The Study Of The Hydraulic Leveling Algorithm And Experiments In Asphalt Mortar Car

Mortar car is a key equipment during the building of frantic jumble inrapid transit railroad. With the development of high-speed railway,mortar car is more and more widely used. The quality of the franticjumble in rapid transit railroad depends on the accuracy of the ratio ofconcrete ingredients, which are measured by electronic weighingsystem in mortar car. If mortar car is at uneven state, the precision ofthe electronic system is affected. Therefore, it is important to ensuremortar car work at a even state. To solve this problem, This paper putsforward an automatic leveling system which can level the mortar carreal-time.Firstly, The hardware system of the platform is built, includinghydraulic system, control system and the peripheral devices. Themathematical model of the hydraulic system is got by combining withhydraulic mechanism and the experiments. Secondly, the parameters ofPID controller are set by using traditional method—Ziegler-Nichols(Z-Nfor short) based on the mathematical model. Then using them as theinitial value of the Particle Swarm Optimization algorithm for betterparameters which are got by using three different fitness functions.Establish the fuzzy rule base for fuzzy PID control simulation andregular PID control simulation in MATLAB platform. Finally, levelingexperiments are done by using PLC and ARM control system based ontwo kinds of leveling logics, including two-point and three-point leveling.The different comparisons are done between two-point and three-pointleveling method, PLC and ARM control system. PI and PID controlalgorithms are taken into the control system based on the leveling logicfor inner experiments, which are made comparison to the simulation andthe experiments by using leveling logic. The results can be summarized as follows through experiments andsimulation: the similarity between the identified model usingexperiments and the real model is96percent. The simulation using theparameters which are got by PSO is better than using parameters got byZ-N algorithm. It can meet the overall technical performance of themortar car using the PLC and ARM control system. The precision of theleveling system reach0.1degree. The leveling time is lower than thirtyseconds. Leveling time and stability are improved by using PIDalgorithm into leveling logic. It proves that the identified model and thereal model are identical nearly.The conclusion can be got as follows: The identification method canbe used for other hydraulic systems because it can identify the systemwell. It provides a platform for the leveling technology using ARMcontrol system. It can realize intelligent leveling using PID controlalgorithm into the system based on the control logic which can be usedin other leveling systems for vehicle.