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Advances in strength Harvesting Methods provides a state of the art knowing of various elements of power harvesting with a spotlight on: broadband strength conversion, new thoughts in digital circuits, and novel fabrics. This booklet covers contemporary advances in power harvesting utilizing varied transduction mechanisms; those contain tools of functionality enhancement utilizing nonlinear results, non-harmonic varieties of excitation and non-resonant strength harvesting, fluidic power harvesting, and advances in either low-power electronics in addition to fabric technological know-how. The participants comprise a short literature assessment of earlier study with every one bankruptcy for extra reference.

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By applying a voltage on the actuators, both ends of the actuators were deflected by y(Vop ), as shown in Fig. 11b. Such deformation caused an additional hinge moment and thus a stiffer structure. One of their fabricated resonators achieved a large tuning of over 30% from an initial frequency of 78 Hz, using a tuning voltage of only ˙5 V, as shown in Fig. 11c. A discrete control circuit, which exploited the phase characteristic of the resonator, was implemented to actively control the resonance tuning.

Fig. 21 Schematic of two beams with two end masses elastically connected ([41], copyright: SAGE Publications) Fig. 2 Cantilever Array Configuration Different from the discrete bandwidth corresponding to the multiple modes of a single beam, multiple cantilevers or cantilever arrays integrated in one energy harvesting device can easily achieve continuous wide bandwidth if the geometric parameters of the harvester are appropriately selected. Similar to the configurations in Sect. 1, sophisticated interface circuits are required to avoid charge cancelation due to the phase difference between the cantilevers in array configurations.

21 shows the schematic of the design, and Fig. 22 shows the theoretical prediction of power output versus frequency. Similar to Wu et al. [40], two close modes and thus wider bandwidth could be achieved as compared to a single-beam harvester. The amplitude and location of the resonances were found to be sensitive to the end spring and end masses. Kim et al. [42] developed a 2DOF harvester composed of two piezoelectric cantilevers connected by a common proof mass, as shown in Fig. 23a. Although 2 Broadband Vibration Energy Harvesting Techniques 39 Fig.

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