Development of a UAV Test Stand

Performing acoustic measurements on a multicopter in a confined space, such as a small anechoic chamber, can be an extremely difficult and time-consuming process. Inherent risks to the vehicle, laboratory equipment, and technicians are present when a multicopter is operated. In addition, standard multicopter maneuvers are difficult to conduct due to spatial constraints, and obtaining near field acoustic measurements is dangerous due to the inherent dynamic variability that occurs during flight. A UAV test stand was developed to remove these limitations and allow for rapid and safe acoustic measurements in a controlled environment. The design, development, and initial measurements are discussed. The performance and acoustic response of the brushless electric motors and propellers are assessed to examine the effectiveness of the test stand. The contribution noise from the test stand and a measurement grid are evaluated, as well as the influence of stationary propeller testing. Lastly, the pros and cons of using a test stand for UAV measurements are discussed.