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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
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310009
E-mail:
meem_contribute@163.com
Abstract: The bladedisc structure (the integral blade disc structure) is the key structure in the impeller machinery. Aiming at the problems of blade mass detuning and vibration localization caused by uneven blade mass distribution in the integral blade disk, the vibration response characteristics of the detuning integral blade disk were studied. Firstly, the lumped mass analysis method was used to establish the physical model of the integral blade disk, deduced the response equation containing the mass detuning of a single blade, and drawn the amplitude frequency characteristic curves under different disc parameters. Then, the threedimensional finite element model of integral blade disk with different blade thickness was established by using the finite element analysis method. The vibration response characteristics were analyzed by ANSYS, and the amplitude frequency characteristic diagram of the overall blade disk with blade mass detuning was drawn. Finally, the amplitude frequency characteristic curves of detuning integral blade disc obtained by two different analysis methods were compared, and the influence law of various parameters on the vibration characteristics of the system was summarized.The results show that the mass detuning of a single blade will make the peak response of the system surge from 2.7mm to 3.5mm, and there are redundant peaks. Under the condition of low coupling, the excitation frequency of the system varies more widely, about 550Hz~650Hz. By revealing the vibration response law of detuning integral blade disk, it can better guide the design and transformation of turbomachinery.
Key words: impeller machinery; blademass detuning; integral blade disc structure; vibration response characteristics; amplitude frequency characteristic; lumped mass analysis; finite element model
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