Planform geometry effects of piezoelectric wind energy harvesting composite inverted flags

Kaidong Yang; Mostafa R.A. Nabawy; Andrea Cioncolini; Alistair Revell; Saad AlGhrairy

doi:10.1088/1361-665X/ac2b8a

Planform geometry effects of piezoelectric wind energy harvesting composite inverted flags

Kaidong Yang, Mostafa R.A. Nabawy, Andrea Cioncolini^*, Alistair Revell, Saad AlGhrairy

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Energy harvesting devices based on the inverted flag configuration have recently attracted attention as a viable option to power small electronics and remote wireless sensors from wind excitation. Despite showing high potential, relatively little research has considered how the dynamics and power generation performance of these devices vary with planform geometry. This study considers composite inverted flags constructed using flexible polyvinylidene difluoride strips as active elements sandwiching a stainless-steel shim as elastic structural support, a configuration allowing for enhanced ability to tailor mechanical and geometrical properties (and hence responses) of the flag. We explore the effect of three key parameters (planform aspect ratio, mass ratio, second moment of area) on flag dynamics (amplitude, flapping frequency) and operational characteristics (power, velocity range). Twelve flags have been manufactured and tested under controlled wind excitation, selected to cover aspect ratios in the range of 0.9-7 and mass ratios in the range of 7-14. Our results expose a number of useful insights into how these devices perform. First, we show that for a given mass ratio, flapping amplitude, frequency, power, and power density are all inversely proportional to aspect ratio and proportional to second moment of planform area. Second, we show that second moment of planform area is a better indicator parameter to assess the flags performance, as compared to the aspect ratio. Third, we show that as mass ratio increases higher power densities and wider operational velocity ranges are allowed; however, this is on the expense of the flag being more sensitive to variations in operating conditions and the possibility of experiencing some unfavourable motion behaviour such as the 'one-sided' low-amplitude high-frequency low-power flapping mode.

Original language	English
Article number	115014
Journal	Smart Materials and Structures
Volume	30
Issue number	11
DOIs	https://doi.org/10.1088/1361-665X/ac2b8a
State	Published - Nov 2021
Externally published	Yes

Keywords

Energy harvesting
Experiment
Inverted flag
PVDF
Piezoelectric
Wind

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10.1088/1361-665X/ac2b8a

Cite this

@article{8e317d38833a45cd823588ddfeadbc29,

title = "Planform geometry effects of piezoelectric wind energy harvesting composite inverted flags",

abstract = "Energy harvesting devices based on the inverted flag configuration have recently attracted attention as a viable option to power small electronics and remote wireless sensors from wind excitation. Despite showing high potential, relatively little research has considered how the dynamics and power generation performance of these devices vary with planform geometry. This study considers composite inverted flags constructed using flexible polyvinylidene difluoride strips as active elements sandwiching a stainless-steel shim as elastic structural support, a configuration allowing for enhanced ability to tailor mechanical and geometrical properties (and hence responses) of the flag. We explore the effect of three key parameters (planform aspect ratio, mass ratio, second moment of area) on flag dynamics (amplitude, flapping frequency) and operational characteristics (power, velocity range). Twelve flags have been manufactured and tested under controlled wind excitation, selected to cover aspect ratios in the range of 0.9-7 and mass ratios in the range of 7-14. Our results expose a number of useful insights into how these devices perform. First, we show that for a given mass ratio, flapping amplitude, frequency, power, and power density are all inversely proportional to aspect ratio and proportional to second moment of planform area. Second, we show that second moment of planform area is a better indicator parameter to assess the flags performance, as compared to the aspect ratio. Third, we show that as mass ratio increases higher power densities and wider operational velocity ranges are allowed; however, this is on the expense of the flag being more sensitive to variations in operating conditions and the possibility of experiencing some unfavourable motion behaviour such as the 'one-sided' low-amplitude high-frequency low-power flapping mode.",

keywords = "Energy harvesting, Experiment, Inverted flag, PVDF, Piezoelectric, Wind",

author = "Kaidong Yang and Nabawy, {Mostafa R.A.} and Andrea Cioncolini and Alistair Revell and Saad AlGhrairy",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s). Published by IOP Publishing Ltd Printed in the UK",

year = "2021",

month = nov,

doi = "10.1088/1361-665X/ac2b8a",

language = "英语",

volume = "30",

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T1 - Planform geometry effects of piezoelectric wind energy harvesting composite inverted flags

AU - Yang, Kaidong

AU - Nabawy, Mostafa R.A.

AU - Cioncolini, Andrea

AU - Revell, Alistair

AU - AlGhrairy, Saad

PY - 2021/11

Y1 - 2021/11

N2 - Energy harvesting devices based on the inverted flag configuration have recently attracted attention as a viable option to power small electronics and remote wireless sensors from wind excitation. Despite showing high potential, relatively little research has considered how the dynamics and power generation performance of these devices vary with planform geometry. This study considers composite inverted flags constructed using flexible polyvinylidene difluoride strips as active elements sandwiching a stainless-steel shim as elastic structural support, a configuration allowing for enhanced ability to tailor mechanical and geometrical properties (and hence responses) of the flag. We explore the effect of three key parameters (planform aspect ratio, mass ratio, second moment of area) on flag dynamics (amplitude, flapping frequency) and operational characteristics (power, velocity range). Twelve flags have been manufactured and tested under controlled wind excitation, selected to cover aspect ratios in the range of 0.9-7 and mass ratios in the range of 7-14. Our results expose a number of useful insights into how these devices perform. First, we show that for a given mass ratio, flapping amplitude, frequency, power, and power density are all inversely proportional to aspect ratio and proportional to second moment of planform area. Second, we show that second moment of planform area is a better indicator parameter to assess the flags performance, as compared to the aspect ratio. Third, we show that as mass ratio increases higher power densities and wider operational velocity ranges are allowed; however, this is on the expense of the flag being more sensitive to variations in operating conditions and the possibility of experiencing some unfavourable motion behaviour such as the 'one-sided' low-amplitude high-frequency low-power flapping mode.

AB - Energy harvesting devices based on the inverted flag configuration have recently attracted attention as a viable option to power small electronics and remote wireless sensors from wind excitation. Despite showing high potential, relatively little research has considered how the dynamics and power generation performance of these devices vary with planform geometry. This study considers composite inverted flags constructed using flexible polyvinylidene difluoride strips as active elements sandwiching a stainless-steel shim as elastic structural support, a configuration allowing for enhanced ability to tailor mechanical and geometrical properties (and hence responses) of the flag. We explore the effect of three key parameters (planform aspect ratio, mass ratio, second moment of area) on flag dynamics (amplitude, flapping frequency) and operational characteristics (power, velocity range). Twelve flags have been manufactured and tested under controlled wind excitation, selected to cover aspect ratios in the range of 0.9-7 and mass ratios in the range of 7-14. Our results expose a number of useful insights into how these devices perform. First, we show that for a given mass ratio, flapping amplitude, frequency, power, and power density are all inversely proportional to aspect ratio and proportional to second moment of planform area. Second, we show that second moment of planform area is a better indicator parameter to assess the flags performance, as compared to the aspect ratio. Third, we show that as mass ratio increases higher power densities and wider operational velocity ranges are allowed; however, this is on the expense of the flag being more sensitive to variations in operating conditions and the possibility of experiencing some unfavourable motion behaviour such as the 'one-sided' low-amplitude high-frequency low-power flapping mode.

KW - Energy harvesting

KW - Experiment

KW - Inverted flag

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KW - Piezoelectric

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ER -

Planform geometry effects of piezoelectric wind energy harvesting composite inverted flags

Abstract

Keywords

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