A new monitoring system for piping systems in fossil fired power plants

A CEC-funded project has been performed to tackle the problem of producing an advanced Life Monitoring System (LMS) which would calculate the creep and fatigue damage experienced by high temperature pipework components. Four areas were identified where existing Life Monitoring System technology could be improved:

1. 1. the inclusion of creep relaxation

2. 2. the inclusion of external loads on components

3. 3. a more accurate method of calculating thermal stresses due to temperature transients

4. 4. the inclusion of high cycle fatigue terms.

The creep relaxation problem was solved using stress reduction factors in an analytical in-elastic stress calculation. The stress reduction factors were produced for a number of common geometries and materials by means of non-linear finite element analysis. External loads were catered for by producing influence coefficients from in-elastic analysis of the particular piping system and using them to calculate bending moments at critical positions on the pipework from load and displacement measurements made at the convenient points at the pipework. The thermal stress problem was solved by producing a completely new solution based on Green's Function and Fast Fourier transforms. This allowed the thermal stress in a complex component to be calculated from simple non-intrusive thermocouple measurements made on the outside of the component. The high-cycle fatigue problem was dealt with precalculating the fatigue damage associated with standard transients and adding this damage to cumulative total when a transient occurred.

The site testing provided good practical experience and showed up problems which would not otherwise have been detected.     

Restoration of masonry facades, renders and final coats in a severe climate

The restoration of relatively old masonry buildings, 1870-1920, represents about 119930 flats and offices in the 4-5 largest cities in Norway. Driving rain and a severe climate are the key factors for deterioration. The paper describes a case study at the city campus of the University of Oslo.     

进一步增强整体开放意识开创我市对外开放工作的新局面

九十年代是中国社会主义现代化建设进程的关键时期。作者从宏观角度提出了青岛市如何进一步增强整体开放意识,开创对外开放工作的设想。对我市今后更好适应我国的经济振兴和社会进步意义重大。     

Modeling of organism’s adaptive reaction to environmental changes

A multicellular organism is shown to be a community of special self-regulated cells with rigid and flexible regulating links, and a long-term adaptive trend of its system reaction to environmental changes is due to changes in the consumer gradients of groups of cells functioning against the imbalance between synthesis and decay of microstructures. __________ Translated from Kibernetika i Sistemnyi Analiz, No. 1, pp. 136–147, January–February 2008.     

Qualitative analysis of mathematical arc models using Lyapunov theory

An approach is proposed to the study of the electric arc near current zero by means of mathematical models. The approach is based on Lyapunov's stability theory and allows a qualitative analysis of the nonlinear differential equations describing the phenomenon. The main results concern the determination of the set of conditions leading to arc extinction and their dependence on the physical parameters involved. The classical Mayr and Cassie models are studied using the method, and some numerical results are given.     

250～300MW等级CFB锅炉分离回料系统简介

250~300MW等级CFB锅炉分离回料系统的组成、整体布置及结构特点。     

炉外精炼PLC系统的研制

讨论了ＰＬＣ炉外喂线精炼系统的工作原理、主要功能和软硬件设计，分析了ＦＸ２型ＰＬＣ输入输出指令重组的设计方法     

General overview of steady-state (small signal) stability in bulk electricity systems : A North American perspective

The most recent North American concepts of stability are discussed. Conditions in which problems of small disturbance stability have been encountered or have been noted to occur in North America, are then reviewed. Comments are made on small disturbance stability engendered by continuously acting, high gain, excitation systems, and this is followed by a review of analytical approaches considered pertinent to the study of this type of stability. The paper concludes with some specific examples of analysis applied to the Ontario Hydro bulk power system.     

雷达天线风洞仿真分析软件的设计与开发

为了简化雷达天线风洞仿真分析流程,以JAVA语言为基础,把雷达天线风洞仿真分析进行程序化处理,可以保持各模型计算结果的一致性,使雷达天线风洞仿真分析的工作效率提高50％以上。该程序适用于设计阶段的外流场分析。     

双机并联UPS的使用与维护

主要论述了自控系统采用UPS的必要性，以及SAUCRU PARALLEL SYSTEM(塞里克鲁并联系统)UPS在现场的具体应用。介绍了并联系统UPS的特性及其实现，现场外接旁路的设计与具体操作，以及日常维护中的问题。