富水电厂机组在线监测及状态检修

介绍了在富水电厂实施状态检修管理体制的情况以及与之相关的在线监测技术。     

基于一种改进BP网络算法的水轮机组故障诊断

水轮机组状态监测与故障诊断系统,在水轮发电机组及电力系统中有着举足轻重的地位,提高水轮机组状态监测与故障诊断系统的准确性和及时性,对电力系统的安全运行具有重大意义。作者采用一种改进的BP网络算法,用于水轮机组状态监测与故障诊断系统中,试验表明,此方法改善了传统BP网络容易陷入局部最小点、网络收敛速度慢等不利因素,提高了水轮机组状态监测与故障诊断的准确性。     

森林火灾的气象卫星监测方法

森林火灾是造成森林资源破坏的重大灾害之一。作者根据近年来从事森林火灾卫星监刚的实践，结合国内外有关利用气象卫星监测林火的资料，介绍了林火卫星监测的原理、方法和实用效果。     

大坝变形自动监测仪器

混凝土大坝的变形,尤其是坝基和拱座的变形,是衡量工程安全与否的一个重要指标。变形自动监测仪器与人工测读的仪器相比,具有精度高、时间快的优点。本文参考国外资料,提出测斜仪、钻孔变位计、垂线自动监测仪等三种国内外正在试用的电子仪器。将有助于提高并改善大坝设计的经济性和安全性。     

Ultrasonic measurement of the inter-electrode gap in electrochemical machining

During the process of electrochemical machining the dependency of the inter-electrode gap with time and process parameters can be used to determine process characteristics and to define the shape of the workpiece surface relative to the tool surface. Defining process variables to map out the required gap-time function requires the use of time-consuming iterative trials. In-line monitoring of the gap would enable process control and tool to workpiece transfer characteristics to be achieved (for ideal conditions) without the requirement to generate such parameter maps. This work explores the use of ultrasound applied as a passive, non-intrusive, in-line gap measurement system for ECM. The accuracy of this technique was confirmed through correspondence between the generated gap-time and current time data and theoretical models applicable to ideal conditions. Gap measurements are also used to demonstrate and quantify the degree of departure from ideal behaviour for an In718/chloride system as the electrolyte flow rate is reduced from 16 to 4 l min⁻¹. The monitoring of the gap size has also been shown to be effective when determining shape convergence under ideal conditions, for the example case of a 2D sinusoidal profile.     

隔河岩电站进水闸位移的前馈网络预测模型

通过对清江隔河岩水电站进水闸的位移监测资料的分析，发现进水闸顶的位称过程线呈多峰型曲线，应用常规统计模型所建立的预测模型其精度不够理想，在对大坝安全监测资料进行物理推断分析的基础上，针对水电站进水闸顶位移建立了基于前馈人工神经网络模型的预测模型，对闸顶视准线的位移量的前馈人工神经网络模型预测研究表明，其精度较高，通过进一步的研究后可望推广到大坝安全监测实际中去。     

运用监控系统增强矿井防灾能力

瓦斯监测系统是煤矿瓦斯管理的重要手段。同时也可用于防治矿井胶带运输系统外因火灾，从而大大提高矿井的防灾抗灾水平。     

灰色模型在大坝变形监测与预报中的应用

建立有效实用的大坝变形监测模型,对于大坝运行意义重大。目前国内外常用统计模型和确定性模型来预报大坝变形,但精度普遍不高。作者提出一种基于不确定性模型的非等间隔灰色模型对大坝变形进行监测预报。预报过程建立在数学基础上,而且预报结果的精度能够满足工程需要。     

高层建筑外墙干挂花岗岩质量监控

结合安业大厦施工实例，介绍了高层建筑大面积干挂花岗岩的施工过程。为了确保工程一次成活达优，对实施工程质量进行全方位监控。首先确定质量监控的目的，明确专项管理组织及专项负责人，严格监理指令制度。同时针对监控的重点、难点和关键点，组织各方实现工程质量的监控。     

Semantic Transparency,Brain Monitoring and Evaluation of Hybrid Cognitive Architectures

In constructing hybrid systems, there is a need for a principled basis to determine the relative roles or functions of artificial neural network and symbolic approaches. The primary objective of the work to be reported is the construction of a conceptual and methodological framework that permits an iterative sequence in which a hybrid model predicts the basis of cognitive performance and an objective analysis of performance provides empirical data, evaluating (and thus constraining) the structure and processes of the model. In seeking a linkage between a hybrid model of cognition and human performance the concept of “semantic transparency” has been adopted, since it can be used in analyzing and describing both the chracteristics of a model of cognition and the processes underlying human performance. An overview of a specific, ”strong” hybrid architecture is presented. The characteristics of the virtual machines which compose it and the nature of their interaction are illustrated. An approach to the questions of evaluation is described based on empirical data obtained by brain monitoring of subjects during cognitive performance.