Ducted Fan Air Data System
First Claim
Patent Images
1. An air data system for an air-vehicle, comprising in combination:
- an air duct having a lip;
a plurality of air pressure sensors placed around the lip of the air duct operable to measure pressure data; and
a processor operable to receive the pressure data from the plurality of air pressure sensors and calculate speed and direction of airflow surrounding the air-vehicle based on the pressure data measured by the plurality of air pressure sensors.
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Abstract
An air data system and method for a ducted fan air-vehicle is described. The air data system includes a plurality of air pressure sensors placed around a lip of an air duct of the ducted fan air-vehicle. The air data system calculates the speed and direction of airflow surrounding the ducted fan air-vehicle based on pressure data measured across the lip of the air duct. Additionally, the air data system may estimate forces generated by airflow surrounding the air-vehicle.
57 Citations
20 Claims
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1. An air data system for an air-vehicle, comprising in combination:
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an air duct having a lip; a plurality of air pressure sensors placed around the lip of the air duct operable to measure pressure data; and a processor operable to receive the pressure data from the plurality of air pressure sensors and calculate speed and direction of airflow surrounding the air-vehicle based on the pressure data measured by the plurality of air pressure sensors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of measuring air data for a ducted fan air-vehicle, comprising in combination:
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placing a plurality of air pressure sensors within a lip of an air duct of the air-vehicle such that the plurality of air pressure sensors includes at least one pair of air pressure sensors that measure pressure at a first point on the lip of the air duct and at a second point on the lip of the air duct substantially 180 degrees away from the first point; and connecting a processor to the plurality of air pressure sensors, wherein the processor is operable to calculate speed and direction of airflow surrounding the air-vehicle based on air that flows through the at least one pair of air pressure sensors. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for calculating speed and direction of airflow surrounding a ducted fan air-vehicle, comprising in combination:
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obtaining a plurality of pressure measurements within a lip of an air duct of the air-vehicle; compensating the plurality of pressure measurements for vehicle attitude; calculating a plurality of pressure differentials across the lip of the air duct; compensating the plurality of pressure differentials for a fan speed of the fan of the air-vehicle and air density to arrive at a plurality of compensated pressure differentials; applying a linear velocity curve fit for the compensated pressure differentials; generating a plurality of individual velocity vectors across the lip of the air duct based on the linear velocity curve fit for the compensated pressure differentials; and generating a total velocity vector of the airflow based on the plurality of individual velocity vectors across the lip of the air duct. - View Dependent Claims (19, 20)
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Specification