Damping in Vibration Transfer Through Deep-Groove Ball Bearings

1998 ◽  
Vol 120 (3) ◽  
pp. 413-420 ◽  
Author(s):  
Yasunaga Mitsuya ◽  
Hidekazu Sawai ◽  
Masaki Shimizu ◽  
Yasushi Aono
Keyword(s):  
Ball Bearing ◽  
Ball Bearings ◽  
Rotation Effect ◽  
Damping Characteristics ◽  
Ball Rolling ◽  
Deep Groove ◽  
Mode Vibration ◽  
Bearing Assembly ◽  
Ball Number ◽  
Lateral Mode

Damping characteristics in vibration transfer through deep-groove ball bearings were measured precisely using a single ball bearing (equivalent to the 6200 type) and the compliance transfer function resulting from the impulses applied to the bearing. To eliminate uncertainties caused by bearing assembly and preloading, a monolithic-type ball bearing was specially fabricated by unifying its inner ring with a shaft, and its outer ring with a rotor. This structure enables preloading without the need for any solid contact using an externally pressurized air bearing. Experimental damping ratios were found to range from two to four percent and damping coefficients 0.15-0.35 Ns/mm. Damping was found to decrease with an increasing preload, and to be larger for a larger clearance and for a larger ball number. The decreases in damping resulting from superimposing the tilting mode vibration upon the lateral mode and from an increasing clearance indicated more ball rolling motion rather than slipping motion to be the cause of decreased damping. Also, the bearing rotation effect is found to be small. Addition of grease hardly provided any additional damping during rotation.

scholarly journals Study on the Dynamic Problems of Double-Disk Rotor System Supported by Deep Groove Ball Bearing

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Yang Liu ◽  
Jiyuan Han ◽  
Siyao Zhao ◽  
Qingyu Meng ◽  
Tuo Shi ◽  
...  
Keyword(s):  
Ball Bearing ◽  
Structural Characteristics ◽  
Great Influence ◽  
Vibration Characteristics ◽  
Rotor System ◽  
Ball Bearings ◽  
Bearing Clearance ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
System Nodes

Aiming at the analysis of the dynamic characteristics of the rotor system supported by deep groove ball bearings, the dynamic model of the double-disk rotor system supported by deep groove ball bearings was established. In this paper, the nonlinear finite element method is used combined with the structural characteristics of deep groove ball bearings. Based on the nonlinear Hertz contact theory, the mechanical model of deep groove ball bearings is obtained. The excitation response results of the rotor system nodes are solved by using the Newmark-β numerical solution method combined with the Newton–Raphson iterative method. The vibration characteristics of the rotor system supported by deep groove ball bearings are studied deeply. In addition, the effect of varying compliance vibration (VC vibration) caused by the change in bearing support stiffness on the dynamics of the system is considered. The time domain and frequency domain characteristics of the rotor system at different speeds, as well as the influence of bearing clearance and bearing inner ring’s acceleration on the dynamics of the rotor system are analyzed. The research shows that the VC vibration of the bearing has a great influence on the motion of the rotor system when the rotational speed is low. Moreover, reasonable control of bearing clearance can reduce the mutual impact between the bearing rolling element and the inner or outer rings of the bearing and reduce the influence of unstable bearing motion on the vibration characteristics of the rotor system. The results can provide theoretical basis for the subsequent study of the nonlinear vibration characteristics of the deep groove ball bearing rotor system.

Modeling of Flexible Coupling to Connect Misaligned Flexible Rotors Supported on Ball Bearings

2014 ◽  
Author(s):  
T. C. Gupta ◽  
K. Gupta
Keyword(s):  
Dynamic Response ◽  
Stiffness Matrix ◽  
Ball Bearing ◽  
Radial Clearance ◽  
Fe Model ◽  
Ball Bearings ◽  
Flexible Coupling ◽  
Flexible Rotors ◽  
Deep Groove ◽  
Coupling Stiffness

Parallel or/and angular misalignment between rotors connected by flexible coupling causes deformation of coupling elements and rotor shafts both. The forces and moments from flexible coupling act on driver and driven rotors simultaneously and depend upon dynamic response of coupled rotor system. The authors’ aim in the present work is to propose a methodology to incorporate the coupling stiffness matrix and coupling loads into the finite element model of flexibly coupled flexible rotors supported on deep groove ball bearings. The coefficients of coupling stiffness matrix and coupling loads are nonlinear and depend upon the amount of parallel and angular misalignments. To segregate the effect of nonlinear stiffness of coupling on the dynamic response of the system, the stiffness of ball bearing is initially considered to be linear. Thereafter, ball bearing nonlinearities arising from radial clearance, Hertzian deformation of balls and races, and varying compliance effect are included into the FE model of the system. Considering different types of misalignments in succession and combination, the dynamic response is characterized by the presence of 1N, 2N and other super or sub harmonics. The misalignment in one plane is found to affect the dynamic response in both the orthogonal planes. Comparing to the stiffness of flexible coupling, the stiffness of ball bearing is of higher order and therefore, nonlinear coupling forces and moments have dominant influence on the dynamic response of the system.

scholarly journals Technological increase of static load carrying capacity of local raceways in ball bearings through ball rolling-off

2018 ◽  
Vol 2018 (12) ◽  
pp. 28-32
Author(s):  
Альберт Королев ◽  
Albert Korolev ◽  
Михаил Захарченко ◽  
Mihail Zakharchenko ◽  
Кристина Мищенко ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Ball Bearing ◽  
Static Load ◽  
Ball Bearings ◽  
Load Carrying Capacity ◽  
Combined Load ◽  
Ball Rolling ◽  
Load Carrying ◽  
Bearing Rings ◽  
External Loads

The paper reports the consideration of the ball rolling-off mechanism of ball bearing rings. The regularities of the distribution of external combined load between balls are defined. There is offered a simulator of a rolling-ff process allowing the ratio definition between a load upon balls and acting factor including the angle of balls contact with a race and a correlation of a radial and axial external loads.

scholarly journals Performance of 75-Millimeter Bore Arched Outer-Race Ball Bearings

1977 ◽  
Vol 99 (3) ◽  
pp. 346-352 ◽  
Author(s):  
H. H. Coe ◽  
B. J. Hamrock
Keyword(s):  
Experimental Data ◽  
Computer Program ◽  
Analytical Study ◽  
Ball Bearing ◽  
Ball Bearings ◽  
Shaft Speed ◽  
Operating Characteristics ◽  
Outer Race ◽  
Deep Groove ◽  
Deep Groove Ball Bearing

An investigation was performed to determine the operating characteristics of 75-mm bore, arched outer-race bearings, and to compare the data with those for a similar, but conventional, deep groove ball bearing. Further, results of an analytical study, made using a computer program developed previously, were compared with the experimental data. Bearings were tested up to 28,000 rpm shaft speed with a load of 2,200 N (500 lb). The amount of arching was 0.13, 0.25, and 0.51 mm (0.005, 0.010, and 0.020 in.). All bearings operated satisfactorily. The outer-race temperatures and the torques, however, were consistently higher for the arched bearings than for the conventional bearings.

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