초록 ▼

Records of signals (FIG. 6) derived from probes (1, 2, 3) in a gas turbine engine are captured (FIG. 8) so as to provide digital signal records indicative of waveshapes (FIGS. 57-80) which can be correlated to identify the causal engine event, including history samples which occur before a record-st

Records of signals (FIG. 6) derived from probes (1, 2, 3) in a gas turbine engine are captured (FIG. 8) so as to provide digital signal records indicative of waveshapes (FIGS. 57-80) which can be correlated to identify the causal engine event, including history samples which occur before a record-starting threshold crossing (FIGS. 6 and 8).

대표청구항 ▼

Electrostatic diagnostic apparatus for distinctly recognizing different events occuring in an operating gas turbine engine, comprising: electrostatic signal means, including a probe to be disposed in he gas stream of an engine, for providing, when said probe is disposed in the gas stream of an opera

Electrostatic diagnostic apparatus for distinctly recognizing different events occuring in an operating gas turbine engine, comprising: electrostatic signal means, including a probe to be disposed in he gas stream of an engine, for providing, when said probe is disposed in the gas stream of an operating engine, a probe signal having a waveshape defined by amplitude variations thereof across a time interval of a given duration in response to electrostatic charge flowing in the gas stream in the vicinity of said probe; an analog to digital converter connected for response to said electrostatic signal means; and digital signal processing means connected to said analog to digital converter (a) for causing said analog to digital converter to sample the signal provided by said electrostatic signal means in a manner to provide a record of digital signals indicative of the amplitude variations therein defining the waveshape thereof, (b) for storing in a history buffer a contiguous sequences of said digital signal, said sequence containing at least a first number of said signals, and (c) for storing in a record buffer, in response to the amplitude of one of said digital signals being in excess of a threshold magnitude, a record comprising (1) said first number of said digital signals stored in said history buffer immediately preceding the one of said digital signals which is in excess of said threshold magnitude and (2) a contiguous sequence of said digital signals sufficient to define the waveshape of said probe signal.