Design And Research On The Hydraulic Control System Of The Large Flow Fuel Maniford Tester

The large flow fuel manifold tester is a fuel duct test platform of large aircraft engine,Its main function is to detect the flux distribution characteristics and pressure characteristics of the fuel manifold. The lower degree of automation and testing precision of existing ones and operational inconvenience make it difficult to meet the demand of R &D and production of new engines. The studies of the large flow fuel manifold tester of this paper is to conform to the trend of engine tester technical upgrading. On the basis of analyzing the advantages and disadvantages of the existing fuel manifold tester, the large flow fuel manifold is designed, and its pressure control system will be simulated.Firstly, this paper design the large flow fuel manifold tester according to the debugging experience and the structure principle of the sized fuel manifold tester. The hydraulic control principle, electrical and software control system and fuel manifold clamping device and oil receiving devices are studied and design in detail. The proportional directional valve with the connection mode of the dual channel is creatively used in the fuel manifold pressure control system. The proportional directional valve is connected to the bypass,and it controls the supply pressure of the fuel manifold through controlling its feeding flow by throttling function. At the same time, the 5 layer filter is adopted to filter the fuel oil, so as to solve the problem that the fuel is easy to be polluted.The problem of the working conditions of the pressure test and the flow characteristics test mismatching is solved by by designing a three-position pick oil installations, the design will realize the automatic operation and improve the work efficiency.Secondly, a mathematic model and a AMESim model of the pressure control system of the tester are established. The detailed model and its test model of the proportional valve are also established through HCD, simulating the proportional valve, and comparing the simulated curve and its sample curve, so that the model parameters of the parameters proportional directional valve is more close to the actual product.Thirdly, The frequency characteristics of the hydraulic system are simulated according to the mathematical model of the pressure control system. The results show that the pressure control system is stable. The time response and error characteristics of thesystem are simulated by using the AMESim model. The results show that the system is stable and the error is large. Therefore, it is necessary to calibrate the system, the system stability time is shortened and the steady-state error is greatly reduced after the addition of PID. Then the influence of the disturbance signal of the sensor on the stability of the system is analyzed, and the influence of the diameter and length of the pipe on the pressure control performance is analyzed.