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Abstract and 1 introduction
2 cell design unit and analysis
3 experimental descriptions and cell cell
4 AM Labyrinthine
4.1 The design and manufacture of the painting
4.2 FE model AM
4.3 AM Description of the board
4.4 AM The results of the painting of the painting
5 numerical evaluation of the various solutions of the maze’s sound absorption board
5.1 MacROCell with support cavity
5.2 Results
Conclusions, estimates and references
The first appendix
3 experimental descriptions and cell cell
In order to verify the authenticity of the design predictions and assess the efficiency of the UC -length sound wave absorption, we first make natural occurrence measurements on different types of UCS in the Dagge pipe. UCS consists of a square cavity inside a solid cylinder, where the internal solid walls form a maze style. UC samples are made of PLA dowry tube measurements using the Digilab Filament 3D printer and in Veroyellow using the Stratasys J750 FDM 3D printer. Polymers have similar mechanical properties, which correspond to the strict wall hypothesis used in simulation.
\ The preparation of the condensed tube has been clarified in Figure 4. Resistance measurements are made according to ISO 10534-2 [41] And ASTM E1050-19 [42] (Microphone Dual Technology), in order to measure the absorption of natural occurrence (α0), usually affected by the pressure wave [43]. Sensors are performed using the HW -Act and -stl tube (Siemens, Munich, Germany), with a diameter of 35 mm and equipped with a GRAS 46BD microphone installed on 1/4 inch (GRAS, Hallte, Denmark) a white noise source, i.e. aluminum driver 2. The method allows the exact sound pressure capacity and phase measurements in the entire frequency range, or 100-5000 Hz [43]With a spectral accuracy of 2 Hz. The sample holder consists of a tube with a rigid, sliding piston. A specific plastic sample holder is used as shown in Figure 4B. The method allows better control in placing different samples in the granulated sample holder. 3D printed samples have a general reflective surface and diameter that allows disparity such as the peripheral effect that has been discussed in [44] It can be considered slim. The effect of any potential violations in the samples, especially on the edges, is taken into account by repeating the tests for each structure with three nominal identical samples, to evaluate cloning. The temperature and air pressure are monitored by calibration transformers.
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\ Frequent measurements are performed on all UC, to evaluate cloning. The sound pressure is measured by two microphones that were placed at a distance of 29 mm from each other along the length of the tube. The Spectrum of the UC [32]. This procedure is repeated several times for each experimental composition to reduce dispersion in measurements.
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::: Information about this paper Available on Arxiv Under CC BY-NC-ND 4.0 Action License.
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Authors:
(1) F. nistri, Department of Applied Science and Technology, Politecnico Di Torino, Turin, Italy, Politecnico Di Milano, Milan, Italy;
(2) VH Kamrul, Politecnico Di Milano, Milan, Italy;
(3) L. Bettini, politecnico di Milano, Milan, Italy;
(4) E. Musso, Politecnico Di Milano, Milan, Italy;
(5) D. Piciucco, politecnico di Milano, Milan, Italy;
(6) M. Zamello, Politecnico Di Milano, Milan, Italy;
(7) In its capacity Gliozzi, Department of Applied Science and Technology, Politecnico di Torino, Turin, Italy;
(8) Ao Krushynska, College of Science and Engineering, University of Gronengen, Grungen, Netherlands;
(9) NM PUGNO, Biomedical Laboratory, Bionic, Nano, Meta Mateials & Mechanic, University of Tinto, Trento, Italy, College of Engineering and Materials Science, Queen Mary University in London, UK;
(10) L. Sangiuliano, SRL, Milan, Italy;
(11) L. Shtrepi, “Galileo Ferraris”, Politecnico Di Torino, Turin, Italy;
(12) F. Bosia, Department of Applied Science and Technology, Politecnico Di Torino, Turin, Italy and identical author (Federico.bosia@polito.it).
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