Abstract
"Flying cars", which are being developed in Japan and overseas, are expected to be a new means of transportation for people and things. But noise reduction is essential to use them in residential areas because they may not be able to meet the noise regulations. In this study, we investigated the directivity of a drone propeller’s noise using multiple microphones in order to understand the noise characteristics of a fan for vertical take-off and landing aircraft(VTOL). In addition, a target plate simulating the ground effect was installed downstream of the propeller, and changes in the sound field due to the difference in distance between the target plate and the propeller were investigated. Furthermore, we also grasped the noise reduction effect when the propeller blade has a tip anhedral.
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