Analysis of Vibration of Super Precision Roller Bearing (Vibration of Rotating Machine)

1969 ◽  
Vol 72 (610) ◽  
pp. 1579-1585
Author(s):  
Yoshiaki GOTO ◽  
Toshiaki WATANABE ◽  
Toshiyuki SAKATA
Keyword(s):  
Roller Bearing ◽  
Special Issue ◽  
Rotating Machine

Rotating Machine Critical Speed Suppressing by Using Electromagnetic Actuators

2011 ◽  
Author(s):  
Johan Der Hagopian ◽  
Jarir Mahfoud
Keyword(s):  
Critical Speed ◽  
Roller Bearing ◽  
The Other ◽  
Constant Current ◽  
Ball Bearings ◽  
Electromagnetic Actuators ◽  
Rotating Machine ◽  
Squirrel Cage ◽  
Hybrid Bearing ◽  
Run Up

The possibility of suppressing critical speeds by using electromagnetic actuators (EMAs) is assessed numerically and experimentally in this paper. The system studied is composed of a horizontal flexible shaft supported by two ball bearings at one end and a roller bearing that is located in a squirrel cage at the other end. Four identical EMAs supplied with constant current are utilized. The EMAs associated to the squirrel cage constitutes the hybrid bearing. Results obtained, show that the constant current, when applied to the EMAs, produces a shift of the first critical speed toward lower values. Moreover, the application of constant current for a speed interval around the critical speed enables a smooth run-up or run-down without crossing any resonance.

scholarly journals Experimental Evaluation on Vibration Analysis of a Needle Roller Bearing with Different Loads

2019 ◽  
Vol 8 (3) ◽  
pp. 2678-2682
Keyword(s):  
Signal Processing ◽  
Fourier Transform ◽  
Experimental Work ◽  
Experimental Evaluation ◽  
Vibration Analysis ◽  
High Stability ◽  
Roller Bearing ◽  
Processing Technique ◽  
Signal Processing Technique ◽  
Rotating Machine

The needle roller bearing is very important part of rotating machine thus the manufacturing of bearing is very essential with low vibration and high stability. In this paper, experimental work is done on oil lubricant of grade (ISO100) with different loads (20N, 40N, 60N, 80N, 100N and 120N) on needle roller bearings (202512). The signal processing technique is used to achieve the vibration analysis using parameter such as Displacement, Velocity, Acceleration and Frequency which obtain by vibration meter. It is the results that are drawn from the experimental work by signal processing technique are plotted in terms of Fast Fourier Transform (FFT

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