Transmissibility Study of a Flexibly Mounted Rolling Element Bearing in a Porous Bearing Squeeze-Film Damper

1977 ◽  
Vol 99 (1) ◽  
pp. 50-56 ◽  
Author(s):  
C. Cusano ◽  
P. E. Funk
Keyword(s):  
Steady State ◽  
Wall Thickness ◽  
Rolling Element Bearing ◽  
Squeeze Film ◽  
State Data ◽  
Squeeze Film Damper ◽  
Porous Bearing ◽  
Rolling Element ◽  
Element Bearing ◽  
Transient And Steady State

The purpose of this investigation is to study the transmissibility characteristics of a centrally preloaded porous bearing squeeze-film damper supporting a rolling element bearing. Using the short-bearing approximation and isothermal, incompressible lubrication, transient and steady-state data are presented which show that, for the range of parameters considered, porous bearing dampers exhibit superior transmissibility characteristics over equivalent dampers using solid bearings. The data presented are for squeeze-film porous bearings having a wall thickness-to-length ratio of 0.1 and three degrees of permeability, including the case of zero permeability which corresponds to a solid bearing.

Steady-State Performance of Squeeze Film Damper Supported Flexible Rotors

1977 ◽  
Vol 99 (4) ◽  
pp. 552-558 ◽  
Author(s):  
M. D. Rabinowitz ◽  
E. J. Hahn
Keyword(s):  
Steady State ◽  
Critical Speed ◽  
Rolling Element Bearing ◽  
Squeeze Film ◽  
Response Curves ◽  
Flexible Rotors ◽  
Steady State Operation ◽  
Bearing Life ◽  
Rolling Element ◽  
Single Mass

The synchronous steady-state operation of a centrally preloaded single mass flexible rotor supported in squeeze film bearing dampers is examined theoretically. Assuming the short bearing approximation and symmetric motions, frequency response curves are presented exhibiting the effect of relevant system parameters on rotor excursion amplitudes and unbalance transmissibilities for both pressurized and unpressurized lubricant supply. Hence, the influence of rotor flexibility, rotor mass distribution, rotor speed, bearing dimensions, lubricant viscosity, support flexibility can be readily determined, allowing for optimal rotor bearing system design. It is shown that with pressurized bearing mounts, the possibility of undesirable operation modes is eliminated and a smooth passage through the first pin-pin critical speed of the rotor is feasible, while absence of pressurization significantly limits the maximum safe unbalance in the vicinity of this critical speed. Significant decrease in transmissibility and rotor excursion amplitudes over those obtainable with rigid mounts are shown to be a practical possibility, with consequent decrease in the vibration level of the rotor mounts and prolongation of rolling element bearing life, while maintaining acceptable rotor vibration amplitudes. A design example is included to illustrate the use of the data.

Development of Compact Damper Bearing

2005 ◽  
Author(s):  
Hiroshi Kanki ◽  
Yosichika Sato ◽  
Takayuki Ueshima
Keyword(s):  
Rotating Machinery ◽  
Rolling Element Bearing ◽  
Squeeze Film ◽  
Test Results ◽  
Thin Ring ◽  
Compact Size ◽  
Standard Design ◽  
Rolling Element ◽  
Aero Engine ◽  
Element Bearing

The squeeze film damper bearings have been successfully applied for important rotating machinery such as aero engine, high pressure centrifugal compressors[1] and steam turbine[2]. This paper proposes the expansion of application of the damper bearing for small and medium sized rotating machinery. The new damper has a compact size that enable standard design combined with rolling element bearing. A new design of the damper is presented. The new design consists of thin ring and special patterned wire cut grooves. The design analysis and experimental study are presented. The dynamic tests were carried out for this model damper, one is no side seal and the other is with side seals in both ends. Test results showed the sufficient damping effect for actual applications.

High Speed Cylindrical Rolling Element Bearing Analysis “CYBEAN”—Analytic Formulation

1980 ◽  
Vol 102 (3) ◽  
pp. 380-388 ◽  
Author(s):  
R. J. Kleckner ◽  
J. Pirvics ◽  
V. Castelli
Keyword(s):  
Steady State ◽  
High Speed ◽  
Transient Simulation ◽  
Rolling Element Bearing ◽  
Variable Geometry ◽  
Sample Problem ◽  
Rolling Element ◽  
Element Bearing ◽  
Bearing Behavior ◽  
Bearing Analysis

This paper documents the analytic foundation and software architecture for the computerized mathematical simulation of high speed cylindrical rolling element bearing behavior. The software, CYBEAN (CYlindrical BEaring ANalysis), considers a flexible, variable geometry outer ring, EHD films, roller centrifugal and quasidynamic loads, roller tilt and skew, mounting fits, cage and flange interactions. The representation includes both steady state and time transient simulation of thermal interactions internal to and coupled with the surroundings of the bearing. A sample problem illustrating program use is presented.

A New Lateral Vibration Damper Using Leaf Springs

1999 ◽  
Vol 121 (3) ◽  
pp. 343-350 ◽  
Author(s):  
Yang-Gyu Jei ◽  
Jong-Soo Kim ◽  
Seong-Wook Hong ◽  
Si-Young Jung
Keyword(s):  
Rolling Element Bearing ◽  
Squeeze Film ◽  
Leaf Spring ◽  
Lateral Vibration ◽  
Vibration Damper ◽  
Damping Coefficients ◽  
Leaf Springs ◽  
Rolling Element ◽  
Element Bearing ◽  
Stiffness And Damping

The present paper introduces a new lateral vibration damper using leaf springs and oil. This damper, named as a leaf spring damper (LSD), has several beneficial rotordynamic advantages. The leaf spring vibration damper, unlike the well-known squeeze film damper, is simple and easy enough to design the required stiffness and damping coefficients. Furthermore, the damper can be designed as a unit product joined with a rolling element bearing. A theoretical modeling procedure for leaf spring damper is presented in detail. Prototypes of the leaf spring damper are manufactured to test the dynamic characteristics of the damper. Experiments are performed to measure the stiffness and the damping coefficients of the damper.

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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