Stability Analysis of a Cracked Blade Coupled with a Rigid Rotor

2018 ◽  
pp. 178-192
Author(s):  
Bruno R. F. Rende ◽  
Izabela B. da Silva ◽  
Tobias S. Morais ◽  
Aldemir Ap. Cavalini ◽  
Valder Steffen
Keyword(s):  
Stability Analysis ◽  
Rigid Rotor

Non-Linear Transient Stability Analysis of a Rigid Rotor Supported on Journal Bearings With Rectangular Dimples

2015 ◽  
Author(s):  
Ram Turaga
Keyword(s):  
Stability Analysis ◽  
Surface Texture ◽  
Transient Stability ◽  
Equations Of Motion ◽  
Journal Bearings ◽  
Pressure Curve ◽  
Rigid Rotor ◽  
Non Linear ◽  
The Stability ◽  
Transient Stability Analysis

The influence of deterministic surface texture on the sub-synchronous whirl stability of a rigid rotor has been studied. Non-linear transient stability analysis has been performed to study the stability of a rigid rotor supported on two symmetric journal bearings with a rectangular dimple of large aspect ratio. The surface texture parameters considered are dimple depth to minimum film thickness ratio and the location of the dimple on the bearing surface. Journal bearings of different Length to diameter ratios have been studied. The governing Reynolds equation for finite journal bearings with incompressible fluid has been solved using the Finite Element Method under isothermal conditions. The trajectories of the journal center have been obtained by solving the equations of motion of the journal center by the fourth-order Runge-Kutta method. When the dimple is located in the raising part of the pressure curve the positive rectangular dimple is seen to decrease the stability whereas the negative rectangular dimple is seen to improve the stability of the rigid rotor.

Parametric Study of the Imbalance Response of a Squeeze Film Damper

2008 ◽  
Author(s):  
Changhu Xing ◽  
Minel J. Braun ◽  
Hongmin Li
Keyword(s):  
Numerical Simulation ◽  
Stability Analysis ◽  
Direct Numerical Simulation ◽  
Parametric Study ◽  
Squeeze Film ◽  
Rigid Rotor ◽  
Squeeze Film Damper ◽  
Rotor Bearing ◽  
Parametric Studies ◽  
Spring Support

Rigid rotor models are widely used for the rotor-bearing stability analysis. This paper presents parametric studies for a squeeze film damper (SFD) using as parameters pressurization, the retainer spring support, and viscosity under the 2π- and π-film assumptions. The results are then validated by direct numerical simulation of the journal orbit.

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