Broadening the Bandwidth of Piezoelectric Energy Harvesters Using Liquid Filled Mass

Jackson, Nathan; Stam, Frank; Olszewski, Zbigniew; Houlihan, Ruth; Mathewson, A.

doi:10.1016/j.proeng.2015.08.627

Cited by 21 publications

(15 citation statements)

References 9 publications

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“…For every new CoG, there is new natural frequency of the device. Similar, arrangement is reported in Jackson et al (2015), instead of cylinders, liquid is used as a medium that changes the CoG of PM. Furthermore, Jackson and Stam (2018) reported with increase in density of liquid bandwidth can be increased and less viscous liquid results into more sloshing effect enabling more CoG change.…”

Section: Introductionsupporting

confidence: 55%

“…The results show useful variation in device bandwidth when filled with liquid. Liquid properties such as density and viscosity of liquid play very important role when added in PM (Jackson et al 2015;Jackson and Stam 2018). For this study, in addition to water two other liquids were used for verifying bandwidth change.…”

Section: Effect Of Liquid Viscosity On Performance Of Standard Pm Devicementioning

confidence: 99%

“…Many structures are reported as wideband energy harvesters such as cantilever array (Chen et al 2015;Wen et al 2014;Liu et al 2008), magnetic tuning (Challa et al 2008;Zhu et al 2008Zhu et al , 2010, rolling masses (Somkuwar et al 2018;Chandwani et al 2019Chandwani et al , 2020, sliding mass (Miller et al 2013;Ahn et al 2018) and liquid-filled masses (Jackson et al 2015;Jackson and Stam 2018;Jackson 2020), are some of the methods used to tune the frequency of the system to the variable vibrating signal of the source.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we project the method to increase the bandwidth of PEH. Liquid filled devices showing prominent bandwidth increase have been reported (Jackson et al 2015;Jackson and Stam 2018). In addition to the moving mass, liquid has different dynamic properties compared to moving cylinders.…”

Section: Introductionmentioning

confidence: 99%

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Bandwidth widening of piezoelectric energy harvester by free moving cylinders in liquid medium

2020

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Ambient vibrations are one of the promising sources of energy harvesting to power up IoT and WSN nodes. Harvesting random vibrations requires the energy harvester to dynamically tune to the dominant vibration over large frequency band. The tuning is achieved with the help of auto/self-tunable, wideband or broadband energy harvesters. The reported cantilever based harvester is a wideband energy harvester which increases the bandwidth by immersing the moving mass in liquid medium. Splashing of liquid, viscous resistance offered to the moving mass, and the self weight of the liquid contributes to the improved performance over the moving mass based PEH reported earlier. Increased bandwidth is observed for system with two moving cylinders immersed in different liquids. Harvester's proof-mass height is another constraint used to observe the bandwidth change. Effect of viscosity of liquid, liquid filled percentage and amplitude of vibration are reported. The device with increased height of proof-mass and liquid filled for 50% volume shows 63.75% increase in bandwidth compared to the standard device without liquid.

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Section: Introductionsupporting

confidence: 55%

Section: Effect Of Liquid Viscosity On Performance Of Standard Pm Devicementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bandwidth widening of piezoelectric energy harvester by free moving cylinders in liquid medium

2020

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“…This dynamic tuning has the effect of widening the bandwidth. Previous attempts to create a sliding mass include using rolling cylinders [23][24][25][26], sloshing liquids [22,[27][28][29][30], and a combination of the two [31]. These wide bandwidth methods involve altering the resonant frequency during oscillation by changing the effective location of the proof mass.…”

Section: Introductionmentioning

confidence: 99%

Wide Bandwidth Vibration Energy Harvester with Embedded Transverse Movable Mass

Jackson

Rodríguez

Adhikari

2021

Sensors

Self Cite

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One of the biggest challenges associated with vibration energy harvesters is their limited bandwidth, which reduces their effectiveness when utilized for Internet of Things applications. This paper presents a novel method of increasing the bandwidth of a cantilever beam by using an embedded transverse out-of-plane movable mass, which continuously changes the resonant frequency due to mass change and non-linear dynamic impact forces. The concept was investigated through experimentation of a movable mass, in the form of a solid sphere, that was embedded within a stationary proof mass with hollow cylindrical chambers. As the cantilever oscillated, it caused the movable mass to move out-of-plane, thus effectively altering the overall effective mass of the system during operation. This concept combined high bandwidth non-linear dynamics from the movable mass with the high power linear dynamics from the stationary proof mass. This paper experimentally investigated the frequency and power effects of acceleration, the amount of movable mass, the density of the mass, and the size of the movable mass. The results demonstrated that the bandwidth can be significantly increased from 1.5 Hz to >40 Hz with a transverse movable mass, while maintaining high power output. Dense movable masses are better for high acceleration, low frequency applications, whereas lower density masses are better for low acceleration applications.

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Performance Testing of a Piezoelectric Device for Extracting Energy from Vibrations

Leonardi

Passacantilli

Galassi

et al. 2020

Lecture Notes in Electrical Engineering

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Broadening the Bandwidth of Piezoelectric Energy Harvesters Using Liquid Filled Mass

Cited by 21 publications

References 9 publications

Bandwidth widening of piezoelectric energy harvester by free moving cylinders in liquid medium

Bandwidth widening of piezoelectric energy harvester by free moving cylinders in liquid medium

Wide Bandwidth Vibration Energy Harvester with Embedded Transverse Movable Mass

Performance Testing of a Piezoelectric Device for Extracting Energy from Vibrations

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