New and efficient design of multimode piezoelectric vibration energy harvester for MEMS application

Artificial Intelligence-Based Optimization of a Bimorph-Segmented Tapered Piezoelectric MEMS Energy Harvester for Multimode Operation

“…Therefore, the tapered structure shows an improved performance in all the modes. The uniform strain distribution along the length of the tapered beam, compared to a nontapered beam (taper ratio = 1), improves the voltage generation of the tapered structure [4]. A pattern is observed that the operating frequency reduces with the tapering ratio in all the vibration modes, while the taper ratio for the maximum output generation is different for all the modes.…”

“…The tapered beam design of the linear PVEH produces greater output voltage, as the beam will experience a higher strain for a particular mechanical input. A trapezoidal cantilever beam provides a more efficient and more robust design than a conventional rectangular beam, as the distribution of the strain is more uniform across the length of the beam [3,4]. Almeida et al concluded that thinner substrates yield harvesters with a better energy conversion factor and a higher output voltage [5].…”

Correlating multimode strain and electrode configurations for high-performance gradient-index phononic crystal-based piezoelectric energy harvesting

“…Based on multimodal strain analysis, various EH device designs such as segmented piezoelectric ceramics and patterned electrode configurations, whereby the strain node is not located within the same active piezoelectric layer, have been proposed. 24–26…”

“…Based on multimodal strain analysis, various EH device designs such as segmented piezoelectric ceramics and patterned electrode configurations, whereby the strain node is not located within the same active piezoelectric layer, have been proposed. [24][25][26] Beyond conventional energy harvesting research efforts on materials, devices, and circuits, a further disruptive approach for power enhancement in energy harvesting is required. Phononic crystals (PnCs) and acoustic metamaterials (AMMs) are artificially engineered structures with a remarkable wave manipulation capability owing to their unconventional properties, such as bandgap, negative bulk modulus, negative mass density, and negative refractive index.…”

Multi-Objective Topology Optimization of a Broadband Piezoelectric Energy Harvester

“…In [ 9 ], a bi-directional, U-shaped structure with cross-connected beams was introduced that can capture vibration in 3D space. In [ 10 , 11 ], ”star”- and a ‘’pizza”-shaped arrays were proposed and, in [ 12 ], a trapezoidal geometry and optimal segmentation for higher modes were presented. Most of these recent designs are based on combining multiple simple beam PEHs with different resonant frequencies into an array, which is often referred to as an ”in parallel” configuration.…”