连续流粮食干燥控制系统变量分析与结构设

针对粮食干燥影响因素多且不确定,以及测量结果存在滞后的问题,提出了连续流粮食干燥被控变量和控制变量的选择方法,通过实验数据对影响粮食干燥过程的各因素及各因素对粮食出口含水率的灵敏度进行了分析.结果表明,影响较大的因素有排粮电动机转速、热风温度、粮食初始含水率,影响较小的因素有环境温度、热风和冷却风风量、粮食初始温度.设计了连续流粮食干燥过程自动控制系统的控制结构,引入微分环节可有效抑制因测量而造成的滞后现象.

Analysis and Structural Design on Automatic Control System of Continuous Flow Grain Drying

Aiming at solving the problem in grain drying,with many uncertain influence factors,that the measurement results hysteresis exists,the selection approach was presented on both the controlled and control variables of the continuous flow grain drying.Based on experimental data,factors affecting grain drying process and multiple factors sensitivity affecting grain outlet moisture content were analyzed.The result shows the major factors influencing the grain outlet moisture content sensitivity are discharge mot...