Condition monitoring of rotating machinery is generally performed in stationary conditions or quasi-stationary conditions. Assuming linearity of the sys-tem its dynamic behavior can be simulated in the frequency domain. Simulated re-sults 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 itera-tive procedures, which may become cumbersome. When the dynamic behavior 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 diffi-cult or ineffective; model based diagnostic approach seems not applicable. Moni-toring of machines in ???strong??? non-stationary conditions is generally performed only by means of accurate signal analysis, without modeling the machine or the process. In this paper the simulation of some typical behavior 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 simula-tions. Further examples of systems with strong non-linearity, that in stationary conditions exhibit non-stationary vibrations, are also given.

Dynamical Behavior of Rotating Machinery in non-stationary Conditions: Simulation and Experimental Results

BACHSCHMID, NICOLO';CHATTERTON, STEVEN
2014-01-01

Abstract

Condition monitoring of rotating machinery is generally performed in stationary conditions or quasi-stationary conditions. Assuming linearity of the sys-tem its dynamic behavior can be simulated in the frequency domain. Simulated re-sults 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 itera-tive procedures, which may become cumbersome. When the dynamic behavior 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 diffi-cult or ineffective; model based diagnostic approach seems not applicable. Moni-toring of machines in ???strong??? non-stationary conditions is generally performed only by means of accurate signal analysis, without modeling the machine or the process. In this paper the simulation of some typical behavior 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 simula-tions. Further examples of systems with strong non-linearity, that in stationary conditions exhibit non-stationary vibrations, are also given.
2014
ADVANCES IN CONDITION MONITORING OF MACHINERY IN NON-STATIONARY OPERATIONS - Lecture Notes in Mechanical Engineering
9783642393488
blade vibration; flutter instability; rotating machinery; transient condition analysis
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/940155
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