Stressroll Load Cell Wheatstone Bridge for Off-Axis Force Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aircraft wheel stressrolling processes face inaccuracies in force measurement due to off-axis loads caused by the application of compressive stress, leading to potential wheel cracking and reduced reliability.
Innovation Solution
A stress load measurement system comprising two load cells configured as halves of a Wheatstone bridge, with strain gauges oriented orthogonally on each arm to sense and balance off-axis loads, ensuring accurate measurement of compressive forces applied during the stressrolling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single load cell is used to measure force during stressrolling, then the device complexity is low, but the measurement precision deteriorates due to off-axis loads causing deflection and deformation
Solution Approach 1:
The measurement system is divided into multiple independent load cells (at least two) positioned at different locations on the stressrolling apparatus. Each load cell measures force independently, and their readings are combined to calculate the total applied force, thereby compensating for off-axis load effects and improving measurement accuracy
Solution Approach 2:
Multiple load cell measurements are merged and combined through computational algorithms to produce a single accurate measurement of the total compressive force applied to the wheel. The force measurements from multiple load cells are integrated to cancel out errors caused by off-axis loading
2Measurement precision
If strain gauges are oriented in a single direction on load cell arms, then the device complexity is low, but the measurement precision deteriorates due to inability to sense off-axis loads
Solution Approach 1:
Strain gauges are arranged in asymmetric patterns on the load cell arms, with gauges positioned at different orientations (e.g., 0 degrees and 45 degrees). This asymmetric arrangement allows the measurement system to detect and differentiate between axial and off-axis loads, improving measurement accuracy
Solution Approach 2:
The measurement capability is extended from a single dimension (axial load only) to multiple dimensions by adding strain gauges at different angular orientations. This multi-dimensional strain gauge arrangement enables the system to sense loads in multiple directions and computationally separate the axial component from off-axis components
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
The system effectively cancels off-axis loads, providing precise measurement of forces applied to the aircraft wheel, enhancing the reliability and longevity of the wheel by ensuring accurate compressive force application.
Implementation Method 1
The first load cell may include a first strain gauge and a second strain gauge mounted to a first arm of the first bracket, and a third strain gauge and a fourth strain gauge mounted to a second arm of the first bracket
Implementation Method 2
The first load cell may form a first half of a Wheatstone bridge and the second load cell may form a second half of the Wheatstone bridge
Data Source
AI summary
A stressroll assembly may comprise a first bracket comprising a first load cell. The first load cell may form a first half of a Wheatstone bridge. A first stressroll wheel may be mounted to a first axle extending between a first arm of the first bracket and a second arm of the first bracket. A second bracket may comprise a second load cell. The second load cell may form a second half of the Wheatstone bridge. A second stressroll wheel may be mounted to a second axle extending between a first arm of the second bracket and a second arm of the second bracket.