Importance

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Abstract

This invention relates to a method for the detection of a shaft failure in a turbomachine with the object of initiating thereupon an appropriate speed-limiting action, more particularly a rapid fuel shut-off on an aero gas-turbine system, in which a torque-exerting turbine rotor and a torque-recipient unit are connected via the shaft (3) to be monitored for failure, said shaft being supported at its ends in at least two roller bearings (6, 7). In this method, the rotational frequencies (f.sub.n1, f.sub.n2) of the two shaft ends of the shaft compared with each other continually and essentially in real time, with a failure of the shaft (3) inferred if the rotational frequency (f.sub.n2) of the roller bearing (7) on the side of the turbine rotor exceeds the rotational frequency (f.sub.n1) of the roller bearing (6) on the side of the torque-recipient unit. Preferably, the rotational frequency of the respective shaft end is determined by way of Fast-Fourier Transmission and an arithmetic processor via separate measuring channels for each roller bearing (6, 7), with recourse being taken to one or more typical roller bearing frequencies emitted by these roller bearings during their rotation (FIG. 1).

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First Claim