提高8号煤矿许用毫秒雷管可燃气安全度方法探析

通过大量的试验和理论分析,找出了影响8号煤矿许用毫秒延期电雷管可燃气安全度的原因,并制定了提高可燃气安全的措施。     

拼装玩具中一连接件注射模的设计

根据某拼装玩具中一连接件的工艺特点,阐述了该连接件注射模的结构设计和模具工作过程。注射模采用滑块斜导柱侧向分型机构、齿条和各级齿轮传动脱螺纹抽芯机构完成塑件成型,并利用定距拉板完成二次分型,刮下产品b,再利用推杆推出产品a,顺利开模;合模时,则采用螺钉和压缩弹簧保证斜导柱准确地进入滑块的斜孔中。经批量生产验证,该模具结构紧凑,工作可靠,运转平稳,生产的塑件能满足要求。     

Static group synchronization of second-order multi-agent systems via pinning control

This paper investigates the expected static group synchronization problem of the second-order multi-agent systems via pinning control. For directed communication topology with spanning tree, based on Gershgorin disk theorem and the matrix property, a static pinning control protocol with fixed gains is first introduced and some sufficient and necessary static group synchronization criteria are also established. It is worth mentioning that a rigorous proof is also given that only one pinning node is needed to guarantee static group synchronization, which could be inferred that our protocol might be more economical and effective in large scale of multi-agent systems. Then, for weakly connected directed communication topology with nodes of zero in-degree, an adaptive pinning control applied to the node with zero in-degree is also proposed to achieve static group synchronization. Finally, the efficiency of the proposed protocols is verified by two simulation examples.     

Model free adaptive iterative learning control for a class of nonlinear systems with randomly varying iteration lengths

This paper proposes a novel model free adaptive iterative learning control scheme for a class of unknown nonlinear systems with randomly varying iteration lengths. By applying the dynamic linearization technique along the iteration axis, such systems can be transformed into iteration-depended time varying linear systems. Then, an improved model free adaptive iterative learning control scheme can be constructed only using input and output data of the system. From the rigorous theoretical analysis, it is shown that the mathematical expectation of tracking errors converge to zero as iteration increases. This design does not require any dynamic information of the ILC systems and prior information of randomly varying iteration lengths. An illustrative example verifies the effectiveness of the proposed design.     

A cyclic pursuit framework for networked mobile agents based on vector field approach

This paper proposes a pursuit formation control scheme for a network of double-integrator mobile agents based on a vector field approach. In a leaderless architecture, each agent pursues another one via a cyclic topology to achieve a regular polygon formation. On the other hand, the agents are exposed to a rotational vector field such that they rotate around the vector field centroid, while they keep the regular polygon formation. The main problem of existing approaches in the literature for cyclic pursuit of double-integrator multiagent systems is that under those approaches, the swarm angular velocity and centroid are not controllable based on missions and agents capabilities. However, by employing the proposed vector field approach in this paper, while keeping a regular polygon formation, the swarm angular velocity and centroid can be determined arbitrary. The obtained results can be extended to achieve elliptical formations with cyclic pursuit as well. Simulation results for a team of eight mobile agents verify the accuracy of the proposed control scheme.     

均匀带电圆盘近轴区域的电场

对于均匀带电圆盘(以下简称圆盘)在轴线上激发的电势和电场强度,许多文章都做了讨论,并得出简洁的计算式.但是轴线以外区域的电场(电势)如何计算未见讨论.本文以场叠加原理为基础,借助数学展开的办法对这一问题作一些定量研究.     

实验探究锥形POF的光功率的传输特性

通过实验研究了锥形聚合物光纤(POF)输出端光场强度分布呈现中心强、周边弱的模式分布特征,无论激光从大端输入、小端输出还是从小端输入、大端输出,都观察到小端的高阶模相对光强度明显低于大端,证明了锥形POF可以使大芯径POF和小芯径石英光纤的过渡连接得到良好的匹配.分别以大小端作为输入端口,研究了圆锥角度以及耦合长度对过渡器的光功率传输效率的影响,得出了POF过渡器最佳圆锥角度.yh     

基于双CPU结构的数据采集控制系统设计

提出了一种基于USB的便携式数据采集与控制系统设计方案。从USB数据采集控制器硬件及电路设计、USB固件开发、驱动程庭设计以及数据采集程序设计等方面介绍了数据采集控制系统软硬件的设计和实现。该系统采用双CPU结构,一个CPU负责进行数据的采集、滤波、计算等,另一个CPU作为总线接口实现与PC机的通讯。以此为核心设计的数据采集控制系统。具有测试精度高、可靠性好,使用方便、通用性强等优点。可用于各种场合的实时数据采集与控制。     

基于OBE理念的电气工程专业应用型课程体系建设与教学实施改革

坚持需求导向,坚持OBE理念,坚持具有时代特色的课程观、教学观,针对当前课程体系建设存在的不足,统筹考虑课程体系、课程内容、课程资源、教学团队、教学方法、课程评价等要素。在探索实施过程中,邵阳学院电气工程及其自动化专业改革取得了初步成效,电气工程专业应用型课程体系得到构建,应用型人才培养的质量得到提高。     

LOGO!在教学楼电气系统控制中的应用

本文介绍了采用LOGO!代替继电器开关量控制，实现对教学楼电气系统中的插座、室内照明、走廊照明及电铃电路的自动与手动控制；并通过内部软件线路图分析，阐明LOGO!在时钟开关量控制中的优势。