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Technical Briefs

Determination of Contact Stiffness of Rod-Fastened Rotors Based on Modal Test and Finite Element Analysis

[+] Author and Article Information
Yanchun Zhang, Zhaogang Du, Shaoquan Liu

Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China

Liming Shi

 Beijing Institute of Spacecraft System Engineering, Beijing 100094, China

J. Eng. Gas Turbines Power 132(9), 094501 (Jun 17, 2010) (4 pages) doi:10.1115/1.4000591 History: Received April 17, 2009; Revised September 22, 2009; Published June 17, 2010; Online June 17, 2010

A series of simplified rod-fastened rotors, which have different surface contact roughness are manufactured and their modal parameters under different pretightening force, are measured in free-free state. The concept of surface contact stiffness is introduced to simulate the influence of pretightening force on modal parameters of these simplified rod-fastened rotors using finite element method. The experiment measured results are compared and fitted to the finite element analysis results and the relationship between contact stiffness and contact stress is established in which the contact stress is defined by the pretightening force. The relationship is then applied on the modal analysis of a real gas turbine rotor, and its modal test results and finite element analysis results are consistent with each other, proving that the relationship and the described determination method of contact stiffness based on modal test and finite element analysis are effective.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Modal test rig of the simplified rod-fastened rotor

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Figure 2

Relationship of natural frequencies versus contact stresses

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Figure 3

Contacts between disks are modified by contact stiffness

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Figure 4

Calculated natural frequencies under different contact stiffness

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Figure 5

Relationship between contact stiffness and contact stress

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