Research On Double Fuzzy Four-cylinder Synchronous Control Based On Adjacent Cross Coupling

With the extensive use of hydraulic technology in military,aerospace,marine engineering and other fields.In China,more and more attention has been paid to the development hydraulic technology.But in high pressure,high interference,high load occasions,the traditional hydraulic system is difficult to meet the performance requirements,so it requires a number of hydraulic cylinders in the work of synchronous cooperation.If the hydraulic cylinder in the process of work movement out of sync phenomenon,will greatly reduce the reliability of equipment,very serious consequences,so the four cylinder synchronous electro-hydraulic system for in-depth research has very important significance.In view of the problems of the four-cylinder synchronous system,this paper makes a thorough study and concludes that the asymmetric error is the main reason for the out-of-syncmotion of the four-cylinder synchronous system.In the four-cylinder synchronous lifting electro-hydraulic system with symmetrical valve-controlled asymmetric cylinder,the error fluctuation of the four hydraulic cylinders in the process of stretching out and retracting in the system is analyzed by simulation.The idea of its four-cylinder coupling control is that the input signal of the controller at a certain time should not only consider the following error of itself,but also the error between the two adjacent hydraulic c-ylinders.Because the hydraulic system is nonlinear,the fuzzy PID control algorithm is used to compensate the large error range of the synchronous system.At the same time,when the hydraulic cylinder is stretched out to retracted,the force area of its piston will change,which is bound to produce asymmetric error.Therefore,the second layer of fuzzy controller with compensation factor is used to output compensation factor to compensate the error quickly.Then,the former fuzzy PID controller is combined to form a double fuzzy control.In this paper,firstly,by means of mathematical modeling,the specific motion of the four-cylinder synchronous system is analyzed from the perspective of mechanics,and the conclusion is drawn that redundant hydraulic cylinders will appear in the operation of the four-cylinder synchronous hydraulic system.In order to overcome this problem,the transfer function of symmetrical valve-controlled asymmetrical cylinder system is derived,and the Bode diagram is drawn by MATLAB to verify its stability.Finally,AMESim and MATLA cosimulation technology wasused to simulate the dual-fuzzy four-cylinder synchronous control system based on adjacent cross-coupling,and the simulation results were compared with master-slave synchronous control strategy and the traditional control strategy of shunt collector valve.The results show that the control strategy can effectively solve the problems of four cylinders out of sync and large frequency of commutator vibration.