Experimental determination of the stiffness and damping coefficients of fluid film bearings by means of step forces

1985 ◽  
Vol 18 (2) ◽  
pp. 81-91 ◽  
Author(s):  
Chang Cheng-Song ◽  
Zheng Pei-Yi
Keyword(s):  
Experimental Determination ◽  
Fluid Film ◽  
Damping Coefficients ◽  
Fluid Film Bearings ◽  
Stiffness And Damping

Stability and Damped Critical Speeds of a Flexible Rotor in Fluid-Film Bearings

1974 ◽  
Vol 96 (2) ◽  
pp. 509-517 ◽  
Author(s):  
J. W. Lund
Keyword(s):  
Dynamic Properties ◽  
Fluid Film ◽  
Internal Damping ◽  
Flexible Rotor ◽  
Critical Speeds ◽  
Damping Coefficients ◽  
Fluid Film Bearings ◽  
Multistage Compressor ◽  
Stiffness And Damping ◽  
Rotor Model

A method is described for calculating the threshold speed of instability and the damped critical speeds of a general flexible rotor in fluid-film journal bearings. It is analogous to the Myklestad-Prohl method for calculating critical speeds and is readily programmed for numerical computation. The rotor model can simulate any practical shaft geometry and support configuration. The bearings are represented by their linearized dynamic properties, also known as the stiffness and damping coefficients of the bearing, and the calculation includes hysteretic internal damping in the shaft and destabilizing aerodynamic forces. To demonstrate the application of the method, results are shown for an industrial, multistage compressor.

Experimental determination of fluid-film mass transfer coefficient from adsorption uptake curve

2011 ◽  
Vol 173 (1) ◽  
pp. 49-54 ◽  
Author(s):  
Junpei Fujiki ◽  
Tatsuru Shinomiya ◽  
Takashi Kawakita ◽  
Seiji Ishibashi ◽  
Eiji Furuya
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Experimental Determination ◽  
Fluid Film ◽  
Uptake Curve ◽  
Film Mass Transfer

Technical Note: Rolling dynamic stiffness and damping characteristics of small-sized pneumatic tyres

2000 ◽  
Vol 214 (3) ◽  
pp. 243-248 ◽  
Author(s):  
V. H. Saran ◽  
V. K. Goel
Keyword(s):  
Normal Load ◽  
Dynamic Stiffness ◽  
Technical Note ◽  
Inflation Pressure ◽  
Laboratory Technique ◽  
Damping Coefficients ◽  
Damping Characteristics ◽  
Stiffness And Damping

In this paper, a laboratory technique for determination of rolling dynamic stiffness and damping coefficients of small-sized, bias-ply tyres has been discussed. The effect of normal load, inflation pressure and speed on four different tyres has been reported. The results show similar trends to those reported by other investigators.

Effects of Turbulence and Viscosity Variation on the Dynamic Coefficients of Fluid Film Journal Bearings

1985 ◽  
Vol 107 (2) ◽  
pp. 256-261 ◽  
Author(s):  
D. F. Wilcock ◽  
O. Pinkus
Keyword(s):  
High Speed ◽  
Dynamic Stiffness ◽  
Journal Bearings ◽  
Fluid Film ◽  
Turbulent Regime ◽  
Dynamic Coefficients ◽  
Damping Characteristics ◽  
Fluid Film Bearings ◽  
Viscosity Variation ◽  
Stiffness And Damping

Many high-speed or large fluid film bearings operate in the turbulent regime. However, relatively little consideration has been given to the effects of turbulence and of the variation in viscosity on the dynamic stiffness and damping characteristics of the bearings. Since the dynamic behavior of the rotor supported on such bearings is often closely tied to the bearing dynamic coefficients, knowledge of them may be critical to both the design and the in-place correction of rotor instabilities. These effects are here considered in some detail on the basis of computer calculated analytical results, both in general dimensionless terms and with regard to a specific numerical example.

Seismic Analysis of a Gyroscopic Mechanical System

1983 ◽  
Vol 105 (4) ◽  
pp. 449-455 ◽  
Author(s):  
A. H. Soni ◽  
V. Srinivasan
Keyword(s):  
Mechanical System ◽  
Rotational Motion ◽  
Seismic Analysis ◽  
Fluid Film ◽  
Seismic Excitation ◽  
Rigid Rotor ◽  
Gyroscopic System ◽  
Fluid Film Bearings ◽  
Gyroscopic Effects ◽  
Stiffness And Damping

The dynamic analysis of a gyroscopic mechanical system subjected to seismic excitation is presented. The gyroscopic system consists of a rigid rotor mounted on fluid film bearings. The seismic excitation subjects the base to translational as well as rotational motion. The analysis includes gyroscopic effects, Coriolis effects due to base rotation, and the stiffness and damping provided by the fluid film bearings. A numerical example is solved to show the importance of including the base rotation in the analysis.

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