Unmanned aerial vehicle motor driving randomization for noise abatement
First Claim
1. An unmanned aerial vehicle (UAV) configured to deliver a package, the UAV comprising:
- a frame;
a plurality of motors including at least a first motor and a second motor, each motor coupled to the frame and configured to rotate at least one propeller to cause lift and propulsion for the UAV;
a power source to selectively provide power to the plurality of motors;
a control system in communication with at least the plurality of motors and the power source, the control system to generate flight control signals used to control at least operation of the plurality of motors, the control system to perform operations comprising;
determining a flight control of the UAV, the flight control of the UAV including at least a heading and a velocity of the UAV;
determining a first motor speed of the first motor of the UAV, wherein the first motor speed is based in part on the flight control of the UAV; and
determining a second motor speed of at least the second motor of the UAV, wherein the second motor speed is based in part on the flight control of the UAV; and
a randomizer controller configured to modify at least one flight control signal, the randomizer controller to perform operations comprising;
determining that the UAV is operating in a noise-sensitive location;
determining a first randomization threshold, the first randomization threshold including an upper threshold value and a lower threshold value for the first motor speed based on the flight control of the UAV;
generating a first random value within the first randomization threshold;
calculating a first randomization motor speed by applying the first random value to the first motor speed; and
sending the first randomization motor speed to the control system, the first randomization motor speed, when implemented by the control system with the second motor speed, to reduce a tonal quality of a noise signature of the UAV.
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Abstract
This disclosure is directed to varying a speed of one or more motors in an unmanned aerial vehicle (UAV) to reduce unwanted sound (i.e., noise) of the UAV. A UAV may include motors coupled with propellers to provide lift and propulsion to the UAV in various stages of flight, such as while ascending, descending, hovering, or transiting. The motors and propellers may generate noise, which may include a number of noise components such as tonal noise (e.g., a whining noise such as a whistle of a kettle at full boil) and broadband noise (e.g., a complex mixture of sounds of different frequencies, such as the sound of ocean surf). By varying the controls to the motors, such as by varying the speed or revolutions per minute (RPM) of a motor during operation by providing random or pseudo-random RPM variations, the UAV may generate a noise signature with reduced tonal noise.
39 Citations
19 Claims
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1. An unmanned aerial vehicle (UAV) configured to deliver a package, the UAV comprising:
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a frame; a plurality of motors including at least a first motor and a second motor, each motor coupled to the frame and configured to rotate at least one propeller to cause lift and propulsion for the UAV; a power source to selectively provide power to the plurality of motors; a control system in communication with at least the plurality of motors and the power source, the control system to generate flight control signals used to control at least operation of the plurality of motors, the control system to perform operations comprising; determining a flight control of the UAV, the flight control of the UAV including at least a heading and a velocity of the UAV; determining a first motor speed of the first motor of the UAV, wherein the first motor speed is based in part on the flight control of the UAV; and determining a second motor speed of at least the second motor of the UAV, wherein the second motor speed is based in part on the flight control of the UAV; and a randomizer controller configured to modify at least one flight control signal, the randomizer controller to perform operations comprising; determining that the UAV is operating in a noise-sensitive location; determining a first randomization threshold, the first randomization threshold including an upper threshold value and a lower threshold value for the first motor speed based on the flight control of the UAV; generating a first random value within the first randomization threshold; calculating a first randomization motor speed by applying the first random value to the first motor speed; and sending the first randomization motor speed to the control system, the first randomization motor speed, when implemented by the control system with the second motor speed, to reduce a tonal quality of a noise signature of the UAV. - View Dependent Claims (2, 3, 4, 5)
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6. A processor-implemented method comprising:
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determining a flight control of an unmanned aerial vehicle (UAV), the flight control of the UAV including at least a heading and a velocity of the UAV; setting a first motor speed of a first motor of the UAV, wherein the first motor speed is based in part on the flight control of the UAV; generating a first random value within a randomization threshold, the randomization threshold being an allowable deviation from the flight control of the UAV; determining a randomized motor speed based at least in part by applying the first random value to the first motor speed; and driving the first motor of the UAV at the randomized motor speed to reduce a tonal quality of a noise signature of the UAV. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An unmanned aerial vehicle (UAV) comprising:
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one or more processors; memory coupled to the one or more processors, the memory including one or more modules that are executable by the one or more processors to perform operations comprising; determining a flight control of the UAV, the flight control of the UAV including at least a heading and a velocity of the UAV; setting a first motor speed of a first motor of the UAV, wherein the first motor speed is based in part on the flight control of the UAV; generating a first random value within a randomization threshold, the randomization threshold based in part on the flight control of the UAV; determining a randomized motor speed by applying the first random value to the first motor speed the determining the randomized motor speed including applying a motor speed pattern designed to reduce a tonal quality of a noise signature of the UAV; and causing the first motor of the UAV to operate at the randomized motor speed. - View Dependent Claims (17, 18, 19)
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Specification