应用模糊综合评判模型评价历史街区保护的研究

与传统方法相比,应用模糊综合评判模型对城市历史街区保护现状和影响进行评价,不仅能解决定性和定量指标难统一的问题,还能融合空间数据的定位特点,真实、有效地反映历史街区的保护状况,为城市历史文化遗产保护规划决策提供科学依据.     

PMIG焊焊接电弧电压的模糊控制

模糊控制是一种新型智能控制方法。本文介绍作者拟对脉冲熔化极气体保护焊(PMIG焊)焊接过程中的电弧电压参数进行模糊控制,取得了良好的焊接电弧稳定性和焊缝成形的效果。     

A RISK-BASED CONSENTING TOOL FOR SETTING SUSTAINABLE DISCHARGE CONSENTS

This paper describes the development of a guidance tool for assessing the ability of a receiving watercourse to assimilate pollution from point discharges. The 'sustainable capacity tool'uses a framework that accounts for the 'no-deterioration'requirement of the Water Framework. Directive, in terms of the downgrading of a river-stretch classification and the requirement to return all rivers to 'good ecological status'. The second requirement results in a long-term set of river-quality targets or objectives, and it is generally assumed that 'good'refers to 'A2 quality in the Scottish Environmental Protection Agency classification system. The resulting sustainable capacity is defined as the risk-based amount of capacity that could be allocated without causing a failure of the target class and which could also result in a negative capacity if the river stretch is currently failing the target class. This is plotted as a GIS layer and is intended to form an overview of water quality to help inform stakeholders who are participating in a water-quality strategy for the next Scottish investment programme on Quality and Standards 3. The sustainable capacity tool could be used in conjunction with integrated catchment modelling for complete management of the Water Framework Directive river-basin districts.     

System reliability analysis for mixed uncertain variables

Uncertainties in a physical system should be modeled accurately to obtain an accurate estimate of its safety. Based on the amount and type of information available, either probability theory or possibility theory can be used. In probability theory variation in the parameters is modeled using probability density functions and in possibility theory it is modeled using fuzzy membership functions. But when dealing with a combination of both probability distributions and fuzzy membership functions, the computational cost involved in estimating the bounds of reliability increases exponentially because one reliability analysis, which is a computationally expensive procedure, is performed at each possibility level. Moreover, the failure of structural systems is governed by multiple limit-state functions, all of which are to be taken into consideration for determining its safety. These limit-state functions are often correlated and the accuracy of the estimated system reliability is dependent on the ability to model the joint failure surface. To reduce the computational cost involved without loss of accuracy, high quality function approximations for each of the limit-states and the joint failure surface are developed in this paper. Numerical examples are presented to demonstrate the efficiency and accuracy of the proposed methodology.     

Fuzzy critical chain method for project scheduling under resource constraints and uncertainty

This paper develops a fuzzy critical chain method for project scheduling under resource constraints and uncertainty. The method consists of developing a desirable deterministic schedule under resource constraints, and adding a project buffer (PB) to the end of the schedule to deal with uncertainty. The size of the project buffer is determined by computations with fuzzy numbers. During project execution, the proposed method focuses on the penetration level in the project buffer, and dynamically updates the schedule to provide a more accurate schedule for actual progress. The use of a project buffer makes the method akin to critical chain project management (CCPM), although no feeding buffers are used. The proposed method is useful for both project planning and execution.     

控制技术及模糊控制在冲天炉熔炼中的应用

介绍了国内外冲天炉熔炼控制技术的发展状况。在分析国内铸造业具体情况后，提出了采用人工智能控制技术中的模糊控制理论对冲天炉熔炼控制的可行性和发展方向。     

智能家居系统核心技术探讨

本文从技术与应用的角度全面阐述智能家居系统的现状和发展前景,深入分析了其核心技术——通讯网络架构和控制器,并提出个人的技术观点和建议。     

城市隔震高架桥梁地震反应的半主动控制

研究应用磁流变(MR)阻尼器对隔震连续梁桥邻联相对位移的半主动控制,并采用离线优化与在线自调整相结合进行模糊控制(FLC)。以邻联最大相对位移最小化为目标函数,对基本模糊控制器的隶属函数、量化因子、比例因子进行离线遗传优化;对优化后的模糊控制器的量化因子和比例因子进行在线自调整;数值仿真分析一多跨隔震连续梁桥的简化四自由度体系的半主动控制,比较不同控制方案的控制效果。结果表明,将MR阻尼器安装在上部结构与桥墩之间对桥梁邻联相对位移的控制效果优于将其安装在邻联之间;半主动控制能同时有效控制邻联最大相对位移与支座变形;与普通模糊控制以及仅采用遗传优化的模糊控制相比,具有在线自调整功能的模糊控制具有更好的控制效果和鲁棒性。     

国际工程投标风险的模糊决策综合评判

结合模糊评价和模糊决策分析方法,构建模糊决策综合评判模型,对工程项目进行风险评价,为国际工程项目风险管理提供一种客观实用的分析方法。     

自学习模糊滑模控制及其在电液伺服系统中的应用

本文针对一类非线性系统的跟踪控制问题,基于滑模等价控制的基本概念,提出了一种具有在线学习能力的模糊滑模控制方法,利用学习控制实现模糊控制规则的动态更新,使得模糊控制的输出逐步逼近滑模等价控制,最终实现渐近稳定的滑模控制。