模糊控制在工业转窑温度控制中的应用

温度是工业中三大过程变量值之一,在工业过程中,恒温控制系统尤为常见。工业中的实际系统大多具有非线性、不确定等特性,基于模型的经典控制理论和现代控制理论难以适用,而采用智能控制方法会取得较好的控制效果。以某厂工业转窑温度控制系统为例,介绍应用比较成熟的模糊控制方法,取得较好的控制效果。     

基于CAD/CAM的旋转隔板转动环数控仿真加工技术分析

在汽轮机中,旋转隔板主要起着调节抽汽量和凝汽量比例的作用。转动环作为旋转隔板的重要零件,其具有结构复杂,窗体数量多等特点,因此加工具有一定的难度。本文以旋转隔板D60D- 113000A为例,介绍了其转动环的结构特点及数控加工工艺方案,并在CAD/CAM基础上深入分析了其数控仿真加工技术,为旋转隔板的数控仿真加工提供了相应的技术参考,其工作流程也可用于其他类似零件的数控仿真加工中。     

YDC-168型旋冲钻井工具工作原理与现场应用

针对吐哈油田在深井钻井过程中,特别是遇到研磨性强的硬地层时钻井钻速低的问题,吐哈钻研院根据该油田的地层特点研制出了YDC-168型旋转冲击钻井工具。研究及实验结果表明,YDC-168型旋转冲击钻井工具对于研磨性强的硬地层机械钻速的提高具有一定效果,较好地解决了在钻井过程中遭遇研磨性强的硬地层钻速低的问题,对进一步研究具有指导意义,有良好的市场开发前景。     

SAS变换回归与二次回归通用旋转组合设计

阐述变换回归分析的基本原理,并应用SAS对回归旋转正交设计试验数据作统计分析。比较表明,SAS变换回归分析的结果与普通二次回归通用旋转设计的统计分析结果非常吻合,但是变换回归更加灵活直观,在未知非线性函数的信息场合,它是探索变量间非线性关系的锐器。     

Consolidation of Pursuit Rotor Learning under Conditions of Induced Arousal

Abstract

The purpose of this investigation was to test the basic tenets of consolidation theory by studying the relationship between arousal and the performance and learning of a pursuit rotor task. Ninety-six subjects (48 men and 48 women) were randomly assigned to one of three induced arousal conditions (control, failure-feedback, and electrical shock). Subjects were given twenty-one 20-second acquisition trials under induced arousal conditions, followed 24 or 48 hours later by nine trials in the absence of induced arousal (trials 22–30). The Spielberger A-trait test was administered before the 21 acquisition trials and the A-state test was given afterward. The results of the A-trait test revealed that arousal conditions were equal in terms of normal anxiety levels, while results of the A-state test demonstrated that subjects under induced arousal conditions were indeed stressed (had higher levels of state anxiety). The 21 acquisition trials (seven three-trial blocks) were analyzed using time on target (TOT) scores to determine the effects of arousal on performance. The results of this analysis revealed reliable differences for sex and trial blocks, but not for arousal. A significant triple interaction among the three main effects was primarily caused by a decrement in performance by the female subjects who received failure-feedback. TOT recall scores failed to reveal a facilitative effect due to arousal as predicted by perseverative consolidation theory. In summary, the results of the investigation provided partial support for the action decrement notion but none for the action increment notion of consolidation theory.     

转子压缩机过载保护器的优化匹配

文章介绍了转子压缩机目前常用的外置过载保护器的工作原理、关键参数,结合试验情况,对选配的方法以及如何优化匹配进行了详细的研究总结。     

滞回比较器的输出波形图对吗?——与清华大学杨素行教授商榷

本文阐述了两种滞回比较器的差异 ,认为教材中的输出波形图画得不妥。     

同频四通道旋转关节研究

研究了一个同频四通道旋转关节,一路高功率通道作为雷达和通道,一路低功率通达作为雷达差通道,另两路低功率通道作为雷达对消信号通道。设计了旋转关节的结构,分析了其主要参数的选取以及设计方法,并给出了测试结果,结果表明:其带宽可达到13%,电压驻波比均小于1.27,插入损耗小于0.63dB,设计结果满足相关要求。该旋转关节已用于研制的某型号雷达,实际使用效果良好。     

基于一种新型海水液压泵的动力学分析

通过对海水泵系统等效力学模型的构建,描绘出系统从启动到停止全部三个过程海水泵系统的动力随时间变化的规律。建立以回转运动的斜盘为等效构件,以斜盘的摆角作为广义坐标求解所得出的等效转动惯量与等效力矩所构成的等效力学模型,进行动力特性分析。并通过等效构件有效地将整个系统动力特性折算到等效构件上,求解出三个阶段海水泵系统的动力特性。     

回转窑窑体窜动的原因分析及解决措施

针对回转窑在使用过程中出现的窑体窜动问题,从回转窑的组成入手,分析窜动原因,提出通过托轮调整解决回转窑窑体窜动的方法和调整时的注意事项。