| Hydraulic dredge is important and indispensable mechanism equipment in all sorts of dirt and stone work. It has extensive application in industry, civil building, traffic transportation, hydraulic engineering, opencast mining and modern military project. It's stable hydraulic system and regular movement are important to ensure the project to operate with safely and efficiently. To control the contamination degree of working substance in hydraulic dredge is a key technique to ensure its stable movement.This thesis sets up the mathematical model of the hydraulic dredge contamination control system aimed at the structure,operational principle and run character of the contamination control system of the hydraulic system. Through the analysis of the grade of oil cleaning degree of the hydraulic element, it obtains the evaluation criterion of the contamination grade, which is adopted in dredge hydraulic system, and chooses particle counter to monitor online the contamination degree of hydraulic system.The thesis applies the fuzzy control theory to control the contamination degree of working substance of the hydraulic dredge. It chooses the contamination degree of working substance and the control current of the self clean device motor as the input or output variable language of the fuzzy controller. With the using of the fuzzy control theory, these physics variable will be switched from physics precise field to language fuzzy field. And the variable cost of the fuzzy controls input or output language and the subjection function will be established. After the fuzzy discursion, we will have the control formula table of the fuzzy control. At the same time, the thesis puts forward the software and the hardware scheme of the fuzzy controller in contamination control system of the hydraulic dredge, and makes the simulation research for the system. |
PDF Full Text Request