Posted December 02, 2018 07:07:20A new approach is needed to understand the acoustical properties of various materials, including acoustically transparent plastics, a new study says.
Researchers from the University of Alberta, Edmonton and the University de Montréal and published their work in the journal Acoustical Engineering.
The team found that, when compared with the acoustic properties of an opaque plastic, an alpine material can be “treated” with acoustic materials that can create “sound” by absorbing the energy from a sound source.
In the study, the researchers applied a method that uses the energy of sound to create acoustic waves.
The acoustic waves are created by adding an “echo energy” to a sound, which is created by the reflection of light from a source.
The researchers also used a technique to amplify the reflected light and “decode” it into acoustic signals, according to the article.
The new study found that the acoustic waves from the alpine materials had significantly higher frequency than those from opaque plastics.
In comparison, the acoustic wave frequencies in transparent plastics were not affected by the treatment process.
“This study is the first to demonstrate the acoustic properties of materials that are transparent,” said lead author James McLeod.
The results also indicate that the “echo effect” of transparent materials is not limited to acoustic sound sources.
McLeod added that the results also have applications for acoustic engineering.
“If you can create acoustic wave reflections in transparent materials, you can do acoustic wave extraction in opaque materials,” he said.
“You can use this to make transparent materials more efficient, to be able to use materials that have less energy and that are more efficient in the production of sound.”
A new technique is needed, he said, because acoustic properties depend on the material and how it is treated.
“In a nutshell, if you treat an opaque material with acoustic waves, the material will have an acoustic effect,” he explained.
“The more reflective surface it is, the more sound it will produce.”
The acoustic wave effect is created when the material absorbs sound waves that reflect off of it.
In the case of opaque plastic materials, the waves absorb a lot of energy, McLeod said.
However, he added, it’s important to understand that the reflected energy does not have to be reflected back to the surface.
In addition to being transparent, alpine plastic has a very high density, meaning that the surface area is relatively large.
That means that the amount of energy that is absorbed by the material is higher than the amount that is reflected back, McLean said.
This means that, if the material was treated with acoustic treatments, it would be possible to generate a “soundscape” of reflections that would make the material appear to reflect the sound in a way that can be heard.
“It’s kind of like a soundscape,” he added.
“There’s a lot going on there that you can hear, even though it’s not necessarily being perceived.”
I think it’s really cool that we can do these acoustic techniques on opaque materials, so that we’re able to create a sound-synthesis technique that can help engineers understand acoustic properties in transparent plastic.