Design and analysis of a small-scale magnetically levitated energy harvester utilizing oblique mechanical springs

Nammari, Abdullah; Doughty, Seth; Savage, Dustin; Weiss, Leland; Jaganathan, Arun P.; Bardaweel, Hamzeh

doi:10.1007/s00542-017-3324-x

Cited by 11 publications

(4 citation statements)

References 51 publications

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Section: Static Characterization Of a System With N Oblique Springsmentioning

confidence: 99%

“…The unique arrangement of the levitated magnet and the oblique springs, shown in Figure 1, produces desirable stiffness nonlinearities in the system (Nammari and Bardaweel, 2017; Nammari et al., 2017). In addition to the positive nonlinear stiffness introduced by the magnetic spring, the oblique mechanical springs produce geometric nonlinearity and negative stiffness (Nammari and Bardaweel, 2017; Nammari et al., 2017). For static condition, that is, y = 0, the force of a single oblique mechanical spring along its axis is given by and the total oblique mechanical springs’ forces in vertical direction is given by where sinψ=χχ2+a2.…”

Section: Static Characterization Of a System With N Oblique Springsmentioning

confidence: 99%

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Displacement transmissibility evaluation of vibration isolation system employing nonlinear-damping and nonlinear-stiffness elements

Mofidian

Bardaweel

2017

Journal of Vibration and Control

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Undesired oscillations commonly encountered in engineering practice can be harmful to structures and machinery. Vibration isolation systems are used to attenuate undesired oscillations. Recently, there has been growing interest in nonlinear approaches towards vibration isolation systems design. This work is focused on investigating the effect of nonlinear cubic viscous damping in a vibration isolation system consisting of a magnetic spring with a positive nonlinear stiffness, and a mechanical oblique spring with geometric nonlinear negative stiffness. Dynamic model of the vibration isolation system is obtained and the harmonic balance method (HBM) is used to solve the governing dynamic equation. Additionally, fourth order Runge–Kutta numerical simulation is used to obtain displacement transmissibility of the system under investigation. Results obtained from numerical simulation are in good agreement with those obtained using HBM. Results show that introducing nonlinear damping improves the performance of the vibration isolation system. Nonlinear damping purposefully introduced into the described vibration isolation system appears to eliminate undesired frequency jump phenomena traditionally encountered in quasi-zero-stiffness vibration isolation systems. Compared to its rival linear vibration isolation system, the described nonlinear system transmits less vibrations around resonant peak. At lower frequencies, both nonlinear and linear isolation systems show comparable transmissibility characteristics.

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Section: Static Characterization Of a System With N Oblique Springsmentioning

confidence: 99%

Section: Static Characterization Of a System With N Oblique Springsmentioning

confidence: 99%

Displacement transmissibility evaluation of vibration isolation system employing nonlinear-damping and nonlinear-stiffness elements

Mofidian

Bardaweel

2017

Journal of Vibration and Control

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“…Lately, there has been growing interest in developing dual function systems that are capable of both vibration isolation and energy harvesting (Ali and Adhikari, 2013;Chen et al, 2014;Davis and McDowell, 2017;Gonzalez-Buelga et al, 2014;Hu et al, 2017;Kwon and Oh, 2016;Li et al, 2017;Mofidian and Bardaweel, 2019;Shen et al, 2018b;Tang and Zuo, 2012;Yuan et al, 2018). This interest is driven by the continuous improvement in electronics manufacturing which led to deployment of onboard low-power sensors and gadgets (Knight et al, 2008;Nammari et al, 2017Nammari et al, , 2018Patel et al, 2012;Seah et al, 2009). For instance, onboard sensing units are currently installed on equipment and structures, such as highway bridges and moving vehicles, to monitor their health conditions including temperature, pressure, stress, strain, and humidity (Park et al, 2008;Priya and Inman, 2009;Sazonov et al, 2009;Seah et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimal design of a vibration isolation system combined with electromagnetic energy harvester

Diala

Mofidian

Lang

et al. 2019

Journal of Intelligent Material Systems and Structures

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This work investigates a vibration isolation energy harvesting system and studies its design to achieve an optimal performance. The system uses a combination of elastic and magnetic components to facilitate its dual functionality. A prototype of the vibration isolation energy harvesting device is fabricated and examined experimentally. A mathematical model is developed using first principle and analyzed using the output frequency response function method. Results from model analysis show an excellent agreement with experiment. Since any vibration isolation energy harvesting system is required to perform two functions simultaneously, optimization of the system is carried out to maximize energy conversion efficiency without jeopardizing the system’s vibration isolation performance. To the knowledge of the authors, this work is the first effort to tackle the issue of simultaneous vibration isolation energy harvesting using an analytical approach. Explicit analytical relationships describing the vibration isolation energy harvesting system transmissibility and energy conversion efficiency are developed. Results exhibit a maximum attainable energy conversion efficiency in the order of 1%. Results suggest that for low acceleration levels, lower damping values are favorable and yield higher conversion efficiencies and improved vibration isolation characteristics. At higher acceleration, there is a trade-off where lower damping values worsen vibration isolation but yield higher conversion efficiencies.

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“…A piezoelectric vibration energy harvester is more suitable for high frequency, small amplitude vibration energy which has high power density. An electromagnetic vibration harvester is more suitable for low frequency, large amplitude vibration energy which has relatively low power density [10,11].…”

Section: Introductionmentioning

confidence: 99%

A Dimensionless Parameter Analysis of a Cylindrical Tube Electromagnetic Vibration Energy Harvester and Its Oscillator Nonlinearity Effect

et al. 2018

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This paper investigates a single degree of freedom oscillator in a cylindrical tube vibration energy harvester which is applicable in a low-frequency range. A duffing-type nonlinear dynamic differential equation of the oscillator was developed for the nonlinear analysis and solved by using the harmonic balance method in order to widen energy harvesting frequency bandwidth. The exploitation of nonlinear spring force interactions of the oscillator to enhance the generator's performance is also presented in this paper. The dimensionless harvested power formula of the nonlinear mass-spring-damper system was derived, and a parameter study was conducted for the design optimization of the harvester. The main contribution of this paper is to establish a dimensionless performance analysis method of a nonlinear electromagnetic vibration energy harvester system and to disclose the effects of the parameters and nonlinearity of the system on the harvesting performance.

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Design and analysis of a small-scale magnetically levitated energy harvester utilizing oblique mechanical springs

Cited by 11 publications

References 51 publications

Displacement transmissibility evaluation of vibration isolation system employing nonlinear-damping and nonlinear-stiffness elements

Displacement transmissibility evaluation of vibration isolation system employing nonlinear-damping and nonlinear-stiffness elements

Analysis and optimal design of a vibration isolation system combined with electromagnetic energy harvester

A Dimensionless Parameter Analysis of a Cylindrical Tube Electromagnetic Vibration Energy Harvester and Its Oscillator Nonlinearity Effect

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