基于Zigbee技术的煤矿井下监控系统

针对当前煤矿井下远程监控系统存在的监控盲区和扩展困难的问题,提出了一套设计方案。该方案利用Zigbee技术组网方便,可扩展性强,容错性好,功耗小的特性,以低功耗的CC2530射频模块为核心,以CC2591芯片作为射频前端设计了基于无线传感器的煤矿井下远程监控系统,该系统采用无线通讯和RS485总线相结合的方式将数据传送到地面的监控中心,使得煤矿井下的远程在线监控成为可能,对矿山的安全具有十分重要的意义。     

基于MHHO-BP算法的DC-DC电路软故障诊断

针对DC-DC电路软故障诊断中特征提取困难和分类准确率低的问题,提出了一种基于多策略改进哈里斯优化算法-反向传播MHHO-BP)神经网络的故障诊断方法。该方法通过VMD对故障信号进行处理,提取其时域和频域特征作为故障向量,采用MHHO算法优化BP神经网络的权值和阈值,建立DC-DC电路的VMD-MHHO-BP软故障诊断模型。实验结果表明,对于DC-DC电路软故障,该方法相较于鲸鱼优化算法(WOA)和蝴蝶优化算法(BOA)优化BP神经网络,其诊断效果好,准确率高。     

Research on the sensitivity for the coal mine gas concentration detection by laser spectrum absorption

Because of the former gas chemistry examination method defects, tunable diode laser absorption spectrum technology （TDLAS） was used. It used an isolated absorption spectrum of the gas molecule to measure the gas absorption spectrum in order to distinguish the gas conveniently. The second harmonic （20 was measured in this system. Due to the fact which the harmonious signal is proportional to the concentration of the absorption gas, the gas concentration may be obtained through examining harmonious signal. The theoretical analysis and the experimental result indicate that under the same level of pressure, survey with the signal-to-noise ratio（SNR） of 2fsignal increases the accuracy by one order of magnitude and may reach 10 ^-3 and the sensitivity may reach the 10^-6 level compared to that of direct absorption. 5% methane density and a 30 cm absorption cell were used in the experiment. It has several advantages including high sensitivity, best resolution, and faster response and so on. The gas concentration monitoring of coal mine may be accomplished.     

利用C51开发单片机应用系统中几种延时方法的研究

介绍了单片机的软件开发工具C51的延时程序的设计特点及不同方法，并结合自己的体会和经验用实例加以说明。     

煤矿井下电缆隧道超温预警与故障定位系统

针对煤矿井下电缆隧道中电缆故障时温度上升及电流、电压发生变化的情况,设计了以32位ARM芯片LPC2292为核心控制器,对电流、电压进行检测,同时采用数字温度传感器进行温度检测,外扩显示、通讯模块的煤矿井下电缆隧道超温预警与故障定位系统。文中介绍了系统的硬件技术方案,软件的编写上以源码开放的μ/COS-II实时操作系统作为软件平台,划分了具体的任务等级。该系统的实施,能够实现电缆在线故障定位,有效地保证煤矿的安全生产。