https://orcid.org/0000-0001-6335-5608
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Abstract
This study proposes a method to study blades with multiple friction interfaces, to reveal the coupling effect of multi-interface blades on nonlinear vibrations. The dynamics of a pre-twisted tenon jointed blade with under-platform dampers in a thermal environment is modeled, considering the combined effects of thermal effects and nonlinear loads. Subsequently, a friction model of the tenon and under-platform dampers contact interface is developed. While studying the coupling effect of multiple friction interface, the effects of natural frequency, temperature, rotational speed and pre-twisted angle on blade vibration characteristics and nonlinear characteristics are analyzed.
Disclosure statement
The authors declare that there is no conflict of interests regarding the publication of this article.
Figure 1. Schematic diagram of damped pre-twisted tenon joint blade with the platform in a thermal environment.
Figure 2. Tenon friction model.
Figure 3. Damping friction model under the platform.
Figure 4. Material parameter – temperature curve.
Figure 5. Amplitude-frequency response.
Figure 6. Frequency curve.
Figure 7. Time domain response of blades at different temperatures.
Figure 8. Amplitude-frequency response of blade vibration at 100 rad/s.
Figure 9. Amplitude-frequency response of blade vibration at different rotational speeds.
Figure 10. Time domain response of circumferential vibration of blades.
Figure 11. Time domain response of blade chord vibration.
Figure 12. Amplitude-frequency response of circumferential vibration of blades.
Figure 13. The amplitude-frequency response of the chord vibration of a blade.
Figure 14. Time domain response of circumferential vibration.
Figure 15. Time domain response of chord vibration.
