Simulation Analysis Of Mechanical Electro-hydraulic System On Aerial Work Platform Executive Device

This paper comes from the Chongqing key scientific and technologicalprogram-execution system key technology and application of aerial work platform(CSTC2009AC6077). Through analyzing the execution system aerial work platform,using electrical and mechanical fluid integration technology, intelligent controltechnology, electro-hydraulic proportional technology, optimization analysis themechnical-electrohydraulic system and control system for each parts of executionsystem of aerial work platform. The main content involve3parts, the design andanalysis of slewing system, the design and analysis of leveling system, the design andanalysis of lifting system.The mainly content of this paper are shown below:(1) In order to improve the stability and the dynamic performance of the slewingsystems, the comprehensive control method of cushion valve and PID controller hasbeen presented. The mathematical model and the AMESim simulation model ofmechnical-electrohydraulic control system of the slewing system have been established.By analyzed the simulation results, it show that this system is stable. The stability ofsystems will be increased and the response time of system will be extendingsignificantly, when the rotation inertia was increased. Besides, the stability and thedynamic performance of system will be improved, when cushion valve and PIDcontroller were equipped.(2) In order to guarantee work platform always in a horizontal position, the controlmethod of fuzzy-PID self-adaption control has been presented. The mathematical modelof the leveling system and the simulation model of electro-hydraulic proportionalclosed-loop control system base on fuzzy-PID self-adaption control have beenestablished. And the simulation has been achieved by using Matlab. The simulationresults show that this system is stable. The system not only can obtain fast response, butalso there is no steady state error, when the fuzzy-PID self-adaption control is adopted.(3) In order to improve the stability and the dynamic performance of the liftingsystems, the control method of PID controller has been presented. The mathematicalmodel of kinetic analysis and the AMESim simulation model ofmechnical-electrohydraulic control system of the lifting system have been established.By analyzed the simulation results, it show that this system is stable. The stability and the dynamic performance of system will be improved, when PID controller wasequipped. The lifting speed of each lifting arm is stability, which has not vibrated. Andalso it will guarantee work platform get a steady rate in the lift, and not vibrate. It willbetter to ensure the safety of the homework personnel.(4) In order to solve this problem that the work platform will overturn suddenly, ashydraulic or control system failure, aerial work platform real-time levelling controlsystem with lock function has been proposed. It not only can reduce system load, butalso can provide dual protection for the safety of homework personnel throughmechanical locking way. It will be of great significance to protect the safety ofoperators.