Nonlinear Dynamics and Power Generation on a New Bistable Piezoelectric-Electromagnetic Energy Harvester

Abstract

This paper focuses power generation and nonlinear dynamic behaviors on a new bistable piezoelectric-electromagnetic energy harvester. Three different kinds of piezoelectric cantilever beam structures, which include the monostable piezoelectric cantilever beam, the bistable piezoelectric cantilever beam with spring and magnet, and the bistable piezoelectric cantilever beam with spring, magnet, and coil, are designed. The power generation efficiency and dynamic behaviors for each structure are experimentally studied, respectively. Due to the spring introduced, the system easily goes through the potential barrier. Experimental results show that the power generation structure of the bistable piezoelectric-electromagnetic harvester can vibrate between two steady states in a wider range of the frequency. Therefore, the effective frequency bandwidth is broadened about 2 Hz when the spring is introduced under the condition of the suitable magnetic distance. Comparing with the power generation efficiency for three different kinds of structures, it is found that the bistable piezoelectric-electromagnetic harvester has the optimum characteristics, which include the optimal magnetic distance of 15 mm, the optimal load of 8 MΩ, and the parameters variation law of coils. For this structure, the influences of the external excitation and the magnetic distance on the output voltage and dynamic behaviors of the system are examined.

Numerical Simulations and Control of Offshore Energy Harvesting Using Piezoelectric Materials in a Portal Frame Structure

“…Figure 4 presents the number of iterations to minimize the function described by equation (14). During the PSO optimization process, all the solutions converged to the same value.…”

“…Establishing the most important parameters that the highest amount of energy is obtained, the optimization process using the PSO algorithm is carried out for the range of the parameters depicted in equation (14).…”

“…Experimental results showed that the V-shaped energy harvester improved the frequency response characteristic and the output performance of the electrical energy. In [14], three different kinds of energy harvesting generators are designed: one considering the monostable piezoelectric cantilever beam structure and the other two considering bistable piezoelectric cantilever beam structures. Numerical and experimental analyses were considered for power generation and dynamic behaviors of the different structures.…”

Computational Analysis on Numerical Simulation of Internal Flow Physics for Pump as Turbine in Renewable Small Hydro Energy Generation

“…Complex unsteady turbulent flow existence in PAT discloses the occurrence a more significant impact of vortex flow pattern. Maximum turbulence is located around trailing edge next to leading edge with lower turbulence located at the suction side [32][33][34][35][36][37]. As rotational speed increases, turbulence increases as well.…”

Response Analysis of the Tristable Energy Harvester with an Uncertain Parameter

“…In the early stage, the resonant-based vibration harvesters have been widely used to generate energy, which could only achieve considerable energy harvesting performance at or near its resonant frequency [5,6]. To remedy this problem, many structural optimization designs [7,8] and technologies including resonance tuning technique [9][10][11][12], monostable technique [13][14][15][16][17], bistable technique [18][19][20][21][22] and tristable technique [23][24][25][26][27] have been proposed. Theoretical analysis and experimental results have shown that the nonlinear harvester could improve the ability to harvest energy under certain circumstances.…”