In this paper, the implementation and validation of the proposed methods for optical fiber limit value calculation were investigated. The intersection distance method (IDM) and finite element drawing method (FEDM) were proposed and compared with the common similar triangle method (STM). The advantages and disadvantages of the three methods were analyzed from the aspects of accuracy, limitation and computing resources. The simulation results were verified by the fan rotor blade dynamic test. By comparing the calculated amplitude obtained by dynamic stress inversion with the measured amplitude, it is found that the calculated results of the three methods are in good agreement with the measured amplitude and could be used to estimate the amplitude under low stress condition. In torsional mode, the errors between the amplitude calculated by the STM, IDM, FEDM and the measured amplitude are 1.8%, 1.3% and 3.1% respectively. In high order mode, the amplitude difference obtained by each calculation method is up to 12%, and the errors between the amplitude by the FEDM and the measured amplitude is the lowest, reaching 0.3%. Furthermore, the errors of different calculation methods under stress higher than 200 MPa were analyzed. In conclusion, the results indicate that FEDM is the most accurate method for any vibration modes, and STM and IDM are also applicable in simplified calculation of low-order vibration modes of blades.
Calculation Method and Experimental Verification of Optical Fiber Limit Value of Aeroengine Rotor Blade
Lect. Notes Electrical Eng.
Asia-Pacific International Symposium on Aerospace Technology ; 2021 ; Korea (Republic of) November 15, 2021 - November 17, 2021
The Proceedings of the 2021 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2021), Volume 1 ; Kapitel : 71 ; 925-935
2022-08-31
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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