Acoustic characteristics of underwater cylindrical Helmholtz resonator

Wang, Zefeng; Yong-ming, HU; Zhou, Meng; Ni, Ming

doi:10.7498/aps.57.7022

Cited by 12 publications

(5 citation statements)

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“…However, proper use and distribution of masks help to prevent respiratory infectious disease [6]. Many individuals around the world use masks which are produced from non-degradable petrochemical materials and without proper disposal it can cause environmental damage and the toxic chemicals in it can transmit through the air which finally is inhaled by the people around likewise it leads to the increase in the spread of the virus [7]. Researchers are currently focusing on the reusable cloth masks that are completely bio-based and effective being low cost, disposable, and user friendly since there is an extreme shortage of surgical masks and infection protective equipment around the world and there is a death of N95/FFP2 masks in numerous countries during the ongoing pandemic and the prices are rising constantly by the online retailers like Amazon, Flipkart.…”

Section: Ecs Transactions 107 (1) 1475-1486 (2022)mentioning

confidence: 99%

An Overview of the Artificial Neural Network-Based Applications and Impact Assessment in COVID-19

Nagaraja¹,

Pothina²,

Devi³

et al. 2022

ECS Trans.

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The article is regarding infectious disease, which has been affecting people all around the world since December 2019. Write-up gives a brief introduction of the Coronavirus from its emergence to the final solution of its exit. It gives us a glimpse of the biological structure of the virus, precautions to be taken in care to reduce the spread of the disease. The description shows us the consequences of the virus-like the mortality rate and the life expectancy rate. The article also presents a few vaccines development projects as a whole to fight COVID-19. It also describes the efficacy of vaccination and the post-vaccination symptoms. In the end, the write-up presents real-time neural network-based applications to fight COVID-19 and a few machine learning and deep learning techniques to diagnose a COVID-19 infected person. The final part of the article concludes with an artificial neural network and statistical neural network-based approaches to identify the rate of infection risk in a country.

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Section: Ecs Transactions 107 (1) 1475-1486 (2022)mentioning

confidence: 99%

An Overview of the Artificial Neural Network-Based Applications and Impact Assessment in COVID-19

Nagaraja¹,

Pothina²,

Devi³

et al. 2022

ECS Trans.

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“…This indicates that the mutual radiation between the two radiation surfaces of the bender does not play a leading role in the calculation frequency band when the bender is in the center of the baffle. C of the radiation impedance branch of the bender paralleled by the transformer [28,29]. Then, a resonant branch which provides the possibility for the transducer to realize multimode coupling is introduced to the circuit when the two resonant frequencies are relatively close.…”

Section: Vibration and Radiation Characteristicsmentioning

confidence: 99%

“…The variation of the radiation impedance of the bender after the introduction of the baffle can be expressed by the difference between the piston end impedance of the piston driver in the open-ended unflanged pipe driven by a planar piston [27] and the radiation impedance of the bender itself shown in Equation ( 1), where r b , S b are the radius and cross-sectional area of the baffle, respectively; r, S are the radius and area of the radiating surface of the bender, respectively; and the mutual radiation effect between the bender and the baffle is feasibly equivalent to the mutual radiation resistance ∆R r and the mutual radiation mass reactance ∆X r , which are combined equivalently with the radiation impedance of the bender itself in the acoustic end. The effectiveness of the baffle and the liquid cavity is equivalent to the acoustic resistance R a , the acoustic mass M a and M b , and the acoustic compliance C a and C b of the radiation impedance branch of the bender paralleled by the transformer [28,29]. Then, a resonant branch which provides the possibility for the transducer to realize multimode coupling is introduced to the circuit when the two resonant frequencies are relatively close.…”

Section: Vibration and Radiation Characteristicsmentioning

confidence: 99%

Design of a Broadband Cavity Baffle Bender Transducer

Zhang

et al. 2022

JMSE

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As low-frequency and broadband acoustic emission capability is beneficial to the detection range and acoustic communication speed of small scale autonomous underwater vehicles (AUV), this type of transducer is required, especially in cases of complex acoustic environments. A broadband bender transducer with cavity baffle that suits small scale AUV is proposed. Rather than additional benders, a passive cavity baffle, which would be capable of providing mutual radiation and a fluid cavity mode, is introduced to a single bender. The bending resonant frequency is reduced by the mutual radiation between the bender and the cavity baffle, the cavity baffle extends the lower limit of the available frequency band of the transducer, the liquid resonant frequency behind the former expands the higher limit, then the cavity baffle bender transducer fills the role of radiating low-frequency and broadband emissions through multimode coupling. The finite element method is used to analyze the acoustic performance of the transducer under different baffle conditions. Then, a prototype of the broadband cavity baffle bender transducer is developed according to the optimized parameters of simulation. The acoustic parameters of the prototype were measured in an anechoic pool. The resonant frequency measured in water of the bender itself is 3 kHz, and the −3dB bandwidth is 560 Hz. The prototype test results show that the cavity baffle scheme can improve the −3dB bandwidth of the bender from 560 Hz to 1000 Hz, which fundamentally realizes the expectations of the prototype design.

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“…where V a is the volume of the cavity, ρ 0 is the density of water. At low frequency, Z AD can be written as [16]…”

Section: Theorymentioning

confidence: 99%

Investigation on a pressure-gradient fiber laser hydrophone

Zhang¹,

Zhang²,

Li³

et al. 2010

Meas. Sci. Technol.

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In this paper, a pressure-gradient fiber laser hydrophone is demonstrated. Two brass diaphragms are installed at the end of a metal cylinder as sensing elements. A distributed feedback fiber laser, fixed at the center of the two diaphragms, is elongated or shortened due to the acoustic wave. There are two orifices at the middle of the cylinder. So this structure can work as a pressure-gradient microphone in the acoustic field. Furthermore, the hydrostatic pressure is self-compensated and an ultra-thin dimension is achieved. Theoretical analysis is given based on the electro-acoustic theory. Field trials are carried out to test the performance of the hydrophone. A sensitivity of 100 nm MPa −1 has been achieved. Due to the small dimensions, no directivity is found in the test.

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Acoustic characteristics of underwater cylindrical Helmholtz resonator

Cited by 12 publications

References 0 publications

An Overview of the Artificial Neural Network-Based Applications and Impact Assessment in COVID-19

An Overview of the Artificial Neural Network-Based Applications and Impact Assessment in COVID-19

Design of a Broadband Cavity Baffle Bender Transducer

Investigation on a pressure-gradient fiber laser hydrophone

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