ROTATING BLADE NON-CONTACT DYNAMIC STRAIN FIELD MEASUREMENT METHOD AND SYSTEM

摘要

Disclosed are a rotating blade non-contact dynamic strain field measurement method and system, the method comprising the following steps: establishing a three-dimensional finite element model of a rotating blade to be measured, and extracting modal parameters of the three-dimensional finite element model; determining the number and axial mounting positions of blade tip timing sensors; constructing a conversion matrix for finite measurement point displacement and overall strain field; obtaining rotating blade tip finite position displacement on the basis of the blade tip timing sensors, wherein the dynamic strain of the rotating blade at any moment, in any position and on any direction is obtained on the basis of conversion matrix modal processing. The method only uses blade tip finite measurement point displacement to implement rotating blade overall strain field reconstruction, and implements both blade surface dynamic strain measurement and blade internal node normal strain and shear strain measurement. The method has simple calculation processes and high measurement accuracy, and facilitates in-line measurement.