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Applied Computing Acoustics
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Applied Computing Acoustics

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Acoustics and Vibrations".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 6515

Special Issue Editors

Prof. Dr. Massimo Viscardi

E-Mail Website
Guest Editor
Department of Industrial Engineering, Aerospace Section University of Naples “Federico II”, 80125 Naples, Italy
Interests: acoustic; finite element method; structural dynamics; SHM; vibration analysis and testing
Special Issues, Collections and Topics in MDPI journals
Dr. Maurizio Arena

E-Mail Website
Guest Editor
Department of Industrial Engineering, Aerospace Section University of Naples “Federico II”, 80125 Naples, Italy
Interests: actuators; multifunctional materials; sensor technology; structural dynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The theme of acoustics is becoming increasingly crucial in the industrial sector. Often the vibroacoustic concerns have been solved through corrective actions in phases of the product life or already advanced product design. Following more and more stringent requirements in terms of low-emissivity or weight saving, the transport industry, in particular, has to deal with noise and vibration problems from the preliminary design stage. From this perspective, the development of effective tools for prediction is certainly a challenge that researchers must face. Obtaining accurate information on system response in design phases may drastically reduce both computational and experimental efforts. The purpose of this Special Issue is to collect innovative contributions from the whole technical-scientific community involved in the development and industrial application of predictive methods, advance measurement, and assessment methods, as well as optimization techniques and solutions to effectively face these vibroacoustic challenges. Therefore, manuscripts on the development of forecasting tools, innovative materials, passive and active control, and smart systems that can have a significant impact on industrial growth, are encouraged to be submitted.

Prof. Dr. Massimo Viscardi
Dr. Maurizio Arena
Guest Editors

Manuscript Submission Information

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Keywords

  • Computational Acoustic and Vibroacoustic
  • Active Control
  • Finite Element Methods
  • Fluid–Structure Interaction
  • Smart Materials
  • Vibration Absorbers
  • Measurement Techniques

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Published Papers (2 papers)

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Research

20 pages, 7705 KiB  
Article
A Dual Frequency Ultrasonic Cleaning Tank Developed by Transient Dynamic Analysis
by Worapol Tangsopa and Jatuporn Thongsri
Appl. Sci. 2021, 11(2), 699; https://doi.org/10.3390/app11020699 - 13 Jan 2021
Cited by 11 | Viewed by 3428
Abstract
At present, development of manufacturer’s ultrasonic cleaning tank (UCT) to match the requirements from consumers usually relies on computer simulation based on harmonic response analysis (HRA). However, this technique can only be used with single-frequency UCT. For dual frequency, the manufacturer used information [...] Read more.
At present, development of manufacturer’s ultrasonic cleaning tank (UCT) to match the requirements from consumers usually relies on computer simulation based on harmonic response analysis (HRA). However, this technique can only be used with single-frequency UCT. For dual frequency, the manufacturer used information from empirical experiment alongside trial-and-error methods to develop prototypes, resulting in the UCT that may not be fully efficient. Thus, lack of such a proper calculational method to develop the dual frequency UCT was a problem that greatly impacted the manufacturers and consumers. To resolve this problem, we proposed a new model of simulation using transient dynamics analysis (TDA) which was successfully applied to develop the prototype of dual frequency UCT, 400 W, 18 L in capacity, eight horn transducers, 28 and 40 kHz frequencies for manufacturing. The TDA can indicate the acoustic pressure at all positions inside the UCT in transient states from the start to the states ready for proper cleaning. The calculation also reveals the correlation between the positions of acoustic pressure and the placement positions of transducers and frequencies. In comparison with the HRA at 28 kHz UCT, this TDA yielded the results more accurately than the HRA simulation, comparing to the experiments. Furthermore, the TDA can also be applied to the multifrequency UCTs as well. In this article, the step-by-step development of methodology was reported. Finally, this simulation can lead to the successful design of the high-performance dual frequencies UCT for the manufacturers. Full article
(This article belongs to the Special Issue Applied Computing Acoustics)
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14 pages, 3791 KiB  
Article
Simulation Study on the Influence of Multifrequency Ultrasound on Transient Cavitation Threshold in Different Media
by Hu Dong, Xiao Zou and Shengyou Qian
Appl. Sci. 2020, 10(14), 4778; https://doi.org/10.3390/app10144778 - 11 Jul 2020
Cited by 4 | Viewed by 2371
Abstract
Through the introduction of multifrequency ultrasound technology, remarkable results have been achieved in tissue ablation and other aspects. By using the nonlinear dynamic equation of spherical bubble, the effects of the combination mode of multifrequency ultrasound, the peak negative pressure and its duration, [...] Read more.
Through the introduction of multifrequency ultrasound technology, remarkable results have been achieved in tissue ablation and other aspects. By using the nonlinear dynamic equation of spherical bubble, the effects of the combination mode of multifrequency ultrasound, the peak negative pressure and its duration, the phase angle difference, and the polytropic index on the transient cavitation threshold in four different media of water, blood, brain, and liver are simulated and analyzed. The simulation results show that under the same frequency difference and initial bubble radius, the transient cavitation threshold of the high-frequency, triple-frequency combination is higher than that of the low-frequency, triple-frequency combination. When the lowest frequency of triple frequencies is the same, the larger the frequency difference, the higher the transient cavitation threshold. When the initial bubble radius is small, the frequency difference has little effect on the transient cavitation threshold of the triple-frequency combination. With the increase of initial bubble radius, the influence of frequency difference on the transient cavitation threshold of the higher frequency combination of triple frequency is more obvious than that of the lower frequency combination of triple frequency. When the duration of peak negative pressure or peak negative pressure of the multifrequency combined ultrasound is longer than that of the single-frequency ultrasound, the transient cavitation threshold of the multifrequency combined ultrasound is lower than that of the single-frequency ultrasound; on the contrary, the transient cavitation threshold of the multifrequency combined ultrasound is higher than that of the single-frequency ultrasound. When the phase angle difference of multifrequency excitation is zero, the corresponding transient cavitation threshold is the lowest, while the change of the polytropic index has almost no effect on the transient cavitation threshold for the multifrequency combination. The research results can provide a reference for multifrequency ultrasound to reduce the transient cavitation threshold, which is of great significance for the practical application of cavitation. Full article
(This article belongs to the Special Issue Applied Computing Acoustics)
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