轻型四旋翼无人机声场特性研究

Study on acoustic field characteristics of light quadrotor unmanned aerial vehicle

无人机声场特性直接反映无人机飞行过程中的稳定性和其他相关特性,该文通过构建测试平台对轻型四旋翼无人机在不同电流、距离下的声场进行测试;并对固定飞行高度下的无人机声场频率进行试验。试验结果表明:无人机声压强度与声音的传播距离呈对数关系;随着电流的增加,声压衰减系数逐渐减小;在无人机声场衰减模型中常数项基本保持不变,且只和环境相关。同时无人机飞行中声场频率集中在 10 kHz 左右;随着声场传播距离的增大,无人机声压剧烈减少。该研究可为无人机的相关研究与发展提供理论和实践的依据。

Acoustic field data directly map stability and other performance of unmanned aerial vehicle (UAV). this paper construct the experiment of acoustic field on UAV with different distance, working current and other parameters,and the sound field frequency of UAV under fixed flight altitude is tested. The experimental results show that the logarithm mathematical model was established between the distance and the intensity of sound. As the current increases, the attenuation coefficient would decrease. In the UAV sound field attenuation model, the constant coefficient is basically unchanged, and is only related to the environment. The frequency of sound field in UAV flight is about 10 kHz. With the propagation distance of sound field increasing, the sound pressure of UAV decreases dramatically.This study can provide theoretical and practical basis for the research and development of UAV.