Number | Date | Country | Kind |
---|---|---|---|
8807889 | Apr 1988 | GBX |
Number | Name | Date | Kind |
---|---|---|---|
RE28436 | Vitter et al. | Jun 1975 | |
2331152 | Willis | Oct 1943 | |
2985829 | Swift | May 1961 | |
3345867 | Arps | Oct 1967 | |
3626482 | Quichaud et al. | Dec 1971 | |
3714822 | Lutz | Feb 1973 | |
4150568 | Berger et al. | Apr 1979 | |
4359898 | Tanguy et al. | Nov 1982 | |
4471663 | Wallace | Sep 1984 | |
4627276 | Burgess et al. | Dec 1986 | |
4685329 | Burgess | Aug 1987 | |
4773263 | Lesage et al. | Sep 1988 |
Number | Date | Country |
---|---|---|
1330191 | Nov 1970 | GBX |
Entry |
---|
Bogert et al., "The Quefrequency Analysis . . . Saphe Cracking", Proceedings of Symposium on Time Series Analysis, Wiley, pp. 209-243, 1963. |
"Cepstrum Analysis and Gearbox Fault Diagnosis", Application Notes from Equipment Manufacturer Bruel and Kjaer. |
SPE Paper No. 16660-"The Effects of Quasi-Random Drill Bit Vibrations Upon Drillstring Dynamic Behavior", by E. Skaugen, Sep. 27-30, 1987, Dallas TX. |