Data processing: measuring – calibrating – or testing – Measurement system – Performance or efficiency evaluation
Reexamination Certificate
2006-05-02
2006-05-02
Raymond, Edward (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Performance or efficiency evaluation
C714S030000
Reexamination Certificate
active
07039557
ABSTRACT:
In a method and apparatus for early detection and prediction of damage to assemblies in machine plants, including mobile machine plants, structure-borne sound of the machine system is sensed by a sensor, output as an acceleration signal and analyzed in a digital signal processor. For this purpose, the acceleration signal is first transformed into the frequency domain by means of a fast-Fourier transformation, and the data obtained in this manner are then transformed back into the time domain by means of cepstrum analysis, so that resonance data relating to individual shock pulses (a cepstrum) is obtained in the time domain. This cepstrum is then compared with a reference cepstrum that is selected in accordance with load signals and rotational speed signals for the present operating state in a new machine plant in a storage device. When limiting values are exceeded, the diagnostic signal (in particular information relating to the assembly which is diagnosed as damaged and its predicted remaining service life) are displayed for the user and an emergency operating mode is initiated.
REFERENCES:
patent: 4545250 (1985-10-01), Miwa
patent: 5629864 (1997-05-01), Noe et al.
patent: 5675506 (1997-10-01), Savic
patent: 5689429 (1997-11-01), Depiante
patent: 5996910 (1999-12-01), Takeda et al.
patent: 6066098 (2000-05-01), Masotti et al.
patent: 2004/0236450 (2004-11-01), Bryant et el.
patent: 31 10 774 (1981-03-01), None
patent: 43 06 270 (1993-03-01), None
patent: 42 17 067 (1993-11-01), None
patent: 195 45 008 (1995-12-01), None
patent: 0 489 261 (1992-06-01), None
patent: 0 413 845 (1993-04-01), None
patent: 0 601 365 (1994-06-01), None
patent: 0 637 012 (1995-02-01), None
patent: 0 764 244 (1997-03-01), None
patent: 1 101 971 (2001-05-01), None
patent: 08114638 (1996-05-01), None
patent: 09079997 (1997-03-01), None
patent: 09210970 (1997-08-01), None
patent: 11311618 (1999-11-01), None
patent: 2001-099757 (2001-04-01), None
patent: WO 99/24699 (1999-05-01), None
DD 214 709 A (Energiewerke Nord GmbH)l; Oct. 17, 1984.
Randall R.B., et al: “Cepstrum, Analysis” Technical Review, Burel OG Kjaer, Naerum, DK, No. 3, 1981, pp. 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” Database accession No. 5722574 (XP002236125) and Proceedings of the Japan-USA Symposium on Flexible Automation—1996; Proceedings of 1996 Japan-USA Symposium on Flexible Automation, Boston, MA, USA, Jul. 7-10, 1996, pp. 427-432 vol. 1, 1996, New York, NY, USA, ASME, USA ISBN: 0-7918-1231-6.
R.B. Randall: “Cepstrum analysis and gearbox fault diagnosis” Maintenance Management International, 1982-1983, pp. 183-208, XP008015538, Manchester UK.
Mayer Christian-Michael
Schwarzhaupt Andreas
Spiegelberg Gernot
Crowell & Moring LLP
Daimler-Chrysler AG
Raymond Edward
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