Radiation efficiency of submerged rectangular plates

Zhao, Chuanqi; Jun, Fan; Wang, Bin; Weilin, Tang

doi:10.1016/j.apacoust.2011.06.017

Cited by 20 publications

(5 citation statements)

References 15 publications

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“…Here, we loosely follow the derivation for sound transmission described by Liu et al [36]. However, Liu's derivation is for finite plates in air, and thus we account for fluid loading by utilizing results from Cheng et al as well as Lomas and Hayek [37,38]. Finally, we use the expression for radiation efficiency derived by Wallace in order to solve for sound transmission over the entire frequency spectrum [39].…”

Section: B Flexural Modes (Membrane Strategy)mentioning

confidence: 99%

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Design of Ceramic Packages for Acoustically Coupled Implantable Medical Devices

Shen

Maharbiz

2019

Preprint

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Objective: Ultrasonic acoustic power transfer is an efficient mechanism for coupling energy to millimeter and submillimeter implants in the body. To date, published ultrasonically powered implants have been encapsulated with thin film polymers that are susceptible to well-documented failure modes in vivo, including water penetration and attack by the body. As with all medical implants, packaging with ceramic or metallic materials can reduce water vapor transmission and improve biostability to provide decadal device lifetime.In this paper, we evaluate methods of coupling acoustic energy to the interior of ceramic packages. Methods: The classic wave approach and modal expansion are used to obtain analytical expressions for acoustic transmission through two different package designs and these approaches are validated experimentally. A candidate package design is demonstrated using alumina packages and titanium lids, designed to be acoustically transparent. Results: Bulk modes are shown to be more effective at coupling acoustic energy to a piezoelectric receiver than flexural modes. Using bulk modes, packaged motes have an overall link efficiency of roughly 10%, compared to 25% for unpackaged motes. Packaging does not have a significant effect on translational misalignment penalties, but does increase angular misalignment penalties. Passive amplitudemodulated backscatter communication is demonstrated. Conclusion: Thin lids enable the use of acoustically coupled devices even with package materials of very different acoustic impedance. Significance: This work provides an analysis and method for designing packages that enable acoustic coupling with implantable medical devices, which could facilitate clinical translation. Fig. 1. System overview for acoustically coupled implantable medical devices (IMDs) utilizing ultrasonic backscatter communication. Information from many different energy domains can be encoded in the amplitude of the backscatter (green/blue waves). For these devices to be clinically useful, packaging must be designed that both protects the devices and also allows for acoustic coupling.

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Section: B Flexural Modes (Membrane Strategy)mentioning

confidence: 99%

“…The effect of mutual coupling (i.e. ≠ ) has been shown to be negligible [37], so we will ignore mutualimpedance and only focus on self-impedance: = (16) Given that = . Plugging (16) into (14) and rearranging for yields:…”

Section: B Flexural Modes (Membrane Strategy)mentioning

confidence: 99%

Design of Ceramic Packages for Acoustically Coupled Implantable Medical Devices

Shen

Maharbiz

2019

Preprint

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“…Vibroacoustic responses of elastic structures surrounded by a heavy fluid, typically water, has been a major focus of the analysis of fluid-structure interactions, as studied in [1] and Refs therein. It is known that the surrounding fluid can significantly affect the response of a structure [2,3], and thus understanding the response of excited structures with various modelling techniques and experimentation is important.…”

Section: Introductionmentioning

confidence: 99%

An analytical approach for modelling the vibroacoustic behaviour of a heavy fluid-loaded plate near a free surface

Kha

Karimi

Maxit

et al. 2022

Journal of Sound and Vibration

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“…This approach is more reliable than conventional acoustic (i.e., microphone-based) methods, as, in the latter method, a diffuse acoustic field is assumed, which is not the case in the lower frequency range. Vibrometry also allows the determination of the radiation efficiency and sound reduction index with high spectral resolution [46], including the effect of the finiteness of the test object on the radiation efficiency and sound reduction index [47,48].…”

Section: Introductionmentioning

confidence: 99%

Vibrometry Assessment of the External Thermal Composite Insulation Systems Influence on the Façade Airborne Sound Insulation

Urbán

Roozen

Muellner³

et al. 2018

Applied Sciences

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This paper verifies the impact of the use of an external thermal composite system (ETICS) on airborne sound insulation. For optimum accuracy over a wide frequency range, classical microphone based transmission measurements are combined with accelerometer based vibrometry measurements. Consistency is found between structural resonance frequencies and bending wave velocity dispersion curves determined by vibrometry on the one hand and spectral features of the sound reduction index, the ETICS mass-spring-mass resonance induced dip in the acoustic insulation spectrum, and the coincidence induced dip on the other hand. Scanning vibrometry proves to be an effective tool for structural assessment in the design phase of ETICS systems. The measured spectra are obtained with high resolution in wide frequency range, and yield sound insulation values are not affected by the room acoustic features of the laboratory transmission rooms. The complementarity between the microphone and accelerometer based results allows assessing the effect of ETICS on the sound insulation spectrum in an extended frequency range from 20 Hz to 10 kHz. The modified engineering ∆R prediction model for frequency range up to coincidence frequency of external plaster layer is recommended. Values for the sound reduction index obtained by a modified prediction method are consistent with the measured data.

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Radiation efficiency of submerged rectangular plates

Cited by 20 publications

References 15 publications

Design of Ceramic Packages for Acoustically Coupled Implantable Medical Devices

Design of Ceramic Packages for Acoustically Coupled Implantable Medical Devices

An analytical approach for modelling the vibroacoustic behaviour of a heavy fluid-loaded plate near a free surface

Vibrometry Assessment of the External Thermal Composite Insulation Systems Influence on the Façade Airborne Sound Insulation

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