Dynamic analysis of integrally shrouded group blades with rubbing and impact

Forced vibration responses of integrally shrouded group blades are investigated in this paper. A lumped mass model of integrally shrouded group blades considering centrifugal stiffening of the blade and rubbing and impact between adjacent shrouds is established. In the proposed model, collision forc...

Full description

Saved in:
Bibliographic Details
Published in:Nonlinear dynamics 2018-06, Vol.92 (4), p.2159-2175
Main Authors: He, Bingbing, Ouyang, Huajiang, He, Shangwen, Ren, Xingmin, Mei, Yonggang
Format: Article
Language:English
Subjects:
Algorithms
Approximation
Automotive Engineering
Blades
Classical Mechanics
Collision dynamics
Contact angle
Control
Dynamical Systems
Engineering
Flux density
Forced vibration
Mathematical models
Mechanical Engineering
Original Paper
Rubbing
Runge-Kutta method
Shrouds
Springs (elastic)
Stiffening
Stiffness
Vibration
Vibration analysis
Vibration control
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Forced vibration responses of integrally shrouded group blades are investigated in this paper. A lumped mass model of integrally shrouded group blades considering centrifugal stiffening of the blade and rubbing and impact between adjacent shrouds is established. In the proposed model, collision force is approximated by linear springs, and friction force is approximated by an exponential-type velocity-dependent model. Stick-slip-separation transition boundaries are determined. Runge–Kutta algorithm is used to compute vibration responses and study the effects of stiffness ratio, rotating speed and aerodynamic excitation amplitude on the vibration responses of integrally shrouded group blades. Vibration reduction effect of the shroud on the reference blade at the first dynamic resonance speed is illustrated. Numerical results indicate that stiffness ratio, initial gap and contact angle have a great effect on the normalised energy density (the value of which can represent vibration reduction effect of the shroud), and the reference blade can experience periodic, quasi-periodic and chaotic vibration due to nonsmooth behaviour at the shroud contact interfaces.
ISSN:0924-090X
1573-269X
DOI:10.1007/s11071-018-4187-0