Mathematical Model Analysis And Control Strategy Research Of Water Tank Level Control System

Liquid level control is widely used in many industries such as steel,petrochemical,food filling,pharmaceutical,power station,etc.It is an important part of industrial automation.The four-capacity interconnected water tank liquid level control system is a type of multi-input and multi-output control object,which has characteristics of nonlinearity,time-varying,large inertia,hysteresis,and coupling.The experimental design provides a good environment.In-depth and detailed mathematical model construction and design of control schemes can provide a basis for the design of further experimental devices and experimental schemes.This paper is based on the MIMO multi-input multi-output four-capacity interconnected tank liquid level control system,mainly doing the following work:(1)through the conservation of materials,Bernoulli equations and Taylor series expansion,etc.,the linearized mathematical model is obtained,And then discuss the impact of system operating parameters on system performance;(2)For the SISO single-input single-output three-capacity water tank system obtained from the four-capacity water tank variant,design traditional PID control,fuzzy control,fuzzy PID control,and feedforward feedback composite Control strategy;(3)For the TITO dual-input dual-output four-capacity water tank,the LQR controller is designed,and the inverse Nyquist analysis method in the multivariate frequency domain analysis method is used to analyze the diagonal predominance of the system after the pseudo-diagonalization process Performance,and compare the system step response output before and after introducing the pre-compensation matrix.This paper analyzes and discusses the mathematical model of the water tank system,and the control strategy for SISO and MIMO systems improves the control level of the system.It can be applied to general industrial control systems,and has wide application value and high practical significance.It also provides specific and feasible control schemes for the further establishment of the four-tank experimental system,especially the MIMO controllability,observability and detailed design of the control scheme based on the four-tank system,which establishes a solid foundation for the experiment.