Research on heat dissipation law of blade forced vibration based on infrared thermography

DOI:	10.11809/bqzbgcxb2023.10.001
Keywords:	aero engine blades; forced vibration; infrared thermography; ultrasonic stimulation; thermal variables measurement
Abstract:	The fatigue process involves the heat dissipation effect, and the temperature change caused by the heat dissipation can reflect the fatigue damage process. In order to study the fatigue problem of aero engine blades, the study of the heat dissipation law of blade forced vibration based on the infrared thermal image method is proposed.Firstly, the fatigue heat dissipation theory is systematically examined. Then, the modal analysis of the flat plate and blade structure is performed to obtain the vibration pattern and stress distribution of each order, analyze the vibration characteristics, and identify weak areas. Finally, the heat dissipation law of the flat plate and blade structure during forced vibration with ultrasonic excitation is investigated using infrared thermography. The results show that the high order mode of the blade structure is primarily bending or torsion based composite vibration, and the stress concentration frequently occurs in the middle of the leaf root and the leaf body. The mass, damping effect, and vibration time are the main influences on the specimen’s maximum temperature rise value and surface temperature rise rate, respectively, and infrared thermography can be used as an effective technical means for rapid detection of the stress concentration area under the forced vibration of the structure, which provides a new idea for the non contact study of blade structure vibration fatigue.
Issue:	Vol. 44 No. 10 (2023)
Published:	2023-10-28
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