Rotordynamics of an Improved Face-grinding Spindle: Rotational Stiffness of Thrust Bearing Increases Radial Stiffness of Spindle

2022 ◽  
pp. 1-19
Author(s):  
Shengye Lin ◽  
Shuyun Jiang
Keyword(s):  
Thrust Bearing ◽  
Rolling Element Bearing ◽  
Rotational Stiffness ◽  
Rolling Bearings ◽  
Radial Stiffness ◽  
Load Carrying ◽  
Rolling Element ◽  
Key Factor ◽  
The Face ◽  
Face Grinding

Abstract The support is a key factor affecting performance of face-grinding spindle. However, advantage of traditional rolling element bearing is not highlighted when it is for large-size face grinding. This technical brief aims to develop a combined support for the face-grinding spindle consisting of a water-lubricated hydrostatic thrust bearing and two types of radial rolling bearings, and the flexible rotor dynamics of the spindle with the combined support is analyzed using the modified transfer matrix method. The results show that the rotational stiffness of water-lubricated hydrostatic thrust bearing can increase the radial stiffness of the face-grinding spindle, so the small-size rolling bearings can be utilized as the radial support for the spindle by aid of such rotational stiffness. A comparative study of comprehensive performance between the spindle supported by rolling bearings and the replacement spindle designed with our proposed combined support shows that the proposed one has technical advantage of large axial load-carrying capacity, low frictional power loss, low temperature rise and etc.

Fault Diagnosis of Bearings Based on Time-Delayed Correlation Demodulation and Fuzzy Clustering

2011 ◽  
Vol 211-212 ◽  
pp. 510-514 ◽  
Author(s):  
Pan Fu ◽  
Wei Lin Li ◽  
Wei Qing Cao
Keyword(s):  
Fault Diagnosis ◽  
Vibration Signal ◽  
Failure Diagnosis ◽  
Rolling Element Bearing ◽  
Rolling Bearings ◽  
Bearing Fault Diagnosis ◽  
Rolling Element ◽  
Fuzzy C Means Clustering ◽  
Important Means ◽  
Set Up

As one of the most common parts of various rolling mechanical equipments, rolling element bearing is vulnerable. Therefore, great attentions have been attributed to the theories, failure diagnosis methods and their applications for rolling bearings. Vibration analysis is also a very important means for bearing fault diagnosis. This paper aims at the research on the methods of signal processing and pattern recognition. An experimental platform was set up for the failure diagnosis of rolling bearings, on which we have done a lot of experiments. Then the vibration signals of normal rolling bearings, rolling bearings with failure on the outer and inner race were collected. Time-delayed correlation demodulation was applied and the features of vibration signal were effectively extracted. Fuzzy C-means clustering system was established to carry out the recognition of the fault of bearings. Experimental results have proved the developed fault diagnostic architecture is reliable and effective.

A Series of New Nonlinear Dynamic Equations of Rolling Element Bearing Systems

2010 ◽  
Vol 118-120 ◽  
pp. 896-901
Author(s):  
Dong Xu ◽  
Yong Cheng Xu ◽  
Xun Chen ◽  
Yong Min Yang ◽  
Xing Lin Li
Keyword(s):  
Rolling Bearing ◽  
Rolling Element Bearing ◽  
Evolution Process ◽  
Radial Clearance ◽  
Rolling Bearings ◽  
Nonlinear Dynamic Equations ◽  
Rolling Element ◽  
Element Bearing ◽  
Fault Evolution ◽  
Additional Equation

As one of the key parts of rotating machinery, rolling bearing is the primary fault source, therefore it is urgent to research failure mechanism and its evolution process. First, the number of laden rollers of rolling bearings in different states without radial clearance and preload is summed up, and then nonlinear analytical equations and an additional equation are proposed. To some extent it will be helpful for researching the fault evolution process of rolling element bearings combined with fatigue theories. Further they will conduce to analyze and predict the remaining life of ball bearings.

A Simplified Model for Structural Vibrations in Ball Bearings

1994 ◽  
Author(s):  
Kambiz Farhang ◽  
Kapil Mehra ◽  
Jayanta Datta
Keyword(s):  
Linear Model ◽  
Equations Of Motion ◽  
Linear Representation ◽  
Accurate Estimate ◽  
Rolling Element Bearing ◽  
Hertzian Contact ◽  
Outer Ring ◽  
Rolling Bearings ◽  
Geometrical Properties ◽  
Rolling Element

Abstract More often than not, in studies involving dynamics and vibration of rotor systems, the bearings within a rotor system are treated as linear components. However, it is well understood that bearing systems are nonlinear due to both their geometrical properties and Hertzian contact between their components. This paper develops a linear formulation to approximate the vibration behavior of rolling bearings. A study of the approximation in the linear representation for rolling bearings is presented in which the effects of preload, lubricant viscosity and outer ring mass on the accuracy of the linear representation are determined. The equations of motion governing the vibrations of rolling element bearing are found to be a set of second-order, nonlinear ordinary differential equations with position periodic coefficients. These equations are linearized about nominal values of the position vectors of the rolling element and the outer ring center. The linearized equations of motion are solved to obtain the small perturbations (displacements) from the nominal positions. The results show that the linear model representation is applicable for bearings with preload. Existence of damping and/or greater outer ring mass enhance the approximation provided by the linear model. Most importantly, the linear representation provides a conservative estimate of the rolling element motion and very accurate estimate of the outer ring motion.

scholarly journals Measurement of vibrations occurring in rolling bearings

Mechanik ◽  
2017 ◽  
Vol 90 (8-9) ◽  
pp. 734-736
Author(s):  
Stanisław Adamczak ◽  
Mateusz Wrzochal ◽  
Paweł Zmarzły
Keyword(s):  
Rolling Bearing ◽  
Measurement Methods ◽  
Rolling Element Bearing ◽  
Vibration Measurement ◽  
Dynamic Measurements ◽  
Rolling Bearings ◽  
Life Period ◽  
Bearing Life ◽  
Rolling Element ◽  
Element Bearing

There are three criteria the vibration measurement methods as applied at each stage of the rolling-element bearing life period could be classified to. Analysis of these methods is suggested for better understanding of the rolling bearing operating problems and of the issues related to dynamic measurements.

Composite Self-Lubricating Bearing Materials

1967 ◽  
Vol 182 (1) ◽  
pp. 33-54 ◽  
Author(s):  
J. K. Lancaster
Keyword(s):  
Solid Lubricants ◽  
Rolling Element Bearing ◽  
Load Carrying ◽  
Rolling Element ◽  
Bearing Materials ◽  
Element Bearing ◽  
Composite Self

A survey is given of progress in the development of self-lubricating materials for load-carrying components (bearings and gears) or for transfer lubrication (rolling element bearing retainers). Various methods for producing composites of inorganic solid lubricants, metals, polymers, carbons and ceramics are briefly described, and some suggestions for further work are included.

scholarly journals Experimental Study of a Flexible Rotor and Its Dependency on the Rolling-Bearing Temperature

2006 ◽  
Vol 2006 ◽  
pp. 1-8 ◽  
Author(s):  
Jean-Jacques Sinou ◽  
Fabrice Thouverez
Keyword(s):  
Experimental Study ◽  
Experimental Tests ◽  
Rolling Bearing ◽  
Rolling Element Bearing ◽  
Flexible Rotor ◽  
Rolling Bearings ◽  
Critical Speeds ◽  
Rolling Element ◽  
Flexible Supports ◽  
Element Bearing

An experimental study of the effects of the bearing temperature on rotor unbalance responses and on the first forward and backward critical speeds is presented. Experimental tests consisted in run-ups and run-downs are realized to a flexible rotor developed and built at the Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513, École Centrale de Lyon, France. This flexible rotor is supported by two rolling bearings on flexible supports. It will be demonstrated that rolling-element bearing temperature has no-negligible effects of the amplitude and values of the forward and backward first critical speeds of the flexible rotor. In addition to the investigation of the influences of the bearing temperature on the dynamics of the flexible rotor at the first critical speeds, a brief investigation into the complete dynamic within the speed range of interest is also conducted. The purpose of this is to examine in detail the vibrational phenomena of the flexible rotor and to detect some characteristics dynamic behaviour due to the presence of rolling-element bearings.

Contact characteristic and vibration mechanism of rolling element bearing in the process of fault evolution

2021 ◽  
Vol 235 (1) ◽  
pp. 19-36 ◽  
Author(s):  
Wenbing Tu ◽  
Jinwen Yang ◽  
Wennian Yu ◽  
Ya Luo
Keyword(s):  
Fault Diagnosis ◽  
Vibration Response ◽  
Rolling Element Bearing ◽  
Bearing Fault Diagnosis ◽  
Rolling Element ◽  
Vibration Mechanism ◽  
Contact Characteristic ◽  
Element Bearing ◽  
Bearing Vibration ◽  
Fault Evolution

The vibration response of rolling element bearing has a close relation with its fault. An accurate evaluation of the bearing vibration response is essential to the bearing fault diagnosis. At present, most bearing dynamics models are built based on rigid assumptions, which may not faithfully reveal the dynamic characteristics of bearing in the presence of fault. Moreover, previous similar works mainly focus on the fault with a specified size without considering the varying contact characteristics as the fault evolves. This paper developed an explicit dynamics finite element model for the bearing with three types of raceway faults considering the flexibility of each bearing component in order to accurately study the contact characteristic and vibration mechanism of defective bearings in the process of fault evolution. The developed model is validated by comparing its simulation results with both analytical and experimental results. The dynamic contact patterns between the rolling elements and the fault, the additional displacement due to the fault and the faulty characteristics within the bearing vibration signal during the fault evolution process are investigated. The analysis results from this work can provide practitioners an in-depth understanding towards the internal contact characteristics with the existence of raceway fault and theoretical basis for rolling bearing fault diagnosis.

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