| The development of the new generation of aviation hydraulic technology puts forward higher requirements for the aviation hydraulic parts,especially the system pressure from the previous generation of 21 MPa to 28 MPa,therefore,the landing gear retraction control valve to be redesigned.With the improvement of aviation hydraulic technology,modern aircraft increasingly pursue the performance of hydraulic components,so it is necessary to optimize the performance of hydraulic components.At the same time,modern aircraft has higher and higher requirements on maneuverability.There are two ways to increase maneuverability.Hydraulic system weight in the aircraft in a higher proportion,and hydraulic system weight reduction in the hydraulic components and bear the brunt.In this paper,based on the platform of "mbhe-based digital design and research of hydraulic components",a university-enterprise cooperation project between guizhou fengyang hydraulic co.,ltd.of China aviation industry corporation and jilin university,the research,development,optimization and simulation experiment research of the retraction and discharge control valve that is equipped with the landing device control system were carried out.In order to improve the hydraulic valve work pressure,job performance and reduce the hydraulic valve weight,for the purpose of using theoretical analysis,simulation and experimental study the way of combining with landing gear down valve control system of form a complete set of design and optimization,and carry on the simulation and experimental research,for the product research and development and provide scientific evidence for further improvement.This paper analyzes the working system and the structure principle of the control valve and clarifies its performance requirements.The main parameters of the controlvalve are calculated and checked.The force analysis of the control valve is carried out,and the mathematical model of the control valve is established.This paper introduces the increasing design method of hydraulic valve,explains its design process and application scope,and discusses its advantages and disadvantages in engineering application.This paper expounds the advantages and disadvantages of the bushing of the air hydraulic valve,discusses the necessity of the bushing removal of the air hydraulic valve,and introduces the main methods and flow of the split shell design.The design process of the aero-hydraulic valve is optimized based on the increment design method of the hydraulic valve and the design of the de-bushing of the aero-hydraulic valve.The flow passage and flow resistance of the control valve were analyzed by Fluent,a fluid simulation software,and the influence of different shrinkage angles on the flow resistance and flow field of the decreasing oil passage and the influence of the diameter of the return oil bushing cavity on the overall flow resistance and flow field were studied.Finally,the optimization conclusion was given and the optimization results were obtained.The light weight design and performance optimization design of the control valve were carried out.Finally,the optimized weight reduction ratio was 48.02% and the optimized flow resistance ratio was 28.24% on the premise of meeting the technical requirements.Through the establishment of AMESim simulation model of the control valve,the displacement characteristics,pressure characteristics and pressure displacement characteristics of the main valve core of the control valve were analyzed,and the response time was obtained,and the reasons for the difference in response time during the design verification and test were explained.This paper analyzes the influence of different oil viscosity and pilot damping on the characteristics of the control valve,and concludes that increasing damping can effectively adjust the opening and closing response time of the control valve and the valve-opening area-time gradient,but its low-temperature opening and closing characteristics decrease.This has important guiding significance in the design and performance optimization of the control valve.The function test,flow resistance test,leakage test,response characteristic test,low temperature response characteristic test and weight verification test were carried out on the control valve. |
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