High-temperature vibration modal testing device for variable cross-section carbon fiber resin-based composites

A high-temperature vibration modal testing device for variable cross-section carbon fiber resin-based composites, comprising:

• a variable cross-section carbon fiber resin-based composite test piece, triangular serrated sliding rails, high-temperature steel sliding bayonets, a sliding furnace door, water-cooled conduits, a dual-axis sliding rail, an insulation box, an infrared radiation heating array, thin armored thermocouples, a tapping threaded rod, a tapping threaded fixture, a ceramic force transmission rod, an excitation source, a laser vibration measurer, a vibration measuring port, a mechanical pump, and an exhaust valve, wherein the sliding furnace door is connected to the dual-axis sliding rail in a sliding manner, and a center of the sliding furnace door is connected to the high-temperature steel sliding bayonets by fixing first steel bolts to horizontally fix the variable cross-section carbon fiber resin-based composite test piece;
• the dual-axis sliding rail transports and fixes the variable cross-section carbon fiber resin-based composite test piece to the tapping threaded fixture, the ceramic force transmission rod extends to an outer side of the insulation box and is connected to the excitation source, the infrared radiation heating array is mounted at a distance of 30 mm to 40 mm from an upper surface of the variable cross-section carbon fiber resin-based composite test piece, the thin armored thermocouples are mounted on an upper surface and a lower surface of the variable cross-section carbon fiber resin-based composite test piece and connected to a temperature recorder outside the insulation box, an inert gas is introduced into the insulation box through the mechanical pump and the exhaust valve inside the insulation box, the vibration measuring port is formed at a top of the insulation box, and laser from the laser vibration measurer penetrates the vibration measuring port and the infrared radiation heating array and projects the upper surface of the variable cross-section carbon fiber resin-based composite test piece to perform vibration high-temperature modal measurement on the variable cross-section carbon fiber resin-based composite test piece.