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Applied Sciences
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Noise Reduction and Vibration Isolation
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Noise Reduction and Vibration Isolation

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

Deadline for manuscript submissions: closed (25 May 2022) | Viewed by 13512

Special Issue Editor

Prof. Dr. Gil Ho Yoon

E-Mail Website
Guest Editor
Department of Mechanical & Industrial Engineering, Hanyang University, Seoul 04763, Korea
Interests: noise reduction and vibration isolation; resonator; metamaterial; acoustic metamaterial; optimization; structural and multidisciplinary optimization; topology optimization; fluid–structure interaction

Special Issue Information

Dear Colleagues,

Many circumstances ranging from individual life to industrial machinery and beyond are subjected to noise and vibration phenomena. In terms of acoustics and vibrations, it is necessary to design and develop a system that is as efficient as possible in order to avoid health problems, noise, and damage. Therefore, the development of new knowledge is required to reduce noise and vibration from many engineering fields. This Special Issue is proposed to contribute to solving these important engineering issues, broaden our knowledge, and disseminate some new findings. We hope to collect original research and review articles describing theoretical findings as well as experimental results related to noise reduction and vibration isolation. This Special Issue will share the latest results on the theories, characterization, and applications in noise and vibration. Researchers are very welcome to submit their most interesting perspectives, reviews, and original works providing novel insights regarding this multidisciplinary science research field.

Prof. Dr. Gil Ho Yoon
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • noise reduction and vibration isolation
  • resonator
  • metamaterial
  • acoustic metamaterial
  • optimization
  • structural and multidisciplinary optimization

Published Papers (7 papers)

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Research

15 pages, 6593 KiB  
Article
Research into Possibilities of Reducing Noise Emissions in the Sandy Gravel Production Process—Case Study
by Gabriela Bogdanovská, Vieroslav Molnár, Gabriel Fedorko and Dagmar Bednárová
Appl. Sci. 2022, 12(9), 4398; https://doi.org/10.3390/app12094398 - 27 Apr 2022
Viewed by 1465
Abstract
The continuous process industry is an important area of the economy. In addition to its undeniable societal benefits, its operation is associated with several factors that are often perceived negatively and have an adverse impact on the environment, noise emissions being one of [...] Read more.
The continuous process industry is an important area of the economy. In addition to its undeniable societal benefits, its operation is associated with several factors that are often perceived negatively and have an adverse impact on the environment, noise emissions being one of them. Accordingly, noise emissions have been the subject of numerous studies and always have to be approached in the context of a specific industrial area. In this paper, a case study is presented to illustrate the results of research aimed at reducing noise emissions in the sandy gravel production process. The research identified causes and effects of noise emissions arising from the gravel treatment process. Based on these, practical solutions were subsequently investigated and proposed, and their implementation brought noise emissions below 50 dB. The results obtained during the research can be generalized for further study of the issue and can be used to make general valid recommendations applicable in the continuous process industry. Full article
(This article belongs to the Special Issue Noise Reduction and Vibration Isolation)
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16 pages, 5437 KiB  
Article
Design and Experiment of Magnetic Antenna Vibration and Noise Reduction System
by Sijie Jiang, Changgeng Shuai, Wei Jiang, Linmin Huang, Huan Zheng and Chengren Yuan
Appl. Sci. 2022, 12(5), 2450; https://doi.org/10.3390/app12052450 - 26 Feb 2022
Cited by 2 | Viewed by 1402
Abstract
The magnetic antenna can receive extremely weak underwater magnetic signals, and induce the magnetic field intensity which can reach the femto-tesla (fT) level, making it widely used in underwater electromagnetic signal detection. However, even the slightest vibration in the environment transmitted to the [...] Read more.
The magnetic antenna can receive extremely weak underwater magnetic signals, and induce the magnetic field intensity which can reach the femto-tesla (fT) level, making it widely used in underwater electromagnetic signal detection. However, even the slightest vibration in the environment transmitted to the antenna will make it cut the geomagnetic field movement; as a result, electromagnetic-induced noise would be generated, and affect the performance of the magnetic antenna. The best method to suppress the motion induced noise is to isolate the magnetic antenna effectively from the ambient vibration. In this paper, the vibration reduction requirements of magnetic antenna are identified, and the principle of vibration absorber system of the magnetic antenna model is established. A magnetic antenna damping system, mainly focusing on low frequency, is proposed by using a silicon rubber elastic element. Based on the proposed method, a magnetic antenna damping system with an attenuation rate up to 100 times is designed, and some performance experiments are scheduled. The experiment results show that the performance of the magnetic antenna damping system meets the design requirements. Full article
(This article belongs to the Special Issue Noise Reduction and Vibration Isolation)
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12 pages, 2102 KiB  
Article
Sharp and Rounded Cutouts in a Chevron Orifice and Them Impact on the Acoustic and Flow Parameters of Synthetic Jet
by Emil Smyk
Appl. Sci. 2021, 11(20), 9624; https://doi.org/10.3390/app11209624 - 15 Oct 2021
Cited by 1 | Viewed by 1097
Abstract
The application of a synthetic jet actuator in workplaces entails the necessity of noise reduction, which they generate. One of the methods to achieve this is the use of the chevron orifice or nozzle. Therefore, the impact of different numbers of chevrons and [...] Read more.
The application of a synthetic jet actuator in workplaces entails the necessity of noise reduction, which they generate. One of the methods to achieve this is the use of the chevron orifice or nozzle. Therefore, the impact of different numbers of chevrons and rounding of cutouts in the orifice on the actuator efficiency and the sound pressure level was tested. The chevron orifices were compared to the circular orifice. The time-mean reaction force method was used to measured efficiency and flow parameters, and the noise was measured according to the ISO 3746:2010. The rounded cutouts had an advantageous impact on the actuator efficiency at the power P>1 W, while the efficiency of the actuator with classic chevron orifice was smaller than with circular orifice. The noise generated by the actuator with the chevron orifice was smaller from 0.6 to 1.6 dB than by the actuator with the circular orifice, at the number of chevrons equal to 7 or more. The rounding of cutouts in the chevron orifice can advantageously impact the parameters of synthetic jet actuators. Full article
(This article belongs to the Special Issue Noise Reduction and Vibration Isolation)
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20 pages, 10983 KiB  
Article
A Study of Longitudinal Waveguide with Band Gap Using Cylindrical and Conical Shape Periodic Structure
by Dong Hyeon Oh and Gil Ho Yoon
Appl. Sci. 2021, 11(16), 7257; https://doi.org/10.3390/app11167257 - 06 Aug 2021
Cited by 1 | Viewed by 1335
Abstract
This research presents the theoretical and experimental studies for cylindrical and conical periodic structures to control longitudinal wave motion. Many relevant researches exist to stop and pass a certain frequency wave without active devices with periodic structures called metamaterials. To modify or control [...] Read more.
This research presents the theoretical and experimental studies for cylindrical and conical periodic structures to control longitudinal wave motion. Many relevant researches exist to stop and pass a certain frequency wave without active devices with periodic structures called metamaterials. To modify or control longitudinal wave propagation, i.e., passing or blocking mechanical wave within specific frequency ranges, repeated mass-spring systems or metamaterials can be applied. By integrating a few identical structural components to form a whole structure, it is possible to make a mechanical filter for wave propagation. Most studies rely on straight bar with cylindrical structure. Thus, with a unit cell that have a cylindrical and conical structure, this research presents the extensions toward the studies of the wave motions for straight and curved bars with finite element simulations and experiment studies. The results show that the hybrid cylindrical and conical periodic structures can be effective in terms of wave motion control and stiffness. Full article
(This article belongs to the Special Issue Noise Reduction and Vibration Isolation)
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18 pages, 27429 KiB  
Article
Vibration Isolation of a Surveillance System Equipped in a Drone with Mode Decoupling
by Yun-Ho Shin, Donggeun Kim, Seho Son, Ji-Wan Ham and Ki-Yong Oh
Appl. Sci. 2021, 11(4), 1961; https://doi.org/10.3390/app11041961 - 23 Feb 2021
Cited by 1 | Viewed by 2798
Abstract
Vibration isolation with mode decoupling plays a crucial role in the design of an intelligent robotic system. Specifically, a coupled multi-degree-of-freedom (multi-DOF) model accurately predicts responses of system dynamics; hence, it is useful for vibration isolation and control with mode decoupling. This study [...] Read more.
Vibration isolation with mode decoupling plays a crucial role in the design of an intelligent robotic system. Specifically, a coupled multi-degree-of-freedom (multi-DOF) model accurately predicts responses of system dynamics; hence, it is useful for vibration isolation and control with mode decoupling. This study presents a vibration isolation method with mode decoupling based on system identification, including a coupled multi-DOF model to design intelligent robotic systems. Moreover, the entire procedure is described, including the derivation of the governing equation of the coupled multi-DOF model, estimation of the frequency response function, and parameter estimation using least squares approximation. Furthermore, the suggested methods were applied for a mobile surveillance system suffering from resonances with mode coupling; it made the monitoring performance of the surveillance camera deteriorate. The resonance problem was mitigated by installing vibration isolators, but limited to eliminate the coupling effects of natural frequency deterioration performances of vibration isolation. More seriously, system identification with a simple decoupled model limits the prediction of this phenomenon. Hence, it is difficult to enhance the performance of vibration isolators. In contrast, the presented method can accurately predict the vibration phenomenon and plays a critical role in vibration isolation. Therefore, dynamic characteristics were predicted based on a vibration isolator using the coupled three-DOF model, and a final suggestion is presented here. The experiments demonstrated that the suggested configuration decreased vibration up to 98.3%, 94.0%, and 94.5% in the operational frequency range, i.e., 30–85 Hz, compared to the original surveillance system in the fore-after, side-by-side, and vertical directions, respectively. The analysis suggests that the present method and procedure effectively optimize the vibration isolation performances of a drone containing a surveillance system. Full article
(This article belongs to the Special Issue Noise Reduction and Vibration Isolation)
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21 pages, 8865 KiB  
Article
Development of Post Processing for Wave Propagation Problem: Response Filtering Method
by Hyeong Seok Koh, Jong Wook Lee, Kiwoon Kwon and Gil Ho Yoon
Appl. Sci. 2020, 10(24), 9032; https://doi.org/10.3390/app10249032 - 17 Dec 2020
Cited by 1 | Viewed by 1751
Abstract
This study develops a new response filtering approach for recovering dynamic mechanical stresses under impact loading. For structural safety, it is important to consider the propagation of transient mechanical stresses inside structures under impact loads. Commonly, mechanical stress waves can be obtained by [...] Read more.
This study develops a new response filtering approach for recovering dynamic mechanical stresses under impact loading. For structural safety, it is important to consider the propagation of transient mechanical stresses inside structures under impact loads. Commonly, mechanical stress waves can be obtained by solving Newton’s second law using explicit or implicit finite element procedures. Regardless of the numerical approach, large discrepancies called the Gibb’s phenomenon are observed between the numerical solution and the analytical solution. To reduce these discrepancies and enhance the accuracy of the numerical solution, this study develops a response filtering method (RFM). The RFM averages the transient responses within split time domains. By solving several benchmark problems and analyzing the stresses in the frequency domain, it was possible to verify that the RFM can provide an improved solution that converges toward the analytical solution. A mathematical theory is also presented to correlate the relationship between the filtering length and the frequency components of the filtered stress values. Full article
(This article belongs to the Special Issue Noise Reduction and Vibration Isolation)
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15 pages, 8355 KiB  
Article
Experimental Study on the Dynamic Characteristics of Hydro-Pneumatic Semi-Active Suspensions for Agricultural Tractor Cabins
by Kyujeong Choi, Jooseon Oh, Heung-Sub Kim, Hyun-Woo Han, Jung-Ho Park, Geun-Ho Lee, Jaho Seo and Young-Jun Park
Appl. Sci. 2020, 10(24), 8992; https://doi.org/10.3390/app10248992 - 16 Dec 2020
Cited by 10 | Viewed by 2600
Abstract
This study aims to establish a test method to obtain the dynamic characteristics of hydraulic-pneumatic semi-active suspensions used in tractor cabins. Because dynamic characteristics are utilized in simulation models for developing suspension control logic and must be secured to improve control performance, an [...] Read more.
This study aims to establish a test method to obtain the dynamic characteristics of hydraulic-pneumatic semi-active suspensions used in tractor cabins. Because dynamic characteristics are utilized in simulation models for developing suspension control logic and must be secured to improve control performance, an accurate test method must be established. The dynamic characteristics of the suspension, i.e., the spring constant and damping coefficient, were obtained by changing the current and velocity conditions. An exciter was used as a test device to control the displacement and velocity of the hydraulic cylinder. In order to derive the spring constant of the suspension, a low-speed reciprocating motion test was performed to obtain the force-displacement diagram and to derive the damping coefficient; 48 tests were performed under 6 velocity conditions and 8 current conditions to obtain a force-velocity diagram for each result. The spring constant of the suspension was confirmed using the slope of the trend line in the force-displacement diagram obtained through the low-speed reciprocating motion test of the suspension. In addition, the damping coefficient was calculated using the force-velocity diagram obtained through the reciprocating motion test of the suspension under various current and velocity conditions. Full article
(This article belongs to the Special Issue Noise Reduction and Vibration Isolation)
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