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Search Results (3)

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Keywords = micro-perforated shell

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22 pages, 7898 KB  
Article
Study on the Vibration and Sound Radiation Performance of Micro-Perforated Laminated Cylindrical Shells
by Bin Li, Ning Wang, Zengquan Zheng, Wenjian Kuang, Langlang Wei, Yihao Chen, Jiangbin Hou and Shuang Chen
Appl. Sci. 2023, 13(21), 11939; https://doi.org/10.3390/app132111939 - 31 Oct 2023
Cited by 4 | Viewed by 2690
Abstract
In response to the problem of vibration and noise reduction in equipment with cylindrical shell structures, this paper focuses on the micro-perforated laminated cylindrical shell structure and establishes its finite element model. Through comparative analysis with experimental results, the reliability of the finite [...] Read more.
In response to the problem of vibration and noise reduction in equipment with cylindrical shell structures, this paper focuses on the micro-perforated laminated cylindrical shell structure and establishes its finite element model. Through comparative analysis with experimental results, the reliability of the finite element modeling method is verified. Based on this, the paper places particular emphasis on the vibration and acoustic radiation performance of the structure in the 1–1000 Hz frequency range under free conditions to understand the impact of different laminated shell structures, micro-perforation parameters (porosity, aperture), sound-absorbing foam materials, and placement methods. The results indicate that micro-perforated structures can efficiently reduce the structural radiated sound power level at specific frequencies, but the overall reduction in radiated sound power level is not significant. Various types of foam are effective in reducing the structural radiation acoustic power level, with polyurethane performing best among them. Changing the location of foam placement has a relatively insignificant impact on the structural radiation acoustic power level. Full article
(This article belongs to the Section Acoustics and Vibrations)
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26 pages, 4328 KB  
Article
Metabolically Doping of 3D Diatomaceous Biosilica with Titanium
by Weronika Brzozowska, Myroslav Sprynskyy, Izabela Wojtczak, Przemysław Dąbek, Michał J. Markuszewski, Andrzej Witkowski and Bogusław Buszewski
Materials 2022, 15(15), 5210; https://doi.org/10.3390/ma15155210 - 27 Jul 2022
Cited by 9 | Viewed by 3018
Abstract
Diatoms represent, in terms of species number, one of the largest groups of microalgae that have the ability to synthesize phenomenal mineral composites characterized by complex hierarchical structures. Their shells, called frustules, create intricately ornamented structures, reminiscent of the most sophisticated, natural mosaics. [...] Read more.
Diatoms represent, in terms of species number, one of the largest groups of microalgae that have the ability to synthesize phenomenal mineral composites characterized by complex hierarchical structures. Their shells, called frustules, create intricately ornamented structures, reminiscent of the most sophisticated, natural mosaics. Ordinated pore systems perforate siliceous walls of the frustules with diameters ranging from nano to micro-scale, forming openwork three-dimensional silica structures. The use of these features is one of the main challenges in developing new technological solutions. In this study we assess the ability of selected diatom species (Pseudostaurosira trainorii) for metabolic insertion of soluble titanium from the culture medium into the structure of amorphous silica cell walls by its cultivation in laboratory conditions. The study is aimed at obtaining new and strengthening the already existing optical properties of diatomaceous biosilica. The physicochemical properties of the obtained materials have been studied using a series of instrumental methods. Full article
(This article belongs to the Special Issue Applications of Diatoms in the Fields of Environment Resuscitation, Biomedical Research and Nanoparticles Production)
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25 pages, 11295 KB  
Article
Sound Insulation and Reflection Properties of Sonic Crystal Barrier Based on Micro-Perforated Cylinders
by Stefan M. Dimitrijević, Víctor M. García-Chocano, Francisco Cervera, Emelie Roth and José Sánchez-Dehesa
Materials 2019, 12(17), 2806; https://doi.org/10.3390/ma12172806 - 31 Aug 2019
Cited by 22 | Viewed by 7171
Abstract
A sonic crystal barrier, consisting of empty micro-perforated cylindrical shells, was built on the campus at the Universitat Politècnica de València in 2011 and characterised by using a non-standardised measurement technique. In this paper, the sonic crystal barrier, upgraded with rubber crumb inside [...] Read more.
A sonic crystal barrier, consisting of empty micro-perforated cylindrical shells, was built on the campus at the Universitat Politècnica de València in 2011 and characterised by using a non-standardised measurement technique. In this paper, the sonic crystal barrier, upgraded with rubber crumb inside the micro-perforated cylindrical shells, was characterised by using standardised measurement techniques according to EN 1793-5 and EN 1793-6. As a result of the characterisation, sound insulation properties of the barrier were shown to be a combination of the absorptive properties of the individual building units and the reflective properties of their periodic distribution. In addition, its performance was compared with a similar barrier consisting of rigid polyvinyl chloride (PVC) cylinders, which was recently characterised using the same standardised techniques. In comparison with the barrier based on PVC cylinders, the barrier investigated here produced a broadband enhancement of the sound insulation and lower reflection indices in the targeted frequency range. It was also shown that the influence of leakage under the barrier and the width of the temporal window on sound insulation was negligible. While EN 1793-5 and 1793-6 allow a direct comparison of the performance of different noise barriers, the applicability to this new type of barriers requires further investigation. Full article
(This article belongs to the Special Issue Advances in Acoustic Metamaterials)
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