The influence of crack-imbalance orientation and orbital evolution for an extended cracked Jeffcott rotor

J. Gómez-Mancilla; Jean Jacques Sinou; V. R. Nosov; F. Thouverez; A. Zambrano

doi:10.1016/j.crme.2004.09.007

The influence of crack-imbalance orientation and orbital evolution for an extended cracked Jeffcott rotor

J. Gómez-Mancilla, Jean Jacques Sinou, V. R. Nosov, F. Thouverez, A. Zambrano

Escuela Superior de Ingeniería Mecánica y Eléctrica (ESIME), Unidad Zacatenco

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

Vibration peaks occurring at rational fractions of the fundamental rotating critical speed, here named Local Resonances, facilitate cracked shaft detection during machine shut-down. A modified Jeffcott-rotor on journal bearings accounting for gravity effects and oscillating around nontrivial equilibrium points is employed. Modal parameter selection allows this linear model to represent first mode characteristics of real machines. Orbit evolution and vibration patterns are analyzed, yielding useful results. Crack detection results indicate that, instead of 1x and 2x components, analysis of the remaining local resonances should have priority; this is due to crack-residual imbalance interaction and to 2x multiple induced origins. Therefore, local resonances and orbital evolution around 1/2, 1/3 and 1/4 of the critical speed are emphasized for various crack-imbalance orientations.

Original language	English
Pages (from-to)	955-962
Number of pages	8
Journal	Comptes Rendus - Mecanique
Volume	332
Issue number	12
DOIs	https://doi.org/10.1016/j.crme.2004.09.007
State	Published - Dec 2004

Keywords

Crack detection
Dynamic systems
Extended Jeffcott rotor
Local resonance
Orbital evolution
Rotor dynamics
Vibrations

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10.1016/j.crme.2004.09.007

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title = "The influence of crack-imbalance orientation and orbital evolution for an extended cracked Jeffcott rotor",

abstract = "Vibration peaks occurring at rational fractions of the fundamental rotating critical speed, here named Local Resonances, facilitate cracked shaft detection during machine shut-down. A modified Jeffcott-rotor on journal bearings accounting for gravity effects and oscillating around nontrivial equilibrium points is employed. Modal parameter selection allows this linear model to represent first mode characteristics of real machines. Orbit evolution and vibration patterns are analyzed, yielding useful results. Crack detection results indicate that, instead of 1x and 2x components, analysis of the remaining local resonances should have priority; this is due to crack-residual imbalance interaction and to 2x multiple induced origins. Therefore, local resonances and orbital evolution around 1/2, 1/3 and 1/4 of the critical speed are emphasized for various crack-imbalance orientations.",

keywords = "Crack detection, Dynamic systems, Extended Jeffcott rotor, Local resonance, Orbital evolution, Rotor dynamics, Vibrations",

author = "J. G{\'o}mez-Mancilla and Sinou, {Jean Jacques} and Nosov, {V. R.} and F. Thouverez and A. Zambrano",

note = "Funding Information: The first author is grateful to {\'E}cole Centrale de Lyon, France, for financial support during his sab-batical year. Work partially sponsored by Consejo Nacional de Ciencia y Tecnologia, CONACyT, Project 38711-U. Thanks to S.N.I. and EDI scholarships granted by CONACyT, and Instituto Polit{\'e}cnico Nacional, IPN, respectively. Graduate student Zambrano upgraded program for this study.",

year = "2004",

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doi = "10.1016/j.crme.2004.09.007",

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AU - Gómez-Mancilla, J.

AU - Sinou, Jean Jacques

AU - Nosov, V. R.

AU - Thouverez, F.

AU - Zambrano, A.

N1 - Funding Information: The first author is grateful to École Centrale de Lyon, France, for financial support during his sab-batical year. Work partially sponsored by Consejo Nacional de Ciencia y Tecnologia, CONACyT, Project 38711-U. Thanks to S.N.I. and EDI scholarships granted by CONACyT, and Instituto Politécnico Nacional, IPN, respectively. Graduate student Zambrano upgraded program for this study.

PY - 2004/12

Y1 - 2004/12

N2 - Vibration peaks occurring at rational fractions of the fundamental rotating critical speed, here named Local Resonances, facilitate cracked shaft detection during machine shut-down. A modified Jeffcott-rotor on journal bearings accounting for gravity effects and oscillating around nontrivial equilibrium points is employed. Modal parameter selection allows this linear model to represent first mode characteristics of real machines. Orbit evolution and vibration patterns are analyzed, yielding useful results. Crack detection results indicate that, instead of 1x and 2x components, analysis of the remaining local resonances should have priority; this is due to crack-residual imbalance interaction and to 2x multiple induced origins. Therefore, local resonances and orbital evolution around 1/2, 1/3 and 1/4 of the critical speed are emphasized for various crack-imbalance orientations.

AB - Vibration peaks occurring at rational fractions of the fundamental rotating critical speed, here named Local Resonances, facilitate cracked shaft detection during machine shut-down. A modified Jeffcott-rotor on journal bearings accounting for gravity effects and oscillating around nontrivial equilibrium points is employed. Modal parameter selection allows this linear model to represent first mode characteristics of real machines. Orbit evolution and vibration patterns are analyzed, yielding useful results. Crack detection results indicate that, instead of 1x and 2x components, analysis of the remaining local resonances should have priority; this is due to crack-residual imbalance interaction and to 2x multiple induced origins. Therefore, local resonances and orbital evolution around 1/2, 1/3 and 1/4 of the critical speed are emphasized for various crack-imbalance orientations.

KW - Crack detection

KW - Dynamic systems

KW - Extended Jeffcott rotor

KW - Local resonance

KW - Orbital evolution

KW - Rotor dynamics

KW - Vibrations

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DO - 10.1016/j.crme.2004.09.007

M3 - Artículo

SN - 1631-0721

VL - 332

SP - 955

EP - 962

JO - Comptes Rendus - Mecanique

JF - Comptes Rendus - Mecanique

IS - 12

ER -

The influence of crack-imbalance orientation and orbital evolution for an extended cracked Jeffcott rotor

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Keywords

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