Research On The Power Flow Coupling Characteristics Of Mechanical Electrical Hydraulic System Based On The Load Characteristics

With the development of industrial automation, the mechanical electrical hydraulicsystem tends to the direction of high performance, multi function and integration. theequipment structure and information transfer process has become more and morecomplex. How to ensure the system’s safety, reliable and efficient operation become thekey technical problems. As the mechanical electrical hydraulic system in the process ofmulti field and multi process coupling, energy flow, material flow and information flowof interactive transmission, transformation and evolution is the basic condition in theprocess of mechanical electrical hydraulic system function to generate, how to realizerunning state, load conditions and fault evolution in the process of the system functionto generate is one of the first condition to ensure safety, stability of mechanicalelectrical hydraulic system, at the same time it is also a technical problem to be solved.Material flow is the carrier of energy flow, energy flow is the carrier of information flow,information flow will react on energy flow and material flow tend to change in theprocess, at the same time, if the different medium parameters in the system focused onthe energy flow and research the change rules, it will play an important role in researchon the coupling process and mechanism of system. Power is the energy’s change rate,power flow carrying more dynamic information compared with energy flow, exploringthe distribution of power flow under different running load conditions, and research thetype of system power, transfer characteristics, conversion mechanism and stabilitymechanism. The result lays the theoretical foundation for system running statusrecognition, load conditions description and research of fault evolution process.Themain contents are as follows: (1) Using power bond graph to build the power model of mechanical electricalhydraulic system, the system energy transfer, conversion mechanism and power loss,storage were detailed analyzed. The research result can provide theoretical support forthe study of power flow distribution under different load conditions.(2) Combined with matlab/simulink software to establish the simulation model ofsystem, through the simulation to analyze the change rule of mechanical electricalhydraulic system power and running indexes of system efficiency under slope condition,step condition and shock condition. On this basis to study the effect of couplingparameters such as oil bulk modulus, oil viscosity and leakage coefficient on the systemloss power and storage power, and on the overall system stability, working efficiency.(3) Considering the stability of system, In combination with working load on thebasis of analyzing the system stability, the linear system state equation were obtained byusing power coupling model, according to the Lyapunov stability theory in moderncontrol theory to determine the stability of system, The result can lay the foundation forsystem safe and reliable operation in the complex and changeful environment.(4) Simulating typical load of mechanical electrical hydraulic system on themechanical electrical hydraulic integration test platform. By controlling the input powerof inverter motor to control system power flow, the research lays the foundation forsearching match conditions and control method of electric power and load power.