Gas path fault diagnostic method for marine gas turbine based on fuzzy Petri net (FPN)

Abstract

The invention discloses a gas path fault diagnostic method for a marine gas turbine based on a fuzzy Petri net (FPN), comprising the following steps of: (1) obtaining the operating standard value of the marine gas turbine; (2) based on an actually-measured value, calculating the membership grade of the actual operating parameter deviation belonging to the criterion deviation fuzzy subset by using a membership function; (3) defining the FPN in response to the characteristics of the fault diagnostic Petri net after determining the operating standard value and the deviation; and (4) determining a FPN reasoning algorithm for gas path fault diagnosis for the marine gas turbine based on related definitions of the transitional enabling and igniting rules. Through the gas path fault diagnostic method for the marine gas turbine based on the fuzzy Petri net (FPN), the defects of not strong university, wrong judgment and reasoning of the traditional method are overcome; it is actually proved that the problems of fuzziness and nondeterminacy in an gas path fault can be effectively solved by the gas path fault diagnostic algorithm for the marine gas turbine established by the gas path fault diagnostic method disclosed by the invention.

Description

technical field [0001] The invention belongs to a performance diagnosis and trend analysis system of a marine gas turbine, in particular to a method for diagnosing a gas path fault of a marine gas turbine based on a fuzzy Petri net. Background technique [0002] The gas circuit fault diagnosis of gas turbine is to compare the measurable parameters of the gas circuit in the actual operation of the engine (such as: speed, pressure, temperature, etc.) with the reference value of normal operation, and the resulting deviation is used as the basis for detection, isolation and identification of component failure method. The principle of this diagnostic method was first proposed by Urban in 1972. The traditional gas circuit fault diagnosis uses the deviation criterion of deterministic theory, that is, when a set of parameter deviations is a set of fixed values, it may represent a certain fault, but There is actually a lot of uncertainty and ambiguity in this judgment. [0003] Fir...

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Problems solved by technology

[0009] In order to effectively overcome the problems caused by fuzzy and uncertain factors in the gas path fault diagnosis of marine gas turbines, and in order to fully reflect the ignition rules of FPN, the present invention proposes a FPN model for the characteristics of Petri nets used for fault diagnosis , the model's matrix form, transition enablement and ignition rules are appropriately modified and defined, and the uncertainty knowledge and procedural fuzzy diagnostic reasoning are completed through simple matrix and set operations

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