Multi-function Testing Of The Engineering Machinery Control Program Design And Simulation Of The Loading System

Construction machinery multifunction experimenting platform is a newly-built synthetic construction machinery experimenting equipment in Chang'an University , which adopts advanced technologies of secondary adjusting loading and the distributed control system , to meet the researching needs of the working equipment of construction machinery and traction performance.Firstly, the experimenting platform was introduced as a whole in the paper, then the principle of secondary adjusting technology and domestic application were introduced , the similarities and difference were found comparing with other secondary adjusting loading equipment.Secondly, control system of experimenting platform was specially analyzed for further understanding . According to the needs of controlling , the processes of constant velocity control and loading control were particularly deduced.Thirdly , PLC is the core of whole control system. Based on comprehensive understanding to Simens S7-300 PLC , according to the control requirement and the processes of constant velocity control and loading control which were deduced in chapter 2. PLC control program was programmed by using software STEP7 and ladder diagram language. PLC control program basically achieved control requirement by program debugging.Finally , the mathematical model of secondary adjusting loading system was set up and simplified. Pointing at nonlinear of secondary adjusting loading system , fuzzy auto-tuning PID mathematical model was set up and simulated by using Matlab/Simulink software. Simulation results implied that output dynamic response performance of secondary element improved greatly by adopting fuzzy auto-tuning PID control, the results attained expect aim .