tools as a means for the monitoring and the diagnosis of assembly faults in internal combustion (i.c) engines through the cold test technology. Firstly, an approach based on the use of symmetrized dot patterns for the visual characterization of vibration signatures is proposed. This method is applied in order to obtain reliable thresholds for the pass/fail decision after the cold test. Secondly, the fault identification is discussed on the basis of the cyclostationary modeling of the signals. First of all, first-order cyclostationarity is exploited through the analysis of the Time Synchronous Average (TSA). Subsequently, second-order cyclostationarity is developed by means of the mean instantaneous power, Wigner-Ville Distribution (WVD) and Wigner-Ville Spectrum (WVS). Finally, the Continuous Wavelet Transform (CWT) is presented and compared with the Wigner Ville Distribution. In order to show the effectiveness and the limitations of the above-mentioned techniques, tests were carried out for a number of different faults. In this paper the results relative to a specific fault are shown as example.

On the monitoring and diagnosis of assembly faults in diesel engine cold tests: a case study / Delvecchio, Simone; D'Elia, Gianluca; Mucchi, Emiliano; DI GREGORIO, Raffaele. - 1:(2010), pp. 3-12. (Intervento presentato al convegno ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2009 tenutosi a San Diego, CA, usa nel 30/08/2009 - 02/09/2009) [10.1115/DETC2009-86264].

On the monitoring and diagnosis of assembly faults in diesel engine cold tests: a case study

DELVECCHIO, Simone;D'ELIA, Gianluca;MUCCHI, Emiliano;DI GREGORIO, Raffaele
2010

Abstract

tools as a means for the monitoring and the diagnosis of assembly faults in internal combustion (i.c) engines through the cold test technology. Firstly, an approach based on the use of symmetrized dot patterns for the visual characterization of vibration signatures is proposed. This method is applied in order to obtain reliable thresholds for the pass/fail decision after the cold test. Secondly, the fault identification is discussed on the basis of the cyclostationary modeling of the signals. First of all, first-order cyclostationarity is exploited through the analysis of the Time Synchronous Average (TSA). Subsequently, second-order cyclostationarity is developed by means of the mean instantaneous power, Wigner-Ville Distribution (WVD) and Wigner-Ville Spectrum (WVS). Finally, the Continuous Wavelet Transform (CWT) is presented and compared with the Wigner Ville Distribution. In order to show the effectiveness and the limitations of the above-mentioned techniques, tests were carried out for a number of different faults. In this paper the results relative to a specific fault are shown as example.
2010
ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2009
San Diego, CA, usa
30/08/2009 - 02/09/2009
1
3
12
Delvecchio, Simone; D'Elia, Gianluca; Mucchi, Emiliano; DI GREGORIO, Raffaele
On the monitoring and diagnosis of assembly faults in diesel engine cold tests: a case study / Delvecchio, Simone; D'Elia, Gianluca; Mucchi, Emiliano; DI GREGORIO, Raffaele. - 1:(2010), pp. 3-12. (Intervento presentato al convegno ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2009 tenutosi a San Diego, CA, usa nel 30/08/2009 - 02/09/2009) [10.1115/DETC2009-86264].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1295051
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