effect of an unbalanced rotor on dynamic

In this paper the non-linear dynamic analysis of an unbalanced rotor supported by roller bearings has been made The non-linearity in the rotor bearing system is due to Hertzian contact unbalanced rotor effect and radial internal clearance The system can excite bi Dynamic response of an unbalanced rotor supported on ball bearings He conducted Experiments to investigate the effect of radial internal clearance and the unbalance force on the dynamic response of a horizontal rotor N Tandon et al [8]

Gyroscopic effects Rotating machine unbalance IJSER

gyroscopic moment acting on the rotor becomes critical It can be analyzed to improve the design and decrease the possibility of failure This paper focuses on dynamic unbalance detection in rotating machinery by incorporating whirl gyroscopic effects

It is essential to deal with dynamic stability at ultra-high speeds Unbalance response analysis is performed by calculating the unbalance with and without balancing by a balancing machine The balanced rotor is better than the unbalanced rotor in terms of the

The dynamic behaviour of an imbalanced and warped Jeffcott rotor with asymmetric stiffness was studied theoretically and experimentally The rotor response was analyzed and discussed under different rotating speeds and angle ranges between the directions of the bend and imbalance

This is because as the rotor bends or deflects the weight of the rotor is moved out away from the rotating centerline creating a new unbalanced condition known as whip This new unbalance can be corrected by re-balancing in the two end planes however the rotor would then be out of balance at slower speeds where there is no deflection

Given a rotor operating in free space without bearings or any support system the expected vibration velocity for this rotor balanced to grade G-2 5 is approximately 0 1 in /sec Each balance quality grade refers to the expected vibration velocity in free space measured in in /sec

Study of Effect of Unbalanced Forces for High Speed Rotor

paper the authors' main intense is to study the effect of unbalance force on the dynamic behavior of the unbalanced rotor system Harsha [1] is the first who has study the effect of unbalanced forces for cylindrical rolling element bearing which has 8 no of roller

To study the effect of the SFD on the dynamic behavior of the rotor system with bearing fault the SFD is mounted on one of the two bearings at a time The spectral diagrams of the faulted system with the SFD mounted on the normal bearing at the speed of 100 rad/s 150 rad/s are shown in Figures 12 and 13

Balancing and Its Effects on Vibration Response By Victor Wowk P E If I ever came across a perfectly balanced rotor I would: 1 Think that I died and went to heaven and 2 Not know it because perfect balance is unmeasurable since it does not create any

A dynamic model of a double-disk rub-impact rotor-bearing system with rubbing fault is established The dynamic differential equation of the system is solved by combining the numerical integration method with MATLAB And the influence of rotor speed disc eccentricity and stator stiffness on the response of the rotor-bearing system is analyzed In the rotor system the time history diagram

Nonlinear Dynamic Response of an Unbalanced Flexible Rotor Supported by Elastic Bearings Lubricated with Piezo-Viscous Polar Fluids Mustapha Lahmar 1 and Benyebka Bou-Sad 2 * 1 Dpartement de Gnie Mcanique Laboratoire de Mcanique et

The heavy side of the rotor will swing to the bottom A part is considered statically balanced when it does not rotate regardless of the position in which it is placed When testing a rotor that is symmetrically supported between identical bearings identical vibration amplitude and phase readings will be measured at the bearings / end of shaft if the unbalance is truly static

2005/10/1Unbalanced force in a rotor is an unavoidable effect Even the most precise rotor balancing exercises are not able to eliminate the unbalance in rotors Therefore any study of rotors supported on rolling element bearing without consideration of unbalance force is rather incomplete and unrealistic

2013/1/1So in the present paper the authors€ main intense is to study the effect of unbalance force on the dynamic behavior of the unbalanced rotor system Harsha [1] is the first who has study the effect of unbalanced forces for cylindrical rolling element bearing which has 8 no of roller

Nonlinear Dynamic Response of an Unbalanced Flexible Rotor

Nonlinear Dynamic Response of an Unbalanced Flexible Rotor Supported by Elastic Bearings Lubricated with Piezo-Viscous Polar Fluids Mustapha Lahmar 1 and Benyebka Bou-Sad 2 * 1 Dpartement de Gnie Mcanique Laboratoire de Mcanique et

On the basis of the V K Stokes micro-continuum theory the effects of couple stresses on the nonlinear dynamic response of the unbalanced Jeffcott's flexible rotor supported by layered hydrodynamic journal bearings is presented in this paper A nonlinear transient modified Reynolds' equation is derived and discretized by the finite element method to obtain the fluid-film pressure field

In this paper the non-linear dynamic analysis of an unbalanced rotor supported by roller bearings has been made The non-linearity in the rotor bearing system is due to Hertzian contact unbalanced rotor effect and radial internal clearance The system can excite bi

Given a rotor operating in free space without bearings or any support system the expected vibration velocity for this rotor balanced to grade G-2 5 is approximately 0 1 in /sec Each balance quality grade refers to the expected vibration velocity in free space measured in in /sec

On the basis of the V K Stokes micro-continuum theory the effects of couple stresses on the nonlinear dynamic response of the unbalanced Jeffcott's flexible rotor supported by layered hydrodynamic journal bearings is presented in this paper A nonlinear transient modified Reynolds' equation is derived and discretized by the finite element method to obtain the fluid-film pressure field

The rotor response depends on both the rotor combined dynamic stiffness (the combined effect of stiffness damping others) and the unbalance excitation Any change in rotor response could result from either a change in unbalance or a change in the restraining rotordynamics stiffness components (for example a shaft crack would reduce the rotor stiffness)

Rotating unbalance is the uneven distribution of mass around an axis of rotation A rotating mass or rotor is said to be out of balance when its center of mass (inertia axis) is out of alignment with the center of rotation (geometric axis) Unbalance causes a moment