Voelker et al 2023a - Revision history

Zachary.rho at 15:10, 10 August 2023

2023-08-10T15:10:29Z

Tomamil: Tomamil moved page Review 531681295717 to Voelker et al 2023a

2023-08-08T23:00:28Z

Tomamil moved page Review 531681295717 to Voelker et al 2023a

Zachary.rho at 21:16, 8 August 2023

2023-08-08T21:16:33Z

Zachary.rho at 21:15, 8 August 2023

2023-08-08T21:15:29Z

Zachary.rho at 21:14, 8 August 2023

2023-08-08T21:14:57Z

Zachary.rho at 21:14, 8 August 2023

2023-08-08T21:14:35Z

Zachary.rho at 21:14, 8 August 2023

2023-08-08T21:14:04Z

Zachary.rho at 21:11, 8 August 2023

2023-08-08T21:11:42Z

Zachary.rho at 21:10, 8 August 2023

2023-08-08T21:10:55Z

Zachary.rho at 21:10, 8 August 2023

2023-08-08T21:10:09Z

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 Generally, the composites with higher densities were able to suppress a greater magnitude of noise. The PB composite had the highest density (0.95 g/cm3) and greatest percent noise reduction while the paper substrate by itself had one of the lowest densities and the lowest percent noise reduction. Higher density materials have a higher degree of suppression when compared to lower density materials [34]. Although lower densities have the ability to absorb sound waves, if the density is too low, sound waves may be able to pass through the material, leading to a lower degree of suppression [35]. Thicker and higher density materials had the best success in suppressing noise, since it is more difficult for sound waves to permeate through the material, leading to a higher degree of reflection [23].  The PP composite had a similar microstructure as expanded polystyrene, a standard acoustic insulation that is currently sold commercially (Figure 10).
-            Mycelium by itself is naturally fluffy and fibrous with pockets of air. Air pockets within the substrate can help absorb sound if infiltrated by another material, in this case mycelium. When sound waves enter an air pocket filled with mycelium, they are absorbed by the dense fibers or particles within the pocket.
+Mycelium by itself is naturally fluffy and fibrous with pockets of air. Air pockets within the substrate can help absorb sound if infiltrated by another material, in this case mycelium. When sound waves enter an air pocket filled with mycelium, they are absorbed by the dense fibers or particles within the pocket.
 [[File:Draft_Voelker_516016153_9649_fig10.png|366x366px]]

← Older revision		Revision as of 21:16, 8 August 2023
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	Figure 8: Percent Noise Reduction for Each Test Material		Figure 8: Percent Noise Reduction for Each Test Material

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 <nowiki>[23] Starodubtseva, T., Aksomitny, A., Saldaev, V (2018). The Study of Soundproofing Properties of Wood Polymer-Sand Composite. Solid State Phenomena, 284 993–998 https://www.scientific.net/SSP.284.993</nowiki>
-[24] Cao, L., Qiuxia, F., Si, Y., Ding, B. & Yu, J. (2018). ''Porous materials for sound absorption''<nowiki>. Composites Communications, 10, 25-35. https://www.sciencedirect.com/science/article/abs/pii/S2452213918300433#:~:text=As%20the%20most%20abundantly%20used,
+[24] Cao, L., Qiuxia, F., Si, Y., Ding, B. & Yu, J. (2018). ''Porous materials for sound absorption''<nowiki>. Composites Communications, 10, 25-35. https://www.sciencedirect.com/science/article/abs/pii/S2452213918300433#:~:text=As%20the%20most%20abundantly%20used,the%20field%20of%20sound%20absorption</nowiki>
 the%20field%20of%20sound%20absorption</nowiki>
 [25] Berardi, U., Iannace, G., 2015. ''Acoustic characterization of natural fibers for sound absorption applications''. Build. Environ. 94, 840–852

@@ Line 304: / Line 304: @@
 <nowiki>[23] Starodubtseva, T., Aksomitny, A., Saldaev, V (2018). The Study of Soundproofing Properties of Wood Polymer-Sand Composite. Solid State Phenomena, 284 993–998 https://www.scientific.net/SSP.284.993</nowiki>
-[24] Cao, L., Qiuxia, F., Si, Y., Ding, B. & Yu, J. (2018). ''Porous materials for sound absorption''<nowiki>. Composites Communications, 10, 25-35. https://www.sciencedirect.com/science/article/abs/pii/S2452213918300433#:~:text=As%20the%20most%20abundantly%20used,the%20field%20of%20
+[24] Cao, L., Qiuxia, F., Si, Y., Ding, B. & Yu, J. (2018). ''Porous materials for sound absorption''<nowiki>. Composites Communications, 10, 25-35. https://www.sciencedirect.com/science/article/abs/pii/S2452213918300433#:~:text=As%20the%20most%20abundantly%20used,
-sound%20absorption</nowiki>
+the%20field%20of%20sound%20absorption</nowiki>
 [25] Berardi, U., Iannace, G., 2015. ''Acoustic characterization of natural fibers for sound absorption applications''. Build. Environ. 94, 840–852

@@ Line 304: / Line 304: @@
 <nowiki>[23] Starodubtseva, T., Aksomitny, A., Saldaev, V (2018). The Study of Soundproofing Properties of Wood Polymer-Sand Composite. Solid State Phenomena, 284 993–998 https://www.scientific.net/SSP.284.993</nowiki>
-[24] Cao, L., Qiuxia, F., Si, Y., Ding, B. & Yu, J. (2018). ''Porous materials for sound absorption''<nowiki>. Composites Communications, 10, 25-35. https://www.sciencedirect.com/science/article/abs/pii/S2452213918300433#:~:text=
+[24] Cao, L., Qiuxia, F., Si, Y., Ding, B. & Yu, J. (2018). ''Porous materials for sound absorption''<nowiki>. Composites Communications, 10, 25-35. https://www.sciencedirect.com/science/article/abs/pii/S2452213918300433#:~:text=As%20the%20most%20abundantly%20used,the%20field%20of%20
-As%20the%20most%20abundantly%20used,the%20field%20of%20sound%20absorption</nowiki>
+sound%20absorption</nowiki>
 [25] Berardi, U., Iannace, G., 2015. ''Acoustic characterization of natural fibers for sound absorption applications''. Build. Environ. 94, 840–852

← Older revision	Revision as of 23:00, 8 August 2023
(No difference)

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 Additionally, the thermal conductivity value of each test material was calculated using a modified Fitch method for the hot water trials. Chamber A was considered the heat source, while Chamber B was considered the heat sink.  T<sub>i</sub> and T<sub>c</sub> represent the initial temperature and final temperature of Chamber B, in <sup>o</sup>C, respectively. L represents the thickness of the test material (0.1m). m represents the mass of the air in Chamber B (0.062kg). c represents the specific heat of the air in the heat sink (718J/kg/K). t represents the duration of the trial (2400s). T∞ represents the average temperature of the heat source, in <sup>o</sup>C and was calculated using equation 2. Equation 1 was then used to calculate the thermal conductivity.
-[[
+[[File:Review_531681295717_7616_thermal.png|417x417px]]
-[[File:Review_531681295717_7616_thermal.png]]
 ]]
 Figure 3: Low-Cost System for Testing Thermal Insulating Properties

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 Figure 3: Low-Cost System for Testing Thermal Insulating Properties
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 To reduce cost, an impedance tube was constructed out of standard PVC plastic pipes of different sizes (Figure 4). This novel system was used to measure the ability of the various test materials to reduce sound. One end of the tube contained a sound source (MIFA Bluetooth speaker) which was used to produce a consistent wave of broadband noise. A sample chamber was constructed out of 7.62cm diameter PVC Tube, a PVC Converter and flanges. The sample holder played a critical role of aligning the test piece in normal position to the direction of traveling planar waves. Connecting the tubes with standard flanges reduced the cost significantly. Standard PVC flanges are readily available in the market with minimum conditioning required to be used for the desired purpose. Flanges provide an easy way to secure the sample into place and make the assembly/disassembly simpler without adding more cost to the apparatus. Flanges were used for quick release and easy access to the sample in the test holder. Wing, nuts and bolts were used to tighten the flanges. With no material in the testing chamber, a 5 second long 200 Hz noise was played, and the amplitude of the generated sine curve was measured.  Then, the same 5 second long 200 Hz noise was played with the various testing materials in the testing chamber, and the amplitude of the generated sine curve was measured. From here, the percent reduction in noise could be calculating for each material using the amplitude of the sine curve for the no material trials, and the amplitude of the sine curve for the various materials.
-[[File:Review_531681295717_6013_impedance.png]]
+[[File:Review_531681295717_6013_impedance.png|462x462px]]
 Figure 4: Low-Cost Impedance Tube
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 Figure 5 shows the schematic of the novel system for testing electrical current. An Elenco DC Power Supply (model XP-752A) was connected to an outlet in the wall, and used to generate a flow of electricity. Alligator clips came out of the power supply, and through holes cut out of a Styrofoam box. The test material was suspended between the alligator clips inside of the Styrofoam box. The power supply was used to generate a voltage of 50 volts, and measure the resulting current (in amps).
-[[File:Review_531681295717_7571_electric.png]]
+[[File:Review_531681295717_7571_electric.png|508x508px]]
 Figure 5: Schematic of Low-Cost Electric Current Testing System