Vibration analysis characteristics of a pre-twisted tenon jointed blade with under-platform dampers in a thermal environment

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.

Automated summary

This study proposes a method to investigate 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. A friction model of the tenon and under-platform dampers contact interface is developed. The effects of natural frequency, temperature, rotational speed, and pre-twisted angle on blade vibration characteristics and nonlinear characteristics are analyzed while studying the coupling effect of multiple friction interfaces.