Action of torsion and axial moment in a new nonlinear cantilever-type vibration energy harvester

Abstract

The effects of composite motion involving action of torsion and axial moment on the vibrating element on characteristics of a new cantilever-type nonlinear electromagnetic vibration energy harvester are analyzed. The systems with softening and hardening action of the magnetic force are analyzed. The impact of the phenomenon on electromagnetic quantities of the system is investigated using the 2d analytical and 3d numerical models. The simulated and measured frequency-response characteristics show noticeable differences when the phenomenon is taken into account.

Surrogacy-Based Maximization of Output Power of a Low-Voltage Vibration Energy Harvesting Device

“…As shown in Figure 5, the output power increased as much as by 300%. The slight (14 percent) differences between the results in Table 3 and the maximum power measured for the optimized system are most likely due to complex (non-straight line) motional effects of magnets 3 on the induced emf in the physical harvester, which is a specific feature of the considered system that we identified and analyzed in [20], and is also due to inaccuracy of manufacturing of physical coils where the turn distribution does not match exactly one presented in Figure 4b. Though, the values of total coil resistance and inductance R c and L c measured using the laboratory multimeter agree to those calculated from formulas (3)-(9) within 2 and 6 percent, respectively (see Table 4).…”

“…Magnets 2 are stationary with respect to the armature and are used to develop an auxiliary magnetic force that brings nonlinear mechanical resonance into the system. The converter belongs to a class of nonlinear electromagnetic vibration energy harvesters whose insightful analysis including kinematic and dynamic effects can be found in [11] and [20,25]. Figure 1b shows variations of potential energy vs. relative displacement of permanent magnets (No.…”

“…In this work, the model segment of the routine involves determination of useful electromagnetic quantities by combining a 3D integral method, analytical formulas with a steady-state circuit simulation considering the electronic converter. For the purposes of the optimization process, it is not necessary to consider the whole system and its complicated kinematics resulting from the connection of the generator parts with elements of mechanical support [20]. As a consequence, the motional effects are modelled as simply as possible, assuming that the displacement of the moving element of the converter is sinusoidal in time, which means that the system operates at a prescribed frequency and magnitude.…”