Research On Active Disturbance Rejection Contro Of Glue Dosing Of Particleboard

With the increase of particleboard production capacity and the development of glue dosing technology in China,higher and higher requirements are put forward for the particleboard glue dosing control system.The particleboard glue dosing process is a complex control object with non-linearity,time lag and uncertainty,and different degrees of parameter uncertainty and unpredictable external disturbances are inevitable in the actual production.However,the influence of interference on the accurate ratio of particle to glue dosing quantity,glue dosing uniformity and product quality cannot be ignored.This makes the design of particleboard glue dosing control systems become one of the key areas in glue dosing technology.The active disturbance rejection control(ADRC)method has the feature of not relying on the model parameters of the controlled object,and can estimate and compensate the uncertainty of the model parameters and the external disturbance as the total disturbance in real time,which has received wide attention from scholars and engineering circles at home and abroad.In this paper,the active disturbance rejection control method is applied to the particleboard glue dosing process,aiming to improve the performance of the glue dosing control system in terms of dynamic characteristics,robustness and anti-disturbance,with the following main research work:To reveal the uncertainties and sources of disturbances in the glue dosing process,and to analyze the control mode and operating characteristics of the glue dosing pump,which is the main link in the particleboard glue dosing process.The analysis shows that the change of glue dosing pump working point will cause the change of outlet pressure,and there is pulsation of outlet pressure of glue dosing pump under the frequency conversion constant pressure control mode,which affects the stability and control accuracy of output adhesive.Uncertainty of the model parameters due to the environment and the characteristics of the equipment itself.The mathematical model of the glue dosing system was constructed and improved,laying the foundation for the application of subsequent control strategies.A particleboard glue dosing active disturbance rejection control(ADRC)strategy is proposed for the uncertainty of the particleboard glue dosing process model and the unknown applied disturbance problem.The tracking differentiator(TD)and the expanded state observer(ESO)are designed using the fastest integrated function fhan()and the fal()function,respectively,and their convergence is proved,while stability analysis of the closed-loop system is performed by applying stability theory.The influence of the selection of the parameters of the ADRC controller on the performance of the control system is analyzed,and the parameters of the ADRC controller for the glue dosing process are rectified by combining the empirical method.The comparison of simulation experiments shows that the ADRC control method improves the dynamic performance and anti-disturbance performance of the particleboard glue dosing control system and enhances the robustness of the system.A non-singular terminal sliding mode active disturbance rejection control(NTSMCADRC)strategy is proposed for the convergence speed problem of particle board glue dosing control system.non-singular terminal sliding mode self-tampering controllerThe design of NTSMC-ADRC focuses on the fast convergence and jitter of the nonsingular sliding mode control law.Combining the double power convergence law and introducing ?(s)functions to improve the control law,a sliding mode extended state observer is designed and the asymptotic stability of the system is proved by applying the Lyapunov function method.To analyze the effect of inertia weights on the global search ability and local exploitation ability of the particle swarm optimization(PSO)algorithm for the problem of more parameters to be rectified.The ratio of the global optimal fitness of a particle to the average of the local optimal fitness is used to determine the inertia weights and optimize the effect of controller parameter tuning.Simulation results show that the NTSMC-ADRC strategy leads to faster convergence and better dynamic performance of the system compared with the ADRC control method,which verifies the effectiveness of the method.The PI?D? active disturbance rejection control(PI?D?-ADRC)strategy is proposed for the control accuracy problem of particleboard glue dosing system.A PI?D?-ADRC controller is designed and the effect of the selection of the parameters of the PI?D?-ADRC control law on the dynamic performance of the system is analyzed.An input delay PI?D?-ADRC control method is proposed for the time lag problem in practical production.For the parameter rectification problem,the adaptive particle swarm optimization(APSO)algorithm is improved by using the diversity enhancement mechanism of inertia weights and the mutation threshold strategy,and then the parameters of the PI?D?-ADRC control system are optimized.Simulation results show that the improved APSO algorithm has better global search capability and local exploitation capability,and the proposed control method has higher dynamic performance and control accuracy compared with the ADRC method.