scholarly journals Discussion: “Some Dynamic Properties of Oil-Film Journal Bearings With Reference to the Unbalance Vibration of Rotors” (Hagg, A. C., and Sankey, G. O., 1956, ASME J. Appl. Mech., 23, pp. 302–306)

1957 ◽  
Vol 24 (1) ◽  
pp. 158
Author(s):  
P. R. Trumpler
Keyword(s):  
Dynamic Properties ◽  
Journal Bearings ◽  
Oil Film

Some Dynamic Properties of Oil-Film Journal Bearings With Reference to the Unbalance Vibration of Rotors

1956 ◽  
Vol 23 (2) ◽  
pp. 302-306
Author(s):  
A. C. Hagg ◽  
G. O. Sankey
Keyword(s):  
Dynamic Properties ◽  
Journal Bearings ◽  
Oil Film ◽  
Critical Speeds ◽  
Rotor Systems ◽  
Vibration Behavior ◽  
At Resonance ◽  
Oil Films

Abstract Some dynamic properties of oil films have been determined experimentally and their significance in the problem of unbalance vibration and critical speeds of rotor systems is illustrated by an example. It is shown that oil films have an important role in the imbalance-vibration behavior of rotor systems, particularly the vibration magnification at resonance.

Numerical and experimental study on the dynamic bearing properties of a four-pad and eight-pad tilting pad journal bearings in a vertical rotor

2021 ◽  
pp. 1-24
Author(s):  
Gudeta Berhanu Benti ◽  
David Jose Rondon ◽  
Rolf Gustavsson ◽  
Jan-Olov Aidanpää
Keyword(s):  
Dynamic Properties ◽  
Mean Value ◽  
Journal Bearings ◽  
Navier Stokes ◽  
Rigid Rotor ◽  
Navier Stokes Equation ◽  
Vertical Rotor ◽  
Tilting Pad ◽  
Fifth Order ◽  
Tilting Pad Journal Bearings

Abstract In this paper, the dynamics of tilting pad journal bearings with four and eight pads are studied and compared experimentally and numerically. The experiments are performed on a rigid vertical rotor supported by two identical bearings. Two sets of experiments are carried out under similar test setup. One set is performed on a rigid rotor with two four-pad bearings, while the other is on a rigid rotor with two eight-pad bearings. The dynamic properties of the two bearing types are compared with each other by studying the unbalance response of the system at different rotor speeds. Numerically, the test rig is modeled as a rigid rotor and the bearing coefficients are calculated based on Navier-Stokes equation. A nonlinear bearing model is developed and used in the steady state response simulation. The measured and simulated displacement and force orbits show similar patterns for both bearing types. Compared to the measurement, the simulated mean value and range (peak-to-peak amplitude) of the bearing force deviate with a maximum of 16 % and 38 %, respectively. It is concluded that, unlike the eight-pad TPJB, the four-pad TPJB excite the system at the third and fifth-order frequencies, which are due to the number of pads, and the amplitudes of these frequencies increase with the rotor speed.

scholarly journals Dynamic Characteristics of the Oil Film in Journal Bearings

1982 ◽  
Vol 1982 (151) ◽  
pp. 292-298 ◽  
Author(s):  
Yoshiyuki Yamamoto ◽  
Hideomi Ohtsubo ◽  
Shin Morishita
Keyword(s):  
Dynamic Characteristics ◽  
Journal Bearings ◽  
Oil Film
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