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CSME 2019/04
Volume 40 No.2
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179-189
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Vibration and Friction Damping Analysis of Blades with Dovetail Attachment
Jiao Wanga, Tao Yua, Yue-hao Zhanga and Qing-kai Hanb
aSchool of Mechatronics and Automobile Engineering, Yantai University, Yantai264005, China
bSchool of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
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Abstract:
A theoretical method is presented to study the friction damping and contact characteristics of the blade with dovetail attachment. The vibration equation of a cantilever blade considering the friction damping is established, and the response of the blade is calculated by the Galerkin method. The spring and viscous damper are used to describe normal pressure in blade dovetail attachment structure. A cantilever blade is simplified based on natural frequency of the real blade test, and cantilever beam size is obtained. The effects of various parameters including normal contact stiffness, normal contact damping between contact faces of blade dovetail attachment, and rotating angular velocity on dynamic characteristics of blade are studied. The results show that friction damping of blade dovetail attachment can decrease resonance response of the blade. When the normal contact stiffness is maintained at 10⁷ N/m to 10⁸ N/m, damping effect is obvious.
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Keywords: compressor blade, friction damping, resonant response, normal contact stiffness, normal contact damping
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*Corresponding author; e-mail:
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©
2019
CSME , ISSN 0257-9731
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