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Vibration analysis of a pretwisted rotating blade with a concentrated mass

집중질량과 초기 비틀림각을 갖는 회전블레이드의 진동해석

Kwak, Joo-Young;Yoo, Hong-Hee
곽주영;유홍희

  • Published : 1998.01.01

Abstract

Equations of motions of a pretwisted rotating blade with a concentrated mass in an arbitrary position are derived. The flapwise and chordwise equations are coupled to each other due to the pretwist angle of the blade. As the angular speed, hub radius ratio, pretwist angle and concentrated mass vary, the vibration characteristics of the blade change. It is found that eigenvalue lociveering phenomena occur between two closing loci due to the pretwist angle. The effect of the pretwist angle on the critical angular speed and location of the concentrated mass on the natural frequencies are also investigated.

Keywords

Vibration Analysis;Pretwisted;Rotating Blade;Concentrated Mass;Natural Frequency Loci Veering;Mode Shape Variations