谷物烘干机前馈加反馈智能PI控制系统

该文论述了智能PI控制算法,以8098单片机为核心组成前馈加反馈智能PI控制器,对烘干机出粮水分进行在线控制。通过对京411小麦的在线烘干实验证明智能PI控制算法用于烘干机出粮水分控制是可行的。     

Field evaluation of synthetic sex pheromone traps for the cocoa mirid Sahlbergella singularis (Hemiptera: Miridae)

BACKGROUND: Field trapping experiments were conducted to evaluate the attractiveness of five different pheromone blends as well as the impact of trap design on attractiveness towards cocoa mirids, Sahlbergella singularis Hagl. and Distantiella theobroma (Dist.), in Cameroon. RESULTS: A total of 361 adults of S. singularis (359 males and two females) were caught. The highest numbers of mirids were found in traps with pheromone blends that combined a monoester and a diester, compared with traps with the diester or the monoester individually and control traps with no pheromone. Rectangular traps caught significantly more mirids compared with delta traps. The mean number of 5.1 mirids trap^?1 year^?1 caught in rectangular traps was significantly higher compared with the 1.8 mirids trap^?1 year^?1 for the delta traps. CONCLUSION: The data revealed that rectangular traps containing pheromone blends combining both the monoester and the diester have a good potential to lure and trap adult males of S. singularis on cocoa farms. The pheromone blends used were specific for S. singularis, and the use of pheromone traps appears to be a promising strategy for incorporation into integrated pest management strategies for the monitoring or even the control of S. singularis in cocoa plantations. Copyright © 2011 Society of Chemical Industry     

顺流式谷物烘干机的模糊控制系统

介绍了如何把模糊控制算法应用于谷物烘干机出粮水分的自动控制系统。设计了一种以89c51单片机为核心的智能模糊控制器,给出了系统的整体结构的硬件实现电路及软件设计思路。通过对小麦的在线烘干试验证明该系统实时性好,控制精度高     

一种在线检测谷物干燥机出粮含水率的方法

提出了用介电损失角测量谷物含不率的方法，设计了适合于在线使用的传感器和自动检测系统，并用于谷物干燥机出粮含水率的在线测试，由说４１１小麦的实验发现，其含水率与介电损失角呈分段线性关系，对传感器的多次标定发现，其最大误差小于０．５％。     

基于介质损耗因数的粮食水分测量方法

为了能够在粮食的收购、干燥、储存过程中，快速、准确的测量粮食水分，根据电容器的电特性受介质影响的原理，提出了用介质损耗因数测量粮食水分的方法。给出了以AT89C52单片机为核心的粮食水分测试系统的硬件结构组成，采用相敏检波正交分离法测量介质损耗因数。通过对传感器的标定并对测试数据进行相应的回归处理，得到了介质损耗因数和粮食水分的函数关系。通过对山融1号小麦试验结果表明，该方法重复性好，测量精度高，水分含量在13%～26%范围内，最大误差小于0.5%。