Laser triangulation measurement of blade oscillation in a transonic compressor cascade

0573642 - ÚT 2024 RIV GB eng C - Conference Paper (international conference)
Šidlof, P. - Šidlof, P. - Štěpán, M. - Šimurda, David - Lepičovský, Jan
Laser triangulation measurement of blade oscillation in a transonic compressor cascade.
Journal of Physics: Conference Series. Vol. 2511. Bristol: IOP Science, 2023, č. článku 012010. ISSN 1742-6588. E-ISSN 1742-6596.
[Biennial Symposium on Measuring Techniques in Turbomachinery (MTT) /26./. Pisa, ITALY (IT), 28.09.2022-30.09.2022]
R&D Projects: GA MŠMT(CZ) LTAUSA19036
Institutional support: RVO:61388998
Keywords : laser triangulation * deflection measurement * compressor blade cascade * flutter
OECD category: Applied mechanics
https://iopscience.iop.org/article/10.1088/1742-6596/2511/1/012010/pdf

The paper describes a method for optical measurement of oscillation of blades in a linear cascade designed for flutter research. The method uses laser triangulation, which measures the distance between the sensor and the oscillation object. The distance can be recalculated to angular displacement of the blade. However, the relation is nonlinear due to the curvature of the blade. The nonlinear dependence between the distance and angular displacement is derived and quantified analytically. The paper further analyzes the influence of light refraction in the optical window, surface quality and sensor inclination. A procedure for the nonlinear calibration is proposed and used during wind tunnel measurements in a blade cascade with forced oscillation of the middle blade.
Permanent Link: https://hdl.handle.net/11104/0344080