考虑间隙热形变的宽温域液压滑阀卡滞模型分析研究OA

The hydraulic operating device of aircraft utilized in alpine areas typically operates within an ambient temperature range of －40℃to 150℃.Under such extreme conditions,the radial clearances of the hydraulic slide valves may be altered,leading to sticking or a delayed response.To address the sticking problem of hydraulic slide valves under a wide temperature range,we establish a mathematical model of thermal deformation of clearance in the hydraulic slide valve and validate the finite element simulation model.The results show that the maximum relative error between the simulation model and the mathematical model does not exceed 0.3%,confirming the rationality and correctness of the thermal deformation model of clearance.Meanwhile,considering machining precision errors,hydraulic oil viscosity and other factors,we establish a mathematical model of sticking force incorporating the thermal deformation of hydraulic slide valve clearance.The study reveals the variation law of sticking force of hydraulic slide valves in different states.Through experimental research,the error between simulation and test results of the hydraulic slide valve is within 2%considering thermal deformation due to clearances,which verifies the accuracy of the sticking force model.