A Method of On-Line Analysis for Mechanical Dynamic Characteristic

1991 ◽  
Author(s):  
Fengquan Wang ◽  
Huixin Wu ◽  
Xiaolin Han ◽  
Haomin Fu
Keyword(s):  
Dynamic Characteristic ◽  
Rotor System ◽  
Repeated Sequences ◽  
Identification Error ◽  
Line Identification ◽  
On Line ◽  
Line Analysis

Abstract In this paper, a method of multipoint pseudorandom combined excitation with the orthogonal reciprocal repeated sequences (ORRS) is presented on the background of the on-line identification of the multivariate rotor system. The capacaty of the restraint to the identification error caused by the non-random D. C. drift of the multi-input excitation with the ORRS in the rotor system is also discussed. The validity of the method described in this paper is proved by the modelling tests of the multi-plate rotor system.

On-Line Identification and Location of Rotor Cracks

1993 ◽  
Author(s):  
Santosh Ratan ◽  
Haim Baruh ◽  
Jorge Rodriguez
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Rotor System ◽  
Finite Element Discretization ◽  
Element Discretization ◽  
System A ◽  
Line Identification ◽  
Small Depth ◽  
Vector Quantity ◽  
On Line

Abstract A new method is proposed to detect and locate a crack in a rotor system. A vector quantity ‘Residue’ is defined using the measured vibration response of the rotor system and the modeled system matrices. It is shown that the non-zero elements of ‘Residue’ correspond to the nodes encompassing the element carrying the crack. Although, the derivation of ‘Residue’ is based on the linear model of the rotor system, the response due to the non-linearity caused by the breathing of the crack causes only a small amount of contamination. To investigate the robustness of the proposed method, a sensitivity analysis is conducted. It is found that the method could detect a crack of as small depth as 4% of the shaft diameter. The effects of light damping and the order of finite element discretization on the detection result are also investigated, and are found to be small.

On-line identification of parameters in a fermentation process

1979 ◽  
Vol 21 (7) ◽  
pp. 1239-1249 ◽  
Author(s):  
J. P. Bravard ◽  
M. Cordonnier ◽  
J. P. Kernevez ◽  
J. M. Lebeault
Keyword(s):  
Fermentation Process ◽  
Identification Of Parameters ◽  
Line Identification ◽  
On Line

First on-line analysis of petroleum from single inclusion using ultrafast laser ablation

2010 ◽  
Vol 41 (2) ◽  
pp. 74-77 ◽  
Author(s):  
Herbert Volk ◽  
David Fuentes ◽  
Alexander Fuerbach ◽  
Christopher Miese ◽  
Wolfgang Koehler ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Ultrafast Laser ◽  
Single Inclusion ◽  
On Line ◽  
Line Analysis ◽  
Ultrafast Laser Ablation
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