Dynamic Characteristics of a Rotating Blade with a Dovetail Fixture

Author:

Fan Xiaoyu1,Liang Wenchao2,Zeng Jin234,Yang Yang24,Ma Hui5,Fan Chenguang2,Fu Shunguo6

Affiliation:

1. Aero Engine Corporation of China, Beijing 100097, China

2. School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 610031, China

3. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China

4. Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education, Northeastern University, Shenyang 110819, China

5. School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China

6. AECC Sichuan Gas Turbine Establishment, Mianyang 621000, China

Abstract

Considering rotation-induced centrifugal stiffening, spin softening, and Coriolis effects, the reduced dynamic model of a rotating blade with a dovetail fixture is established in the ANSYS environment via the fixed-interface method for higher computational efficiency and lower memory consumption. Then some parameters such as rotating speed, friction factor, and stator blade number affecting the nonlinear vibration responses of the system under the combined actions of aerodynamic force, centrifugal force, and gravity are elaborately discussed. The results show that: (1) the contact-induced nonlinearity between the tenon and the mortise mainly results in the frequency multiplications of the aerodynamic excitation frequency; (2) a larger friction factor results in a lower magnitude of contact pressure and a higher resonance frequency, while a larger stator blade number results in a lower magnitude of the uniform and continuous contact pressure distribution; (3) the excitation of the resonant mode caused by the aerodynamic force is primarily characterized by the first-order bending mode of the system.

Funder

National Natural Science Foundation

Natural Science Foundation of Sichuan Province

Opening Project of Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province

Key Laboratory of Vibration and Control of Aero-Propulsion System, Ministry of Education, Northeastern University of China

Fundamental Research Funds for the Central Universities

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Industrial and Manufacturing Engineering,Control and Optimization,Mechanical Engineering,Computer Science (miscellaneous),Control and Systems Engineering

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