Analysis Of Performance On Distributing System Of Liquid Snow-melting Agent

Based on the review of the development status, the existing problems and researchorientation of the snow-melting agent distributing and its related technology at home andabroad, a distributing system of liquid snow-melting agent was put forward. A systemimplementation scheme convenient for engineering application was determined by thecomparative analysis of different spraying control methods and transmission system. Thedistributing quality mainly depends on the performance of pipeline system and control systemof speed regulating. These two aspects were mainly analyzed in this thesis.The calculation and analysis of the pipeline system should be done in order to study andimprove the distributing uniformity of transverse and longitudinal. Firstly, the pressure lossbetween pump discharge and the nozzle exits and the frequency characteristics of a simplifiedmodel were obtained by theoretical calculation. Secondly, the simulation model of thedistributing pipeline system was established using AMESim platform. The dynamic responsesof the press and flow rate of the nozzle were studied in the paper when the pump revolutionspeed and the quantity of the working nozzles varied. Finally, the influence rules of thepipeline parameters on the system’s dynamic and steady-state response performance wereobtained by a series of parametric analysis of the pipeline model.In order to maintain a relatively stable spray volume, the pump flow should be adjustedtimely to adapt the random fluctuation of the vehicle speed. The mathematical model of theinitial speed regulating system and the simulation model without any control were establishedusing MATLAB/Simulink. The simulation results showed that the steady-state error of thesystem was too large, and the retardation time was too long. Another results showed a zerosteady-state error when using the classical PID control for the system, but the retardation wasstill bigger than the required. In order to make further improvement of the system’s dynamicperformance, a double-stage online tuning fuzzy-PID controller was designed and anoptimization control effect of the speed regulating system was obtained by simulation.In order to overcome the one-sidedness of single pipeline system analysis and singlespeed regulating system analysis, the coupling simulation model was established by using the software interface between AMESim and MATLAB/Simulink. The speed regulating systemshowed timely adjustments depending on the feedback signal of torque from the pipelinesystem. The simulation results showed that the distributing system presented good dynamiccharacteristics by using the fuzzy-PID controller.