2007•Jixie qiangduRequires access

NUMERICAL MODEL AND OPTIMIZATION FOR DYNAMIC CHARACTERISTIC OF LONG BLADE WITH FRICTION DAMPER

Xie Yong

Abstract

Adding damped structure can decrease dynamic stress of blade and avoid blade fatigue failure from forced vibration.Based on the structural feature of long blade with friction damper,pretwist beam element and space straight beam element were adopted to discrete the blade,and the numerical model of damper link element was established,then the gross finite element motion equation of the blade was obtained.The response of a last stage long blade with different thickness shroud and gap between shrouds was investigated in detail,then the optimal structure of damped shroud was obtained,the comparison for response between damped blade and freestanding blade shows the maximum response of blade with optimal damper is 42.4% of that of freestanding blade.At last,the tie wire was added to the damped blade,numerical result shows it can decrease blade response further.Dynamic characteristic of various dampers of blades can be analyzed by the numerical model,and it may be usable for optimization of damped blade.

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Available abstract

Key concepts: Blade (archaeology), Damper, Shroud, Structural engineering, Vibration, Finite element method, Blade element momentum theory, Beam (structure)