Abstract
A cubic Bézier-profile plate for multimodal vibration energy harvesting was developed. The design of the plate was based on an optimization procedure in which the profile of the plate was optimized via the parameters of a cubic Bézier curve to meet the requirements. The multimodal energy harvesting of the plate exploited its first bending mode and its first twisting mode. The conversion of vibration energy into electrical energy was by electromagnetic induction with a magnet attached to a corner of the plate. These two closely spaced vibration modes achieved the multi-modal energy harvesting of the device. Prototypes of the device were manufactured using a numerical-control machining process. The experimental results were in good agreement with the design specifications. With the same base lengths, height, and thickness, the maximum von Mises stress of the proposed plate was much lower due to its bell-shaped profile. The cubic Bézier curve chosen for the plate profile was effective for design of the closely-spaced multimodal vibration energy harvester. With the flexibility of its controllable parametric curve, a high design freedom of the energy harvester with specified frequency ratios could be achieved.
Highlights
Vibration energy harvesting devices are operated at their first resonance frequency for single-frequency ambient energy harvesting [1]
When the ambient vibration is at a single frequency, the design of the energy harvesting device can be tailored to the ambient frequency available
A considerable effort was focused on the development of multimodal vibration energy harvesters or power generators due to the multi-frequency content of the vibration energy sources
Summary
Vibration energy harvesting devices are operated at their first resonance frequency for single-frequency ambient energy harvesting [1]. Masana and Daqaq [11] investigated the energy-harvesting performance of a bistable piezoelectric beam in its monostable and bistable configurations They found that for a bistable beam with shallow potential wells, the activation of interwell dynamics can generate large voltage outputs in the low-frequency range. Due to the large mode numbers in the frequency range below 1 kHz, their double-wall device exhibited a wide bandwidth for vibration energy harvesting. Parametric-curve-based geometry is flexible enough to Energies 2021, 14, 4735 give a much better control over the profile of plates to achieve the design goals of desired frequency ratios and high vibration amplitudes. Hosseni and Hamedi [35] reported that variation in geometry and configuration of energy harvesting devices could be utilized to increase the output power In this investigation, we developed a plate with a cubic Bézier profile for multimodal vibration energy harvesting. The performance of the proposed design was compared with that of a trapezoidal design in terms of the closeness of the first modal frequency to the second modal frequency and the stress in the plate for multimodal energy harvesting
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