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A fault detection and isolation system for detecting leaks and blockages in a fluid handling system having at least one component through which fluid flows includes sensors for measuring fluid conditions upstream and downstream of the component. The sensors generate signals that are representative o

A fault detection and isolation system for detecting leaks and blockages in a fluid handling system having at least one component through which fluid flows includes sensors for measuring fluid conditions upstream and downstream of the component. The sensors generate signals that are representative of the upstream and downstream fluid conditions and are fed to a control algorithm. The control algorithm uses the measured fluid conditions to generate estimates of an inlet state for the component and an outlet state for the component. The control algorithm also calculates innovation sequences for the estimated inlet and outlet states, and then compares the innovation sequences to predetermined thresholds to detect leaks and blockages.

대표청구항 ▼

A fault detection and isolation system for detecting leaks and blockages in a fluid handling system having at least one component through which fluid flows includes sensors for measuring fluid conditions upstream and downstream of the component. The sensors generate signals that are representative o

A fault detection and isolation system for detecting leaks and blockages in a fluid handling system having at least one component through which fluid flows includes sensors for measuring fluid conditions upstream and downstream of the component. The sensors generate signals that are representative of the upstream and downstream fluid conditions and are fed to a control algorithm. The control algorithm uses the measured fluid conditions to generate estimates of an inlet state for the component and an outlet state for the component. The control algorithm also calculates innovation sequences for the estimated inlet and outlet states, and then compares the innovation sequences to predetermined thresholds to detect leaks and blockages. identifying a point in the periodic time domain for sampling detection a value of the cepstrum vibration signal for generating the cepstrum parameter. 8. A method of determining a defect in a machine having a moving part, the method comprising the steps of: operating the machine during run time for producing vibrations from the moving part, the moving part moving at a periodic rate, receiving vibration signals from the vibrations, receiving tachometer signals indicating the periodic rate of the periodic movement of the moving part, acquiring the vibration signals and the tachometer signals, storing the vibration and tachometer signals, retrieving the vibration and tachometer signals, converting the vibration and tachometer signals into digital form and into converted vibration signals and converted tachometer signals, respectively, transforming the converted vibration signals into a Fourier spectrum vibration signal, calculating a two-sided autospectral density signal from the Fourier spectrum vibration signal, logarithmically converting the two-sided autospectral density signal into a logarithmic autospectral density signal, inverse transforming the logarithmic autospectral density signal into a cepstrum vibration signal, detecting a speed signal from the converted tachometer signals, averaging the speed signal into an average speed signal, inverting the average speed signal into an average periodic time value signal, detecting the cepstrum vibration signal at the average periodic time value signal for providing a cepstrum parameter for the machine, repeating all of the steps for a plurality of like machines for defining a base line, and determining when the cepstrum parameter for the machine is outside the base line for indicating the defect of the machine. 9. The method of claim 8 wherein, the vibration signals and the tachometer signals are synchronized in time during the run time, the cepstrum vibration signal and the average periodic time value signal are synchronized in time, and the average periodic time value signal has an average periodic time value for locating the cepstrum parameter as a value of the cepstrum vibration signal at a time point corresponding to an instance in time during the run time. 10. The method of claim 8 wherein, the vibration signals and the tachometer signals are synchronized in time during the run time, the cepstrum vibration signal and the average periodic time value signal are synchronized in time, and the average periodic time value signal has a average periodic time value for locating the cepstrum parameter as a value of the cepstrum vibration signal at a time point corresponding to an instance in time during the run time, the method further comprising the step of: repeating all of the method steps a plurality of times for generating a respective plurality of cepstrum parameters for the machine. 11. The method of claim 8 wherein, the vibration signals and the tachometer signals are synchronized in time during the run time, the cepstrum vibration signal and the average periodic time value signal are synchronized in time, the average periodic time value signal has a average periodic time value for locating the cepstrum parameter as a value of the cepstrum vibration signal at a time point corresponding to an instance in time during the run time, the method further comprising the steps of: repeating all of the steps a plurality of times for generating a set of cepstrum parameters for the machine, and comparing the test set of cepstrum parameters to the base line for determining when the test set of cepstrum parameters are within the base line for indicating a proper operation of the machine and for determining when the test set of cepstrum parameters are outside the base line for indicating the defect of the machine. 12. The method of claim 8 wherein, the vibration signals and the tachometer signals are synchronized in time during the ru