| With the significant expansion of China's packaging market,flexographic printing technology has become the focus of research because of its use of green ink.The flexographic printing press adopts the electronic control synchronization method without shaft,which has the advantages of high precision,simple structure and convenient adjustment compared with the mechanical transmission method in the past.After the study of many scholars,the performance of the system has been relatively stable when it runs smoothly,but the performance still needs to be improved in the dynamic processes such as acceleration and interference recovery.Therefore,this paper will study the multi-motor synchronous control system of flexographic press to improve its synchronous following performance and the ability to resist load disturbance.(1)The printing principle and historical background of flexographic press are introduced.The research status and development trend of permanent magnet synchronous motor and multi-motor synchronous technology are introduced.The main research problem and research direction are determined.(2)This paper introduces the classification and working principle of flexographic press,and analyzes its overall structure and its internal unwinding,printing and rewinding modules.A multi-motor synchronous control scheme for flexographic press is designed.The permanent magnet synchronous motor used in flexographic press is controlled by servo drive,and the mathematical model of the motor is established.For the control structure of multiple motors,a deviation coupled synchronous control method is adopted,and a system model is established.(3)Aiming at the problem of large error of overharmonic tracking when PMSM is started under the control of traditional PID method,a method of setting PID parameters by pigeon swarm particle swarm optimization(PIO-PSO)is designed.The traditional particle swarm optimization(PSO)algorithm is introduced,and its learning factor is improved,so that it can change according to the fitness value.In addition,pigeon swarm algorithm is introduced to improve the ability of the particles to get out of the local optimum,and some particles are given the ability to jump to find the optimum,so as to form a new pigeon swarm particle swarm optimization algorithm(PIO-PSO).Then,the fitness function was set up according to the system deviation,K_P,K_Iand K_Dwere initialized,and the solution with the smallest deviation was iteratively searched by the particle swarm optimization algorithm of pigeons,so as to dynamically adjust K_P,K_Iand K_D.The simulation results show that this method can reduce overshoot and tracking error.(4)Aiming at the problem that the traditional control structure has poor following performance and weak anti-disturbance ability,which cannot meet the needs of the flexographic press synchronization,an improved deviation coupling speed compensation multi-motor synchronous control structure is adopted.On the basis of the traditional fixed feedback amplification gain,PI control algorithm was used to optimize it,and pio-pso was used to optimize and set its parameters.The fitness function ITAM was set up according to the system error,and K_Pand K_Iwere dynamically adjusted by using the pigeon swarm particle swarm optimization algorithm to speed up the synchronous recovery speed between the motors.When the system is out of sync due to load interference,the synchronization error can be reduced quickly and the system stability can be improved.(5)Through the simulation modeling analysis,the synchronization performance of the multi-motor synchronization system with traditional deviation coupling control method,PI optimization deviation coupling control method and pigeon flock particle swarm optimization PI optimization deviation coupling control method is compared under the same motor control strategy.By comparing the performance of three control methods under the same load interference,the superiority of this method is proved. |
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