Improved Acoustic Energy Harvester Using Tapered Neck Helmholtz Resonator and Piezoelectric Cantilever Undergoing Concurrent Bending and Twisting

Pillai, Minu A.; Ezhilarasi, D.

doi:10.1016/j.proeng.2016.05.065

Cited by 17 publications

(15 citation statements)

References 7 publications

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“…We hypothesize that the multiple side appendages turn the swim bladder into a high-pass filter that will function as a Helmholz absorber 66 , 67 , a concept unexplored in fish bioacoustics. Tang 66 notes Helmholtz resonators are widely used as silencing devices in ducted systems because of their strong sound attenuation and have been useful in dealing with the low-frequency noise propagating inside air conditioning ductworks.…”

Section: Discussionmentioning

confidence: 99%

A sciaenid swim bladder with long skinny fingers produces sound with an unusual frequency spectrum

Mok

Sirisuary

et al. 2020

Sci Rep

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Swim bladders in sciaenid fishes function in hearing in some and sound production in almost all species. Sciaenid swim bladders vary from simple carrot-shaped to two-chambered to possessing various diverticula. Diverticula that terminate close to the ears improve hearing. Other unusual diverticula heading in a caudal direction have not been studied. The fresh-water Asian species Boesemania microlepis has an unusual swim bladder with a slightly restricted anterior region and 6 long-slender caudally-directed diverticula bilaterally. We hypothesized that these diverticula modify sound spectra. Evening advertisement calls consist of a series of multicycle tonal pulses, but the fundamental frequency and first several harmonics are missing or attenuated, and peak frequencies are high, varying between < 1–2 kHz. The fundamental frequency is reflected in the pulse repetition rate and in ripples on the frequency spectrum but not in the number of cycles within a pulse. We suggest that diverticula function as Helmholz absorbers turning the swim bladder into a high-pass filter responsible for the absence of low frequencies typically present in sciaenid calls. Further, we hypothesize that the multicycle pulses are driven by the stretched aponeuroses (flat tendons that connect the sonic muscles to the swim bladder) in this and other sciaenids.

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Section: Discussionmentioning

confidence: 99%

A sciaenid swim bladder with long skinny fingers produces sound with an unusual frequency spectrum

Mok

Sirisuary

et al. 2020

Sci Rep

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“…The acoustic energy collector based on PVDF piezoelectric film as piezoelectric material has the characteristics of small structure size and low resonance frequency. For example, Pillai et al designed a sound energy collector with a tapered neck [29]. A flexible triangular sheet is provided in the collector, and the triangular sheet is connected with the free end of the flexible PVDF cantilever beam.…”

Section: Analysis Of Research Status Of Flutter-type Harvesting Devicementioning

confidence: 99%

Research progress of cavity-based acoustic energy harvester

Li¹,

Chen²,

Zou³

et al. 2021

J. vibroeng.

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The acoustic energy collector uses the cavity acoustic mode to capture the acoustic signal in a certain frequency range at the mouth of the cavity, achieves fluid-solid coupling and amplifies the acoustic vibration excitation, and then through piezoelectric, magnetoelectric and friction power generation mechanisms, the acoustic energy is finally converted into electrical energy. The overview of the research progress of cavity-based acoustic energy harvesters has found that acoustic energy harvesters are usually composed of resonant cavity, diaphragm, and transducer materials, and the resonant cavity is the key to the design of acoustic energy harvester. Analyze the influence of cavity structure on sound pressure amplification to provide reference for the research and application of acoustic energy harvester. The piezoelectric type is the main energy conversion method, the magnetoelectric type is the auxiliary, and the friction power generation and the acoustic crystal resonance power generation have also become a new research direction, because of the widest application range of hybrid power generation, it has become a future development trend.

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“…Through the test, the tapered Helmholtz resonator can better amplify the sound pressure under the same conditions, the voltage obtained is increased by 33.33%, and the output power is increased by 76.26%. Pillai et al designed a Helmholtz resonator with a tapered neck structure [ 19 ], and experimentally verified that the tapered neck can increase the sound pressure magnification and help the sound energy harvester output a higher voltage.…”

Section: Introductionmentioning

confidence: 99%

Sensitive Parameters of Dynamic Excitation on Fuze Airflow-Induced Acoustic Generator

Chen

2021

Micromachines

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This paper aims at the power generation requirements of the fuze airflow-induced acoustic generator, analyzes the influence of structural parameters on the fluid power sound source, which is related to the power generation performance and use performance of the generator. In this paper, the orthogonal experiment method is used to study the sensitive parameters that control fluid dynamic sound sources. The results show that the annulus, the confronting distance, and cavity length can all have an impact on the sound pressure amplitude, and the sound pressure amplitude is most sensitive to the change of the confronting distance. However, the length of the resonant cavity has the most significant effect on the sound pressure frequency. The size of the annulus has a weak effect on the sound pressure frequency, and the confronting distance has almost no effect on the sound pressure frequency. The optimal combination scheme with the highest output power is selected according to the sensitive parameters. In addition, the empirical formula for the vibration frequency of the airflow-induced acoustic generator in the short resonant cavity was revised, and the influence of the annular gap on the vibration frequency was added, and the influence factor α = 0.3 was determined. The corrected frequency empirical formula has the smallest error between the theoretical value and the experimental value, and can be used as an effective method for estimating the vibration frequency. This provides a reference for the engineering design of the fuze airflow-induced acoustic generator, which has high military value and application prospects.

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Improved Acoustic Energy Harvester Using Tapered Neck Helmholtz Resonator and Piezoelectric Cantilever Undergoing Concurrent Bending and Twisting

Cited by 17 publications

References 7 publications

A sciaenid swim bladder with long skinny fingers produces sound with an unusual frequency spectrum

A sciaenid swim bladder with long skinny fingers produces sound with an unusual frequency spectrum

Research progress of cavity-based acoustic energy harvester

Sensitive Parameters of Dynamic Excitation on Fuze Airflow-Induced Acoustic Generator

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