Title:
DEVICE AND METHOD FOR THE EARLY RECOGNITION AND PREDICTION OF UNIT DAMAGE
Document Type and Number:
WIPO Patent Application WO2003023721
Kind Code:
A3
Abstract:
The invention relates to a device and a method for the early recognition and prediction of unit damage in machine plants, in particular mobile machine plants. The structural noise of the machine plant is thus recorded by a sensor (1), transmitted as an acceleration signal and analysed in a digital signal processor (DSP). In order to inhibit negative influences from environmental vibrations or structural sound waves which are nothing to do with the status of the machine plant, the acceleration signal is firstly transformed into the frequency domain by means of a fast Fourier transformation and the data thus obtained is then transformed back into the time domain by means of a cepstrum analysis, such that resonance data from single shock impulses (a cepstrum) are obtained in the time domain. Said cepstrum is then compared with a comparative cepstrum, available in a memory unit corresponding to load and speed signals for the current operating status for a new machine plant. On exceeding threshold values the diagnostic signal, in particular information about the unit diagnosed as being damaged and the predicted remaining service life thereof is displayed for the user and an emergency operation initiated.
Inventors:
MAYER CHRISTIAN-MICHAEL (ID)
SCHWARZHAUPT ANDREAS (DE)
SPIEGELBERG GERNOT (DE)
SCHWARZHAUPT ANDREAS (DE)
SPIEGELBERG GERNOT (DE)
Application Number:
PCT/EP2002/007362
Publication Date:
October 09, 2003
Filing Date:
July 03, 2002
Export Citation:
Assignee:
DAIMLER CHRYSLER AG (DE)
MAYER CHRISTIAN-MICHAEL (ID)
SCHWARZHAUPT ANDREAS (DE)
SPIEGELBERG GERNOT (DE)
MAYER CHRISTIAN-MICHAEL (ID)
SCHWARZHAUPT ANDREAS (DE)
SPIEGELBERG GERNOT (DE)
International Classes:
B60T17/22; F16H61/12; G01D21/00; G01H17/00; G01M17/007; G01M99/00; G07C3/00; G07C5/00; (IPC1-7): G07C5/00; G07C3/00
Foreign References:
| DD214709A1 | 1984-10-17 | |||
| US4545250A | 1985-10-08 | |||
| US5629864A | 1997-05-13 | |||
| DE4217067A1 | 1993-11-25 |
Other References:
RANDALL R B ET AL: "CEPSTRUM ANALYSIS", TECHNICAL REVIEW, BRUEL OG KJAER. NAERUM, DK, no. 3, 1981, pages 3 - 44, XP000763132
DATABASE INSPEC [online] INSTITUTE OF ELECTRICAL ENGINEERS, STEVENAGE, GB; ZIYE LI ET AL: "Failure diagnosis system by sound signal for automobile engine", XP002236125, Database accession no. 5722574
R. B. RANDALL: "Cepstrum analysis and gearbox fault diagnosis", MAINTENANCE MANAGEMENT INTERNATIONAL, 1982 - 1983, Manchester UK, pages 183 - 208, XP008015538
DATABASE INSPEC [online] INSTITUTE OF ELECTRICAL ENGINEERS, STEVENAGE, GB; ZIYE LI ET AL: "Failure diagnosis system by sound signal for automobile engine", XP002236125, Database accession no. 5722574
R. B. RANDALL: "Cepstrum analysis and gearbox fault diagnosis", MAINTENANCE MANAGEMENT INTERNATIONAL, 1982 - 1983, Manchester UK, pages 183 - 208, XP008015538
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