scholarly journals Atomistic spin model based on a spin-cluster expansion technique: Application to the IrMn3/Co interface

2011 ◽  
Vol 83 (2) ◽  
Author(s):  
L. Szunyogh ◽  
L. Udvardi ◽  
J. Jackson ◽  
U. Nowak ◽  
R. Chantrell
Keyword(s):  
Cluster Expansion ◽  
Spin Model ◽  
Spin Cluster ◽  
Model Based ◽  
Expansion Technique

A Molecular Dynamic Study on the Equation of State for Argon Fluid at Temperatures Near its Critical Point

2014 ◽  
Vol 543-547 ◽  
pp. 3959-3962
Author(s):  
Xiao Bin Lv ◽  
Xiao Feng Yang
Keyword(s):  
Equation Of State ◽  
Molecular Dynamic ◽  
Cluster Expansion ◽  
Simple Form ◽  
Empirical Formula ◽  
Molecular Dynamic Method ◽  
Dynamic Method ◽  
The Third ◽  
Ideal Gases ◽  
Expansion Technique

In this paper, we have developed an empirical formula describing the equation of state of argon fluid using cluster expansion technique and commonly used force parameters. To test the reliability of the formula, we have further simulated the equation of state for argon at corresponding states employing molecular dynamic method. The comparisons have shown that the empirical formula gives much better prediction than that from the simple form equation of ideal gases and the inclusion of the third virial terms in expansions is prominently important.

Hybrid Model Based Identification of Local Rubbing Fault in Rotor Systems

2005 ◽  
Vol 293-294 ◽  
pp. 355-364 ◽  
Author(s):  
Qing Kai Han ◽  
Tao Yu ◽  
He Li ◽  
Zhao Ye Qin ◽  
Zhi Wei Zhang ◽  
...  
Keyword(s):  
Hybrid Model ◽  
Element Model ◽  
Identification Algorithm ◽  
Modal Expansion ◽  
Oil Film ◽  
Rotor Systems ◽  
Model Based ◽  
Fault Severity ◽  
Expansion Technique ◽  
Film Stiffness

A quantitative identification procedure for local rubbing fault in rotor systems based on a hybrid model is proposed. The hybrid model combines finite element model of rotor and rigid discs, online identified oil film stiffness and elastic supports. The identification algorithm of oil film parameters is stated in detail. The hybrid model based diagnosis process for local rubbing fault is described with assumption of periodic rubbing forces. With the help of modal expansion technique, the estimated rubbing forces at each node along rotor are checked for the rubbing position. The estimated rubbing forces at ascertained position are then used in fault severity assessing quantitatively next. These approaches have been tested successfully on a test rig with single rotor double discs.

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