NDLI: Vibration response analysis caused by rubbing between rotating blade and casing

Content Provider	Springer Nature Link
Author	Ma, Hui Yin, Fanli Tai, Xingyu Wang, Di Wen, Bangchun
Copyright Year	2016
Abstract	Two types of blade-tip rubbing due to the static misalignment of the bladed-disk center and casing center and casing deformation are simulated. By applying aerodynamic load in the blade lateral/flexural direction, vibration responses due to blade-casing rubbing are analyzed under the run-up process with constant angular acceleration and the steady-state process at 10000 rev/min. The effects of some parameters, such as the static misalignment e $_{c}$, casing stiffness k $_{c}$ and casing deformation n $_{p}$, on the system vibration responses are also illustrated by spectrum cascades, time-domain waveforms of displacement, normal rubbing forces, amplitude spectra and the impulse P in a single blade-casing rubbing period. The results show that blade-tip rubbing will cause amplitude amplification and harmonic resonance phenomena when the multiple frequencies (nf $_{r}$) of rotational frequency (f $_{r}$) coincide with the first three flexural dynamic frequencies of the blade (f $_{n1}$, f $_{n2}$ and f $_{n3}$). For example, the displacement amplitudes at 3f $_{r}$, 14f $_{r}$ and 38f $_{r}$ are large and the vibration is dominant near f $_{n1}$. In addition, the casing deformation mainly excites the dominant Blade passing frequency (BPF), which is related to the casing deformation coefficient n $_{p}$. By comparing these impulse values, for the selected parameters in this paper, the casing stiffness has a greater effect on impulse than the static misalignment and casing deformation coefficient. The impulse shows a linear increase trend with the increasing static misalignment, and it decreases under the large n $_{p}$ because the contact time decreases with the increase of n $_{p}$.
Starting Page	1983
Ending Page	1995
Page Count	13
File Format	PDF
ISSN	1738494X
Journal	Journal of Mechanical Science and Technology
Volume Number	30
Issue Number	5
e-ISSN	19763824
Language	English
Publisher	Korean Society of Mechanical Engineers
Publisher Date	2016-05-27
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rotating blade Casing Rubbing Amplitude amplification Mechanical Engineering Vibration, Dynamical Systems, Control Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering

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