基于Adaline的数控系统位置控制器研究

针对机床数控系统进给位置控制的性能要求,必须根据其工作方式和误差情况实行变增益控制策略,才能较好地兼顾动态和静态指标,为此,选用自适应线性神经元(Adaline)代替原有的比例环节,可以获得相应的控制性能。经数字仿真和实际使用表明,在数控系统中引入人工神经网络控制思想是合理可行和有效的,并且还可以进一步通过硬化实现,达到实时在线控制的目的。     

High accuracy path tracking for vehicles in presence of sliding: Application to farm vehicle automatic guidance for agricultural tasks

When designing an accurate automated guidance system for vehicles, a major problem is sliding and pseudo-sliding effects. This is especially the case in agricultural applications, where five-centimetre accuracy with respect to the desired trajectory is required, although the vehicles are moving on slippery ground. It has been established that RTK GPS was a very suitable sensor to achieve automated guidance with such high precision: several control laws have been designed for vehicles equipped with this sensor, and provide the expected guidance accuracy as long as the vehicles do not slide. In previous work, further control developments have been proposed to take sliding into account: guidance accuracy in slippery environments has been shown to be preserved, except transiently at the beginning/end of curves. In this paper, the design of this control law is first recalled and discussed. A Model Predictive Control method is then applied in order to preserve accuracy of guidance even during these curvature transitions. Finally, the overall control scheme is implemented, and improvements with respect to previous guidance laws are demonstrated through full-scale experiments.     

Control of Titanium Alloy Thin Plate Welding Distortion by Trailing Peening

The technology of trailing peening is a kind of promisingly bran-new technology which can be used to control weldingstress and distortion of Ti alloy thin plate. Control of TC4 Ti alloy thn plate welding stress and distortion underthe condition of convent     

鹰嘴岩隧道软弱破碎岩体的开挖与施工

渫水皂市水利枢纽左岸上坝公路鹰嘴岩隧道围岩主要为Ⅱ、Ⅲ、Ⅳ、Ⅴ类围岩，地质条件复杂，成洞条件差。在隧道施工中，遵循“短进尺，弱爆破、少扰动、早支护”的原则，及时进行监控量测，采取有效的加固措施，取得了良好效果，确保了工程进度与安全。     

后浇带质量控制的措施

后浇带起着超长建筑的温度伸缩、高层建筑高层部分与裙房间沉降缝的作用,已普遍采用,但有些工程由于施工不当,设了后浇带起不到应有作用,本文就施工中如何采取有效措施,对后浇带的质量进行控制,作了探讨,以期能真正发挥后浇带的作用。     

现场总线技术的特点及其在热电站的应用

阐述了现场总线技术的含义、主要特点和优点,对比了现场总线控制系统与DCS系统的区别,介绍了现场总线技术在洛阳石化分公司热电站的典型应用及其发展前景。     

二氧化碳与磷化氢混合熏蒸防治储烟害虫试验

目前,储烟害虫防治普遍采用磷化铝片剂常规熏蒸法,磷化铝施用量为6～9g/m3,安全上存在一定的隐患。为了减少磷化铝用药量,于2003年应用微电脑控制的仓外混合熏蒸机,施用钢瓶装液化二氧化碳和56%磷化铝片剂,进行了二氧化碳与磷化氢混合熏蒸杀虫试验,以8g/m3磷化铝常规熏蒸法为对照。试验结果表明,磷化铝施用量为2.3g/m3、二氧化碳施用量为12g/m3,混合熏蒸结果达到100%杀死害虫。与对照相比,杀虫效果相同,混合熏蒸法具有磷化铝施用量较小、较为安全和有利于减少污染等优点。     

原料磨同步机励磁装置的改造

分析原料磨同步机所使用的KGLF型励磁装置在实际运行中存在的问题，介绍采用LZK-3型微机励磁装置的改造实践。     

以循环移位控制为基础的相控阵天线快速测量方法研究

为了解决相控阵天线快速测试问题,本文研究了一种相控阵天线测量的新方法。该方法中相控阵天线和测试探头均不动,利用相控阵天线中各移相器的移相状态可循环移位控制的特点和相控阵天线一些已知可信的信息,从而使测量具有极高的效率。文中对一相控阵天线模型采用该测量方法的测量全过程进行模拟,验证了该方法的正确性和高效性。     

LonWorks总线在锅炉模糊控制系统中的应用

采用LonWorks总线技术可以提高锅炉控制系统燃烧效率及可靠性、保证环保要求、降低成本、优化网络的热量分配。尤其多台锅炉通过LON总线联网运行能够合理分配负荷,从而达到提高工作效率的目的。