Abstract
This paper presents an analytical approach for the development of a new wideband piezoelectric energy harvesting system. The proposed model is based on Adomian decomposition method to derive the dynamic response of the general non-uniform smart structures under external environmental excitations over a wide frequency domain efficiently harvesting the subsequent vibrational energy. The steady-state response of a nonlinearly tapered piezoelectric harvester subjected to harmonic base motion is obtained, and the higher potential electromechanical outputs compared with traditional uniform harvester are analytically derived. Afterward, a group of nonlinearly tapered cantilevers with the same volume and length but different taper ratios and surface bonded piezoelectric layers are assembled together in order to build a broadband piezoelectric energy harvester. Through numerical studies, it is proven that with the proposed non-uniform configuration, the new energy harvester design can function effectively and efficiently with high voltage output over a wide frequency range. The designed wideband harvester can automatically activate one of the non-uniform bimorphs to resonate at particular ambient vibration frequencies and eventually reach the maximum electromechanical output. Based on the proposed theoretical model, an optimum structural design for the wideband piezoelectric energy harvester in the required operational frequency range can be efficiently achieved.
Highlights
Energy harvesting from environment energy sources has become a vibrant study field and attracted huge attention in recent years due to numerous applications
Adomian decomposition method (ADM), the steady-state dynamic behavior of smart structures with non-uniform geometry and structural strain-rate damping under harmonic the motion is structuresand withthe non-uniform andfor structural strain-rate damping under harmonic motion is obtained closed-formgeometry expressions the electromechanical outputs as frequency response obtained and the closed-form expressions for the electromechanical outputs as frequency response functions are derived
A wideband piezoelectric energy harvester comprising a group of nonlinearly functions are derived
Summary
Energy harvesting from environment energy sources has become a vibrant study field and attracted huge attention in recent years due to numerous applications. Powering wireless electronics and sensors with very low electrical power requirements at the location without the limitations of batteries is pleasing for various automation and monitoring systems. Energy harvesters are designed to transform the ambient energy into a usable power form to supply the small wireless systems throughout their lifespan. Vibration-based energy harvesting has become more appealing and has received further attention. The three mechanical conversion mechanisms of vibration energy to electrical energy are: electrostatic, electromagnetic, and piezoelectric [1]. The small dimension, custom shape fabrication capability, and great power conversion potential are the major benefits of the piezoelectric methodology for vibration-based energy harvesting [2]. Even a minor external excitation results in significant amount of produced voltage without demanding any low-efficient initiation mechanical mechanism [3]
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