一种基于Kalman滤波和能量原理的实时损伤识别方法(英文)     

Xing-huai HUANG  Shirley DYKE  Zhao-dong XU 《浙江大学学报(A卷英文版)》2015,(2):105-116

目的:建立一种损伤识别方法,能够实时地监测多自由度复杂结构中构件的损伤情况。方法:1.用能量原理对结构刚度进行解构,建立结构单元刚度和节点响应之间的关系;2.用Kalman滤波原理分析结构刚度的预测值和测量值,迅速对结构的刚度进行识别(图6–9);3.对每一步计算进行耗时监测,确保算法的实时性(图10)。结论:1.该方法能够较准确地得到结构的刚度信息,同时得出损伤单元的损伤位置和损伤量;并且收敛速度快,计算量小,具有很强的实时性和抗噪能力;2.对于本文的桁架结构,所有杆件刚度均能在0.4 s内收敛,平均每一荷载步计算时间约为0.0012 s,小于采样周期1/256 s,说明该方法可以迅速、准确地对结构进行实时的监测。  相似文献   

基于Virtools与DWR技术实现虚拟实验远程监控系统     

吴晓盼  王丹红  王洪旭 《黄山学院学报》2011,13(5):39-43

利用虚拟现实工具软件Virtools技术结合DWR技术实现了网络3维虚拟实验的远程监控系统,结合虚拟实验实例的开发,给出了相应的设计模型和实现步骤。  相似文献   

The battle for neutrality     

Vincent Kuitenbrouwer 《Media History》2019,25(4):400-413

Following the German invasion of the Netherlands in May 1940, a Dutch government in exile was set up in London. One of the most important activities of these exiles was to make propaganda against the Nazi’s and throughout the war they operated Radio Oranje (Radio Orange), a wireless station that broadcasted to the Netherlands using BBC-transmitters. Another part of the Dutch broadcasting outfit in England was a ‘listening service’ that made daily reports about Dutch-language radio broadcasts from Hilversum by the Nazi regime. This article draws from a complete, and previously unused, set of these monitoring reports to analyse the Dutch propaganda war in the ether. The source material reveals that notions of Dutch neutrality were central to the radio broadcasts at both sides of the North Sea. In addition, the reports show how the London broadcasters singled out and targeted specific Nazi propagandists whom they thought to be the most dangerous.  相似文献   

Strategic library and information services models for the visually impaired persons: The South African Library for the Blind perspective     

Neli Kaunda 《Journal Of Access Services》2019,16(1):34-52

The South African Library for the Blind (SALB) contributes to the quality of life of print-impaired people encouraging independence through access to information, informed decision making, and taking pleasure in the enjoyment of recreational reading. In realizing the vision, SALB implemented two strategic models; agent mini-libraries and comprehensive mini-libraries. Management and administration of the services rendered is covered in detail. The project was pioneered in one of the provinces and has been rolled out to other provinces. The paper highlights how visually impaired people experience in a tangible manner, assistive technologies, training and interaction with community members and use libraries.  相似文献   

机械压力机智能控制系统分析     

李琳娜  蒋彬 《安顺学院学报》2011,(5):129-131

论文对伺服螺旋精压机的控制系统进行了研究,在"PC+运动控制器"方案的基础之上设计分析了控制系统的硬件,GT 200-SV作为主机控制单元,交流伺服驱动器和专门设计的伺服电机作为执行元件,形成闭环控制系统。在此基础上,选择Visual C++6.0作为软件开发工具,设计控制系统软件使用了模块化和面向对象的方法。  相似文献   

任职教育中装备实践教学新体系构建与运用     

黄景德 《教学研究(河北)》2015,(2)

为使院校教育紧跟新装备高速发展形势,使新装备尽快形成战斗力,提出了以实践教学为核心,引领应用型人才培养的新思路,不断探索和实践,创建了“知识、技能、素养相融合”的三位一体课程体系,建立了“实装、模拟器、运用环境配套融合”的训练平台,构建了“学习、实践、创新相促进”的教学模式和实践教学监控机制,形成了“单机系统整体相互渗透,教学科研服务相互促进”的装备实践教学体系。在人才培养中取得显著效果,具有重大的应用和推广价值。  相似文献   

两因素情境下老年人的元认知监测     

蔡任娜 《佳木斯教育学院学报》2015,(5)

元认知水平对个体的认知功能具有重要意义。研究采用"学习—判断—测试"的实验范式,探讨老年人在两因素情境下的元认知监测水平,结果发现与青年人相比,老年人的学习判断准确性不存在下降。表明老年人的元认知监测能力仍保持完好。  相似文献   

淮南市3~6岁幼儿各项身体形态分析     

李鹏程 《淮南师范学院学报》2015,(3)

为全面了解淮南市幼儿的形态指标、身体素质现状,2010年淮南师范学院与淮南市体育局共同组织了对淮南市幼儿的调查与测试,把测得数据采用《国民体质测定标准手册》中幼儿部分的评定方法与标准进行统计处理。结果表明：淮南市3~6岁幼儿身体形态发育随着年龄的增加,他们的身高与体重值均增加,呈逐年升高趋向;男性幼儿和女性幼儿的身体形态从3岁就呈现出差异,这主要是由遗传决定的,这种差异在7岁以后,伴随着年龄的增长表现更为明显。  相似文献   

Longitudinal analysis of the environmental attitudes of university students     

Kerry Shephard  John Harraway  Tim Jowett  Brent Lovelock  Sheila Skeaff  Liz Slooten 《Environmental Education Research》2015,21(6):805-820

This article addresses the important questions that higher education institutions ask concerning their impact on their students’ sustainability-related attributes ‘How do our students’ worldviews change as they experience higher education with us?’ The process of monitoring such a dynamic entity is fraught with statistical complexity but may not be impossible for an institution willing to ask whether or not its educational efforts in ‘education for sustainability’, ‘education for sustainable development’ or ‘environmental education’, and campus sustainability developments, are paralleled by changes in the attitudes of its students. We describe here a longitudinal survey process based on the revised New Ecological Paradigm scale, with two cohorts of students, in three programmes of study, operating over four years, with multiple survey inputs by each student. We implemented the longitudinal analysis using a linear mixed-effects model and describe here the development and testing of this model. We conclude that higher education institutions can benchmark the sustainability attributes of their students and monitor changes, if they are minded to. We invite higher education practitioners worldwide to join us in further developing suitable research instruments, processes and statistical models, and in further analysing the assumptions that link higher education to sustainability and to global citizenship.  相似文献   

边坡地质灾害自动化监测探讨     

欧树召  黄加旭  李建龙 《淮南职业技术学院学报》2015,(1):10-13

为实现边坡安全监测的自动化,采用GT-MCU32型综合数据自动采集系统,通过GPRS或者CDMA无线网络进行数据传输,软件自动对测量数据进行换算,直接输出监测点位移量,完成对传感器数据的采集和监控;以滑坡/崩塌地质灾害的自动化监测为例,分析监测原理及监测方法,说明实行自动化监测的重要意义。  相似文献