The effect of noise on the response of a vertical cantilever beam energy harvester

Machines, cars suspensions, buildings steel constructions etc. usually generate vibrations, which can be the excitement signal for piezoelectric energy harvesters. The piezoelectric patches attached to the vibrating construction have ability to convert mechanical energy of harmful vibrations into electrical energy.The goal of the study was to verify a finite element model of the piezoelectric beam energy harvester by comparing results of numerical simulations with those obtained experimentally. The stand used in the experiment consists of the cantilever beam with piezoelectric elements attached, which is excited by the base harmonic movement. The transverse displacements of the selected beam’s point and the base, and also the frequency of vibrations were observed and measured using an accelerometer and a B&K Pulse platform. A portable data acquisition module was used to quantify the voltage generated by the piezoelectric layers.The finite element model was built in ANSYS software. The beam and piezoelectric layers were modeled by twenty node elements with an additional electric degree of freedom for piezoelectric elements. A full piezoelectric matrix was used in the finite element analysis instead of a one-dimensional piezoelectric effect, which dominates in many analytical approaches. It allowed building a more accurate model of the system. The experimental tests and finite element method simulations were performed and acquired results were compared. The characteristics of voltage amplitude in the time and frequency domain were shown and discussed.

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Evaluation of a cantilever beam energy harvester subjected to impacts

10.20906/cps/cilamce2017-0710 ◽

2017 ◽

Author(s):

Arthur Guilherme Mereles ◽

Marcus Varanis ◽

José M. Balthazar ◽

Angelo M. Tusset ◽

Rodrigo Rocha ◽

...

Keyword(s):

Cantilever Beam ◽

Beam Energy ◽

Energy Harvester

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Auxetic cantilever beam energy harvester

Smart Structures and NDE for Industry 4.0, Smart Cities, and Energy Systems ◽

10.1117/12.2559327 ◽

2020 ◽

Author(s):

Saman Farhangdoust

Keyword(s):

Cantilever Beam ◽

Beam Energy ◽

Energy Harvester

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Axial and Transverse Vibration of a Cantilever Beam Energy Harvester with a Tip Mass with Axial and Transverse Eccentricity

Lecture Notes in Mechanical Engineering - Proceedings of the 14th International Conference on Vibration Problems ◽

10.1007/978-981-15-8049-9_57 ◽

2020 ◽

pp. 943-955

Author(s):

Seyda Ertarla ◽

Cevat V. Karadag ◽

Nezih Topaloglu

Keyword(s):

Cantilever Beam ◽

Transverse Vibration ◽

Beam Energy ◽

Energy Harvester ◽

Tip Mass

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Theoretical and Experimental Studies on MEMS Variable Cross-Section Cantilever Beam Based Piezoelectric Vibration Energy Harvester

Micromachines ◽

10.3390/mi12070772 ◽

2021 ◽

Vol 12 (7) ◽

pp. 772

Author(s):

Xianming He ◽

Dongxiao Li ◽

Hong Zhou ◽

Xindan Hui ◽

Xiaojing Mu

Keyword(s):

Power Density ◽

Cantilever Beam ◽

Cross Section ◽

Energy Harvester ◽

Variable Cross Section ◽

Vibration Energy ◽

Variable Cross ◽

Vibration Energy Harvester ◽

Piezoelectric Vibration Energy Harvester ◽

Piezoelectric Vibration

The piezoelectric vibration energy harvester (PVEH) based on the variable cross-section cantilever beam (VCSCB) structure has the advantages of uniform axial strain distribution and high output power density, so it has become a research hotspot of the PVEH. However, its electromechanical model needs to be further studied. In this paper, the bidirectional coupled distributed parameter electromechanical model of the MEMS VCSCB based PVEH is constructed, analytically solved, and verified, which laid an important theoretical foundation for structural design and optimization, performance improvement, and output prediction of the PVEH. Based on the constructed model, the output performances of five kinds of VCSCB based PVEHs with different cross-sectional shapes were compared and analyzed. The results show that the PVEH with the concave quadratic beam shape has the best output due to the uniform surface stress distribution. Additionally, the influence of the main structural parameters of the MEMS trapezoidal cantilever beam (TCB) based PVEH on the output performance of the device is theoretically analyzed. Finally, a prototype of the Aluminum Nitride (AlN) TCB based PVEH is designed and developed. The peak open-circuit voltage and normalized power density of the device can reach 5.64 V and 742 μW/cm3/g2, which is in good agreement with the theoretical model value. The prototype has wide application prospects in the power supply of the wireless sensor network node such as the structural health monitoring system and the Internet of Things.

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