Simulation And Diagnosis Research Of Leaky Malfunction For Hydraulic System Based On AMESim

The stability of work and battlefield survivability of engineering equipment whichis an important part of our military weaponry and used to carrying out engineeringindemnification for army are directly related to the successful completion of the tasksfor combat engineering indemnification as well as the success or failure of the war.Hydraulic transmission is widely used in power transfer for our military engineeringequipment while hydraulic leakage has been one of the problems of technicalindemnification for engineering equipment all the time. It has an important theoreticalsignificance and value of military applications for improving the indemnificationcapabilities of engineering equipment that carrying out the research of malfunctiondiagnosis for leakage of hydraulic system and leak-proof technology as well asexploring ways and means to reduce hydraulic leakage of engineering equipmenteffectively.Against to the problems of single means of malfunction diagnosis as well as beingdiffcult to obtain fault samples for hydraulic leakage. This paper has improved theaccuracy of malfunction diagnosis for events with small samples by taking modelingand simulation as well as leaky malfunction diagnosis for the hydraulic woking deviceof a typical engineering equipment of one mechanized bridge based on the method ofobject-oriented modeling and simulation as well as malfunction diagnosis with supportvector machine which has provided a new intelligent method for the malfunctiondiagnosis of hydraulic leakage. The main research work and achivement of this thesisare as follows.(1)Summarizing the status quo of malfunction diagnosis for leakage of hydraulicsystem systematically as well as the reasons and mechanism of leaky malfunction forhydraulic system are analyzed in detail. The external leakage and inner leakage areequivalent to the orifice flow and gap flow respectively while the viscosity of hydraulicoil and gap size which have a great impact on leakage are got through analysis. Afterthat the diagnosis strategy for hydraulic leaky malfunction has been proposed.(2)The model of hydraulic system work circuit is established for the firstcross-loop erection of one mechanized bridge based on the modeling and simulationsoftware AMESim according to the diagnosis strategy of leaky malfunction developedupon. Then the different malfunction characteristics is got after the introduction of leakymalfunction of the loop of pushing hydraulic cylinder as well as locking hydrauliccylinder and so on for simulation which provides a theoretical basis for the diagnosisand prevention of leaky malfunction.(3)The data samples of flow and pressure converted to characteristic of timedomain by Matlab for the diagnosis of leaky malfunction with support vector machine are extracted from the simulation of leaky malfunction. The model trained by LibSVMwhich is a package for pattern recognition of SVM has diagnosed the position and thereason of leaky malfunction accurately. After that the feasibility and effectiveness of themethod combined with the modeling and simulation of leaky malfunction andmalfunction diagnosis with support vector machine have been verified.(4) The strategies and methods have been explored to prevent leakage based on theresearch of leak-proof work for hydraulic system which has been analyzed from thelinks of the control for the viscosity of hydraulic oil and the control for the gap size ofhydraulic system as well as the correct assembly of hydraulic lines in detail.