A multi-cell piezoelectric device for tunable resonance actuation and energy harvesting

Secord, Thomas W.; Mazumdar, Anirban; Asada, H. Harry

doi:10.1109/robot.2010.5509158

Cited by 5 publications

(6 citation statements)

References 26 publications

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“…The cantilevers in array are usually connected in series to generate large output voltage or parallel to generate large current. The optimal impedance of series connection is the resistance in series of each matched impedance, the optimal impedance of parallel connection is the resistance in parallel of each matched impedance (Al-Ashtari et al, 2013;Dang et al, 2011;Secord et al, 2010;Wen et al, 2014). Due to the existence of phase between the cantilevers, the power after connection did not reach 100% of the sum of all cantilevers.…”

Section: Connection Of Cantilever Arraymentioning

confidence: 99%

Fan-structure wind energy harvester using circular array of polyvinylidene fluoride cantilevers

Bai

Song

Dong

et al. 2016

Journal of Intelligent Material Systems and Structures

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A fan-structure piezoelectric energy harvester was proposed and tested in order to collect wind energy. Polyvinylidene fluoride was chosen due to its flexibility and longevity when compared to lead zirconate titanate. The impact-induced piezoelectric energy harvester consists of a stator and a rotor and a circular array of four cantilevers, utilize the rotor blades’ periodic impact on the free end of the cantilevers to generate oscillatory motion of cantilevers. A circular array of polyvinylidene fluoride cantilevers was fixed around the rotor in order to increase output power, save space at the same time. Static and transient characteristics of different cantilevers were investigated using finite element method and the result showed that polyvinylidene fluoride triangular cantilever performs the best in output voltage and power. Under the condition of optimal impedance and optimal overlap distance, a sum AC output power of four cantilevers without connection to each other approach to 0.75 mW was measured at the wind speed of 7 m/s when the blade number of rotor is 7 or 9. Two branches 0.27 mW DC output power was obtained when each two cantilevers in parallel connection in the case of full-wave rectification of each cantilever at the wind speed of 7 m/s.

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Section: Connection Of Cantilever Arraymentioning

confidence: 99%

Fan-structure wind energy harvester using circular array of polyvinylidene fluoride cantilevers

Bai

Song

Dong

et al. 2016

Journal of Intelligent Material Systems and Structures

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“…where n 1 = L 3 linkage cos u sin uE The nonlinear model derived in equation ( 1) is capable of predicting the frame deformation, which was often ignored by some researchers (Li et al, 2011;Secord et al, 2010;Zhou and Zuo, 2013). The frame deformability is then coupled to the electromechanical modeling of the piezoelectric stack, as detailed in the following section for further analysis in energy output and frame improvement.…”

Section: Nonlinear Parametric Model Of the Force Amplification Ratiomentioning

confidence: 99%

“…In terms of force amplification frame, there are two commonly used mechanisms: the convex shape (Feenstra et al, 2008;Zhou and Zuo, 2013) and the concave shape (Secord et al, 2010). Often, flexures are used to soften the frame stiffness (Secord et al, 2010). In this article, deformable frames with flexure-freeconcave shape are used, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, force amplification ratio, k amp , is defined as the ratio between the output force applied by the frame, F out , and the input force applied to the frame, F in , as denoted in Figure 1(a). Some researchers (Li et al, 2011;Secord et al, 2010;Zhou and Zuo, 2013) modeled the force amplification ratio as a linear function in one unknown: cot(u), where u is the tilt angle of the linkage from the x-direction, illustrated in Figure 1 (b). This linear model is derived under the assumptions that all the frame components are rigid and the neighboring frame components are connected with hinges.…”

Section: Introductionmentioning

confidence: 99%

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Deformable force amplification frame promoting piezoelectric stack energy harvesting: Parametric model, experiments and energy analysis

Chen

Wang

Deng

2016

Journal of Intelligent Material Systems and Structures

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This article presents a nonlinear parametric model of force amplification ratio and an electromechanical model to couple the deformable frame with the piezoelectric stack in order to promote high-efficiency energy harvesting from human walking locomotion. Two improved frames (Frames I and II) are developed based on the modeling and simulation results. The experiments verified these modeling and simulation results that improved frames demonstrate a higher amplification ratio (8.4 for Frame II and 8.0 for Frame I), in comparison to the original frame (3.5). The experiments also verified these results that under the simulated walking excitation (100 N, ~1.4 Hz), the piezoelectric stack coupled with Frame II produces 4.1 mJ energy during each step, higher than the stand-alone stack (0.16 mJ) and the stack with the original frame (0.64 mJ). Note that the energy conversion efficiency of Frame II (9.1%) is even lower than that of Frame I (10.7%) and the stand-alone stack (25.8%). As such, this article concludes that the energy output of the piezoelectric stack depends largely on the frame deformations in terms of seven coupled frame parameters, instead of only one frame parameter (tilt angle), as commonly used in the referenced literature.

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“…However, since each linkage in these mechanisms is subject to a large compressive force due to its positive tilting angle, such type of mechanism is at high risk of local buckling. In order to resolve this problem, Secord et al (2010) and Liu et al (2014) developed a convex force amplification frame so that the stressed applied to the frame is tensile instead of compress. And thus, bulking is not a concern for such a convex design, however, the flexure hinges associated with their designs have produced high manufacturing complexity, and reduced the energy concerting efficiency due to increased potential energy loss (detailed in section ''Piezoelectric stacks with Frames I and II versus a stand-alone piezoelectric stack'').…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric stack energy harvesting with a force amplification frame: Modeling and experiment

Chen

Guzman

2016

Journal of Intelligent Material Systems and Structures

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This article presents the modeling and experimental validation of a piezoelectric stack energy harvester with a flexurefree convex force amplification frame to convert walking force into electricity. Compared to a stand-alone piezoelectric stack, experiments show an 8 times greater voltage output and a 112 times greater power output of such an energy harvester. A finite element method is used to provide a more accurate electromechanical model using Hamilton's principle and the piezoelectric constitutive equations. Simulation results from such a finite element method agree with the single-degreeof-freedom model. Experimental measurement shows the percentage errors of the output power are of 3.53% for the finite element method and 8.04% for the single-degree-of-freedom model of the piezoelectric stack energy harvester.

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A multi-cell piezoelectric device for tunable resonance actuation and energy harvesting

Cited by 5 publications

References 26 publications

Fan-structure wind energy harvester using circular array of polyvinylidene fluoride cantilevers

Fan-structure wind energy harvester using circular array of polyvinylidene fluoride cantilevers

Deformable force amplification frame promoting piezoelectric stack energy harvesting: Parametric model, experiments and energy analysis

Piezoelectric stack energy harvesting with a force amplification frame: Modeling and experiment

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