Founded in 1971 >
Chinese Sci-tech Core Periodicals >
British Science Abstracts (SA, INSPEC) Indexed Journals >
United States, Cambridge Scientific Abstract: Technology (CSA: T) Indexed Journals >
United States, Ulrich's Periodicals Directory(UPD)Indexed Journals >
United States, Cambridge Scientific Abstract: Natural Science (CSA: NS) Indexed Journals >
Poland ,Index of Copernicus(IC) Indexed Journals >
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
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: Long twisted blade was the core component of industrial steam turbine. Aiming at the problem that the contact stiffness and the vibration frequency of long twisted blade with damping structures could not be accurately predicted, a contact stiffness calculation method with stiffness correction coefficient was proposed. Firstly, the contact stiffness calculation formula was given based on Hertz contact and G-W model, the influence of main parameters on contact stiffness was analyzed, and the solution method of stiffness correction coefficient was determined. Then, the blade frequency test was carried out,and the experimental values of blade resonance speed was obtained. The static structure analysis of the blade was executed by ANSYS software, and the normal pressure of the contact surface was obtained. The blade modal analysis was carried out by using Matrix27 element to simulate the contact stiffness, and the stiffness correction coefficient was determined. Finally, the modal analysis of blade pitch diameter was carried out, and the first-order resonant speed of blade was obtained.The research results indicate that the error between the calculated value and the experimental value of the first-order resonant speed of the blade based on this method is less than 5%;after considering the influence of the thickness of blade shroud on the calculation accuracy, the shroud is thinned by 7mm,the error between the calculated value and the experimental value of the first-order resonant speed of the blade is less than 1%;it proves that the proposed method can accurately predict the vibration frequency of long twisted blades with damping structures, its accuracy meets the requirements, and it has good engineering application value.
Key words: steam turbine; thickness of blade shroud; blade frequency test; contact stiffness calculation method; stiffness correction coefficient; static structure analysis
-
- Chinese Core Periodicals
-
- Chinese Sci-tech Core Periodicals
-
- SA, INSPEC Indexed
-
- CSA: T Indexed
-
- UPD:Indexed
-
Copyright 2010 Zhejiang Information Institute of Mechinery Industry All Rights Reserved
Technical Support：Hangzhou Bory science and technology
