Abstract
In this research we developed the methods and technologies for manufacturing sound-absorbing structures (SAS) samples using Dimension SST 1200 and Envisiontec Perfactory XEDE units. While testing the technique, the shortcomings of both units were identified. To eliminate the identified shortcomings, we formulated some recommendations and adjusted the main stages of manufacturing SAS with the application of these methods. Experimental acoustic studies of the produced reference samples of the SAS on an interferometer with normal incidence of waves were carried out. Acoustic tests of samples of SAS manufactured with consideration of the developed technological solutions showed good sustainability of the obtained results, we revealed strong correlation with the samples from polymer composite materials manufactured using standard plant technologies.
Highlights
In the 21st century there is a rapid development of civil aviation and the air transportation market, which is a catalyst for economic growth
One of the main components of aircraft noise is the noise generated by propulsion systems - turbojet two-loop engines (TTLE) [3]
In the laboratory acoustic tests we studied the characteristics of reference samples, as well as samples manufactured using standard plant technologies from polymer composite materials
Summary
In the 21st century there is a rapid development of civil aviation and the air transportation market, which is a catalyst for economic growth. On the other hand, existing SAS fabrication technologies cannot guarantee the defect-free creation of even such simple designs, as a result of which the acoustic characteristics of the manufactured SASs can differ markedly from those that are expected. This effect reveals itself already at the stage of testing the samples of the developed SAS in installations "Interferometer with normal incidence of waves" and "Interferometer with flow". Acoustic tests of printed SAS samples on an interferometer with normal incidence of waves were carried out
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