Research On Synchronous Control Of Digital Hydraulic Cylinder Of The Silo Cover System

The silo cover system is an important part of underwater vertical launch system.In the silo cover system,it is a difficult problem to realize accurate and stable synchronous control of multiple digital hydraulic cylinders due to the high degree of nonlinearity and strong coupling in the multi-digital hydraulic cylinder system,and considering the complexity of working conditions in the silo cover system and the coupling and disturbance between the digital hydraulic cylinders.In this paper,two digital hydraulic cylinders of silo cover system is the research object,and the synchronous control of multiple digital hydraulic cylinders is the research topic.In this paper,a synchronous control system model of digital hydraulic cylinder is established on the basis of consulting a lot of literature,and the influence of various interference factors on the performance of synchronous control system is analyzed.On this basis,three control methods of model reference adaptive control,fuzzy control and feedforward control are studied,and the synchronization control strategy of multi-digital hydraulic cylinder is simulated in detail.Aiming at the problem of poor anti-load interference ability of digital hydraulic cylinder synchronous control system under traditional PID control,the model reference fuzzy adaptive control strategy is applied to digital hydraulic cylinder synchronous control system.The output of the reference model is the ideal output of the system,and the deviation and deviation change rate between the ideal output and the output of each digital hydraulic cylinder are modified by the fuzzy reasoning of the fuzzy adaptive law,so that the output of the digital hydraulic cylinder tends to the output of the ideal reference model.The simulation results show that the model reference fuzzy adaptive synchronous control can effectively reduce the synchronization error of each digital hydraulic cylinder and improve the control performance and robustness of the multi-cylinder synchronous control system.In order to improve the synchronization performance of the digital hydraulic cylinder system,this paper innovatively adopts the interference-based fuzzy feedforward control method to improve the model reference fuzzy adaptive synchronous control system.According to the early debugging experience,the fuzzy rules of the fuzzy feedforward controller are set.The load change and load change rate are taken as the input of the feedforward controller.After the fuzzy reasoning of feedforward controller,the feedforward control quantity is compensated in time to the synchronous control system.The simulation results show that compared with PID control and model reference fuzzy adaptive control strategy,the model reference fuzzy adaptive synchronization control strategy with feedforward control can further improve the synchronization precision and synchronization adjustment speed of the multi-cylinder synchronization control system.Finally,the hardware and software control platform of the digital hydraulic cylinder synchronization control system is built,the digital hydraulic cylinder synchronization controller is designed,and the synchronization control strategy proposed in this paper is studied experimentally.According to the experimental curve,compared with the system with the synchronization control strategy,the synchronization displacement error of the system with synchronization control strategy is reduced by 70%,which fully demonstrates the effectiveness of the model reference fuzzy adaptive synchronization control strategy.