| Mechanical electrical and hydraulic integration is a very important aspect inthe field of heavy machinery ettecting research of the control strategy andsimulation technology of multi-cylinder. Machining precision of the componentsof the heavy machinery control system and external interference factors are themain factors influncing the precise synchronization of the system. It has a greatresearch significance to improve the synchronization accuracy under the existingproduction conditions.Synchronous control of the hydraulic cylinder is a intractable difficultproblem. Although this problem has been researched in many related literaturesand some good results have been achieved, the most study focus on single-stagesylinder. The problem is that the structure of multi-stage cylinder is morecomplicate than single-stage cylinder, especially the hydraulic shock generatedwhen the second level cylinder is extending effects the synchronous liftinggreatly. The research on synchronization control in the field of hydraulicsynchronous control under different conditions such as different stress ondifferent cylinder, unbalance loading and so on is very necessary.Based on a vertical hydraulic system of hydraulic support test-bed, the factorswhich affect the synchronous performance have been found out. Meanwhile,synchronous performance of system has been studied. The specific details asfollows:(1) Through analyzing the working status of control system which test raisedplatform support and movement characteristics, and the analysis of the load andhydraulic cylinder of stress, the designing idera is put forward, which usingelectrohydraulic proportional technology for the control system, and furtherderived the eletrohydraulic proportional valve and multi-step hydraulic cylinder,the mathematics model of the main components, convenient to our system tounderstanding.(2) An AMEsim model for4-cilyder synchronous system has been buildfor a vertical hydraulic system of hydraulic support test-bed. The working state of hydraulic system is stimulated by AMEsim software. Apart from this, theperformance of the hydraulic system has been analyzed. The simulation wasused to analyze those changes of the four hydraulic cylinders when they arebearing different forces, eccentric loads or stepless loads. Based on thesimulation results, A regulation of the vertical hydraulic system and anoptimization have been found out for this system. At last, a correct validationfor the new scheme has been presented.(3) After the study of fuzzy control,PID control,and fuzzy-PIDcontrol,ultimately we choose to use the fuzzy-PID control strategy to effectivelycontrol the system. We can design control algorithms and fuzzy_PID controllerwith the Simulink software; In order to prove that The controller has asignificant role in the regulation of the system performance and make thesynchronization of the system more stable,we can build a joint simulation modelwith the AMESim and Simulink software to study the the fuzzy-PID control insimulation model.(4) Sum up the full test of the main conclusions: the buffer effect of thechange in level of two-hydraulic cylinders get a better improvement; highersynchronization accuracy of the hydraulic supports the test-bed platform liftsystem; it should outlook and need further study.Through the establishment of the four-cylinder synchronous control systemmodel of the two-steg hydraulic cylinder and the simulation of using theAMESim software, Get the acceleration, velocity and displacement differenceand the impact of various aspects to the synchronization control, these workwill provide reliable basic data for the further development of the testbench;From the results we can be see the system model can well simulate Theactual operation of the stent test bed lifting system. The dynamic characteristicsof multi-stage hydraulic cylinder synchronous control system can be effectivelyresearched by using Co-simulation method. The simulation model of theHydraulic support test bed lifting system has been established, which providesthe reference for the actual system performance analysis and optimizationdesign, simulation confirming for control algorithm and fault diagnosis for hydraulic and mechanical systems. |
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