High-Temperature Vibration Testing for Carbon Fiber Composites
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Solution Overview
Problem
Existing high-temperature vibration modal testing devices are inadequate for carbon fiber resin-based composites, as they cannot simulate environments above 1000°C and safely obtain high-temperature modal parameters without damaging the composite structures.
Innovation Solution
A high-temperature vibration modal testing device is designed to create a thermal vibration environment above 1000°C for variable cross-section carbon fiber resin-based composites, using an infrared radiation heating array and a ceramic force transmission rod to apply random vibration, while a laser vibration measurer and protective gas environment ensure safe and accurate testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional acceleration sensors are attached to the surface of carbon fiber resin-based composites to obtain dynamic vibration signals, then vibration signals can be obtained, but the sensors cannot withstand temperatures above 650°C and fail in high-temperature environments above 1000°C
Solution Approach 1:
The patent replaces conventional contact-based acceleration sensors with a non-contact laser vibration measurement system. The laser vibrometer measures surface vibration by detecting light reflection from the test piece surface, eliminating the need for temperature-sensitive contact sensors and enabling measurement in environments above 1000°C
Solution Approach 2:
The patent introduces laser light as an intermediary medium to transfer vibration information from the high-temperature test piece to the measurement system. The laser beam reflects off the vibrating surface, carrying vibration data without requiring physical contact between the sensor and the hot test piece
2Temperature
If carbon fiber resin-based composites are heated at high temperatures above 1000°C, then high-temperature modal testing can be conducted, but the resin decomposes to produce harmful gases that impact the experimental environment and personnel safety
Solution Approach 1:
The patent uses an inert gas atmosphere (such as nitrogen or argon) in the testing chamber to prevent resin decomposition and harmful gas generation. The inert gas displaces oxygen, eliminating combustion and decomposition reactions even at temperatures above 1000°C, ensuring safe testing conditions
Solution Approach 2:
The patent converts the potential harm of resin decomposition into a benefit by using controlled atmospheric conditions. Instead of allowing harmful gas generation, the system uses inert gas protection to prevent decomposition, turning a dangerous high-temperature environment into a safe testing condition while maintaining the necessary thermal environment for modal testing
3Adaptability or versatility
If existing high-temperature vibration modal devices are used for carbon fiber resin-based composites, then some modal testing can be conducted, but they cannot simulate environments above 1000°C and obtain high-temperature modal parameters
Solution Approach 1:
The patent changes the operating temperature parameter of the testing system by using specialized high-temperature components including inert gas protection, laser-based non-contact measurement, and high-temperature resistant fixtures. These parameter changes enable the system to operate reliably above 1000°C and accurately measure modal parameters in this extreme temperature range
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 effectively simulates extreme flight environments, allowing for the safe and accurate measurement of high-temperature vibration modal parameters of carbon fiber resin-based composites, thereby guiding the design and stability assessment of these composite structures in aerospace applications.
Implementation Method 1
infrared radiation heating array
Implementation Method 2
laser vibration measurer
Data Source
AI summary
A high-temperature vibration modal testing device for variable cross-section carbon fiber resin-based composites includes triangular serrated sliding rails, high-temperature steel sliding bayonets, sliding furnace door, water-cooled conduits, dual-axis sliding rail, insulation box, infrared radiation heating array, thin armored thermocouples, observation port, tapping threaded rod, tapping threaded fixture, ceramic force transmission rod, excitation source, laser vibration measurer, vibration measuring port, mechanical pump, and exhaust valve. A variable cross-section carbon fiber resin-based composite test piece is fixed to the high-temperature steel sliding bayonets and fixed to the tapping threaded fixture by the dual-axis sliding rail. During high-temperature vibration modal testing, the infrared radiation heating array provides a high-temperature thermal environment, the excitation source connected to the tapping threaded fixture provides random vibration, and thermal model measurement is performed through the laser vibration measurer. The device can perform high-temperature vibration modal testing on variable cross-section carbon fiber resin-based composites in aerospace flight environments.