Stability analysis of rotating blade bending vibration due to torsional excitation

Al‐Bedoor, B.O.; Al-Qaisia, A.A.

doi:10.1016/j.jsv.2004.03.038

Cited by 19 publications

(9 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For a certain turbine, the rotor gravity can be easyly calculated, however, the NECS excitation is hard to be obtained. The approach applied here is to equivalent the pressure (p) generated from the NECS on the blade surface into the torque (T) acting on the axis [6] (as shown in Fig.1(c)), and then, convert the torque (T) into the NECS excitation (F W (t)) by introducing the torque factors (α x =3.5 and α y =1.42) [7][8], the detailed deduction given as follows. The torque acting on the axis can be expressed as the resultant force moment of the y i direction forces of each blade (Eq.…”

Section: Calculation Modelsmentioning

confidence: 99%

Effects of the Wet Steam Non-Equilibrium Condensation on the Dynamics of the Excitation-Relying Bearing-Rotor system

2018

View full text Add to dashboard Cite

This paper investigated the effects of the wet steam non-equilibrium condensation on the dynamic characteristics of the bearing as well as the bearing-rotor system by constructing and analyzing a non-linear coupled model of the bearing-rotor system. An excitation-relying dynamic model of bearing is established based on the finite difference method, in which the excitation is converted from the pressure pulsation on the surface of rotor blades generated from the non-equilibrium condensation process. The Raccia transfer matrix method is implemented to analyse the dynamic behavior of this coupled system. Results show that the wet steam non-equilibrium condensation process would greatly reduce the bearing stiffness and damping and result in more intense vibration of the system, besides, its induced pulsed displacement would drive the excitation-relying bearing-rotor system more unstable.

show abstract

Section: Calculation Modelsmentioning

confidence: 99%

Effects of the Wet Steam Non-Equilibrium Condensation on the Dynamics of the Excitation-Relying Bearing-Rotor system

2018

View full text Add to dashboard Cite

show abstract

“…1 was used in this study. The equation of blade modal vibration can be written in the form (1) where opened and detailed forms of the factors are given by Al-Bedoor and Al-Qaisia [10].…”

Section: The Governing Equationmentioning

confidence: 99%

Stability Analysis of Rotating Blade Vibrations Using Lyapunov Exponents

Kunduracı¹

2018

El-Cezeri Fen Ve Mühendislik Dergisi

View full text Add to dashboard Cite

This paper presents an analysis of the vibration stability of a rotating blade due to shaft torsional vibration excitation. The governing equation adopted in the study is a Hill's type linear second order ordinary differential equation with multiple harmonically variable coefficient terms. The differential equation of the system is rewritten as two coupled first order ordinary differential equations. The stable and unstable regions are determined by the Lyapunov characteristics exponents on parameter space (grid) relating to the rotor speed, the torsional vibration excitation frequency and the blade natural frequency. The results are contrasted to those obtained by the strained parameter method (a perturbation technique), an excellent match is observed for small torsional vibration amplitudes .

show abstract

“…The author concludes that the lateral effect generated by the torsional load was a minimum, even when the rotor was operating near to its critical speeds. Using this methodology [5] studied the rotodynamic behavior in the torsional direction of a typical wing (elastic) installed in a flexible shaft. The modeling results and the simulation done in this work exhibited a strong dependency and an energetic interaction between the shaft torsional distortions and the wing's flexible distortions.…”

Section: Introductionmentioning

confidence: 99%

Study of the lateral vibration in a multistage rotor

Mendivelso-Duarte

Peña

Cruz-Guayacundo

2020

redin

View full text Add to dashboard Cite

This paper presents the development of theoretical and experimental models for the study of rotodynamic behavior of a multistage rotor. The transfer matrix method, which includes the characteristics of stiffness and damping for the supports and the stages respectively as well as the characteristics of unbalance in the stages, is used for the theoretical model. The data from a physical model was employed as a way of validating the theoretical results. The first two critical speeds were determined with the theoretical model and they differ in a low percentage with respect to the values measured experimentally. Moreover, the vibration level recorded in the physical model rises 2.5 times when the multistage rotor approaches the first two critical speeds. In addition to this, significant displacements of the lateral critical speeds are noticeable when an increase in mass imbalance is induced in several of the rotor impellers.

show abstract

Stability analysis of rotating blade bending vibration due to torsional excitation

Cited by 19 publications

References 11 publications

Effects of the Wet Steam Non-Equilibrium Condensation on the Dynamics of the Excitation-Relying Bearing-Rotor system

Effects of the Wet Steam Non-Equilibrium Condensation on the Dynamics of the Excitation-Relying Bearing-Rotor system

Stability Analysis of Rotating Blade Vibrations Using Lyapunov Exponents

Study of the lateral vibration in a multistage rotor

Contact Info

Product

Resources

About