Research On Digital Factory Related Technology Based On Double Capacity Water Tank Control

With the introduction of Industry 4.0 and the standardization and digitization of industrial process flow,digital factories have become an inevitable trend of industrial development.This paper takes the liquid level control system as an example to study the virtual modeling,distributed data acquisition,and virtualization involved in digital factories.Control and other key technologies.The main work is as follows:By analyzing the physical laws of dual-capacity water tanks and combining the structural characteristics of dual-capacity water tanks,the mathematical models of variable-frequency water pumps and dual-capacity water tanks in the system are established respectively.Then the model parameters are introduced into the dynamic properties of virtual water tank objects to complete the entire dual-capacity water tank system.Virtual modeling,and the same input to the virtual model and the actual tank system,the error of the measured output value is ± 5%,verifying the effectiveness of the virtual tank system model.Through the Intellinet/IP and Devicenet networks in the Netlinx architecture of Rockwell's three-tier network,the values of flow,liquid level,and pressure in the dual-capacity water tank system were collected and the man-machine interface was designed to complete the acquisition of distributed data in the dual-capacity water tank system.By comparing the measured value with the theoretical value,the effectiveness of the acquisition system was verified.The level control of the virtual tank was controlled by the switching control based on the volume of the dual-capacity water tank,the Smith predictive control of the dual-capacity tank level,and the cascade control scheme of the dual-capacity tank level.By analyzing the response curve under virtual control,the effectiveness of the virtual control scheme is verified.Through the establishment of a virtual liquid level control platform,the proposed virtual modeling,distributed data acquisition and interactive control experiments of virtual and real systems are separately verified experimentally,and the control effect of the actual liquid level system response curve is analyzed and compared with the virtual liquid level control.The comparison of the response curves of the scheme shows that the switching control scheme based on the amount of substances is better,and the error between the actual response curve and the virtual curve is within 5%.Further verify the feasibility of the virtual control program.The virtual control can be implemented in the actual level controller.The problems in the actual control can in turn promote the optimization of the virtual control scheme and complete the virtual and actual interaction control.