外文翻譯--基于controllogix5550 plc的鍋爐水位控制系統(tǒng)

1、1中文 中文 2710 字Boiler level control system based on ControlLogix5550 PLCAbstract-This paper is a research design based on EFPT process control device. In the design, actual industry field has been simulated and correspondi

2、ng modeling has been carried on for the boiler level system. Then the appropriate PID parameter has been sorted out and ControlLogia5550PLC has been used to control the entire boiler level system.At last, a correspondi

3、ng control interface has been established and the boiler level has been under a safe and accurate controlKeywords：EFPT，PID，Modeling，Boiler level;1 IntroductionThe task of the industrial boiler level control is to

4、maintain a dynamic balance by controlling the water flow and evaporation, so that the drum level can be maintained in the technological level, which is a necessity for ensuring safe operation and also one of the main ind

5、icators of the boiler's normal operation. Water level which is too high will affect the effect of the steam-water separation, but too low it is will break ring cycle or even cause boiler explosion. To ensure a safe a

6、nd efficient production, the boiler level must be strictly controlled in maintaining constant or changing only according to a certain rule. Using Logix5550 PLC with analogy I/O modules, launched by Rockwell Automat

7、ion Company as controllers, and EFPT process control experimental device as control object, this system have brought the boiler water level under an accurate control in a mini boiler system with sensors and actuators

8、 that used in industrial production.3In the design, the inverter as an actuator directly receives PLC analogy I/O port output, and converters into frequency of inverter so as to drive the 3-phase motor in the lift pump,

9、change the inlet, and adjust the boiler level to the dynamic balance at last. And the configuration software is used to design monitoring picture to realize the computer and the touch screen to the boiler level long-dis

10、tance and the scene monitoring. 3 Establishing Mathematics model for the charged objectOne of the main tasks of establishing control system mathematical model is to determine the mathematical model of th

11、e controlled object. Generally, there are two kinds of basic methods for establishing process control mathematical model: mechanism analysis and experimental method. However, for controlled object whose structure

12、and internal process is very complex, it is very difficult to determine the object just by its own internal physical process and to solve out the differential equations systematically. Besides, considering the nonlinear

13、 factor, mechanism analysis used some approximation and hypothesis for mathematical deduction. Although these approximation and assumptions have practical basis, but not fully reflect actual situation, and even cause inc

14、alculable effects.Therefore, in this design, the experimental method is chosen to establish a mathematical model for controlled object. This kind of modeling is based on the input and output in the actual production proc

15、ess, that is to say, establishing mathematical model for the controlled object through process identification and parameter estimation. In this design, step response curve method is used to identify mathematical models o

16、f the process. A 20Hz step disturbance input signal is applied to the charged object, and the response curve of the output that changes with time can be mapped. After the analysis, the transfer function of the cont

17、rolled object can be defined. In the process of experiment, the object was conducted several tests. Using RSLogix5000 trend monitoring function curve, more than 10 charged object step response curve have been recorded. T