Fault Modeling And Experimental Research Of Gas Turbine Electro-hydraulic Actuator

Gas turbines have continued to develop and progress in the long history,and today’s results have been achieved through the continuous efforts of many predecessors.With the continuous development of my country’s industry and manufacturing industry and the growing economic strength,the demand for gas turbines has also increased,but the technology developed by my country’s independent research and development is not comparable to the technology of developed countries in the world.Foreign gas turbine technology has a long history and rich experience,and the most important technology has been mastered by developed countries in the world,making the field of gas turbine fault diagnosis technology manipulated by foreign markets for a long time.Emerging industrial powers,developing rapidly,need their own core technologies,and should further invest human and financial resources in gas turbine control system related industries.At the same time,the development and improvement of fault diagnosis technology should also keep pace with the times.Fault diagnosis technology is a vital part in many fields,ranging from control valves to the entire control system,especially in large industries,the improvement of fault diagnosis technology can not only save costs and reduce work losses,but also Ensure the personal safety of on-site staff.Therefore,it has profound theoretical guiding significance and great engineering value to improve the localization of gas turbine fault diagnosis.Taking the gas turbine electro-hydraulic actuator as the research object,this paper studies the mechanism model,fault model and fault sequence of the gas turbine electro-hydraulic actuator.The main work and results are as follows:First,according to the actual working state of the gas turbine control system actuator,select the components required by the test platform,set up the test platform in the laboratory,and test the parameters and data of the platform to select the appropriate electro-hydraulic actuator.Secondly,the mechanism modeling is carried out through the working principle of the electro-hydraulic actuator,and then the model is compared and analyzed to establish the fault diagnosis model of the electro-hydraulic actuator,which lays a foundation for the fault simulation of the electro-hydraulic actuator in the control system.Then,the failure modes of electro-hydraulic actuators are analyzed,and the summarized failure modes are divided into two categories: electronic faults and nonelectronic faults;and a FMEA fault sorting method based on the improved analytic hierarchy process is proposed.This method is combined with The traditional RPN fault sorting method is used to analyze the fault mode together.The experimental results show that this method has the advantages of high precision and high practicability.Finally,simulate the mathematical model in MATLAB/Simulink to obtain the dynamic response curve,and perform fault injection on the semi-physical test platform to observe the fault simulation curve simulated by the semi-physical test platform and the dynamic response curve obtained by the normal mathematical model.The two are compared,and the experimental conclusion that the built electro-hydraulic actuator fault model is more accurate is obtained.