Non-linear analysis of a flexible rotor system with multi-span bearing supports

2008 ◽  
Vol 222 (2) ◽  
pp. 87-95 ◽  
Author(s):  
Y J Lu ◽  
Y F Zhang ◽  
R Dai ◽  
H Liu ◽  
L Yu ◽  
...  
Keyword(s):  
Linear Analysis ◽  
Rotor System ◽  
Flexible Rotor ◽  
Non Linear

Chaos and bifurcation analysis of a flexible rotor supported by short journal bearings with non-linear suspension

2000 ◽  
Vol 214 (7) ◽  
pp. 931-947 ◽  
Author(s):  
H-T Yau ◽  
C-K Chen ◽  
C-L Chen
Keyword(s):  
Chaotic Motion ◽  
Power Spectra ◽  
Rotor System ◽  
Numerical Results ◽  
Operating Conditions ◽  
Flexible Rotor ◽  
Bifurcation And Chaos ◽  
Symmetric Motion ◽  
Bifurcation Phenomenon ◽  
Non Linear

The bifurcation and chaos of the unbalanced response of a bearing-rotor system with non-linear suspension are investigated on the basis of the assumption of an incompressible lubricant together with short bearing approximation. Numerical results show that, owing to the non-linear factors, the trajectory of the journal centre demonstrates steady state symmetric motion even when the trajectory of the bearing centre is in a state of disorder. Poincaré maps, bifurcation diagrams and power spectra are used to analyse the behaviour of the bearing centre in the horizontal and vertical directions under different operating conditions. A unidirectional bifurcation phenomenon is detected in the bearing-rotor system in this study. The fractal dimension concept is used to determine whether the system is in a state of chaotic motion. Numerical results show that the dimension of the bearing centre trajectory is fractal and greater than 2 in some operating conditions. This indicates that the bearing centre is in the state of chaotic motion at these operating conditions.

Determination of Concrete Cube Strength from Used Samples / Určení Krychelné Pevnosti Betonu U Použitých Zkušebních Trámců

2012 ◽  
Vol 12 (2) ◽  
pp. 186-194 ◽  
Author(s):  
Oldřich Sucharda ◽  
David Mikolášek ◽  
Jiří Brožovský
Keyword(s):  
Compressive Strength ◽  
Concrete Beams ◽  
Linear Analysis ◽  
Bending Tests ◽  
Cube Strength ◽  
Non Linear ◽  
Compressive Strength Of Concrete ◽  
Concrete Cube

Abstract This paper deals with the determination of compressive strength of concrete. Cubes, cylinders and re-used test beams were tested. The concrete beams were first subjected to three-point or fourpoint bending tests and then used for determination of the compressive strength of concrete. Some concrete beams were reinforced, while others had no reinforcement. Accuracy of the experiments and calculations was verified in a non-linear analysis.

scholarly journals A non-linear analysis of running in the heavy and severe intensity domains

2021 ◽  
Author(s):  
Ben Hunter ◽  
Andrew Greenhalgh ◽  
Bettina Karsten ◽  
Mark Burnley ◽  
Daniel Muniz-Pumares
Keyword(s):  
Linear Analysis ◽  
Severe Intensity ◽  
Non Linear

Non-Linear Analysis of Bend Stiffeners

2004 ◽  
Vol 1 (1) ◽  
pp. 25-31 ◽  
Author(s):  
M. A. Vaz ◽  
C. A. D. de Lemos
Keyword(s):  
Linear Analysis ◽  
Non Linear
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