Impact Bedding for Thermal Stability in Solid Testing
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Solution Overview
Problem
Existing methods for non-destructive testing of solids using impact excitation techniques face challenges in maintaining accuracy at varying temperatures due to worsening signal-to-noise ratios and thermal expansions, which affect the support system's stability and measurement precision.
Innovation Solution
A temperature-controlled impact excitation measurement system with a thermally stable support system and a ballistic impactor that provides impacts from below, using a sensor system capable of registering vibrational responses, and a bedding with high elasticity to minimize thermal expansion effects and ensure accurate measurements across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional support system is used for impact excitation measurements, then the test piece can be positioned for vibration analysis, but thermal expansion at varying temperatures causes instability and reduces measurement precision
Solution Approach 1:
The patent applies parameter changes by selecting a bedding material with specific elastic properties (Young's modulus) that remain stable across the temperature range of interest. The bedding's elasticity parameter is chosen to be substantially larger than that of the test piece, ensuring that the support system's mechanical properties do not significantly change with temperature, thereby maintaining measurement precision and stability simultaneously
Solution Approach 2:
The patent directly addresses thermal expansion effects by using a bedding material whose thermal expansion characteristics are optimized to minimize dimensional changes over the operating temperature range. The bedding is designed to compensate for or resist thermal expansion, maintaining the test piece's position stability and preventing measurement errors that would otherwise occur due to temperature-induced dimensional changes
2Stability of the object's composition
If the bedding elasticity is increased to minimize thermal expansion effects, then measurement stability improves, but the support system becomes more rigid and may interfere with natural vibrations
Solution Approach 1:
The patent applies local quality by creating a differentiated support system where the bedding has high elasticity at the contact points with the test piece to minimize thermal expansion effects, while the overall support structure maintains appropriate compliance. This localized optimization allows the bedding to be rigid where needed for stability without making the entire support system overly rigid, thus avoiding interference with natural vibrations
Solution Approach 2:
The patent carefully selects and adjusts the elasticity parameter (Young's modulus) of the bedding material to achieve an optimal balance. By changing this physical parameter to be substantially larger than the test piece's elasticity, the bedding provides sufficient stability to resist thermal expansion while still allowing the test piece to vibrate naturally during impact excitation measurements
3Adaptability or versatility
If impact excitation is performed at high temperatures, then material properties can be characterized under operating conditions, but signal-to-noise ratio deteriorates reducing measurement accuracy
Solution Approach 1:
The patent applies parameter changes by optimizing the bedding's elastic properties and the impact excitation parameters specifically for high-temperature measurements. The bedding material is selected to maintain its mechanical properties at elevated temperatures, and the impact force parameters are adjusted to generate sufficient vibration signals that exceed the thermal noise background, thereby maintaining measurement precision across the extended temperature range
Solution Approach 2:
The patent converts the harmful effect of thermal noise at high temperatures into a manageable parameter by using the bedding's high elasticity to isolate the test piece from environmental vibrations and thermal fluctuations. The rigid bedding acts as a stable reference frame that filters out low-frequency thermal noise, allowing the measurement system to focus on and detect the high-frequency vibration signals generated by impact excitation, thus improving signal-to-noise ratio despite high-temperature conditions
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 achieves improved accuracy and precision in measuring material properties by stabilizing the test piece and reducing noise interference, allowing for reliable characterization of solids at temperatures from -50°C to 1600°C.
Implementation Method 1
an impactor configured to, at any testing temperature within a testing temperature range of between 0° C. and 1600° C., impart an impact from below to a test piece
Implementation Method 2
a sensor system configured to obtain a vibrational response of the test piece to the impact provided to the test piece by the impactor
Data Source
AI summary
An impact excitation measurement system includes a temperature controlled testing chamber, an impactor, a sensor system and a support system. The impactor is configured to, at any testing temperature within a testing temperature range of between 0° C. and 1600° C. The sensor system is configured to obtain a vibrational response of the test piece to the impact provided to the test piece by the impactor. The support system includes a bedding for supporting a solid test piece within the testing chamber. The bedding has an elasticity which is substantially larger than the elasticity of the test piece. The impactor is configured to provide the impact to the test piece at an impact height. The bedding is configured to support the test piece at a support height which differs from the impact height for at most 0.5 mm at any testing temperature within the testing temperature range.