New PDF release: Advances in Energy Harvesting Methods

By Niell Elvin, Visit Amazon's Alper Erturk Page, search results, Learn about Author Central, Alper Erturk,

Advances in power Harvesting Methods provides a state of the art knowing of numerous features of power harvesting with a spotlight on: broadband strength conversion, new thoughts in digital circuits, and novel fabrics. This publication covers fresh advances in power harvesting utilizing varied transduction mechanisms; those comprise tools of functionality enhancement utilizing nonlinear results, non-harmonic different types of excitation and non-resonant strength harvesting, fluidic strength harvesting, and advances in either low-power electronics in addition to fabric technology. The participants comprise a quick literature assessment of previous examine with every one bankruptcy for extra reference.

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One physically realizable energy harvester with bistable nonlinear stiffness was proposed by Ramlan et al. [49], utilizing a so called “snap-through” mechanism. The setup consisted of two linear oblique springs connected to a mass and a damper, as shown in Fig. 33, yielding a nonlinear restoring force in the x direction. This mechanism has the effect of steepening the displacement response of the mass as a function of time, resulting in a higher velocity for a given input excitation. Numerical results revealed that this mechanism could provide much better performance than the linear mechanism when the excitation frequency was much less than the natural frequency.

20]. 3) By tuning the vertical relative distance Dy of the two magnets, the resonance could be tuned bidirectionally. 5 cm, as 2 Broadband Vibration Energy Harvesting Techniques 25 Fig. 8 (a) Schematic of proposed resonance-tunable harvester and (b) open- and short-circuit resonant frequencies with variable Dy ([21], copyright: SPIE) Fig. 9 (a) Schematic of tuning mechanism and (b) resonant frequency versus distance between two magnets [22] shown in Fig. 8b. 38 Hz, including the resonant frequency shift from short-circuit to open-circuit condition due to the piezoelectric coupling.

29c. However, such a hardening device only broadened the frequency response in one direction (the peak response shifts to the right). Stanton et al. [51] proposed another monostable device for energy harvesting using the piezoelectric effect. The device consisted of a piezoelectric beam with a magnetic end mass interacting with the fields of oppositely poled stationary magnets, as shown in Fig. 30. The system was modeled by an electromechanically coupled Duffing’s equation similar to Eq. 9), except that the piezoelectric coupling term ÄV should be added as in Eq.

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