
On the other hand, increased the spacing between compensating springs results in increased barrier width.
Simulation results of the quasi-zero stiffness system are compared with those obtained for a triple-well
system with permanent magnets. Based on mathematical models, multi-color diagrams depicting the largest
Lyapunov exponent are plotted. The effect of selected values of external excitation frequency and amplitude
on the efficiency of energy harvesting is determined. The rms value of time sequence is taken as a measure
of the energy harvesting efficiency. Obtained numerical results are plotted as phase trajectories.