变尺高精度全自动矽钢片剪切机控制系统设计

为满足矽钢片剪切机工艺精度要求，用三菱FX2系列PLC作为主控单元，与定位模块、伺服放大器及MR—J2系列伺服电动机组成控制系统。利用伺服电动机所具有的位置控制和多段速度控制的特点，通过表定位方法对定位模块进行操作从而实现对电动机的精确定位，并推导出位置、速度双重控制的最优方案，既提高了剪切精度又使该系统达到理想的剪切速度。系统实现了变尺剪切，达到了特种变压器的装配要求。     

基于Seekur的农田机器人激光避障设计与仿真

以农业机器人为代表的新型智能农业机械装备的开发已经成为现代农业领域研究热点之一。为了探讨农田环境下机器人作业时自主避障问题,设计了基于Seekur机器人平台的自主避障系统,由激光传感器、WRAP wifi interface和远程监控PC组成;通过分析农田环境中避障应用需求,设计了模糊逻辑算法避障策略。通过在Mat Lab中的模糊逻辑仿真和Mobile Sim中的避障过程仿真,验证了模糊逻辑避障算法具有较好的避障效果。     

Research on Reliability of Water Delivery Pipeline System

In this paper,the reliability calculation models of water delivery pipeline system with setting up communicating tubes are studied by net decomposition method.The calculation results show that the reliability of water delivery pipeline system may be lowered or increased with increment of the communicating tube number,and the influence of reliability variety of tubulation of delivery main pipeline and T branch pipe is a sensitive factor influencing the reliability of the system.Therefore,the research results have the important leading meaning to the design,the choice of subassembly,the construction installation,maintenance management of the water delivery pipeline system,and looking for path with the biggest reliability of the system.     

Fuzzy Control of Vehicle Semi- active Suspension System via Magneto- rheological Fluid Damper

A quarter - car suspension system in which the MR fluid dampers are used as the semi - active control actuators has been proposed and developed based on the theory analysis of MR fluid dampers characteristic. A adaptive fuzzy logic controller is developed. The completed system is simulated via SIMULINK Toolbox of MATLAB 6.1. Compared to the passive suspension system and simple fuzzy logic controller, the adaptive fuzzy logic controller markedly reduces the vertical acceleration of the sprung mass and effectively improves ride comfort of automobile.     

槽式太阳能跟踪控制系统的研制及应用

目前在太阳能热发电领域,仅有槽式太阳能实现了商业发电,但是槽式太阳能需要实时进行太阳跟踪。为了提高槽式太阳能跟踪精度,该文研制了一种基于可编程逻辑控制器PLC的太阳自动跟踪系统,并采用视日运动轨迹算法主动式跟踪策略,计算出槽式太阳聚光器跟踪太阳的旋转角度,并用该角度产生控制指令驱动液压油缸,实现对南北布置东西跟踪的槽式太阳能聚光器的精确太阳跟踪,选取了4个典型日期分析该跟踪系统在4个典型日期时太阳位置的高度角、方位角、跟踪太阳的旋转角度以及聚光器的旋转角度等数据,研究聚光器的运行特性。应用结果显示,该跟踪控制系统计算的太阳位置算法与国际上比较先进的高精度太阳位置SPA计算算法之间的误差在0.12°以内,角度传感器的变送误差在0.044°以内,间歇跟踪驱动最大误差在0.4°以内,经过现场测试整个跟踪系统的误差在0.5°以内。同时,对聚光器的运行轨迹数据分析显示抛物槽式聚光器的全年最大运行速率出现在冬至日的正午时刻,达到0.398°/min。该研究可以为抛物槽式太阳能聚光器的传动机构设计提供理论依据。     

可编程序控制器在粮库自动化系统中的应用

采用可编程序控制器（ＰＬＣ）实现自动化粮库仓储、输送系统的数个工艺流程的控制，介绍了用控制系统流程框图（ＣＳＦ）语言编写顺序控制程序的方法。     

基于神经网络的自适应模糊控制器

提出了一种基于神经网络的自适应模糊控制器。控制器由一个模糊神经网络和一个人工神经网络组成,具有自适应和自学习能力,计算机仿真实验证明了这种控制器的有效性,控制性能优于常规的模糊控制。     

建国以来工业化、信息化、城镇化和农业现代化同步推进的历史进程与发展趋势探析

"加快实现农业现代化,并充分发挥信息化对工业化、城镇化和农业现代化的支撑作用,实现工业化、城镇化、农业现代化和信息化协调发展",是新时期现代化建设的整体思路。建国以来我国工业化、信息化、城镇化和农业现代化同步发展有鲜明的历史特色和阶段特征,"四化"同步的演变随政府策略变化而发展。"四化"之间的相互影响和相互促进关系表明,"四化"的同步协调发展具有规律性、阶段性和趋势性,是中国现代化建设的必要过程。     

基于模糊逻辑的新生心理健康评估专家系统的设计与实现

在研究了几种评估方法的基础上,提出了模糊评估与层次分析相结合的综合评估方法,并基于建立专家系统的基本设计思想,开发了一个基于Web的新生心理健康评估专家系统。针对新生所表现出的心理症状和潜在心理信息对新生存在的心理问题进行了诊断研究,为新生教育及管理提供了有价值的信息。     

Evidence of fishery depletions and shifting cognitive baselines in Eastern Indonesia

We analyzed fisher interview data collected in the Raja Ampat archipelago of Eastern Indonesia to demonstrate a perceived decline in the abundance of living marine resources targeted by commercial and artisanal fisheries. The decline appeared ubiquitous among all tested species and a clear trend emerged in which older fishers recall greater past abundance than younger fishers. This provides evidence for the shifting baseline syndrome, a dangerous cognitive condition in which each generation of fishery stakeholders accepts a lower standard of resource abundance as normal. We used a fuzzy expert system to standardize and quantify the anecdotal evidence, and combine it with additional depletion indicators to produce a decadal time series of resource abundance from 1970 to present. Using governmental catch-per-unit-effort data from more recent years we hindcasted to establish an absolute scale with which to interpret the perceived decline. The interview information suggested that some exploited species may have declined by as much as an order of magnitude since 1970.