联合动力实验台远程监控与故障诊断系统开发

针对联合动力装置实验台结构复杂、故障原因多样的特点,提出了一种以虚拟仪器为开发平台,结合先进智能诊断算法的远程状态监视与故障诊断系统。在分析虚拟仪器应用特点的基础上,详细阐述了系统远程状态监视、故障诊断以及故障信息管理的设计方案。该系统在提高机组安全运行,实现重大故障快速响应与处理的同时,大幅度降低维修费用,具有重要的应用价值。     

铁路机车故障诊断及预警系统的研究

针对铁路机车故障监测体系不完善、故障自动诊断局限性大、无法进行远程联网诊断的不足,提出了一种新的铁路机车故障诊断及预警系统。该系统通过建立的故障专家判别库和无线数据通信系统可实现对铁路机车运行状态的智能检测和故障预警。根据实践应用表明,该故障诊断及预警系统能够实现机车运行故障的在线远程监测和分析,能够将机车运行故障率降低93.1%,显著提升了铁路机车的运行稳定性和安全性。     

W77E58单片机电梯故障状态监控设计

电梯远程监控技术近年来取得了长足发展，远程监控系统通过电话线或专用线路，由设在电梯维修服务中心的计算机对分布在各地的电梯进行远程监视和操作，对故障和运行状态进行监测统计等。监控系统主要由计算机监控中心和现场实时采集装置构成，前端机主要负责在电梯控制系统中进行数据采集。当电梯发生故障时，前端机接收故障状态信号并判断得出故障类型，把故障类型和故障时的运行状态等信息传给服务中心计算机；电梯正常运行时，前端机采集的信号不主动上传给服务器，服务器可主动拨号接通前端机，查询电梯的运行状态。     

变电站二次设备远程运维研究与应用

研究了变电站二次设备远程运维系统,根据电网运行特点,分别定位运行端、检修端和调度端远程运维功能需求,通过综合运用变电站二次设备远程监控、智能诊断、远程检修、信息报送等技术,实现二次设备状态在运维站内可远程监控,在检修端实现智能诊断与快速远程抢修,在调度端提供智能分析与辅助决策功能,从而保障二次设备的健康水平,提高设备运维管控工作效率及电网故障处理能力。     

DCS远程诊断支持系统的研究与实现

近年来,随着电力行业对经济环保运行的要求越来越高,机组的装机容量越来越大,生产过程越来越复杂,机组对分散控制系统(DCS)的依赖程度也越来越高。当运行机组出现一些复杂或紧急故障时,用户往往需要求助于DCS厂家进行故障分析和处理。然而由于距离的限制,降低了故障处理的时效性和经济性,无法很好地保障机组的稳定运行。DCS远程诊断支持系统可以实现对火电、水电、风电、化工及其它各系统的远程诊断及技术支持功能,使现场的实时运行状态能够快速远传至DCS厂家,从而使用户能够得到快捷准确的远程技术支持。本文设计了"VPN组建方式"的远程诊断支持系统,并进行了深入研究、功能扩展、应用设计及平台管理。     

基于云平台的远程机泵监控诊断系统设计与实现

为了提升机泵运行的安全性、可靠性,研究了基于云平台和运行大数据的设备健康状态监测诊断模式,设计了远程在线监测与智能诊断系统,实现了集在线监测、远程监控、远程诊断、故障匹配识别于一体的智能高效监测诊断模式。实际应用表明,该系统实现了远程监控的目的,能够较好地接收和传输状态信息数据,可以满足远程实时监控的需求,并为后续进行设备故障诊断和分析提供依据。     

直流机车状态远程监测诊断控制系统研制

本文基于单片机技术,开发直流机车状态远程监测诊断控制系统,通过采集的数据精确的判断和分析出故障电路的范围,杜绝因无法复现动态故障而造成机车带病上线运行。远程诊断实现车地互动,为维修人员处理动态故障提供准确的数据参考,对机务行车安全保障提供新的技术手段。     

基于数据驱动的设备故障诊断技术

针对复杂设备故障快速诊断需求,在开展数控系统内部变量和过程状态数据采集与处理基础上,开发了设备在线维护管理功能模块,对提升设备运行状态在线监控水平和设备故障快速诊断能力具有一定的实际意义.     

基于PLC的远程设备故障诊断方法研究

随着计算机技术的不断升级和发展,设备制造企业对于PLC的远程设备故障诊断方法要求也越来越高。近年来,PLC发展极为迅速,也被广泛运用到各类产品中,是集远程监测、控制、诊断等通信技术为一体的通用工业控制装置。计算机网络技术的发展使基于PLC的远程设备故障诊断成为可能,并改变了传统设备监控、故障诊断方法,通过网络将各类数据传递给远程专家系统,实现了通过网络监控设备的运行状态、故障发生情况。本文将简单介绍基于PLC的远程设备故障诊断方法,长期为大型设备的远程故障诊断技术提供参考。     

机械设备磨损状态的远程监测诊断系统研究

本文结合铁谱技术和网络技术，建立机械设备磨损状态远程监测诊断中心，提出了基于油液分析的机械设备磨损状态远程监测诊断系统的体系结构及其运行模式。分析探讨了系统中使用的关键技术，机械设备磨损状态远程监测诊断系统降低了企业实施油液分析的技术要求，充分利用了专家的专业知识，实现了异地数据共享、协同诊断，提高了磨损状态监测诊断的准确性。     

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...     

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。     

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...     

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.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

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...