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US 9,957,053 B2Granted
Helicopter rotor icing detection system and method
AssigneeNorthrop Grumman Systems Corporation
InventorJonathan D. Almond
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Abstract
A system includes a signal monitor to monitor a time rate of change of a revolutions per minute (RPM) trim signal that is received from an RPM command path to control a velocity of a helicopter rotor. An icing detector detects for the presence of ice accumulation on the helicopter rotor by comparing the time rate of change of the RPM trim signal to a predetermined threshold for the time rate of change.
Claims12
A system comprising:
- a signal monitor to monitor a time rate of change of a revolutions per minute (RPM) trim signal that is received from an RPM command path to control a velocity of a helicopter rotor;
- and
- an icing detector to detect for the presence of ice accumulation on the helicopter rotor by comparing the time rate of change of the RPM trim signal to a predetermined threshold for the time rate of change.
A method comprising:
- monitoring, by a controller, a revolutions per minute (RPM) trim signal that is received from an RPM command path to control a velocity of a helicopter rotor;
- determining a time rate of change for the RPM trim signal;
- comparing the time rate of change of the RPM trim signal to a predetermined threshold setting for the time rate of change;
- and
- detecting ice accumulation on the helicopter rotor if the time rate of change for the RPM trim signal exceeds a predetermined threshold for the time rate of change.
2 more elements
Dependencies are inferred from the claim text.