双变量施肥液压调速系统的设计及仿真

Design and Simulation for Hydraulic Sleepless Speed Regulation System of Bivariable Fertilizing Application

为了实现精准施肥,提高双变量施肥液压调速系统的稳定性,设计了基于PLC与液压马达的双变量液压无级调速变量施肥系统。以液压油路的稳定性和排肥槽轮机构驱动控制方法为研究重点,建立了数学模型和液压系统仿真模型。为了更好控制施肥精度,在液压油路中增加了液压稳压环节和液压压力传感器;根据数学模型,采用PID控制算法对传动误差进行补偿,并在不同PID控制参数下对系统进行仿真。通过分析比较,该仿真结果符合实际运行情况,对双变量施肥液压调速系统分析和实验有一定的理论指导意义,并当PID的参数为Kp=10,Ki=0.08,Kd=8时,液压马达转速输出曲线可以满足精准施肥的精度要求。

A hydraulic sleepless speed system was proposed for a bivariable fertilizing application based on PLC,in order to en-hance the stability of the hydraulic sleepless speed system and eventually achieve precise fertilizing. With particular emphasis on the stability of the hydraulic circuit and the actuation control method,mathematical model and simulation model for hydraulic sleepless speed system were established. More specifically,hydraulic sleepless speed system with stable oil circuit and oil pressure sensor was designed to ensure hydraulic system stability,while PID control algorithm was employed to compensate transmission error according to the mathematical model. The hydraulic sleepless speed system was then simulated in different PID control parameters. Simulations show that the results are reasonable and applicable,providing some theoretical guidance to the characteristics anticipation and test of hydraulic sleepless speed system. It is also found that when the PID parameter is chosen as Kp =10,Ki = 0.08,Kd =8,the fertilizing precision will be satisfied.