The development of two Broadband Vibration Energy Harvesters (BVEH) with adaptive conversion electronics

Clingman, Dan J.; Thiesen, J.

doi:10.1117/12.2263208

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Bistable structures are central in the design of many functional devices [9][10][11][12][13], whose internal energy comprises two minima, separated by a maximum, representing the barrier to a fast transition between two stable states. This snap-through instability can be exploited to cause relatively large displacements, or rotations, with low work for actuation, offering potential applications in several engineering domains, including micro-electromechanical systems [14,15], robotics [16,17], energy harvesting [18,19], actuators [20,21], origami structures [22,23] and deployment mechanisms [24]. Bistable beams can be classified into two categories [25]: (i) preshaped, which do not possess residual stresses and (ii) pre-compressed, which are stressed post-production to exhibit the first buckling-mode configuration [26].…”

Section: Introductionmentioning

confidence: 99%

Snap buckling of bistable beams under combined mechanical and magnetic loading

Abbasi

Sano

Yan

et al. 2023

Phil. Trans. R. Soc. A.

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We investigate the mechanics of bistable, hard-magnetic, elastic beams, combining experiments, finite-element modelling (FEM) and a reduced-order theory. The beam is made of a hard magneto-rheological elastomer, comprising two segments with antiparallel magnetization along the centreline, and is set into a bistable curved configuration by imposing an end-to-end shortening. Reversible snapping is possible between these two stable states. First, we experimentally characterize the critical field strength for the onset of snapping, at different levels of end-to-end shortening. Second, we perform three-dimensional FEM simulations using the Riks method to analyse high-order deformation modes during snapping. Third, we develop a reduced-order centreline-based beam theory to rationalize the observed magneto-elastic response. The theory and simulations are validated against experiments, with an excellent quantitative agreement. Finally, we consider the case of combined magnetic loading and poking force, examining how the applied field affects the bistability and quantifying the maximum load-bearing capacity. Our work provides a set of predictive tools for the rational design of one-dimensional, bistable, magneto-elastic structural elements. This article is part of the theme issue ‘Probing and dynamics of shock sensitive shells’.

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Section: Introductionmentioning

confidence: 99%

Snap buckling of bistable beams under combined mechanical and magnetic loading

Abbasi

Sano

Yan

et al. 2023

Phil. Trans. R. Soc. A.

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“…Thanks to these advantages, bistable structures are extensively harnessed in various engineering domains, such as MEMS [1,2,3], robotics [4,5,6], energy harvesting [7,8,9], actuators [10,11], origami technology [12,13], signal propagation [14], and deployment mechanisms [15]. In addition, bistable mechanisms possess high reliability and high structural simplicity, and consume relatively little power when incorporated into mechanical systems.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling for rapid design of bistable buckled beams

Yan

Mehta

2019

Theoretical and Applied Mechanics Letters

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Double-clamped bistable buckled beams, as the most elegant bistable mechanisms, demonstrate great versatility in various fields, such as robotics, energy harvesting, and MEMS. However, their design is always hindered by time-consuming and expensive computations. In this work, we present a method to easily and rapidly design bistable buckled beams subjected to a transverse point force. Based on the Euler-Bernoulli beam theory, we establish a theoretical model of bistable buckled beams to characterize their snap-through properties. This model is verified against the results from an FEA model, with discrepancy less than 7%. By analyzing and simplifying our theoretical model, we derive explicit analytical expressions for critical behavioral values on the force-displacement curve of the beam. These behavioral values include critical force, critical displacement, and travel, which are generally sufficient for characterizing the snap-through properties of a bistable buckled beam. Based on these analytical formulas, we investigate the influence of a bistable buckled beam's key design parameters, including its actuation position and precompression, on its critical behavioral values, with our results validated by FEA simulations. This way, our method enables fast and computationally inexpensive design of bistable buckled beams and can guide the design of complex systems that incorporate bistable mechanisms.

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A Self-Propelled Mechanism to Increase Range of Bistable Operation of a Piezoelectric Cantilever-Based Vibration Energy Harvester

Singh

Pathak

Weber

et al. 2018

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In our previous works, we presented a method to increase the harvested energy from vibrations using a piezoelectric cantilever and to increase the frequency range of operation by introducing bistability with the use of magnetic repulsion. However, for small excitations, the cantilever may not be able to overcome the magnetic repulsive force but vibrate at one of its two equilibrium positions with reduced amplitude. This work introduces a method of increasing the range of excitations over which the operation remains bistable. This is achieved by spring loading one of the magnets, previously on a fixed support, allowing motion in one dimension only, toward and away from the cantilever in the horizontal plane. Configured so, as the cantilever moves toward this magnet, the repulsion due to the cantilever-mounted magnet pushes the spring-loaded magnet away, increasing distance, and thus, reducing magnetic force between them, required to be overcome by external excitations for bistable operation. Similarly, as the cantilever moves away, the spring pushes the magnet closer to the cantilever-mounted magnet, increasing vibration amplitude. Thus, the spring introduces a negative feedback which favors bistable operation over an increased range of excitations. This completely mechanical method requires no additional energy cost. Peak power gains of up to 90 and a decrease in excitation voltage of up to 60% were observed over the fixed magnet.

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The development of two Broadband Vibration Energy Harvesters (BVEH) with adaptive conversion electronics

Cited by 3 publications

References 2 publications

Snap buckling of bistable beams under combined mechanical and magnetic loading

Snap buckling of bistable beams under combined mechanical and magnetic loading

Analytical modeling for rapid design of bistable buckled beams

A Self-Propelled Mechanism to Increase Range of Bistable Operation of a Piezoelectric Cantilever-Based Vibration Energy Harvester

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