空气质量自动监测系统故障的诊断及处理

在空气自动监测系统运行过程中，如何根据故障现象对监测仪器进行诊断处理，具有非常重要的意义．可以有效确保子站的正常运行，提高监测质量。     

Fault diagnosis for wind turbine planetary ring gear via a meshing resonance based filtering algorithm

Identifying the differences between the spectra or envelope spectra of a faulty signal and a healthy baseline signal is an efficient planetary gearbox local fault detection strategy. However, causes other than local faults can also generate the characteristic frequency of a ring gear fault; this may further affect the detection of a local fault. To address this issue, a new filtering algorithm based on the meshing resonance phenomenon is proposed. In detail, the raw signal is first decomposed into different frequency bands and levels. Then, a new meshing index and an MRgram are constructed to determine which bands belong to the meshing resonance frequency band. Furthermore, an optimal filter band is selected from this MRgram. Finally, the ring gear fault can be detected according to the envelope spectrum of the band-pass filtering result.     

叉车液压系统起升液压缸无力的故障树分析

以叉车液压系统起升液压缸无力这一故障为顶事件,建立了叉车起升液压缸无力故障树.并进行了定性与定量分析.应用表明,故障树分析法运用于叉车液压系统故障诊断是可行的.     

锅炉非计划停炉统计与分析

通过对锅炉非计划停炉的统计和故障分析,有针对性地采取预防措施,降低锅炉非计划停炉次数,提高锅炉安全运行的可靠性。     

双靶定向井在断块油气田开发调整中的效果分析

双靶定向井技术在开发复杂断块油气田中有其独特的作用,在油田开发中后期的增储上产中也是一种特别有效的手段。文中就近几年来双靶定向井技术在中原油田开发调整中的应用及其效果作了简要概述。中原油田几年来的实践证明：双鞍定向井钻遇油层厚度比直井多１／４,钻穿同一油层厚度比井多一倍,投产后的产油量比直井多１￣２倍,钻井成本比直井增加１０％￣２０％。中原油田目前双靶定向井的平均井深３０４９ｍ,最大井深３５００ｍ     

Proton exchange membrane fuel cell system diagnosis based on the multivariate statistical method

Although electric-powered vehicles have developed rapidly in recent years, with significant progress in the lithium power battery industry, the Fuel Cell Electric Vehicle (FCEV) is still a competitive choice for a clean transportation solution, because of its extended driving range, zero emissions, and fast fuel recharging capability. In particular the fuel cell hybrid bus used for city traffic is the FCEV type most likely to be commercialized. Demonstration programs for a fuel cell bus fleet have been operated for a few years in China. It is necessary to develop comprehensive diagnostic tools to increase the reliability of these systems, because fuel cell city buses serve large numbers of passengers using public transportation. This paper presents a diagnostic analysis and implementation study based on the Principal Component Analysis (PCA) method for the fuel cell system. This diagnostic system was successfully implemented for detecting a fuel cell stack sensor network failure in the fuel cell bus fleet at the Shanghai Expo in 2010.     

A roadmap towards intelligent net zero- and positive-energy buildings

Buildings nowadays are increasingly expected to meet higher and more complex performance requirements: they should be sustainable; use zero-net energy; foster a healthy and comfortable environment for the occupants; be grid-friendly, yet economical to build and maintain. The essential ingredients for the successful development and operation of net zero- and positive-energy buildings (NZEB/PEB) are: thermal simulation models, that are accurate representations of the building and its subsystems; sensors, actuators, and user interfaces to facilitate communication between the physical and simulation layers; and finally, integrated control and optimization tools of sufficient generality that using the sensor inputs and the thermal models can take intelligent decisions, in almost real-time, regarding the operation of the building and its subsystems. To this end the aim of the present paper is to present a review on the technological developments in each of the essential ingredients that may support the future integration of successful NZEB/PEB, i.e. accurate simulation models, sensors and actuators and last but not least the building optimization and control. The integration of the user is an integral part in the dynamic behavior of the system, and this role has to be taken into account. Future prospects and research trends are discussed.     

垦利油田复杂断块油藏断层封堵性研究

垦利油田是一典型的多断块油藏,断层对该区的油水分布有很强的控制作用.在构造研究的基础上,利用三维地震解释资料,通过精细储层研究,对该区构造格架进行了重新解释,深化了对注水开发起遮挡作用的断裂体系的认识,大幅度提高了构造格架模型的精度.并且从两盘接触关系,两盘产出及压力变化情况、井间注入与产出、产同与产出的干扰状况判断断层的封堵性,对剩余油研究及下步挖潜提供了较为可靠的依据.     

油罐火灾爆炸故障树分析

油罐火灾爆炸主要由点火源和油气泄漏造成的。文章应用故障树分析法(FTA)对点火源和油气泄漏的基本原因进行分析，建立了油罐火灾爆炸故障树。采用布尔代数化简法求出系统的最小径集，给出了故障树顶上事件发生概率和基本事件的三种重要度分析。通过对系统的故障树分析，定性和定量地探讨了引起油罐火灾爆炸的主要原因，提出了相应的改进措施。油罐火灾爆炸故障树分析的结果可为已建油罐的管理、维修和新建油罐的设计提供理论指导。