Independent Metering Control Method of Hydraulic Leveling System with Variable Over-running Load
The platform of hydraulic leveling system exists over-running load during back down process,and with the load center of gravity shift and platform tilt changes,the load force acting on the outrigger hydraulic cylinder will also change.The traditional hydraulic system load control valve or counterbalance valve in the balance variable over-running load speed control effect is poor,easy to speed jitter.In order to solve this problem,the independent metering control technology is adopted,and for the variable over-running load condition of the hydraulic cylinder when the platform is falling back,the pressure-flow composite control method is proposed to control the hydraulic cylinder rod chamber in the hydraulic leveling system,and the flow control in the rodless chamber,and the mathematical model is established and verified by the joint simulation of AMESim and Simulink.The results show that,in the event of a sudden change in the load force,the hydraulic cylinder rod chamber pressure and rodless chamber flow can be restored to the control value within 0.2 s,balancing out the system variable beyond the load at the same time,to meet the system speed control requirements.
万方数据
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