综采工作面智能定位喷雾除尘控制系统的应用与研究

介绍了一种综采工作面自动喷雾降尘的新方法,阐述了综采工作面智能定位喷雾除尘控制系统的基本原理、安装、使用及维护。该系统通过采煤机上搭载的红外发射器和支架上安装的红外接收传感器实现采煤机的定位功能,通过安装在支架上的电磁阀控制喷雾,消除处于采煤机切割滚筒下风方向的粉尘,实现了综采工作面的自动灭尘。     

煤矿综采工作面喷雾降尘系统研究

为有效改善综采工作面井下工人劳动环境,提高生产安全性,设计煤矿综采工作面喷雾降尘控制系统。该系统包括喷雾主控制器、喷雾分控制器以及上位机监控系统,由CAN总线通信完成数据、控制指令的交互,其喷雾分控制器周期性采集的传感器数据并作为控制喷雾降尘系统的核心数据依据。经现场实际使用发现:该喷雾降尘控制系统能够有效降低综采工作面粉尘浓度,降尘率达40%以上,有效改善工人劳动环境,保障工人身心健康。     

采煤机截割部喷雾降尘装置的设计与分析

为解决采煤机截割部喷雾降尘装置现存的自动化程度偏低、喷雾状态较单一等问题,基于采煤机截割部喷雾降尘装置现存的不足,以PLC控制器作为控制核心,借助压力传感器监测控制水管压力,并通过增设点喷状态以及全喷状态,来提高喷雾降尘效果.经实际应用结果表明,改进后的喷雾降尘装置应用效果良好,可显著降低采煤工作面各作业点粉尘浓度.     

采煤机机载式喷雾控降尘装置优化研究

矿山粉尘一直是污染作业环境、造成粉尘爆炸的危害因素之一。以永定庄矿8106综采工作面采煤机为例,提出了一种机载式喷雾控降尘装置优化方法,对顺风喷雾布置和装置结构进行综合优化改进,使得工作面采煤机司机附近粉尘浓度降到3.0%以下,控降尘效率达到了80%以上,效果显著。     

综采工作面采煤降尘系统应用分析

综采工作面在回采期间存在粉尘浓度大、能见度低等技术难题,山西煤炭进出口集团左云长春兴煤业有限公司综采队通过技术研究,为采煤机、液压支架安装了一套自动喷雾降尘系统。通过在303工作面实际应用效果来看,采用自动喷雾降尘系统降尘后工作面粉尘质量浓度由原来的270 mg/m~3降低为40 mg/m~3,降尘效率达75%以上,取得了显著的应用成效。     

综采工作面喷雾降尘装备的优化研究

针对81505综采工作面采煤机喷雾装置存在的问题,分析工作面粉尘成因及移动规律,遵循"先隔离,后降尘"的优化改造原理,提出对采煤机喷雾装置采用隔离与除尘喷嘴的交叉安装改造,并将液压支架除尘装置由手动改造成自动控制,从而对工作面粉尘进行治理。研究结果表明:采煤机滚筒出的粉尘质量浓度较原先降低56.6%,取得了很好的降尘效果。     

矿井综采工作面喷雾降尘装置的设计及应用分析

针对晋能控股煤业集团某矿31016工作面粉尘浓度大,采用普通喷雾降尘装置不能及时高效地降低工作面粉尘的问题,设计出一种新型喷雾降尘装置。该装置主要是通过让液压支架风力负压喷雾降尘与采煤机湿式喷雾降尘相结合来有效降低工作面粉尘。经数值模拟分析与进行现场试验,应用该种降尘方式能有效扩大喷雾范围与喷雾浓度,可显著降低工作面粉尘浓度,工作面粉尘平均降尘率可达到85%,达到了较好的降尘效果。     

采煤机喷雾系统雾化效果的优化

为进一步提升采煤机喷雾系统对工作面粉尘、煤尘的降尘效果,在对采煤机喷雾系统降尘机理和方式研究的基础上,重点从提升喷雾系统雾化效果的角度出发对喷嘴结构尺寸进行优化,主要对喷嘴口径、喷嘴内腔直径、旋流角以及针阀的布置位置四项参数进行优化,并对不同参数下对应的雾滴的扩散角和内部流场速度进行对比,最终达到提升雾化效果和降尘效率的目的 .     

采煤机尘源跟踪高压喷雾降尘技术及装备的分析与应用

针对当前采煤机在降尘过程中存在的问题,在对综放工作面粉尘产生特征进行分析的基础上提出了采煤机尘源跟踪高压喷雾降尘技术及装备的应用方案,对该高压喷雾降尘系统的基本原理、组成及其特点进行了分析,将该系统应用在店上煤业工作面的开采中进行了现场实测,实践结果表明系统可以有效地降低采煤机割煤时的粉尘浓度,解决工作面粉尘污染问题。     

矿井综采工作面高效喷雾降尘装置设计研究

为降低粉尘对矿井生产和职工生命安全的影响,基于雾滴捕集尘粒作用机理,设计了一种高效喷雾降尘系统装置,并对比分析装置安装前后综采面的粉尘浓度。结果表明：采用该喷雾除尘装置后,各测点降尘率明显大幅提升,且在采煤机司机、移架工位置的呼尘、全尘降尘率分别是89.6%、89.4%和89.1%、90.1%,表明该综采工作面原粉尘浓度最高的割煤、移架位置处的粉尘得到有效抑制。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...