Aircraft Support Stiffness Calibration via Reaction Force Comparison
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Solution Overview
Problem
Calibrating the stiffness of support structures in aircraft shoring is challenging due to uncertainties in manufacturing parameters and non-linear reactions, making it difficult to predict and measure support loads accurately, which can lead to costly repairs and stress generation.
Innovation Solution
A method involving modeling the assembly using finite elements under moderate support load conditions, calculating and measuring reaction forces, and calibrating stiffness by comparing calculated and measured forces, allowing for reliable stiffness determination and validation under critical load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If support structures are made stiffer to reduce deformation under load, then load-bearing capacity is improved, but manufacturing complexity and cost increase due to precision requirements and assembly difficulties
Solution Approach 1:
The support structure is divided into multiple modular components (support head, support body, adjustment mechanism) that can be manufactured separately with standard tolerances and assembled. This segmentation allows each component to be optimized independently, reducing overall manufacturing complexity while maintaining structural integrity and load-bearing capacity.
Solution Approach 2:
The support structure incorporates an adjustment mechanism that allows dynamic modification of support height and positioning. This dynamic capability enables the structure to adapt to different loading conditions and assembly requirements, reducing the need for multiple fixed-configuration support structures and simplifying manufacturing by using a single adaptable design.
2Stress or pressure
If more support structures are added to distribute loads, then stress on individual structures is reduced, but assembly complexity and time increase
Solution Approach 1:
The support structure is designed as a universal, multi-functional component that can be used in various positions and configurations within the aircraft assembly. The standardized design allows the same support structure type to handle different loading scenarios, reducing the total number of unique support components needed and simplifying assembly procedures while maintaining effective load distribution.
3Measurement precision
If strain gauges are installed to measure stress accurately, then measurement precision is improved, but device complexity and calibration requirements increase
Solution Approach 1:
The support structure incorporates built-in sensors and measurement capabilities that automatically monitor and report stress, position, and loading conditions without requiring external calibration equipment or complex setup. The self-diagnostic features and automated calibration routines reduce the need for manual intervention and specialized calibration procedures, maintaining measurement precision while simplifying the overall system.
Data Source
AI summary
A method of calibrating stiffness of support structures of an assembly including a main structure and support structures includes modeling the assembly using finite elements, with a theoretical stiffness of the support structures, in moderate support load conditions, calculating calculated reaction forces for each support structure and measuring corresponding measured reaction forces. The stiffness of each support structure is calibrated by determining a calculated stiffness of each support structure based on comparison between the calculated reaction forces and the measured reaction forces. The modeling and simple measurements during an operational phase, in which the support loads are moderate, thus enable the calibration of the stiffness of the support structures. An associated method of modeling the assembly and a corresponding computer program are also disclosed.