Strain Gauge Classification Device for Turbine Engine Testing
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Solution Overview
Problem
Current strain gauges used on turbine engine parts fail to withstand combined thermal and centrifugal stresses, leading to potential detachment during testing and loss of measurement, which increases the risk of turbine engine damage and test campaign disruptions.
Innovation Solution
A device that simulates operating conditions by rotating strain gauges and bonding materials within a temperature-controlled environment, using a holder connected to rotating means with cooling mechanisms to prevent overheating and mechanical stress, allowing for precise testing and certification of gauges and bonding materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are mounted on rotating turbine engine parts, then measurement capability is improved, but the gauges are subjected to thermal and centrifugal stresses that cause detachment and measurement loss
Solution Approach 1:
The patent applies preliminary action by conducting classification tests on strain gauges and bonding materials before actual turbine engine tests. The device subjects gauges to combined thermal and centrifugal stresses in advance to certify their resistance, ensuring they can withstand operating conditions. This preliminary certification prevents gauge detachment during actual tests, resolving the contradiction between measurement capability and reliability.
2Loss of information
If the number of strain gauges is increased to recover maximum information, then measurement information is improved, but the risks of gauge loss and turbine engine damage are multiplied
Solution Approach 1:
The patent applies preliminary action by classifying and certifying multiple strain gauges and bonding materials before deployment in turbine engine tests. By pre-testing gauges under combined thermal and centrifugal stresses, the system ensures that all gauges meet reliability standards before installation. This allows multiple gauges to be used simultaneously for maximum information recovery without proportionally increasing the risk of gauge loss and engine damage.
3Ease of manufacture
If empirical rules are used to dimension strain gauges, then manufacturing simplicity is improved, but the resistance to combined thermal and centrifugal stresses cannot be guaranteed
Solution Approach 1:
The patent applies parameter changes by transitioning from empirical dimensioning rules to a classification system based on actual test results under combined thermal and centrifugal stresses. The device enables systematic variation and testing of gauge dimensions, bonding materials, and mounting parameters to determine optimal configurations. This empirical approach to parameter optimization ensures reliable resistance to combined stresses while maintaining manufacturing feasibility through standardized classification categories.
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 device reduces the risk of turbine engine damage by ensuring strain gauges and bonding materials can withstand extreme conditions, providing reliable measurements and minimizing test disruptions through precise mechanical characteristic analysis.
Implementation Method 1
a temperature setting means capable of heating said holder and arranged about said holder
Implementation Method 2
said linking means comprising cooling means capable of limiting the heating of said rotating means
Implementation Method 3
said cooling means are arranged on either side of said temperature setting means so as to limit the propagation of heat by conduction to said rotation means
Implementation Method 4
said linking means comprises a means capable of enabling the expansion of said linking means under the effect of the increase in temperature of said linking means without placing under stress said rotating means
Data Source
AI summary
A device for classifying strain gauges includes a holder capable of receiving strain gauges and capable of being rotated by a rotating device, the holder being connected to the rotating device by a linking device; and a heater capable of heating the holder and arranged about the mounting, the linking device including a cooling device capable of limiting the heating of the rotating device.