Noise could occur anywhere in the aerospace and other fields has a great influence on operation of aircraft. The control sound emission attracted lot attention from economic environmental aspects. Firstly, noise is annoying for passengers pilot may increase risk to be exposed military applications. Secondly, pose damage threat engine equipment due strong pressure oscillation. In addition, combu...

In this paper, we demonstrate how to reduce the noise level of expanded air from pneumatic tools. Instead a muffler, propose collecting system, where expands through tube and expansion collector. We have elaborated mathematical model which illustrates dynamics flow, as well acoustic pressure at end tube. The computational results were compared with experimental data check sound pressure. Moreov...