Dynamic behaviour of thin cylindrical shell rotating with high-speed

1977 ◽  
Vol 46 (2) ◽  
pp. 75-84 ◽  
Author(s):  
S. Suzuki
Keyword(s):  
Cylindrical Shell ◽  
High Speed ◽  
Dynamic Behaviour ◽  
Thin Cylindrical Shell

Torsional Vibrations in Rotor Shells

1998 ◽  
Vol 212 (4) ◽  
pp. 263-276 ◽  
Author(s):  
R Whalley ◽  
M Ebrahimi
Keyword(s):  
Cylindrical Shell ◽  
Manufacturing Process ◽  
High Speed ◽  
Damping Ratio ◽  
Operating Conditions ◽  
Torsional Vibrations ◽  
Thin Cylindrical Shell ◽  
Paper Manufacturing ◽  
Simulation Results ◽  
Transient Oscillations

Rotors comprising a motor-driven thin cylindrical shell with rigidly attached ends and torsional dampers, all of which are supported on bearings, are investigated. Analysis procedures enabling the variations in the model singularities with parameter changes are outlined. General results are derived indicating that the system damping ratio is maximized under specific operating conditions. A typical high-speed rotor for a paper manufacturing process is considered and analytical and simulation results are presented, confirming the predicted optimum damper settings and thereby minimizing the transient oscillations.

Development of a machining simulator considering machine behaviour

2003 ◽  
Vol 217 (9) ◽  
pp. 1333-1339 ◽  
Author(s):  
A Dugas ◽  
J J Lee ◽  
M Terrier ◽  
J Y Hascoët
Keyword(s):  
High Speed ◽  
Dynamic Behaviour ◽  
Three Dimensional ◽  
Milling Process ◽  
High Speed Machining ◽  
Tracking Errors ◽  
Tool Paths ◽  
Milling Operation ◽  
Dynamic Errors ◽  
Tool Deflections

High-speed machining gives much potential for increasing the efficiency of the milling operation, but it requires very careful preparation for the milling process to use this potential. A machining simulator has been developed that can analyse dynamic errors due to tool deflections and machine dynamic behaviour using a three-dimensional solid simulation model. This kind of simulator would be a useful tool to apply in high-speed machining where it is necessary to obtain very well prepared part programs considering dynamic errors as well as geometrical errors. In this short communication, an algorithm will be introduced to estimate the dynamic errors caused by machine dynamic behaviour. Specifically, this algorithm predicts real feed rates and tracking errors considering the limits of numerical controllers and machine tools. The efficiency of the algorithm has been verified through several experiments with various tool paths. In addition, the algorithm has been integrated into the machining simulator. Some results obtained from the machining simulator concerning the estimation of tracking errors will be reported.

scholarly journals Model Adjustment of Small Rotors for High Speed Gas Turbines

1990 ◽  
Author(s):  
Alain Delbez ◽  
Christian Beth ◽  
Daniel Gay
Keyword(s):  
Gas Turbines ◽  
High Speed ◽  
Dynamic Behaviour ◽  
Design Stage ◽  
Rotor Bearing ◽  
Angular Velocities ◽  
Model Adjustment ◽  
Experimental Approaches

In this paper, we present the studies which are carried out at MICROTURBO relating to rotor-bearing systems mounted in small high speed gas turbines. These studies are based on both theoretical and experimental approaches, and are aimed at providing an improved prediction of the dynamic behaviour of rotors at the design stage, in particular the critical angular velocities and sensitivity to unbalance.

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