CAWS600-S型自动气象站雷击故障的分析与排除

以惠民自动气象站的一次雷击故障检修为例,介绍了CAWS600-S型自动气象站雷击故障排除流程、检修步骤和有效减少数据缺测的应急措施,并针对故障检修和备件更换过程中出现的异常情况,提出了行之有效的处理办法,以供从事自动气象站维护保障的工作人员参考。     

自动站故障个例的分析和数据处理

文章以本站2013年5月21日遭遇雷击造成部分仪器故障、观测数据缺测的事件为例,探讨了自动气象站常见故障的排除以及气象要素数据缺测时正点上传文件的处理方法,并介绍了日常数据的维护方法。     

一次新型自动气象站综合故障的处理过程

文章介绍了新型自动气象站的信号传输方式和接线图,针对昌乐自动气象站遭受雷击出现的综合故障,按图进行检修,快速找到发生故障的位置并修复。同时探讨了降低自动气象站因雷击造成损失的方法。为台站业务人员排除和检修故障提供参考。     

DZZ5新型自动站一次雷击故障的分析处理

文章针对一次DZZ5新型自动气象站遭受雷击的事故,阐述了故障现象,通过故障排除过程总结了类似故障发生时的解决方法和流程,为此类的故障处理提供参考。     

人工读取区域自动气象站存储数据的方法与技巧

区域自动气象站采集的气象数据通过GPRS无线网络进行传输,很大程度上依赖于移动基站GPRS信号。由于受信号干扰、雷击、山洪灾害等因素的影响常会导致移动基站故障,造成区域自动气象站不能正常传输数据。为了及时获取气象资料,做好气象服务,采取了人工现场读取区域自动气象站存储数据的方法与技巧。文中将华云气象科技集团公司和江苏无锡无线电科学研究所生产的两种区域自动站采集器的数据读取命令进行了区分,详细说明了采集器存储编码格式的含义,分别介绍了两种采集器内存储编码的解读方法和计算技巧。     

自动气象站雷击故障诊断与防雷措施探讨

2017年4月,通城县国家气象观测站的自动气象站遭受雷击,造成观测记录不能按时上传。文章通过对故障进行认真的排查和诊断,确定为因雷击造成主采集器通信口(RS-232-1)损坏,同时分析了自动气象站遭受雷击原因,提出了改进观测场防雷接地系统、增设串口隔离器、调整自动气象站主采集箱在观测场中的安装位置等措施。     

机场自动气象站雷击故障抢修案例分析

文章以双流国际机场遭遇强雷暴袭击为例,对机场自动气象站故障的抢修过程进行了分析总结,强雷击导致双流机场东跑道自动气象站MAWS301的超声风传感器WS425,数据采集器QML201和供电单元均出现故障,最终经过抢修,所有数据恢复正常传输,有效地保障了用户对观测数据的使用。由于此次雷击造成的故障点较多,所以对抢修过程进行分析总结,将有助于机务保障工作。     

区域自动气象站运行效能统计分析

区域自动气象站网作为国家级气象观测站网的重要补充,其运行能力的高低和探测数据的完整性、及时性直接影响气象预报的准确性和决策服务的有效性。通过对闽北2014-07-01~2015-07-01全市141个区域自动站的运行情况进行统计分析,从报文传输、设备故障部件及故障维修时间统计等3个方面展开评估,结果表明通信网络故障和电源故障是影响区域自动气象站正常工作的主要原因,同时应尽力消除故障沉默时间、减小故障等待时间和故障排除时间,文章最后对区域自动气象站的故障原因进行分析总结并提出了相关解决方案。     

浅谈自动气象站可用性评估

以自动气象站的可用性为评估指标,利用中国气象局综合气象观测系统运行监控平台(ASOM)对江西省87套国家级自动气象站进行监控。从数据未到报、数据错误、报文格式错误3方面进行统计,并对影响自动气象站运行的因素进行分析。结果表明:2011年5～9月江西省自动气象站可用性统计中数据错误占47.1%,报文格式错误占26.1%,数据未到报占26.8%。从故障的分类中可以看出,雷击占故障总数的47%,因此加强自动气象站的防雷设施是提高自动气象站可用性的重要环节。     

浅谈DZZ1-2型自动气象站故障的排查

根据DZZ1-2型自动气象站的系统配置、结构特点,对自动气象站常见故障进行详细分析,并讨论对应的故障检查排除方法。在此基础上,提出日常工作中对自动气象站维护应注意的事项。实践表明,本文所讨论的DZZ1-2型自动气象站故障排除方法和日常维护注意事项具有良好的可操作性,并且高效快捷,对于自动气象观测站的保障维护具有较好的指导作用。     

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。     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.