Research On Aircraft Hydraulic Semi-physical Integrated Real-time Simulation System

China's large aircraft manufacturing technology starts late,and has a big gap compared with foreign companies.In the case of the increasing demands of domestic private aviation market,the aircraft-manufacturers must strengthen the study of large aircraft related technologies to improve the market competitive capability.Hydraulic system is one of the most important systems of the aircraft,and the hydraulic integrated management authentication system can reduce the aircraft development costs,and shorten the development cycle.The airplane iron bird test-bed as the comprehensive physical verification platform has a high reliability,but its cost is extremely high.If there is a design flaw,the rework can severely increase the cost of design;The cost of pure software verification platform is not high,but a lot of actual data cannot replace with simulated data,and this causes easily a lower reliability and confidence level.In view of the above problems,this paper presents a kind of aircraft hydraulic integrated management system based on the semi-physical simulation technology and has completed the design and implementation of the system.The main work are as follows: First,by analyzing the control object and the hydraulic systematic working conditions,this paper determines the overall framework of the aircraft hydraulic integrated management system,and also determines the idea of system building by the use of signal acquisition and system simulation technology.Second,in view of the drawback of traditional hydraulic integrated management platform,this paper utilizes the semi-physical simulation technology in the design to realize creatively the free switch between actual and simulation signals.Compared with the software simulation system and the iron bird system,this design increases the confidence level of system simulation and reduces the cost of the theoretical verification.Third,the traditional hydraulic logic verification is only for fixed condition.The control logic should be designed completely before the platform is set up and can't be changed.This paper proposes a novel control logic verification scheme in which the control logic can be designed freely,and this increases its freedom degree of verification.Forth,fault diagnosis is one of the theoretical verifications that hydraulic integrated management system needs to be completed,while the intelligent degree of traditional method is low.In this paper,the fault tree(FTA)and BAM neural network algorithm are introduced to fault diagnosis scheme and it improves the intelligent degree and accuracy of fault diagnosis.In order to verify the rationality of the design of hydraulic integrated management semi-physical simulation system,this paper gives respectively three types of experiments: the simulation,real-time semi-physical simulation and fault diagnosis,and each experiment result has been described in detail.Three kinds of experiment results show that various performance indexes of hydraulic integrated management semi-physical simulation system which is studied and designed in this paper meet the design requirements,and this kind of system has been used in aircraft hydraulic system verification tests.