Abstract
In this paper, we demonstrate how to reduce the noise level of expanded air from pneumatic tools. Instead of a muffler, we propose the expanded collecting system, where the air expands through the pneumatic tube and expansion collector. We have elaborated a mathematical model which illustrates the dynamics of the air flow, as well as the acoustic pressure at the end of the tube. The computational results were compared with experimental data to check the air dynamics and sound pressure. Moreover, the study presents the methodology of noise measurement generated in a pneumatic screwdriver in a quiet back room and on a window-fitting stand in a production hall. In addition, we have performed noise measurements for the pneumatic screwdriver and the pneumatic screwdriver on an industrial scale. These measurements prove the noise reduction of the pneumatic tools when the expanded collecting system is used. When the expanded collecting system was applied to the screwdriver, the measured Sound Pressure Level (SPL) decreased from 87 to 80 dB(A).
Highlights
The expanded collecting system captures exhaust air from pneumatic tools and machines outlets scattered throughout the production hall in one main collector
The collected exhaust air in one place can be neutralized or thrown outside the production hall and reducing the noise generated as a result of air expansion in the working environment.This solution has been tested on the industrial scale
To illustrate how our approach works, we built a mathematical model of the entire process of sound generation during the exhaust air expansion
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Manufacturing plants very often use compressed air for production lines and machines. All pneumatic machines and tools tend to produce noise, which is related to the discharge of high-pressure air through the exhaust port [1]. The unfavorable effect of air leaks from the installation may increase the noise level [2]. In addition to the exhaust noise, mechanical noise, from percussive tools, may be present
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