Spoiler Pressure Biasing for Aircraft Flap Load Relief
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Solution Overview
Problem
Aircraft control surfaces, such as flaps, experience excessive loads during high-speed maneuvers, leading to the need for structural reinforcements and increased weight, which reduces fuel efficiency and maneuverability.
Innovation Solution
Implementing a pressure shape biasing system that uses a flight monitor to determine movement parameters like Mach number, airspeed, or vertical acceleration, and adjusts the position of spoilers to move pressure transitions away from flaps, thereby reducing loads on control surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If structural reinforcements are added to control surfaces to handle high loads, then strength and reliability are improved, but weight increases
Solution Approach 1:
The spoiler is positioned in advance to create a favorable pressure distribution before the aircraft enters high-load maneuvers, preventing excessive loads from developing on the control surfaces in the first place
Solution Approach 2:
The spoiler acts as an intermediary aerodynamic surface that modifies the pressure field between the free stream and the control surface, redistributing loads to protect the flap from excessive stresses
2Reliability
If larger and heavier components are used for control surfaces, then reliability under high load is improved, but fuel efficiency deteriorates
Solution Approach 1:
The pressure shape biasing system activates spoiler positioning before high-load conditions occur, preemptively creating aerodynamic conditions that reduce loads on control surfaces, thereby maintaining reliability without requiring oversized components that would consume additional fuel
Solution Approach 2:
The system dynamically changes aerodynamic parameters by adjusting spoiler position to modify pressure distribution, allowing the aircraft to maintain control surface reliability across varying flight conditions without the penalty of permanently larger components
3Strength
If structural reinforcements are added to control surfaces, then strength is improved, but maneuverability deteriorates
Solution Approach 1:
By preemptively positioning the spoiler to create favorable pressure distribution, the system prevents excessive loads from developing, allowing the aircraft to maintain agile maneuverability without the inertial penalty of heavily reinforced control surfaces
4Reliability
If larger control surface components are used, then reliability under high load is improved, but device complexity increases
Solution Approach 1:
The spoiler serves as a simple intermediary device that modifies the aerodynamic environment around the control surface, providing load relief through aerodynamic pressure redistribution rather than through complex structural modifications to the control surface itself
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the need for structural reinforcements, enhances the maneuverability of aircraft by minimizing weight, and improves fuel efficiency by alleviating load pressures on control surfaces during high-speed maneuvers.
Implementation Method 1
a spoiler controller to adjust a position of a spoiler of the aircraft to reduce pressure on a flap based on the movement parameter by moving a pressure transition away from the flap
Data Source
AI summary
Flap pressure shape biasing is disclosed. A disclosed example apparatus includes a flight monitor to determine a movement parameter of an aircraft, the movement parameter corresponding to at least one of a Mach number of the aircraft, an airspeed of the aircraft, or a vertical acceleration of the aircraft, and a spoiler controller to adjust a position of a spoiler of the aircraft to reduce pressure on a flap based on the movement parameter by moving a pressure transition away from the flap.