Optimization of frequency response data for elongated blades of axial fans

The aim of the research is to prevent the air flow–blade resonance by changing geometry and physical and mechanical characteristics of axial fan blades. High-speed axial fan blades have a high height length/chord length ratio. The blades are currently made of polymeric composites. Due to some physical and mechanical properties of composites, free frequencies of blades can coincide with disturbance frequencies induced by air flow. Periodic deformations of blades also change the structure of air flow, and self-excited oscillations appear as a result. Resonance or close-to-resonance mode can induce damage of blades. The theoretical research shows that resonance appears from the inertia forces during engine acceleration. The major loads on the blade in the period of engine acceleration are considered, the analytical dependences of the blade deformation on the blade loads and geometry is obtained, and the formulas are derived for frequency and probable amplitude of oscillations of the inertia flutter. The equation of the blade vibration frequency takes into account the physical and mechanical, and geometrical characteristics of blades. The frequency of the external disturbances is assumed as the impeller rotation frequency and its harmonic. The equation shows how to change the material and sizes of the blade to avoid resonance.

 

Acknowledgements:
For citation:

Tauger V. M., Materov A. Yu., Makarov V. N., Makarov N. V., Ugol`nikov A. V. Optimization of frequency response data for elongated blades of axial fans. MIAB. Mining Inf. Anal. Bull. 2019;(11):131-138. [In Russ]. DOI: 10.25018/0236-1493-2019-11-0-131-138.

 

Issue number: 11
Year: 2019
Page number: 131-138
ISBN: 0236-1493
UDK: 621.44
DOI: 10.25018/0236-1493-2019-11-0-131-138
Authors: Tauger V. M., Materov A. Yu., Makarov V. N., etc.
About authors:

V.M. Tauger1, Cand. Sci. (Eng.), Head of Chair,
e-mail: tauger53@mail.ru,
A.Yu. Matherov, Head of the Group, NPK OilGazMash LLC,
Podolsk, Russia,
V.N. Makarov1, Dr. Sci. (Eng.), Professor,
N.V. Makarov1, Cand. Sci. (Eng.), Head of Chair,
e-mail: mnikolay84@mail.ru,
A.V. Ugol'nikov1, Cand. Sci. (Eng.), Head of Chair,
1 Ural State Mining University, 620144, Ekaterinburg, Russia.

Keywords: Axial fan, blade, composite, deformation, vibration, disturbance, air flow, resonance.
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