城市能源系统改造模拟方法：泰恩河畔纽卡斯尔的当前实践和未来挑战

文章回顾了英国的碳减排议程和当前地方在构建城市能源模型方面的实践与挑战,提出了技术与社会系统相互作用下的模型研究与定量理解中存在的一些缺陷。文章还梳理了对家居行为和能源需求已有的模型方法,以便将研究重点（反弹效应和需求侧管理）以及研究采用的行为模型的基本原理纳入整体研究框架。该模型模拟和量化了技术系统的改造和家居行为之间相互作用中的两个突出部分——反弹效应和需求侧管理。利用这一模型,文章详细阐释了对泰恩河畔纽卡斯尔200套社会住宅的案例研究,研究结果对于旧城改造的规划决策系统建设具有重要的理论与现实意义。     

复合土钉墙现场测试及数值模拟分析研究

整理分析了济南西部新城某地下车库基坑的复合土钉墙支护结构现场监测数据,采用有限元软件ABAQUS建立基坑支护结构单元三维模型,模拟了其开挖支护施工过程,动态分析基坑边坡坡顶地表水平位移、沉降变化规律,并与现场监测值进行对比,分析了微型桩与止水帷幕对复合土钉墙的影响。表明由土钉、止水帷幕、微型桩、预应力锚杆与土体相互作用的有限元力学模型能较好模拟复合土钉墙支护施工过程,结果可供同类复合土钉墙设计施工提供参考。     

三角网模型叠加法在土方计算中的应用探讨

介绍了依托AutoCAD平台计算不规则设计面土方量的方法,并提出通过对开挖前后2次观测数据分别建模并相互叠加来找出填挖线的技巧.     

Teaching construction project management with BIM support: Experience and lessons learned

This paper presents experiences and lessons learned during the introduction of Building Information Models (BIM) in construction engineering project management courses. We illustratively show that the introduction of BIM-based project management tools helped the teachers of two courses to develop more realistic project-based class assignments that supported students with learning how to apply different formal project management methods to real-world project management problems. In particular, we show that the introduction of BIM allows educators to design a class project that allowed the use of more realistic cases that better simulate real-world project conditions, helped students to learn how different project management methods integrate with each other, integrate change management tasks in a class assignment, and learn how to optimize project plans.     

Filament content threshold for activated sludge bulking: artifact or reality?

An often-noted feature of activated sludge settleability is the existence of a threshold content of filamentous bacteria, below which filaments have a relatively small effect on settleability, and above which settleability is much more sensitive to filament content. This concept has historically been based on an apparent inflection point in settleability/filament content curves. However, this was demonstrated to be an artifact of data presentation on semi-logarithmic scales. Analyses of several published data sets indicated that there was little or no evidence of a threshold effect when data were presented on linear scales, particularly around the 150 mL/g sludge volume index (SVI) "threshold". Rather, there appears to be a generally continuous (and often nearly linear) relationship between filament content and SVI, suggesting that the threshold effect, as commonly perceived, is not accurate. A modified empirical model of filament content and settleability was also presented.     

基于知识的工程机械结构分析模型化方法

本讨论了如何将人们在结构分析模型化处理方面的大量经验和理论分析结果，用知识库表达出来，借此提出了一种基于知识的工程机械结构分析模型化方法。     

Improved state space model predictive fault-tolerant control for injection molding batch processes with partial actuator faults using GA optimization

A novel model predictive fault-tolerant control (MPFTC) strategy adopting genetic algorithm (GA) is proposed for batch processes under the case of disturbances and partial actuator faults. Based on the extended state space model in which the tracking error is contained, there are more degrees of freedom provided for the controller design and better control performance is obtained. In order to enhance the control performance further, the GA is introduced to optimize the relevant weighting matrices in the cost function. The effectiveness of the proposed MPFTC approach is tested on the injection velocity regulation of the injection molding process.     

基于自适应卡尔曼滤波的环境函数模型修正

为更好地评价制导工具误差,提出一种对环境函数模型修正的方法。利用机动目标跟踪理论和环境函数模型,分别建立了状态方程和观测方程,并利用机动频率自适应算法和偏差协方差自适应算法进行卡尔曼滤波,得到更精确的平台坐标系视加速度。以某型导弹为例,分别用传统环境函数模型和改进后环境函数模型对一段时间内平台坐标系各轴进行了仿真,结果表明该模型有更好的计算结果。     

模型库管理系统的开发研究

在分析智能决策支持系统（Intelligent Decision Support System,IDSS）的基础上,分析了模型库管理系统的总体结构、运行原理和关键技术实现等。结合关系数据库技术,研究模型创建显示和存储的层次化结构,并实现模型的入库存储与管理。结果表明,按层次结构实现模型的分类入库存储,易于模型存储的扩展,用层次编号创建模型目录树的方法,层次清晰。该系统具有较好的可扩充性,能为从事IDSS系统开发的技术人员提供参考。     

离散时滞切换系统异步混合H∞和无源跟踪控制

研究一类离散时滞切换系统基于异步切换下的混合H∞和无源模型参考跟踪控制问题。采用多Lyapunov函数理论并利用平均驻留时间方法,得到以线性矩阵不等式(LMIs)表示的时滞切换系统异步切换下指数稳定且具有混合H∞和无源模型参考跟踪性能的充分条件。最后,以仿真例验证所提出方法的正确性和有效性。