Journal ArticleDOI
Potential well escape in a galloping twin-well oscillator
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TLDR
In this paper, three different analytical approaches are implemented: (i) the method of harmonic balance, (ii) a method of multiple scales using harmonic and elliptic basis functions, and (iii) the Melnikov criterion.Abstract:
When a bi-stable oscillator undergoes a supercritical Hopf bifurcation due to a galloping instability, intra-well limit cycle oscillations of small amplitude are born. The amplitude of these oscillations grows as the flow speed is increased to a critical speed at which the dynamic trajectories escape the potential well. The goal of this paper is to obtain a simple yet accurate analytical expression to approximate the escape speed. To this end, three different analytical approaches are implemented: (i) the method of harmonic balance, (ii) the method of multiple scales using harmonic and elliptic basis functions, and (iii) the Melnikov criterion. All methods yielded an identical expression for the escape speed with only one key difference which lies in the value of a constant that changes among the different methods. A comparison between the approximate analytical solutions and a numerical integration of the equation of motion demonstrated that the escape speed obtained via the multiple scales method using the elliptic functions and the Melnikov criterion are in excellent agreement with the numerical simulations. On the other hand, the first-order harmonic balance technique and the multiple scales using harmonic functions provide analytical estimates that significantly underestimate the actual escape speed. Using the Melnikov criterion, the influence of parametric and additive noise on the escape speed was also studied.read more
Citations
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Journal ArticleDOI
A review of flow-induced vibration energy harvesters
TL;DR: In this article , the state-of-the-art advances on flow-induced vibration energy harvesters in terms of their working principles, categories, enhancement methods, model derivation and calculation methods, influence of interface circuits, and energy harvesting efficiency calculation methods are reviewed.
Journal ArticleDOI
Dynamics of the double-beam piezo–magneto–elastic nonlinear wind energy harvester exhibiting galloping-based vibration
TL;DR: In this article, a double-beam piezo-magneto-elastic nonlinear wind energy harvester (DBPME-WEH) is proposed to enhance the performance of the galloping-based vibration energy harvesting.
Journal ArticleDOI
Magnetically coupled piezoelectric galloping-based energy harvester using a tandem configuration
TL;DR: In this paper, a piezoelectric galloping-based energy harvester that uses a magnetic coupling effect to improve its energetic performance is proposed, which includes two elastic structures with bluff bodies arranged in a tandem configuration and a pair of repulsive magnets installed between the two bluff bodies.
Journal ArticleDOI
Potential well evolution and metastable dynamics of bistable asymmetric laminated composite square shallow shell under external and parametric excitations
TL;DR: In this article , the authors studied the occurrence conditions of the metastable chaos by analyzing the potential well evolution from the double potential wells to triple potential wells in the bistable asymmetric laminated composite square shallow shell under the foundation excitation.
Journal ArticleDOI
Potential well evolution and metastable dynamics of bistable asymmetric laminated composite square shallow shell under external and parametric excitations
TL;DR: In this paper, the authors studied the occurrence conditions of the metastable chaos by analyzing the potential well evolution from the double potential wells to triple potential wells in the bistable asymmetric laminated composite square shallow shell under the foundation excitation.
References
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The Hopf Bifurcation and Its Applications
TL;DR: The Hopf bifurcation refers to the development of periodic orbits ("self-oscillations") from a stable fixed point, as a parameter crosses a critical value as mentioned in this paper.
Journal ArticleDOI
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TL;DR: A new method based on the exploitation of the dynamical features of stochastic nonlinear oscillators is shown to outperform standard linear oscillators and to overcome some of the most severe limitations of present approaches.
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Journal ArticleDOI
MEMS electrostatic micropower generator for low frequency operation
Paul D. Mitcheson,P. Miao,Bernard H. Stark,Eric M. Yeatman,Andrew S. Holmes,Timothy C. Green +5 more
TL;DR: In this paper, the authors describe the analysis, simulation and testing of a microengineered motion-driven power generator, suitable for application in sensors within or worn on the human body.
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Review of Microscale Magnetic Power Generation
TL;DR: The history, current state of the art, and ongoing challenges for compact (less than a few cubic centimeters) magnetic power generation systems in the microwatts to tens of watts power range are discussed.
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