Resonance mode and sound pressure produced by circular diaphragms of electrostatic and piezoelectric speakers

Chiang, Hsin-Yuan; Huang, Yu-Hsi

doi:10.1016/j.apacoust.2017.08.020

Cited by 22 publications

(5 citation statements)

References 14 publications

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“…The piezoelectric galvanometer in this study uses film with isotropic stretching characteristics to minimize the effects of boundary tension on frequency. Under these conditions, numerical analysis can be used directly for the analysis of models under boundary-free conditions, because the small tension (∼40 N m −1 ) is neglected [29]. FEM results is similar to the previous study for piezoelectric disk under free boundary condition [30].…”

Section: Finite Element Analysissupporting

confidence: 76%

Development of a new piezoelectric galvanometer scanner: fabrication, operation, and measurements

Chiu

Lin

Yen

et al. 2021

Smart Mater. Struct.

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Our objective in this study was to overcome the size and complexity of existing galvanometers by developing a direct-drive galvanometer based on the deformation of a double-layer ceramic piezoelectric disc with mirrored surface. The resulting device is extremely compact (0.41 mm), light weight, and highly responsive. The performance of the galvanometer was evaluated using an electronic speckle interferometer to characterize vibration mode characteristics. The voltage and input frequency can be adjusted to match the vibration amplitude and vibration mode required for practical galvanometer operations. Using a position sensitive detector, we recorded changes in the position of a light spot generated by a single-point laser by which to track changes in the optical path imposed by the galvanometer. Experiments using graphics drawn by an open-loop control system verified the performance of the device.

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Section: Finite Element Analysissupporting

confidence: 76%

Development of a new piezoelectric galvanometer scanner: fabrication, operation, and measurements

Chiu

Lin

Yen

et al. 2021

Smart Mater. Struct.

Self Cite

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“…Despite their equal thickness (25 μm), the total SPL of the flat PI and three PIs with different micropatterns showed a difference of up to 15 dBA. It is determined that the above results shown by the change in the maximum displacement and resonant frequency change according to eqs –, and they are consistent with the change in thickness and mass reduction compared to the flat PI case. − We calculated the Eigen mode of different diaphragms with/without micropatterns by referring ,, to the method in which the maximum displacement is determined according to the Eigen mode and frequency of the thin actuator, and thus, the maximum sound pressure level is generated. Comparing Figure b–f and Table S-2, it can be confirmed that the natural frequency and the maximum displacement of the thin film according to mode 1 (0,1) are consistent with the actual experimental values.…”

Section: Resultsmentioning

confidence: 69%

“…Particularly, this system comprised multilayered membranes, and the end of the substrate was fixed. Thus, eq was modified into eq for accurate resonant frequency analysis and vibration mode analysis ,, f mn = β mn ′ π D N ρ total · t total …”

Section: Resultsmentioning

confidence: 99%

Vibroacoustic Characteristics of a Specific Patterned Polymer with Graphene for an Electrostatic Speaker

Lee

Seo

Kwon

et al. 2023

ACS Appl. Mater. Interfaces

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Graphene/polymer actuators were developed using bilayer graphene and various polymer substrates for use as transparent, flexible, and robust electrostatic speaker units. Additionally, a resonant frequency shift was induced using a polymer substrate on which various micropatterns were transferred to boost bass. The total sound pressure level (SPL) in the graphene/polymer actuator was measured by a sweep, and the frequency of the spectrum was confirmed to be one-third that of the octave band frequency. The change in the vibroacoustic characteristic with changes in Young's modulus and density was studied for the polymers of the same size and thickness. Particularly, the possibility of boosting bass was confirmed by inducing a resonant frequency shift and increasing the total SPL by adding micropatterns on a polymer substrate under the same conditions. The resonance frequency of 523 Hz and the SPL of 54 dBA in flat polymer film became 296 Hz and 69 dBA in a specific pattern, which produced a sound of >15 dB based on the same flat polymer. We expect that the design and information provided herein can provide the key parameters required to change the resonant frequency in small-size devices for the application of graphene/polymer thin-film actuators.

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“…It should be noted that the decrease of SPL amplitude at 90°and 270°is due to the clamping frame. The performance of ET as a loudspeaker is compared with reported loudspeakers in Table S1 (Sup-porting Information), [4,[33][34][35][47][48][49][50][51] showing an advantage in high sensitivity of sound generation and textile integration capability.…”

Section: Characteristics Of the Electrostatic Transducer For Acoustic...mentioning

confidence: 99%

Electrostatic Smart Textiles for Braille‐To‐Speech Translation

Li,

Liu,

et al. 2024

Advanced Materials

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Wearable Braille‐to‐speech translation system is of great importance for providing auditory feedback in assisting blind people and people with speech impairment. However, previous reported Braille‐to‐speech translation systems still need to be improved in terms of comfortability or integration. Here, we report a Braille‐to‐speech translation system that uses dual‐functional electrostatic transducers which are made of fabric‐based materials and can be integrated into textiles. Based on electrostatic induction, the electrostatic transducer can either serve as a tactile sensor or a loudspeaker with the same design. The proposed electrostatic transducers have excellent output performances, mechanical robustness, and working stability. By combining the devices with machine learning algorithms, it is possible to translate Braille alphabet and 40 commonly used words (extensible) into speech with an accuracy of 99.09% and 97.08%, respectively. This work demonstrates a new approach for further developments of advanced assistive technology towards improving the life of disabled people.This article is protected by copyright. All rights reserved

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Resonance mode and sound pressure produced by circular diaphragms of electrostatic and piezoelectric speakers

Cited by 22 publications

References 14 publications

Development of a new piezoelectric galvanometer scanner: fabrication, operation, and measurements

Development of a new piezoelectric galvanometer scanner: fabrication, operation, and measurements

Vibroacoustic Characteristics of a Specific Patterned Polymer with Graphene for an Electrostatic Speaker

Electrostatic Smart Textiles for Braille‐To‐Speech Translation

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