| Abstract [eng] |
At a time of rapid advances in unmanned aircraft and increasing number of users, the problems encountered is increased too. One of these problems - the noise. Therefore, in unmanned aircraft operators community there is a tendency to reduce that noise. This paper will address the noise occured in quadcopter - unmanned aircraft with four symmetrically and plane - alligned propellers. Final work’s aim is to expermentically determine quadcopter noise levels at different quadcopter types and loads. For the quadcopter experiment, it was to choose small and medium types of quadcopters - 250 mm and 450 mm. The study compared two materials acoustic properties and it was found out, which material is better in terms of isolating quadcopter’s noise. The final work research have been done with the help of program package MATLAB, calculations were carried out and the results were compared with Lithuania’s noise hygiene standards, and other values. |
