基于CAN总线的交流电动机在线监控系统

为了实现高可靠性现代拖动系统,文章作者提出了一种基于CAN总线技术的交流电动机在线监控系统设计方案,实现了电机远程监控与多电机群控功能,同时给出了系统结构框图、关键硬件电路原理图以及主要软件模块的程序流程图。     

复杂地层梳状定向长钻孔在区域瓦斯治理中的应用

针对贵州毕节地区某煤矿瓦斯治理预抽时钻孔抽采距离短、成孔性差、孔内事故频发等难题,提出在某煤矿采用底板穿层梳状定向长钻孔的技术方法。通过优化钻孔布孔形式、布孔层位和分支孔施工工艺,保证钻孔主孔成孔深度和分支孔见遇煤层率。试验期间,施工钻孔主孔深度均大于600 m,分支孔见遇煤层率达到60%。钻孔成孔明显得到改善,单孔最大瓦斯抽采浓度达到85%,最大瓦斯抽采纯量达到2.5 m3/min,同时节省了施工成本,为毕节矿区瓦斯治理提供了新的方案。     

基于广域网的遥操作工程机器人神经网络控制

针对在广域网环境下因较大网络时延造成遥操作工程机器人系统操作性能下降甚至系统不稳定的问题,提出一种神经网络控制方法。借助于广域网模拟器,在局域网环境下进行了不同网络时延下的位置阶跃响应和稳态跟踪实验研究。结果表明:与常规PID控制方法相比,该方法具有更好的动态和稳态特性,对网络时延具有较好的适应性和鲁棒性。研究结果对提高广域网环境下的遥操作工程机器人系统的操作性能具有指导意义。     

青菜冲中磷矿压的分析与控制

对开阳磷矿马路坪矿段延伸开采工程中采用新型锚杆护顶房柱法出现的地压显现问题进行了详细的分析 ,并提出了地压控制措施。     

AN ALTERNATIVE PERSPECTIVE ON FUZZY SET-BASED APPROXIMATE REASONING

Abstract

On the subject of fuzzy set-based approximate reasoning, this paper attempts to present a perspective that is both rigorously stated and different from the standard approach as stated by Mamdani and many others. Functionally speaking, this alternative perspective produces results essentially the same as the standard one, and in fact we intend to prove that subject to certain assumptions the results will be exactly die same. We feel however that the alternative perspective offers advantages in that it makes a more appropriate and more understandable use of such concepts as fuzzy relations, the extension principle, and fuzzy composition. If indeed it can lead to a clearer and more widespread understanding of the approximate reasoning formalism then this could conceivably spark broader interest in fuzzy control and other applications.     

On the sensitivity of the linear state regulator†

The sensitivity of the optimal response of a linear system with quadratic performance index to changes in the weighting factors in the performance index is determined. This necessitates finding the sensitivity of the feedback gain matrix K to changes in the weighting factors. It is shown that the sensitivities of K can be obtained as the solution of a set of linear matrix differential equations. Further, for time-invariant systems and an infinite time interval, it is seen that the sensitivities of K are found more simply by solving a set of linear algebraic matrix equations.     

The transition probability density function of the low-pass filtered random telegraph signal†

The transition probability density function p(y/y₀) of the output y(t) of an RC filter driven by the random telegraph signal is derived. The results extend the previous work of Wonham (1959) who treated the special case y_o = 0. An alternate method of solution to Wonham's procedure is given whereby the transition density is obtained from the solution of a set of Fokker-Planck-Kolmogorov equations.     

首钢长钢H型钢堆垛床自动控制系统介绍

介绍了基于PLC自动化型钢堆垛控制系统的组成、网络配置、工艺流程以及人机界面;着重讨论吊车和堆垛台架的位置检测、定位,变频器的应用以及堆垛吊车磁铁的自动给磁与失磁控制。利用变频器替代电磁技术,结构简单,稳定高效。     

On rotations and translations with application to robot manipulators

Robot motion is described by a set of positions and orientations of the robot's end-effector relative to some base coordinate system. Different methods to describe this motion are available and most of them are presented in this paper. Methods for position vector, free vector, and line vector transformation are presented and compared, and the advantages and disadvantages, the simplicity, and the number of arithmetic operations required of the different methods are addressed. An example of the application of these methods to a six degree-of-freedom robot is given.     

组合转子同步电机稳定性探讨

组合转子同步电机由轴向叠片各向异性(ALA)磁阻段和面贴式永磁(SPM)段组合而成,磁路各自独立.为研究组合转子电机在开环V/f控制方式下的稳定性,采用小信号分析方法,探讨无惯性阻尼器和附加机械惯性阻尼器的组合式转子电机SPM段占转子全长之比k与电机稳定性的关系.研究结果表明,无惯性阻尼器的组合式转子电机,k值增大,稳定频率范围扩宽不明显;附加惯性阻尼器,选择合适的惯量盘惯量,调节阻尼器的粘性阻尼系数能明显扩宽稳定频率范围,且k和惯量盘惯量越大,阻尼器的粘性阻尼系数调节范围越宽,电机的稳定性越好.