Aerodynamic Surface Profile Analysis Device
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Solution Overview
Problem
Existing methods for analyzing the real form of aerodynamic surfaces on aircraft parts, such as engine air intakes, struggle to accurately identify and quantify differences between the real and theoretical forms, particularly in maintaining natural laminar flow. These methods often introduce noise and biases due to differences in geometric frames of reference and fail to account for complex undulation profiles.
Innovation Solution
A method and device for analyzing the profile of a real aerodynamic surface by adapting the geometric frame of reference to align leading and trailing edges with those of the theoretical form. This involves determining deviations, dividing them into subsections, and identifying maximal sinusoidal waves within each subsection. The analysis generates an alert message if wave amplitudes or gradients exceed manufacturing tolerance criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 3-D scanning tools are used to compare real and theoretical surface forms, then measurement capability is provided, but noise is introduced into the measurements which accentuates differences between real and theoretical forms
Solution Approach 1:
The patent extracts and isolates the harmful noise component from the measurement signal by using signal processing techniques. The analysis method separates the actual surface deviations from the noise introduced by scanning tools, allowing for accurate identification of real surface form differences without the contaminating effect of measurement noise.
Solution Approach 2:
The patent introduces an intermediary processing layer between the raw scanning data and the final analysis. By using mathematical models and signal filtering as intermediaries, the method transforms noisy measurement data into cleaned deviation profiles that accurately represent the real surface form differences.
2Productivity
If geometric frame of reference differences are not corrected, then analysis can be performed, but biases are introduced in the understanding of surface undulations
Solution Approach 1:
The patent performs preliminary alignment of the geometric frames of reference before conducting the surface form analysis. By pre-establishing the correct spatial relationship between scanning and theoretical models, the method eliminates biases in undulation detection without adding significant processing time to the overall analysis workflow.
3Device complexity
If complex undulation profiles are not considered, then analysis is simplified, but critical differences in wave geometry that affect laminar flow are missed
Solution Approach 1:
The patent segments the complex undulation profiles into individual wave components using Fourier analysis and signal processing. By breaking down complex surface deviations into discrete sinusoidal waves with identifiable amplitudes and wavelengths, the method enables systematic evaluation of each wave's impact on laminar flow while maintaining manageable analysis complexity.
Data Source
AI summary
A method and a device for analysis of a profile of a real form of a surface of a part. The device determines and divides into subsections a deviation between the real form and the theoretical form. Then, for each subsection, a sinusoidal wave characterized by an amplitude b and a half-length of wave a is identified. When b is smaller than a predetermined value bmin or when a is smaller than a predetermined value amin, then the device stops the analysis, otherwise a new iteration of the analysis is carried out, considering the sinusoidal wave identified as a new profile of a theoretical form of the surface. Upon completion of the analysis phase, an alert message is generated if the values b and/or b/a do not comply with a manufacturing tolerance criterion.