Cantilever Beam For Energy Harvesting Research Articles

Modeling and characterization of permendur cantilever beam for energy harvesting

This article presents the development of a cantilever harvester made of permendur with tip excitation. In the beginning, the dynamic behavior of the tip-mass beam harvester subjected to a harmonic bending force at the free-end has been studied. Also, the magneto-mechanical model, rotating unbalance equations and Faraday's Law have been combined to present the general model for generated power. Furthermore, damping coefficients have been elaborately measured and considered in the modeling of magnetostrictive harvester and prediction of optimum load to generate the maximum power. Good agreement between analytical and experimental results shows that the model is able to predict the behavior of harvester under the vibration with tip excitation and can find the optimum external load to have maximum power. Experiment results show that the maximum output power is 6.81 μW/cm3 and this power happens when the harvester is connected to a 0.63 Ω external load. Compared to other magnetostrictive harvesters, Permendur shows lower power density. However, its harvested power is enough to energize μW electrical devices at a reasonable cost. The presented results in this paper can be utilized as a design guideline for future investigations to optimize vibration-based magnetostrictive energy harvesters with tip excitation.

Magneto-mechanical optimization and analysis of a magnetostrictive cantilever beam for energy harvesting

Abstract The analysis of a magnetostrictive cantilever for energy harvesting purposes is addressed. The focus of the work is on outlining, by a thorough experimental study, the basic phenomena affecting the behavior of such systems and, in particular, how the geometry of the physical structure can affect the overall performance of the harvester. Several harvester prototypes have been realized by bonding together one or more magnetostrictive laminations to Al sheets. Further, the influence of the magnetic bias is investigated by exploiting permanent magnets in different positions of the cantilever. The results are discussed in detail and a converted power up to 40 mW is observed at 4 g impressed acceleration of the sample.

Design and analysis of smart piezo cantilever beam for energy harvesting

ABSTRACTPiezoelectric material can be used to generate the electrical energy when it is compressed or expanded. This paper deals the modelling and design of a Cantilever Beam for Piezoelectric Energy Harvesting on which Piezoelectric Ceramic Lead Zirconate Titanate (PZT) patches are bonded. There may be two configurations one is “Unimorph” in which only one PZT patch is used and the other is “Biomprph” in which two PZT patch are used to generate the energy. The beam is assumed as Euler-Bernoulli beam. The PZT patch is also treated as Euler-Bernoulli beam element. The contribution of mass and stiffness of PZT patch in the design of entire structure are also considered. The beam is modelled using four Finite Elements. PZT patch(s) can be bonded near the fixed end of the beam, near the free end of the beam or other locations in the middle of the beam. A harmonic sinusoidal force is applied. The design uses first vibratory mode. It can be concluded from the work that best result is obtained when the PZT patches are bonded near the fixed end.