Composite Angle of Attack Display for Aircraft Stall Warning
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Solution Overview
Problem
Existing angle of attack indicating systems for aircraft face challenges in providing accurate and easily interpretable readings, with non-normalized systems being cumbersome and normalized systems potentially giving misleading readings due to variations in Mach number.
Innovation Solution
A composite display system that simultaneously shows both normalized and body angle of attack, with fixed position markings and digital indicia, enhancing visibility by zooming and color changes when approaching stall values, thereby providing a clear and accurate representation of the aircraft's angle of attack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-normalized body angle of attack indicators are used, then the angle of attack reading is directly related to aircraft configuration, but the key component slides up and down the scale based on flap position making it difficult to discern at a glance
Solution Approach 1:
The display is segmented into two distinct components: a normalized angle of attack indicator with fixed key reference points (showing proximity to stall) and a body angle of attack indicator showing actual aircraft configuration-based angle. This segmentation allows each indicator to serve its specific purpose without interfering with the other, providing both quick glance awareness and detailed configuration information.
Solution Approach 2:
The normalized angle of attack indicator serves as an intermediary between the raw body angle of attack data and the pilot's need for quick safety assessment. It translates the configuration-dependent body AOA into a standardized scale with fixed key points, mediating the information to provide immediate safety context while preserving the detailed body AOA reading.
2Loss of information
If normalized angle of attack indicators are used, then the display provides fixed key reference points for quick assessment, but variations in Mach number can result in misleading readings
Solution Approach 1:
The system merges both normalized and body angle of attack indicators into a single composite display. The normalized indicator provides fixed key reference points for quick assessment of proximity to stall, while the body angle of attack indicator provides the actual configuration-based reading. Together, they provide both quick glance awareness and accurate measurement without the limitations of either system alone.
3Ease of operation
If only normalized angle of attack display is provided, then the display is simple with fixed reference points, but it may give misleading readings due to Mach number variations
Solution Approach 1:
Each indicator is optimized for its specific function: the normalized indicator provides fixed key reference points for quick assessment with high ease of operation, while the body angle of attack indicator provides configuration-specific accuracy for reliability. The local quality of each display element matches its functional requirement, and together they provide both simplicity and reliability.
4Measurement precision
If only body angle of attack display is provided, then the display shows accurate configuration-based readings, but the key component slides up and down the scale making quick assessment difficult
Solution Approach 1:
The system adds a second dimension to the display by incorporating both normalized and body angle of attack indicators. The normalized indicator provides a standardized reference frame with fixed key points for easy assessment, while the body indicator maintains accuracy. This dimensional addition resolves the contradiction between precision and ease of operation by providing both perspectives simultaneously.
Data Source
AI summary
A composite normalized angle of attack indicating system provides a simultaneous display of both body angle of attack, such as in digital form, and normalized angle of attack for an aircraft. The display may be visually enhanced as stall is approached such as by zooming the body angle of attack digital display and/or by changing the color of the display. The normalized display also selectively displays an approach reference band when the flap setting is equal to or greater than 20 degrees.