Research On Pressure Control Of Hydraulic System For Bridge Swivel Construction Based On Fuzzy PID

Bridge swivel construction is widely used in different fields such as railways,highways,and municipal administration,and is suitable for different bridge types such as T-shaped rigid frame bridges,continuous beam bridges,arch bridges,and cable-stayed bridges.With the continuous updating of the tonnage of swivels,in order to enable the swivel construction to be applied in a wider range,the research and innovation of swivel technology has never stopped.Swivel construction is divided into horizontal rotation method and vertical rotation method.The horizontal rotation construction not only has a large rotating weight,but also can be constructed without affecting the existing operating lines.Therefore,the horizontal rotation method is the preferred method in bridge construction.The horizontal rotation system has three key components: load-bearing system,balance system and hydraulic traction system.The hydraulic traction system uses hydraulic traction jacks to provide pulling force,and hydraulic pumps provide pressure output.Although the application of hydraulic traction technology is approaching maturity,it has certain limitations such as complicated operation,low degree of intelligence,and poor precision control.Among them,pressure output response speed and accuracy are the main parameters of hydraulic system control,while pressure oscillation is the main factor affecting accuracy control.As the tonnage of the bridge rotation increases,precision control becomes increasingly significant.In order to overcome the technical shortcomings of the hydraulic traction system,the design improvement of the existing technology combined with intelligent control is of great significance for improving the construction technology of bridge swivel.This paper takes the swivel construction hydraulic traction system as the research object,optimizes its pressure control performance.In view of the existing performance shortcomings and according to the control requirements of the system,the use of fuzzy PID control method is proposed to improve the pressure output performance of the hydraulic traction system.The main research content of the article includes:(1)Aiming at the technological process of bridge swivel construction,study the working mode of hydraulic traction system in bridge swivel construction.According to the working principle of hydraulic traction jack of traction device,the electrical control part of hydraulic traction system is studied and designed.(2)Analyze the schematic diagram of the hydraulic traction system,establish a double-pump frequency conversion hydraulic system according to the hydraulic operating principle,and establish a mathematical model for each part.On this basis,the physical model of single-pump inverter hydraulic system and double-pump inverter hydraulic system are built and simulated by AMESim,and the advantages and disadvantages of double-pump inverter hydraulic system are analyzed by comparing the output performance.(3)Design the fuzzy PID controller according to the system characteristics,establish the fuzzy PID control system in Simulink,and use the AMESim-Simulink co-simulation platform for simulation verification.The programming of the fuzzy PID control is completed in the PLC(Programmable Logic Controller),the control core of the hydraulic traction system,and the system is tested for operation,and the operation data is collected using the WEINVIEW touch screen as a monitoring system.The output data of the hydraulic traction jack under PID control and fuzzy PID control were obtained through experimental runs.According to the comparison analysis of pressure output curve and displacement output curve,the amplitude of pressure oscillation under fuzzy PID control is reduced relative to PID control 38.93%,and the pressure response speed is accelerated 7.91% the displacement response speed is improved 10.94%,which verifies the superiority of the designed fuzzy PID control in hydraulic traction system.