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2014 | OriginalPaper | Buchkapitel

Dynamical Behavior of Rotating Machinery in Non-Stationary Conditions: Simulation and Experimental Results

verfasst von : Nicolò Bachschmid, Steven Chatterton

Erschienen in: Advances in Condition Monitoring of Machinery in Non-Stationary Operations

Verlag: Springer Berlin Heidelberg

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Abstract

Condition monitoring of rotating machinery is generally performed in stationary conditions or quasi-stationary conditions. Assuming linearity of the system its dynamic behaviour can be simulated in the frequency domain. Simulated results are then compared to measured results and the comparison allows to apply model based diagnostic procedures. As soon as the system presents strong non-linearity, simulation must be performed in the time domain, including also iterative procedures, which may become cumbersome. When the dynamic behaviour of linear or non-linear systems in non-stationary conditions is simulated, the time domain integration must be necessarily used. Accuracy of simulated results gets weaker; comparison with measured results for diagnostic purposes becomes difficult or ineffective; model based diagnostic approach seems not applicable. Monitoring of machines in “strong” non-stationary conditions is generally performed only by means of accurate signal analysis, without modelling the machine or the process. In this paper the simulation of some typical behaviour of rotating machines in weak or strong non-stationary conditions in the time domain is presented and discussed. Some experimental results are also presented and compared to simulations. Further examples of systems with strong non-linearity, that in stationary conditions exhibit non-stationary vibrations, are also given.

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Literatur
1.
Zurück zum Zitat SanvitoM, Pesatori E, Bachschmid N, Chatterton S (2012) Analysis of LP steam turbine blade vibrations: experimental results and numerical simulations, 10th International conference on vibrations in rotating machinery IMechE, London, pp 11–13 SanvitoM, Pesatori E, Bachschmid N, Chatterton S (2012) Analysis of LP steam turbine blade vibrations: experimental results and numerical simulations, 10th International conference on vibrations in rotating machinery IMechE, London, pp 11–13
2.
Zurück zum Zitat Bachschmid N, Pennacchi P, Pesatori E, Turozzi G (2007) On the “snubbing” mechanism for reducing blade vibration, proceedings of the ASME international design engineering technical conferences and computers and information in engineering conference, DETC2007, 1261–1270 Bachschmid N, Pennacchi P, Pesatori E, Turozzi G (2007) On the “snubbing” mechanism for reducing blade vibration, proceedings of the ASME international design engineering technical conferences and computers and information in engineering conference, DETC2007, 1261–1270
3.
Zurück zum Zitat Ferrante M, Pesatori E, Bachschmid N (2012) Simulation of the dynamic behavior of a group of blades with friction contacts, 10th international conference on vibrations in rotating machinery IMechE, London, 11–13 Ferrante M, Pesatori E, Bachschmid N (2012) Simulation of the dynamic behavior of a group of blades with friction contacts, 10th international conference on vibrations in rotating machinery IMechE, London, 11–13
4.
Zurück zum Zitat Bachschmid N, Pennacchi P, Vania A (2000) Modeling of spiral vibrations due to rub in real rotors, 7th international conference on vibrations in rotating machinery IMechE, C576/082 Bachschmid N, Pennacchi P, Vania A (2000) Modeling of spiral vibrations due to rub in real rotors, 7th international conference on vibrations in rotating machinery IMechE, C576/082
5.
Zurück zum Zitat Vania A, Bachschmid N, Pennacchi P (2001) Analysis of light rotor-to-stator contacts in large turbine-generator units, 4th International conference on acoustical and vibratory surveillance methods and diagnostic techniques, Compiègne, France Vania A, Bachschmid N, Pennacchi P (2001) Analysis of light rotor-to-stator contacts in large turbine-generator units, 4th International conference on acoustical and vibratory surveillance methods and diagnostic techniques, Compiègne, France
6.
Zurück zum Zitat Bachschmid N, Pennacchi P, Vania A (2007) Some results in steam whirl analysis, 12th IFToMM world congress, Besançon, France, 18–21 Bachschmid N, Pennacchi P, Vania A (2007) Some results in steam whirl analysis, 12th IFToMM world congress, Besançon, France, 18–21
Metadaten
Titel
Dynamical Behavior of Rotating Machinery in Non-Stationary Conditions: Simulation and Experimental Results
verfasst von
Nicolò Bachschmid
Steven Chatterton
Copyright-Jahr
2014
Verlag
Springer Berlin Heidelberg
DOI
https://doi.org/10.1007/978-3-642-39348-8_1

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