spi.meca.vibr nlin.nlin-cd math.math-pr math.math-st spi.meca.stru spi.meca.solid spi.meca.geme
FUTURE STEPS

 Investigate the effects of a stochastic component combined with the harmonic external forcing;

 Investigate the electrical load model influence on the system dynamic response;

 Investigate the effects of chaos controlling strategies on energy recovering (Leonardo de la Roca -leonardo.roca@uerj.br);

 Experimental stand analysis;

INTRODUCTION

  São Paulo, July 29th -August 9th, 2019 BIFURCATION ANALYSIS OF A BISTABLE NONLINEAR ENERGY HARVESTING SYSTEM Vinicius Gonçalves Lopes, Americo Cunha Jr. Universidade do Estado do Rio de Janeiro (UERJ) Núcleo de Modelagem e Experimentação Computacional (NUMERICO) recovers energy from secondary sources as mechanical vibration (piezoelectric), heat (thermoelectric) and light (photoelectric). Some examples among its most promising applications are supporting Internet of Things (IoT) devices, boarded small electro-electronic equipment or even pacemarkers [3][4][5]. The study aims to Identify:  The forcing conditions which provides the best voltage regular responses;  The excitation parameters which can be related with the chaos occurrence;  The forcing parameters which provides the best voltage signals waveforms;  The forcing parameters most able to improve the energy recovering;  Time series analysis provides a detailed system dynamics overview;  Forcing parameters sampling ordering affects the voltage results (hysteresis);  Low amplitudes combined with low frequencies provides regular dynamics; Chaos occurrence can be related with the harmonic forcing frequency variations;Source:[START_REF] Abdelkareem | Vibration energy harvesting in automotive suspension system: A detailed review[END_REF] (above),[START_REF] Sun | A flexible transparent one-structure tribo-piezopyroelectric hybrid energy generator based on bio-inspired silver nanowires network for biomechanical energy harvesting and physiological monitoring[END_REF] (right).

FIGURE 2 -

 2 FIGURE 2 -Examples of energy harvesting technologies applications.

FIGURE 1 -FIGURE 4 -

 14 FIGURE 1 -Energy harvesting concept.

FIGURE 3 -

 3 FIGURE 3 -Energy harvester device [2].

FIGURE 5 -

 5 FIGURE 5 -Sampled voltage time series from diagrams for Ω = 0.8 and different amplitudes.

FIGURE 6 -

 6 FIGURE 6 -In the left, forward (blue scale) and backward (red scale) voltage bifurcation diagrams for 𝑓 ∈ [0.019: 0.032: 0.275] and 0.1 ≤ Ω ≤ 1.4; in the right, diagrams sampled for 𝑓 = 0.083.

FIGURE 7 -

 7 FIGURE 7 -Sampled voltage time series from diagrams for 𝑓 = 0.083 and different frequencies.