公开(公告)号：US20190185149A1

公开(公告)日：2019-06-20

申请号：US15849365

申请日：2017-12-20

Applicant: X Development LLC

Inventor： Giulia Pantalone ,  Adam Woodworth ,  Eric Teller ,  Ealgoo Kim ,  Jacob Huffman ,  Martin Kubie

IPC: B64C27/00 ,  B64C39/02 ,  B64C27/14 ,  B64D31/00 ,  G10K11/178

CPC classification number: B64C27/001 ,  B64C27/14 ,  B64C39/024 ,  B64C2201/027 ,  B64C2201/042 ,  B64C2201/104 ,  B64C2201/108 ,  B64C2201/141 ,  B64C2201/146 ,  B64D31/00 ,  B64D31/06 ,  G05D19/02 ,  G10K11/1785 ,  G10K2210/121 ,  G10K2210/1281 ,  G10K2210/3044 ,  H02P7/00

Abstract: A technique of controlling tonal noises produced by an unmanned aerial vehicle (UAV) includes generating thrust with a plurality of rotor units mounted to the UAV to propel the UAV into flight. Each of the rotor units includes a bladed rotor. A rotation rate or a phase delay of at least one of the rotor units is adjusted relative to another of the rotor units. The adjustment causes a spread in the tonal noises generated by the rotor units.