Dynamic Response Analysis of Blades with Damping Structures of Shroud and Snubber

DOI

10.2991/icismme-15.2015.55How to use a DOI?

Keywords

Friction Damping; Blade; Contact; Response

Abstract

A method is developed to analyze the influence of friction structural damping on the vibration characteristics of turbine blades. Vibratory responses of a long steam turbine blade with shroud and snubber are studied. Finite element contact analysis of the steam turbine blades modeled in 3-D solid elements is conducted to obtain the normal contact force on the shroud contact surface and snubber contact surface of adjacent blades under a serious of different rotational speeds. The stiffness matrix elements and damping matrix elements are built between dry friction contact surface to simulate the frictional characteristics on the contact surface of damper and blade. The results show that with increases in rotational speed, the resonance amplitude decreases first and then increases when there is only shroud contact. The effects are similar when there are both shroud and snubber contact. Under the certain conditions, the increasing of excitation force can also degrade stiffness and damping of shroud and snubber.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Guoping Li
AU  - Qiang Zhang
AU  - Wei Zhao
AU  - Qin Zhou
AU  - Yonghui Xie
PY  - 2015/07
DA  - 2015/07
TI  - Dynamic Response Analysis of Blades with Damping Structures of Shroud and Snubber
BT  - Proceedings of the First International Conference on Information Sciences, Machinery, Materials and Energy
PB  - Atlantis Press
SP  - 280
EP  - 283
SN  - 1951-6851
UR  - https://doi.org/10.2991/icismme-15.2015.55
DO  - 10.2991/icismme-15.2015.55
ID  - Li2015/07
ER  -