Design And Research On Hydraulic Control System Of Engine Hydraulic Strength Test Bench

Modern warfare requires more and more weapons.In order to meet the overall requirements of missile design,the structural strength of the engine casing needs to be continuously optimized.During the development process,in order to obtain the strength performance of the engine casing,the pressure resistance and burst tests of the engine casing and its accessories need to be performed by a test bench.At present,domestic companies mainly use manual control test benches,which leads to long development cycles and low production efficiency.Therefore,the production of a high-precision,automated engine housing strength test bench is of great significance for enterprises to shorten the development cycle,improve the quality of inspection and production efficiency.According to the requirements of the enterprise,this paper designs an engine casing oil pressure test bench for blast test and pressure test.The test bench has a wide range of pressure(100-700 bar),high control accuracy,continuously adjustable boost rate,Features such as automatic pressure relief.The article describes the working principle of the test bench,determines the technical scheme,calculates the parameters of the design scheme and selects the components;establishes a mathematical model for the pressure control system of the test bench,and performs system stability based on the Bode criterion.Based on the AMESim software,the proportional reversing valve,the proportional relief valve and the load were respectively modeled,and the simulation model of the test bench pressure control system was established.The dynamic characteristics and errors of the test bench pressure control system were analyzed and applied.The genetic algorithm optimizes the PID control strategy of the test bench pressure control system,and uses the optimized PID control parameters to correct the test bench pressure control system to obtain the best control method.The results show that the pressure control system of the test bench using the proportional directional valve and proportional relief valve solution meets the design requirements in terms of response speed,dynamic error and steady-state error after PID correction.