Fault modeling method for electro-hydraulic actuator of gas turbine

Abstract

The invention discloses a fault modeling method for an electro-hydraulic actuator of a gas turbine, and belongs to the field of fault diagnosis of control systems of gas turbines. The method comprises the following steps: firstly, determining an initial state of an electro-hydraulic actuator and an electromagnetic torque signal output by a three-phase asynchronous motor, and converting into an oil flow signal; then an oil flow signal is converted into mechanical displacement of a valve rod through a rodless cavity hydraulic cylinder; according to the fault injection part, fault parameters such as fault starting time and end time are set, corresponding fault simulation signals are generated according to selected fault types, and the fault simulation signals can change the sizes of detection flow signals and valve position feedback signals. According to the method, the traditional single modeling, the novel rodless cavity hydraulic cylinder and the two-way gear pump are optimized, and compared with a traditional rod symmetric and asymmetric hydraulic cylinder and a one-way gear pump, the efficiency is higher, and the diagnosis result is more accurate.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of an actuator of a control system, in particular to a fault modeling method of an electro-hydraulic actuator of a gas turbine. Background technique [0002] In recent years, with the rapid development of industry and continuous optimization of working equipment and systems, the theoretical knowledge and functional requirements of control systems need to be more complete and comprehensive. As a practical tool, the gas turbine has a very high working efficiency. In the daily work process, there are inevitably some potential safety hazards. Potential hidden dangers are often difficult to find in the early stages of initiation. At the least, they will affect production efficiency and increase costs. Safety, so regular fault inspection and troubleshooting of gas turbines is essential. [0003] The actuator is the executive part of the gas turbine control system. It has been exposed to harsh ...

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Problems solved by technology

[0004] At present, relevant research at home and abroad mainly focuses on the condition monitoring and fault diagnosis technology of the gas turbine body, and the theoretical research and engineering application of the fault diagnosis of the gas turbine control system are still insufficient.

Especially for the fault model diagnosis of electro-hydraulic actuators, the research results at this stage are only the modeling of a single component in the electro-hydraulic actuator; the simulation curve is insufficiently explained and has great limitations

At present, the establishment of the overall fault model of the electro-hydraulic actuator has not been applied to the hydraulic control system

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