G - Physics – 01 – H
Patent
G - Physics
01
H
340/148.7
G01H 1/10 (2006.01)
Patent
CA 1106470
17MY-2453 ABSTRACT OF THE DISCLOSURE An alarm system is disclosed for generating alarms when torsional oscillations of a rotating shaft exceed predetermined limits and fail to subside at a predeter- mined rate. The alarm system receives a torsional oscillation input signal developed by measuring the deviation of instantaneous shaft angle from a uniformly increasing value. The input signal is converted to a direct current torsional oscillation signal representative of the magnitude of oscillation. The torsional oscillation signal is com- pared against a first adjustable reference voltage re- presentative of a first maximum magnitude of oscillation. A low level alarm signal is generated when the oscillation signal exceeds the first reference voltage for a pre- determined length of time. The oscillation signal is also compared against a second reference voltage repre- sentative of a second maximum magnitude of oscillation. An output signal is generated when the oscillation signal exceeds the second reference voltage. The output signal is then employed to activate a rate of decay circuit which generates a signal representative of the rate of decay of the oscillation signal. This representative rate of decay signal is compared against a third reference voltage re- presentative of a minimum acceptable rate of decay. If the representative rate of decay signal exceeds the third adjustable reference voltage a high level alarm signal is generated to indicate that the second maximum magnitude of oscillation has been exceeded and that the minimum required rate of decay has not been attained.
302622
Company General Electric
Eckersley Raymond A.
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