Numerical analysis on the dynamic behaviour of a sea bed around breakwater

1993 ◽  
Vol 30 (4) ◽  
pp. A252
Keyword(s):  
Numerical Analysis ◽  
Dynamic Behaviour ◽  
Sea Bed

scholarly journals Experimental and numerical analysis of the dynamic behaviour in tension of an armour steel for applications in defence industry

2015 ◽  
Vol 94 ◽  
pp. 05004
Author(s):  
Ezio Cadoni ◽  
Matteo Dotta ◽  
Daniele Forni ◽  
Gianmario Riganti ◽  
Hanspeter Kaufmann
Keyword(s):  
Numerical Analysis ◽  
Dynamic Behaviour ◽  
Defence Industry ◽  
Armour Steel

scholarly journals Dynamic Behaviour of β-Ti-15333 in Ultrasonically Assisted Turning: Experimental and Numerical Analysis

2017 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Riaz Muhammad ◽  
Naseer Ahmed ◽  
Himayat Ullah ◽  
Vadim V. Silberschmidt
Keyword(s):  
Numerical Analysis ◽  
Dynamic Behaviour

Transient Response of Active Magnetic Bearing Rotor During Rotor Drop on Backup Bearings

2006 ◽  
Vol 220 (6) ◽  
pp. 785-794 ◽  
Author(s):  
S Zeng ◽  
J-Q Zhang ◽  
H-N Wang
Keyword(s):  
Numerical Analysis ◽  
Dynamic Behaviour ◽  
Magnetic Bearing ◽  
Rotating Machinery ◽  
Active Magnetic Bearing ◽  
Active Magnetic Bearings ◽  
Transient Behaviour ◽  
Whirling Motion ◽  
Full Speed ◽  
Rotor Journal

Backup bearing is a key safety component of the rotating machinery with the active magnetic bearings (AMBs). Owing to many unexpected reasons, the AMB rotor running at the full speed may drop onto the backup bearings. Sometimes, the full clearance whirling motion is induced, which is harmful to the machine. Therefore, it is quite important to know the transient behaviour of the AMB rotor and the backup bearing. Till date, a lot of works have been performed on the AMB rotor drop and various mathematical models were established. However, most of them took into account only the interaction between the rotor journal and the backup bearing but neglected the interaction between the shaft and the stator component. As we know, for a real AMB machinery, there should be seal components, and the clearance of the seal component is very small to avoid the leakage. If an AMB failure occurs, the interaction between the shaft and the seal component is likely to happen. Thus, it is more reasonable to include this factor into the AMB rotor drop model. The problem is addressed in this work. The previous model is extended to include the shaft-stator contact. The numerical analysis based on two sets of AMB rotor data shows that the dynamic behaviour of the AMB changes greatly, if the shaft-stator contact is considered. There is no longer an optimum support damping to prevent the harmful full clearance whirling motion, and at this time, a well-balanced AMB rotor is preferred.

scholarly journals Local and global stability of a piecewise linear oscillator

1992 ◽  
Vol 338 (1651) ◽  
pp. 533-546 ◽  
Keyword(s):  
Mathematical Model ◽  
Numerical Analysis ◽  
Nonlinear Oscillator ◽  
Dynamic Behaviour ◽  
Piecewise Linear ◽  
Global Bifurcation ◽  
Simple Mathematical Model ◽  
Periodic Excitation ◽  
Restoring Force ◽  
Modern Methods

Machines and mechanisms with moving parts, subjected to periodic excitation, often show unexpected dynamic behaviour, and impacts due to their connection clearances may occur. The most simple mathematical model is a one degree-of-freedom nonlinear oscillator governed by a piecewise linear symmetric function to describe the restoring force. The system’s response, which can be quite rich and complicated, is described in detail. Modern methods for a combined analytical and numerical analysis are used to study local and global bifurcation conditions, coexisting solutions and their associated domains of attraction.

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