Measuring and testing – Vibration – Sensing apparatus
Patent
1986-11-25
1988-07-19
Levy, Stewart J.
Measuring and testing
Vibration
Sensing apparatus
324207, G01H 1102
Patent
active
047577177
ABSTRACT:
An electrical conductor forming a grid only partially circumferentially surrounds the path of the outer portion of a rotatable member. The member has a magnet coupled thereto for influencing the grid to produce a signal indicative of vibration of the member whenever the magnet is within a predetermined distance of the grid. During the interval that the magnet does not influence the grid, a synthesis signal, indicative of vibration of the member during the previous influence portion of the revolution, is generated. The influence signal and the synthesis signal may be provided to processing apparatus for obtaining vibration information. Providing both an influence signal and a synthesis signal substantially simplifies processing apparatus that would otherwise be needed should only an essentially null signal be available during the interval in which the magnet does not influence the grid. In another embodiment, switching means coordinated with rotation of a plurality of members permits use of a plurality of partially circumferentially disposed grids for monitoring vibration of each of the plurality of members.
REFERENCES:
patent: 3208269 (1951-12-01), Eccles et al.
patent: 4310804 (1982-01-01), Ryan
patent: 4507658 (1985-03-01), Keating
patent: 4510809 (1985-04-01), Fillion
patent: 4518917 (1985-05-01), Oates et al.
patent: 4573358 (1986-03-01), Luango
patent: 4644270 (1987-02-01), Oates et al.
Inductive Method for Measuring Rotor Blade Vibrations on Turbomachines (Staheli, Sulzer Technical Review, 1975).
Rotor Blade Vibration Observed from the Casing--H. Raby, Jun. 1970.
Assa Abraham S.
Reschovsky John M.
Wolfinger John F.
Fess Lawrence G.
General Electric Company
Levy Stewart J.
Squillaro Jerome C.
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