The Rotating Rectangular Thin Plate's Dynamic Stress Experiment (Single Point's Frequency Research)

• Main Author: Xixin JIANG
• Format: Article
• Language: English
• Published: IFSA Publishing, S.L. 2013-06-01
• Series: Sensors & Transducers
• Subjects: Rotating blade; FBG; Dynamic strain; Non-contact; Strain.
• Online Access: http://www.sensorsportal.com/HTML/DIGEST/june_2013/P_1242.pdf

Utilizing optical Fiber Bragg Grating's (FBG) characteristic of transmission optic signals in non-contact way, the measure method of the twisted, variable cross-section, variable thickness, rotating rectangular blade's local strain has been presented. Firstly, by using the finite element method to obtain the rotating blade's natural frequency, modal shape and strain modal shape, the mounting location of the FBG on the rotating blade is determined; secondly, using optical fiber non-contact transmission device, the rotating blade's dynamic strain in different locations can be measured by FBG. In this paper, the author only analyzed the frequency, amplitude and the dynamic stiffening phenomenon of dynamic strain at one point in rotating state. Finally, the author points out that this method can effectively measure rotating blade's dynamic strain and dynamic response, by result analysis, rotatating blade worth further researching.